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JP4186103B2 - Goods transport box - Google Patents
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JP4186103B2 - Goods transport box - Google Patents

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JP4186103B2
JP4186103B2 JP2002326691A JP2002326691A JP4186103B2 JP 4186103 B2 JP4186103 B2 JP 4186103B2 JP 2002326691 A JP2002326691 A JP 2002326691A JP 2002326691 A JP2002326691 A JP 2002326691A JP 4186103 B2 JP4186103 B2 JP 4186103B2
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貴峰 松岡
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Daiichi Ohmiya Co Ltd
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Description

【０００１】
【発明が属する技術分野】
本発明は、発泡ポリプロピレン樹脂板で形成され、主として物品搬送用として使用される物品搬送用箱に関する。
【０００２】
【従来の技術】
従来の物品搬送用箱として紙段ボール製またはポリプロピレン段ボール製の箱形成素材を組み立てて形成する物品搬送用箱が知られている。前記物品搬送用箱に要求される機能は、収容される被搬送物が損傷しないこと、被搬送物が汚染されないことであり、物品搬送用箱を繰り返して使用できるように物品搬送用箱自体の耐候性、耐久性及び衛生的使用性などの機能も要求される。ところが、前記紙段ボール製やポリプロピレン段ボール製の物品搬送用箱では、箱形成素材が柔らかいため、物品搬送用箱の側壁や底面が湾曲する問題がある。例えば被搬送物を収容して持ち上げた場合や搬送中に側壁や底面が湾曲し、被搬送物の間や被搬送物と物品搬送用箱の間に間隙が生じて被搬送物が動いて擦れ合ったり、間隙に被搬送物が倒れ込むことにより被搬送物に損傷が発生する。また、側壁や底部の湾曲によって蓋部との隙間が生じ、そこから塵芥が侵入して被搬送物が汚染される。
【０００３】
本発明者は前記問題を解決すべく低発泡ポリプロピレン樹脂板を箱形成素材とする物品搬送用箱を発明しており、その特徴は以下の通りである（特願２００２−２０５１１５号参照）。
低発泡ポリプロピレン樹脂板を箱形成素材とする一枚の箱展開形成体を組立て形成してなる箱体を有する。
底形成板と第一側壁形成板の第一境界線、及び底形成板と第二側壁形成板の第二境界線のいずれか又は両方の線上を加熱し、谷折溶融部分を形成した状態において直角に折り曲げ、硬化させて側壁を形成する。
連結片が第一側壁形成板と当接する面相互、連結片が第二側壁形成板に当接する面相互を加熱して溶着溶融部分を形成し、加圧して溶着する。
第一折畳片と第一側壁形成板とが当接する面相互、及び第二折畳片と第二側壁形成板とが当接する面相互を加熱して溶着溶融部分を形成し、加圧して溶着する。
【０００４】
前記特願２００２−２０５１１５号記載の物品搬送用箱によれば、底面と側壁の折り曲げ部を直角状態に維持することができ、物品搬送用箱の中の空間形状を精度の高い直方体とすることができる。このため、物品搬送用箱の底部から上部まで被搬送物を隙間なく収容することができ、被搬送物を移動しない状態で搬送し、擦れ合って損傷することを防止する効果がある。また、溶融した樹脂素材が谷折り部分の隅部において底形成板と各側壁形成板を直角状態に固定するため、側壁を押し広げようとする外力や、底板を湾曲させようとする外力が作用しても、この外力による底面と側壁の湾曲を防止することができる。そして側壁の上縁部分（開口部のある部分を箱体の上方として、側壁の上方部分及び開口部を構成する側壁の縁部分）に折畳片が重ね合わされることから側壁の上縁部分の強度が増加し、湾曲を防止することができる。
【０００５】
【発明が解決しようとする課題】
しかし、前記特願２００２−２０５１１５号記載の物品搬送用箱では、折畳片は側壁形成板との境界線で折り曲げられるだけである。この折り曲げ部分は山折りとなる外側の部分、谷折りとなる内側の部分のいずれも固定されない。側壁形成板と折畳片との当接する面相互は溶着して固定されるものの、谷折りとなる内側の部分の近傍では側壁形成板と折畳片を当接させにくく、また無理に当接させると側壁の上縁部分に歪みが生じるため、谷折りとなる内側の部分の近傍も固定することができない。従って、前記従来の物品搬送用箱には、側壁の上縁部分の強度が未だ充分でない点に第一の問題がある。
また、前記側壁形成板と折畳片との谷折りとなる内側の部分の近傍が固定されていないことにより、山折りとなる外側において、箱形成素材の復元力によって丸く膨出する部分が生じる。側壁の上縁部分の断面形状が丸みを帯びた形状に変形すると、上縁部分の寸法精度の確保が困難となり、箱蓋体との間に隙間が生じるおそれがある。従って、前記従来の物品搬送用箱には、箱蓋体との隙間から塵芥が侵入して被搬送物を汚染するおそれがある点に第ニの問題がある。
また、前記従来の物品搬送用箱では、側壁を形成する側壁形成板と連結片との境界線で折り曲げた折り曲げ部分は山折りとなる外側の部分、谷折りとなる内側の部分のいずれも固定されない。隣合う側壁の間に形成される箱体の高さ方向の折り曲げ部分は、箱形成素材の復元力あるいは折り曲げ部分を開く外力の作用により直角状態を維持できず開いてしまう。また、箱体の高さ方向に外力が作用した場合にもこの折り曲げ部分を開く作用が生じる。従って、前記従来の物品搬送用箱には、箱体の高さ方向の折り曲げ部分が開いて箱体の寸法精度を確保することが困難となり、箱蓋体との間に隙間が生じるおそれがある点、高さ方向の強度が急激に低下して、箱体が座屈する畏れがある点に第三の問題がある。
さらに前記従来の物品搬送用箱では、底形成板の対向する縁部にそれぞれ各一対の側壁形成板を延設している。底形成板と側壁形成板との境界線上に谷折溶融部分を形成して折り曲げる場合には、初めに底形成板の対向する一対の縁部に延設された側壁形成板を折り曲げし、次に他の対向する一対の縁部に延設された側壁形成板の折り曲げを行う。後の折り曲げを行う時には初めの折り曲げによって側壁形成板が折り曲げられている。この折り曲げられた側壁形成板は、あとの折り曲げのための谷折溶融部分を形成する谷折加熱部が接近すると熱で溶けて損傷してしまう。このため谷折溶融部分を形成する谷折加熱部は底形成板と側壁形成板との境界線の長さより長いものは使用できない。従って、前記従来の物品搬送用箱には、底形成板と側壁形成板との境界線上に谷折溶融部分を形成して折り曲げる場合には、箱体の寸法に適合させた専用の谷折加熱部を使用する必要があり、他の寸法の箱体で使用する谷折加熱部を共通して使用できない点に第四の問題がある。
【０００６】
本発明は前記の問題点に鑑みてなされたものであり、第一の目的は、側壁の上縁部分の強度が充分にある物品搬送用箱を提供することである。
第二の目的は、上縁部分の寸法精度を確保して、箱蓋体との間に隙間を生じない箱体を形成し、被搬送物の汚染を防止する物品搬送用箱を提供することである。
第三の目的は、箱体の高さ方向の折り目が開くことを防止して箱体の寸法精度を確保し、箱蓋体との間に隙間が生じないようにするとともに、高さ方向の強度を確保して、箱体の座屈に対する強度を高めた物品搬送用箱を提供することである。
第四の目的は、底形成板と側壁形成板との境界線上に谷折溶融部分を形成して折り曲げる場合において、箱体の寸法に適合させた専用の谷折加熱部を使用する必要がなく、他の寸法の箱体で使用する谷折加熱部を共通して使用できる箱体を有する物品搬送用箱を提供することである。
【０００７】
【課題を解決するための手段】
前記目的を達成するため、請求項１に記載の発明では、発泡ポリプロピレン樹脂板を箱形成素材とする箱体展開形成体を組立て形成し上部に開口部を備えた箱体（１）と前記開口部を閉塞する箱蓋体（２）とを有し、谷折側の面の境界線上を加熱により溶着溶融部分とし、前記谷折側の面の境界線で折り曲げて谷折溶融部分を硬化した構成を有する物品搬送用箱において、側壁を構成する側壁形成板の上縁部分に上縁形成片を延設し、前記上縁形成片に対して折畳片を延設し、箱体（１）の側壁の外部面側に、上縁形成片及び折畳片を折曲した構成とし、側壁形成板と折畳片とが側壁の上方部分で対峙する面相互を溶着した構成で、側壁形成板と上縁形成板との境界線上、及び、上縁形成片と折畳片との境界線上で、前記谷折溶融部分が硬化した構成として、側壁の上縁部分の強度と、箱体（１）の寸法精度を確保したことを特徴とする物品搬送用箱とした。
ここで、発泡ポリプロピレン樹脂板は、ポリプロピレン樹脂からなる低発泡、中発泡、高発泡の発泡体をポリプロピレン樹脂からなる板体で挟んだ板状素材である。また上縁部分は、開口部のある部分を箱体（１）の上方として、側壁の上方部分及び開口部を構成する側壁の縁部分である。そして開口部は、箱体（１）と箱蓋体（２）が個別に形成された物品搬送用箱における箱体（１）の開口部と、箱体（１）の一部に箱蓋体（２）が連結形成された物品搬送用箱における開口部とを含む。
【０００８】
請求項２に記載の発明では、箱体展開形成体は、第一箱体展開形成体（１０）と、二枚の第二箱体展開形成体（２０）から構成し、第一箱体展開形成体（１０）について、側壁形成板を第一側壁形成板（１２）、上縁形成片を第一上縁形成片（１５）、折畳片を第一折畳片（１６）とし、前記第一箱体展開形成体（１０）は、底形成板（１１）と、その一対の対向する縁部に前記第一側壁形成板（１２）と、底形成板（１１）の他の対向する縁部に底部連結片（１３）を延設した構成とし、第二箱体展開形成体（２０）は、側壁形成板として第二側壁形成板（２２）を備え、二枚の第二箱体展開形成体（２０）の第二側壁形成板（２２）相互は対向し、且つ、各第二側壁形成板（２２）は第一側壁形成板（１２）に隣接した構成とし、前記底形成板（１１）と第一側壁形成板（１２）との第一境界線（１２１）上、及び底形成板（１１）と底部連結片（１３）との底部境界線（１３１）上を加熱して谷折溶融部分を形成し、第一側壁形成板（１２）と底部連結片（１３）とを第一境界線（１２１）と底部境界線（１３１）とで直角に折り曲げ、硬化させた箱体（１）を有することを特徴とする請求項１記載の物品搬送用箱とした。
【０００９】
請求項３に記載の発明では、請求項２に記載の発明において、第一側壁形成板（１２）の側縁部に、側部境界線（１４１）を介して側部連結片（１４）を延設し、前記側部境界線（１４１）は底部境界線（１３１）の延長線上とし、底部連結片（１３）の底部連結片端部（１３２）と、側部連結片（１４）の側部連結片端部（１４２）とで略Ｖ字形となる切れ込みを形成し、略Ｖ字形の切れ込みの先端は第一境界線（１２１）の端に一致させ、第二箱体展開形成体（２０）について、上縁形成片を第二上縁形成片（２５）、折畳片を第二折畳片（２６）とし、前記第二側壁形成板（２２）の底縁部と側縁部とをそれぞれ前記第一箱体展開形成体（１０）の底部連結片（１３）と側部連結片（１４）とに対峙させるとともに、対峙する面相互を加熱、加圧手段により溶着して組立て形成される箱体（１）を有することを特徴とする請求項２記載の物品搬送用箱とした。
【００１０】
従って、請求項１に記載の発明では、物品搬送用箱を構成する箱体（１）は、発泡ポリプロピレン樹脂板を箱形成素材とする箱体展開形成体を組立て形成し上部に開口部を備えた箱体（１）であり、前記箱体（１）の側壁を構成する側壁形成板の上縁部分に上縁形成片が延設され、前記上縁形成片に対して折畳片が延設されており、前記側壁形成板に対して上縁形成片を折り曲げる谷折り側の面、及び上縁形成片に対して折畳片を折り曲げる谷折り側の面において、前記側壁形成板と上縁形成片との境界線上、及び上縁形成片と折畳片との境界線上を加熱して谷折溶融部分を形成するとともに、側壁形成板と折畳片とが対峙する面相互を加熱して溶着溶融部分を形成し、前記上縁形成片と折畳片とを境界線で折り曲げて谷折溶融部分を硬化させるとともに側壁形成板と折畳片とが対峙する面相互を溶着させる。
【００１１】
請求項２に記載の発明では、請求項１記載の発明において、
前記箱体展開形成体が、底形成板（１１）と第一側壁形成板（１２）とを備えた第一箱体展開形成体（１０）、及び第二側壁形成板（２２）を備えた二枚の第二箱体展開形成体（２０）から構成されており、箱体展開形成体を組立て形成し上部に開口部を備えた箱体（１）を有しており、
前記底形成板（１１）の一対の対向する縁部に第一側壁形成板（１２）が延設され、底形成板（１１）の他の対向する縁部に底部連結片（１３）が延設されており、
前記底形成板（１１）と第一側壁形成板（１２）との第一境界線（１２１）上、及び底形成板（１１）と底部連結片（１３）との底部境界線（１３１）上を加熱して谷折溶融部分を形成し、第一側壁形成板（１２）と底部連結片（１３）とを第一境界線（１２１）と底部境界線（１３１）とで直角に折り曲げ、硬化させる。
【００１２】
請求項３に記載の発明では、請求項２に記載の発明において、
前記第一箱体展開形成体（１０）は、底形成板（１１）の一対の対向する縁部に第一側壁形成板（１２）が延設され、他の対向する縁部に底部連結片（１３）が延設され、前記第一側壁形成板（１２）の上縁部分に第一上縁形成片（１５）が延設され、前記第一上縁形成片（１５）の縁部に第一折畳片（１６）が延設され、前記第一側壁形成板（１２）の側縁部に側部連結片（１４）が延設されており、
前記側部境界線（１４１）は底部境界線（１３１）の延長線上に形成され、底部連結片端部（１３２）と側部連結片端部（１４２）とで略Ｖ字形となる切れ込みが形成され、略Ｖ字形の切れ込みの先端は第一境界線（１２１）の端に一致させており、
前記第二箱体展開形成体（２０）は第二側壁形成板（２２）の上縁部分に第二上縁形成片（２５）が延設され、前記第二上縁形成片（２５）の縁部に第二折畳片（２６）が延設されており、
前記底形成板（１１）と第一側壁形成板（１２）との第一境界線（１２１）上、底形成板（１１）と底部連結片（１３）との底部境界線（１３１）上、及び第一側壁形成板（１２）と側部連結片（１４）との側部境界線（１４１）上を加熱して谷折溶融部分が形成され、
第一側壁形成板（１２）を第一境界線（１２１）で、底部連結片（１３）を底部境界線（１３１）で、側部連結片（１４）を底部境界線（１３１）でそれぞれ直角に折り曲げ、硬化させるとともに、
前記側壁形成板に対して上縁形成片が折り曲げられ、上縁形成片に対して折畳片が折り曲げられて、第一側壁形成板（１２）と第一折畳片（１６）とが対峙する面相互、及び第二側壁形成板（２２）と第二折畳片（２６）とが対峙する面相互がそれぞれ溶着され、
前記第二側壁形成板（２２）の底縁部と側縁部とをそれぞれ前記第一箱体展開形成体（１０）の底部連結片（１３）と側部連結片（１４）とに対峙させるとともに、対峙する面相互を加熱、加圧手段により溶着して組立て形成される。
【００１３】
【発明の実施の形態及び実施例】
本発明を具体化した実施形態について図１から図２８に従って説明する。
【００１４】
本実施形態に係る物品搬送用箱は、２．５ｍｍの肉厚を有する中発泡ポリプロピレン樹脂板を箱形成素材とした３８０×３８０×２３０（ｍｍ）の寸法の箱体１と、箱体１の上部の開口部を閉塞する箱蓋体２を有する物品搬送用箱である。前記箱体１は第一箱体展開形成体１０と二枚の第二箱体展開形成体２０を組立て形成したものであり、前記箱蓋体２は箱蓋体展開形成体３０を組立て形成したものである。
【００１５】
図１は、第一箱体展開形成体１０を組立て形成したときに箱体１の内面となる面を第一箱体展開形成体１０の表面として、第一箱体展開形成体１０の表面を示した平面図である。図１に示すように、前記第一箱体展開形成体１０は箱体１の底部を構成する底形成板１１を有している。第一境界線１２１と底部境界線１３１によって囲まれる四辺形の部分が底部を構成する。
前記底形成板１１の対向する一対の側縁部である第一境界線１２１の外延に箱体１の側壁を構成する第一側壁形成板１２が延設されている。底形成板１１の他の一対の側縁部である底部側縁部の外延には底部連結片１３が延設されている。底部連結片１３は箱体１の側壁を構成する後記第二側壁形成板２２を連結するための部材である。底部連結片１３の幅は４０ｍｍである。
前記第一側壁形成板１２の上縁部分である第一上縁境界線１５１の外延には第一上縁形成片１５が延設されている。第一上縁形成片１５の縁部である第一折畳境界線１６１の外延には第一折畳片１６が延設されている。第一上縁形成片１５と第一折畳片１６は第一側壁形成板１２の上縁部分の強度を増加させる部材である。上縁部分は、また上縁部分は、開口部のある部分を箱体１の上方として、側壁の上方部分及び開口部を構成する側壁の縁部分である。
前記第一側壁形成板１２の側縁部である側部境界線１４１の外延には側部連結片１４が延設されている。側部連結片１４は箱体１の組立てにおいて前記第一側壁形成板１２と後記第二側壁形成板２２を連結する部材である。側部連結片１４の幅は４０ｍｍである。第一側壁形成板１２の側部境界線１４１は、底形成板１１の底部境界線１３１の延長線上に形成される。
【００１６】
図１に示す前記第一箱体展開形成体１０において、底部連結片１３は底部境界線１３１の外延に形成され、底部境界線１３１の延長線上にある側部境界線１４１の外延に側部連結片１４が形成されている。底部連結片１３の端部と側部連結片１４の底部連結片１３がわの端部とは隣接している。底部連結片１３の端部を底部連結片端部１３２とし、底部連結片端部１３２と隣接する側部連結片１４の端部を側部連結片端部１４２とする。前記底部連結片端部１３２の形状は底部境界線１３１と為す角度が鋭角となる形状に形成されており、その角度は４５度である。前記側部連結片端部１４２の形状は側部境界線１４１と為す角度が鋭角となる形状に形成されており、その角度は４５度である。このため、底部連結片端部１３２と側部連結片端部１４２は略Ｖ字形となる切れ込みを形成することとなる。底部連結片端部１３２と側部連結片端部１４２とが挟む角は直角である。略Ｖ字形の切れ込みの先端は第一境界線１２１の端に一致する。略Ｖ字形の切れ込みは底部連結片端部１３２と側部連結片端部１４２とが隣接する四箇所に形成される。
【００１７】
次に図２に示す第二箱体展開形成体２０について説明する。図２は、第二箱体展開形成体２０を組立て形成したときに箱体１の内面となる面を第二箱体展開形成体２０の表面として、第二箱体展開形成体２０の表面を示した平面図である。図示した第二箱体展開形成体２０は二枚の第二箱体展開形成体２０のうちの一枚である。二枚の第二箱体展開形成体２０は同一の形状である。第二箱体展開形成体２０は第二側壁形成板２２を有している。第二側壁形成板２２は前記底形成板１１と第一側壁形成板１２とに連結されて箱体１の側壁を構成する。第二側壁形成板２２の上縁部分である第二上縁境界線２５１の外延には第二上縁形成片２５が延設されている。第二上縁形成片２５の縁部である第二折畳境界線２６１の外延には第二折畳片２６が延設されている。第二上縁形成片２５と第二折畳片２６は第二側壁形成板２２の上縁部分の強度を増加させる部材である。第二上縁形成片２５と第二折畳片２６は第ニ側壁形成板の上縁部分の全長より短く形成される。第二側壁形成板２２の上縁部分の両端より４０ｍｍずつ短い長さとして、第二側壁形成板２２と前記第一側壁形成板１２とを連結した場合に第二上縁形成片２５及び第二折畳片２６が側部連結片１４と干渉しないようにする。
【００１８】
次に図３に示す箱蓋体展開形成体３０について説明する。図３は、箱蓋体展開形成体３０を組立て形成したときに箱蓋体２の内面となる面を箱蓋体展開形成体３０の表面として、箱蓋体展開形成体３０の表面を示した平面図である。箱蓋体展開形成体３０は箱蓋体２の天部を構成する蓋形成板３１を有している。第一蓋境界線３２１と第二蓋境界線３３１によって囲まれる四辺形の部分が天部を構成する。前記蓋形成板３１の対向する一対の側縁部である第一蓋境界線３２１の外延に箱蓋体２の側壁を構成する第一蓋側板３２が延設されている。蓋形成板３１の他の対向する一対の側縁部である第二蓋境界線３３１の外延には第二蓋側板３３が延設されている。また第二蓋側板３３の両端部には蓋側板連結片３４が延設されている。蓋側板連結片３４は箱蓋体２の側壁を構成する第一蓋側板３２と第二蓋側板３３とを連結するための部材である。
【００１９】
前記第一箱体展開形成体１０、二枚の前記第二箱体展開形成体２０、および前記箱蓋体展開形成体３０は、中発泡ポリプロピレン樹脂板を裁断手段を用いて第一箱体展開形成体１０、第ニ箱体展開形成体、及び箱蓋体展開形成体３０の各輪郭形状に裁断して形成する。裁断手段として例えば打ち抜き刃、熱歯型等の公知の裁断手段を用いることができる。
【００２０】
次に第一箱体展開形成体１０と二枚の第二箱体展開形成体２０による箱体１の組立て形成について説明する。
【００２１】
図４は第一箱体展開形成体１０の裏面の斜視図である。図４に示す第一箱体展開形成体１０において、第一側壁形成板１２に対して第一上縁形成片１５が折り曲げられ、第一上縁形成片１５に対して第一折畳片１６が折り曲げられる。第一上縁形成片１５は第一上縁境界線１５１で折り曲げられ、第一折畳片１６は第一折畳境界線１６１で折り曲げられる。第一上縁境界線１５１と第一折畳境界線１６１の間隔は５．０ｍｍである。第一上縁形成片１５と第一折畳片１６は第一箱体展開形成体１０の裏面がわに折り曲げられる。第一箱体展開形成体１０の裏面において、第一上縁境界線１５１上と第一折畳境界線１６１上には後記谷折溶融部分を形成するほかは、折り目とするための罫線や線状の圧縮部分等を形成する必要はない。
【００２２】
前記第一上縁境界線１５１上と第一折畳境界線１６１上には谷折溶融部分が形成される。谷折溶融部分は第一折畳片１６を折り曲げる谷折り側の面に形成される。谷折溶融部分の断面形状は図４のＡ―Ａ断面図である図１５に示すように箱形成素材の外部において幅が広く、内部では幅が狭い形状とする。箱形成素材の外部での谷折溶融部分の幅は、第一側壁形成板１２に対して第一上縁形成片１５を直角に折り曲げた場合に、谷折り側の面において谷折溶融部分の周囲で溶融していない部分が互いに突き当たらない寸法とする。箱形成素材の板厚が２．５ｍｍである本実施形態の場合は、谷折溶融部分の幅は２．５ｍｍとする。谷折溶融部分の深さは箱形成素材の板厚の半分程度とする。谷折溶融部分は発泡ポリプロピレン樹脂板の板体及び発泡体まで溶融させて形成する。谷折溶融部分は谷折り側の面のみに形成し、反対面の板体まで溶融させない。また二本の谷折溶融部分に挟まれる第一上縁形成片１５は熱で溶融させないようにする。
【００２３】
前記第一上縁境界線１５１上と第一折畳境界線１６１上に谷折溶融部分を形成する谷折溶融部分形成手段５０として、第一上縁境界線１５１上と第一折畳境界線１６１上に谷折加熱部５１を接触させる手段を用いることができる。図１６に示すように、谷折加熱部５１は楔形の断面形状を有している。また、谷折加熱部５１は発熱体が内蔵され、または外部から加熱されることによってポリプロピレン樹脂の融点以上の高温状態を維持できる構成を有している。境界線上に加熱された谷折加熱部５１が接触して谷折溶融部分が形成される。図１６に示す谷折加熱部５１は、所定位置にセットされた第一箱体展開形成体１０に対して谷折加熱部５１が境界線上に接触し、所定の時間が経過して境界線上に谷折溶融部分を形成した後に離れるように操作される構成である。この谷折溶融部分形成手段５０では、谷折加熱部５１の断面形状が楔形であり、境界線毎に谷折加熱部５１を接触させて谷折溶融部分を形成する。
【００２４】
図１７に示すように、第一上縁境界線１５１上と第一折畳境界線１６１上を同時に加熱する二本の谷折加熱部５１を平行に並設した谷折溶融部分形成手段５０を用いるようにしてもよい。図１７のＣ―Ｃ断面である図１８に示すように谷折加熱部５１は各々の断面形状を楔形とすることができる。谷折加熱部５１は断面形状が楔型の棒体を二本平行に並設してもよく、二本の谷折加熱部５１を一体に形成することもできる。
【００２５】
次に第一側壁形成板１２と第一折畳片１６とが対峙する面相互を溶着させるため、両面が当接する部分に溶着溶融部分が形成される。図１９に示すように、第一折畳片１６においては、周縁部の一定幅の部分を溶融させない範囲とし、この範囲に囲まれる部分を溶融させて溶着溶融部分とする。溶融させない範囲は溶けた樹脂がはみ出さないようにするためのものであるから、溶融させない範囲はできるだけ狭い幅とすることが好ましい。溶着溶融部分の形成は溶着溶融部分形成手段６０によって行われる。第一側壁形成板１２においては、第一折畳片１６を折り曲げた場合に第一折畳片１６の溶着溶融部分と当接する部分に溶着溶融部分が形成される。
【００２６】
溶着溶融部分を形成させる溶着溶融部分形成手段６０として、箱形成素材に溶着加熱部６１を接触させる手段が用いることができる。図１９に示すように、溶着加熱部６１は長手方向に箱形成素材と接触する面を有する。溶着加熱部６１は第一折畳片１６に形成される溶着溶融部分および第一側壁形成板１２に形成される溶着溶融部分と同じ形状の面である。また溶着加熱部６１は発熱体が内蔵され、または外部から加熱されることによってポリプロピレン樹脂の融点以上の高温状態を維持できる構成を有している。前記第一側壁形成板１２と第一折畳片１６に溶着加熱部６１が接触して溶融させる。溶着加熱部６１は第一折畳片１６と第一側壁形成板１２の谷折り面側を加熱して溶融させる。図１９に示す溶着溶融部分形成手段６０は、セットされた第一箱体展開形成体１０に対して溶着加熱部６１が第一折畳片１６上に接触し、所定の時間が経過して第一折畳片１６上に溶着溶融部分を形成した後に離れるように操作される構成である。同様に溶着加熱部６１が第一側壁形成板１２上に接触し、所定の時間が経過して第一側壁形成板１２上に溶着溶融部分を形成した後に離れるように操作される。この溶着溶融部分形成手段６０では、折畳片と第一側壁形成板１２とに個別に溶着加熱部６１を接触させて溶融させた部分を形成させる。
【００２７】
図２０に示す溶着溶融部分形成手段６０では、第一折畳片１６に溶着溶融部分を形成させる溶着加熱部６１と、第一側壁形成板１２に溶着溶融部分を形成させる溶着加熱部６１とを有している。図２０に示すように、二面の溶着加熱部６１を平行に並設してもよい。この溶着加熱部６１は別体の溶着加熱部６１を平行に並設してもよく、一体に形成することもできる。図２０に示す溶着溶融部分形成手段６０では溶着加熱部６１を第一側壁形成板１２と折畳片に同時に接触させて溶融させた部分を同時に形成させる。
【００２８】
図２１に示す加熱手段４０では、谷折溶融部分形成手段５０と溶着溶融部分形成手段６０とを有している。谷折溶融部分形成手段５０には第一上縁境界線１５１上と第一折畳境界線１６１上に谷折溶融部分を形成する谷折加熱部５１を二本、平行に並設させており、図２１のＤ―Ｄ断面である図２２に示すように、溶着溶融部分形成手段６０には第一折畳片１６に溶着溶融部分を形成させる溶着加熱部６１と、第一側壁形成板１２に溶着溶融部分を形成させる溶着加熱部６１とを並設している。すなわち境界線上に谷折溶融部分を形成する谷折加熱部５１が二本平行に並設され、これを挟むように両側に溶着加熱部６１が並設された構成である。この加熱手段４０では、二本の谷折加熱部５１を境界線上に接触させると同時に二本の溶着加熱部６１を第一側壁形成板１２と第一折畳片１６とに接触させる。境界線上に谷折溶融部分が形成され、同時に溶着溶融部分が形成される。
【００２９】
図５に示すように第一上縁形成片１５は第一側壁形成板１２に対して折り曲げられ、第一折畳片１６は第一上縁形成片１５に対して折り曲げられる。第一上縁形成片１５と第一折畳片１６の折り曲げは、第一上縁境界線１５１上と第一折畳境界線１６１上とに谷折溶融部分が形成され、第一折畳片１６と第一側壁形成板１２に溶着溶融部分が形成された状態において行われる。第一上縁境界線１５１は直角に折り曲げられる。その外側の第一折畳境界線１６１は折り曲げられ、第一側壁形成板１２に対して第一折畳片１６が当接するまで折り曲げられる。第一折畳境界線１６１上の谷折溶融部分は直角で硬化させる。第一上縁境界線１５１上の谷折溶融部を直角状態で保持するため、図２３に示すように、角部形成型７０を用いる。前記角部形成型７０を第一上縁境界線１５１の山折り側の面から当接させる。この状態で谷折溶融部分を硬化させる。第一折畳境界線１６１上の谷折溶融部分は、後記説明するように、第一側壁形成板１２に対して第一折畳片１６を押圧した状態において硬化させる。
【００３０】
前記のように第一上縁形成片１５と第一折畳片１６を折り曲げた状態において、図２３、図２４の矢印のように、同時に第一折畳片１６を第一側壁形成板１２に対して押圧する。第一側壁形成板１２と第一折畳片１６とが対峙する面相互は溶着溶融部分形成手段６０によって溶融させた溶着溶融部分が形成されており、第一折畳片１６の溶着溶融部分と第一側壁形成板１２の溶着溶融部分とが密着した状態とされる。この状態で溶着溶融部分を硬化させ第一側壁形成板１２と第一折畳片１６とを溶着させる。
【００３１】
次に図６は第一箱体展開形成体１０の表面の斜視図であって、図６に示す状態において、底形成板１１に対して底部連結片１３が折り曲げられる。また、第一側壁形成板１２に対して側部連結片１４が折り曲げられる。底部連結片１３と側部連結片１４とは同じ側に折り曲げられる。底形成板１１と底部連結片１３との底部境界線１３１で底部連結片１３が折り曲げられ、第一側壁形成板１２と側部連結片１４との側部境界線１４１で側部連結片１４が折り曲げられる。谷折り側の面は図６に示す第一箱体展開形成体１０の表面がわとする。従って底部連結片１３と側部連結片１４折畳片は図６の表面がわに折り曲げられる。底部境界線１３１上と側部境界線１４１上には後記谷折溶融部分を形成するほかは、折り目とするための罫線や線状の圧縮部分等を形成する必要はない。
【００３２】
前記底部境界線１３１上と側部境界線１４１上とに谷折溶融部分が形成される。前記谷折溶融部分は底部連結片１３と側部連結片１４とを折り曲げる谷折り側の面に形成される。谷折溶融部分の断面形状は、前記第一上縁形成片１５と第一折畳片１６の折り曲げにおいて、第一上縁境界線１５１上と第一折畳境界線１６１上に形成した谷折溶融部分と同様の形状とする。すなわち、図６のＢ―Ｂ断面図である図２５に示すように箱形成素材の外部において幅が広く、内部では幅が狭い形状とする。箱形成素材の外部での谷折溶融部分の幅は、底形成板１１に対して底部連結片１３を直角に折り曲げた場合に、谷折り側の面において谷折溶融部分の周囲で溶融していない部分が互いに突き当たらない寸法とする。箱形成素材の板厚が２．５ｍｍである本実施形態の場合は、谷折溶融部分の幅は２．５ｍｍとする。谷折溶融部分の深さは箱形成素材の板厚の半分程度とする。谷折溶融部分は発泡ポリプロピレン樹脂板の板体及び発泡体まで溶融させて形成する。谷折溶融部分は谷折り側の面のみに形成し、反対面の板体まで溶融させない。側部境界線１４１上の谷折溶融部分についても同様とするため、説明を省略する。
【００３３】
底部境界線１３１上と側部境界線１４１上とに谷折溶融部分を形成する谷折溶融部分形成手段５０として、境界線上に谷折加熱部５１を接触させる手段を用いることができる。図２６に示すように、谷折加熱部５１は楔形の断面形状を有している。また、谷折加熱部５１は発熱体が内蔵され、または外部から加熱されることによってポリプロピレン樹脂の融点以上の高温状態を維持できる構成を有している。境界線上に谷折加熱部５１が接触して谷折溶融部分が形成される。図２６に示す谷折加熱部５１は、所定位置にセットされた第一箱体展開形成体１０に対して谷折加熱部５１が境界線上に接触し、所定の時間が経過して谷折溶融部分を形成した後に離れるように操作される構成である。この谷折溶融部分形成手段５０では、谷折加熱部５１の断面形状が楔形であり、境界線毎に谷折加熱部５１を接触させて谷折溶融部分を形成する。
【００３４】
上記第一箱体展開形成体１０では底部境界線１３１の延長線上に側部境界線１４１がある。従って、谷折加熱部５１の全長が長く直線状である谷折溶融部分形成手段５０を用いて、底部境界線１３１上と側部境界線１４１上とに谷折加熱部５１を同時に接触させることができ、谷折溶融部分を同時に形成させることができる。谷折加熱部５１の全長は底部境界線１３１と二本の側部境界線１４１の長さの和より長くすることで、底部境界線１３１上と側部境界線１４１上とに谷折溶融部分を同時に形成することができる。本実施形態では図２６の図面右側の底部境界線１３１上と二本の側部境界線１４１上に谷折溶融部分形成手段５０の谷折加熱部５１を同時に接触させて、谷折溶融部分を同時に形成する。次に図面左側の底部境界線１３１上と二本の側部境界線１４１上に谷折溶融部分形成手段５０の谷折加熱部５１を同時に接触させて、谷折溶融部分を同時に形成する。
【００３５】
底形成板１１に対して底部連結片１３が折り曲げられ、第一側壁形成板１２に対して側部連結片１４が折り曲げられる。底部連結片１３と側部連結片１４の折り曲げは、底部境界線１３１上と側部境界線１４１上とに谷折溶融部分が形成された状態において行われる。底部連結片１３と側部連結片１４は直角に折り曲げられ、谷折溶融部分を直角の状態で硬化させる。底部境界線１３１上の谷折溶融部分を直角状態で保持するため、図２７に示すように、角部形成型７０を用いる。前記角部形成型７０を底部境界線１３１の山折り側の面から角部に当接させる。この状態で谷折溶融部分を硬化させる。側部境界線１４１上の谷折り目も同様に直角に折り曲げされ、直角状態で谷折溶融部分を硬化させる。
【００３６】
次に図７に示す状態において、底形成板１１に対して第一側壁形成板１２が折り曲げられる。第一側壁形成板１２の折り曲げは第一境界線１２１で行われる。谷折り側の面は図７に示す第一箱体展開形成体１０の表面がわとする。第一境界線１２１上には後記谷折溶融部分を形成するほかは、折り目とするための罫線や線状の圧縮部分等を形成する必要はない。
【００３７】
前記第一境界線１２１上には谷折溶融部分が形成される。谷折溶融部分は第一側壁形成板１２を折り曲げる谷折り側の面に形成される。谷折溶融部分の断面形状は、前記第一折畳片１６の折り曲げにおいて、第一折畳境界線１６１上に形成した谷折溶融部分と同様の形状とするため詳しい説明は省略する。
また、谷折り目上に谷折溶融部分を形成する谷折溶融部分形成手段５０として、谷折り目に谷折加熱部５１を接触させる手段を用いることができる。本実施例では底部境界線１３１上と側部境界線１４１上に谷折溶融部分を形成した谷折溶融部分形成手段５０を用いる。そのため谷折溶融部分形成手段５０についてここでの説明は省略する。
【００３８】
図２８に示すように、前記底部連結片１３と側部連結片１４とはそれぞれ底形成板１１と第一側壁形成板１２に対して直角に折り曲げられている。折り曲げの方向は第一側壁形成板１２を折り曲げる方向と同じである。従って、第一側壁形成板１２を折り曲げる谷折り側の面に底部連結片１３と側部連結片１４とが折り曲げられる。前記底部連結片端部１３２と前記側部連結片端部１４２は略Ｖ字形となる切れ込みを形成している。底部連結片端部１３２と側部連結片端部１４２とが挟む角は直角である。略Ｖ字形の切れ込みの先端は第一境界線１２１の端に一致している。また略Ｖ字形の切れ込みは底部連結片端部１３２と側部連結片端部１４２とが隣接する４箇所に形成されるため、第一境界線１２１の両端には前記略Ｖ字形の切れ込みが形成されている。
【００３９】
図２８に示すように本実施例で使用する谷折溶融部分形成手段５０の谷折加熱部５１の長さは第一境界線１２１の長さより長い。従って、折り曲げられた前記底部連結片１３及び側部連結片１４に対して谷折加熱部５１が交差する。しかし前記底部連結片端部１３２と前記側部連結片端部１４２は略Ｖ字形となる切れ込みを形成している。この略Ｖ字形の切れ込みにより谷折加熱部５１は底部連結片１３及び側部連結片１４と接触しないで、第一境界線１２１上に接触することができ、第一境界線１２１上に谷折溶融部分を形成することができる。
【００４０】
図２８に示すように底形成板１１に対して第一側壁形成板１２が折り曲げられる。第一側壁形成板１２の折り曲げは、第一境界線１２１上に谷折溶融部分が形成された状態において行われる。第一側壁形成板１２は底形成板１１に対して直角に折り曲げされる。第一境界線１２１上の谷折溶融部分は直角で硬化させる。第一境界線１２１上の谷折溶融部分を直角状態で保持するため、連結片の曲げと同様に、角部形成型７０を用いる。前記角部形成型７０を第一境界線１２１の山折り側の面から角部に当接させる。この状態で谷折溶融部分を硬化させる。
【００４１】
次に、第二箱体展開形成体２０の第二上縁形成片２５と第二折畳片２６の折り曲げについて説明する。
図９は第二箱体展開形成体２０の裏面の斜視図である。第二側壁形成板２２に対して第二上縁形成片２５が折り曲げられ、第二上縁形成片２５に対して第二折畳片２６が折り曲げられる。第二上縁形成片２５は第二上縁境界線２５１で折り曲げられ、第二折畳片２６は第二折畳境界線２６１で折り曲げられる。第二上縁境界線２５１と第二折畳境界線２６１の間隔は５．０ｍｍである。谷折り側の面は図９において第二箱体展開形成体２０の裏面側とする。谷折り側の面において、第二上縁境界線２５１上と第二折畳境界線２６１上には後記谷折溶融部分を形成するほかは、折り目とするための罫線や線状の圧縮部分等を形成する必要はない。
【００４２】
前記第二上縁境界線２５１上と第二折畳境界線２６１上に谷折溶融部分が形成される。谷折溶融部分は第二折畳片２６を折り曲げる谷折り側の面に形成される。谷折溶融部分の断面形状は第一箱体展開形成体１０の第一上縁形成片１５の折り曲げにおいて、第一上縁境界線１５１上に形成される谷折溶融部分と同様であるため、詳しい説明は省略する。
【００４３】
また、第二上縁境界線２５１上と第二折畳境界線２６１上に谷折溶融部分を形成する谷折溶融部分形成手段５０は、境界線上に谷折加熱部５１を接触させる手段を用いることができ、第一箱体展開形成体１０の第一上縁形成片１５と第一折畳片１６の折り曲げにおいて、境界線上に谷折溶融部分を形成させる谷折溶融部分形成手段５０と同様であるため詳しい説明は省略する。
【００４４】
次に第二側壁形成板２２と第二折畳片２６とが対峙する面相互を溶着させるため、両面が当接する部分に溶着溶融部分が形成される。第二折畳片２６においては、周縁部の一定幅の部分を溶融させない範囲とし、この範囲に囲まれる部分を溶融させて溶着溶融部分とする。溶融させない範囲は溶けた樹脂がはみ出さないようにするためのものであるから、溶融させない範囲はできるだけ狭い幅とすることが好ましい。溶着溶融部分の形成は溶着溶融部分形成手段６０によって行われる。第二側壁形成板２２においては、第二折畳片２６を折り曲げた場合に第二折畳片２６の溶着溶融部分と当接する部分に溶着溶融部分が形成される。
第二折畳片２６と第二側壁形成板２２とに溶着溶融部分を形成させる溶着溶融部分形成手段６０として、箱形成素材に溶着加熱部６１を接触させる手段が用いることができる。溶着溶融部分形成手段６０は、第一箱体展開形成体１０の第一折畳片１６と第一側壁形成板１２との溶着において使用される溶着溶融部分形成手段６０と同様であるため、詳しい説明は省略する。
【００４５】
第二上縁形成片２５は側壁形成板に対して折り曲げられ、第二折畳片２６は第二上縁形成片２５に対して折り曲げられる。第二上縁形成片２５と第二折畳片２６の折り曲げは、第二上縁境界線２５１上と第二折畳境界線２６１上とに谷折溶融部分が形成され、第二折畳片２６と第二側壁形成板２２に溶着溶融部分が形成された状態において行われる。第二上縁境界線２５１は直角に折り曲げられる。その外側の第二折畳境界線２６１は折り曲げられ、第一側壁形成板１２に対して第一折畳片１６が当接するまで折り曲げられる。第二折畳境界線２６１上の谷折溶融部分は直角で硬化させる。第二上縁境界線２５１上の谷折溶融部を直角状態で保持するため、図２３に示す第一上縁形成片１５と第一折畳片１６と同様に、角部形成型７０を用いる。前記角部形成型７０を第一上縁境界線１５１の山折り側の面から当接させる。この状態で谷折溶融部分を硬化させる。第二折畳境界線２６１上の谷折溶融部分は、後記説明するように、第二側壁形成板２２に対して第二折畳片２６を押圧した状態において硬化させる。
【００４６】
前記のように第二上縁形成片２５と第二折畳片２６を折り曲げた状態において、同時に第二折畳片２６を第二側壁形成板２２に対して押圧する。第二側壁形成板２２と第二折畳片２６とが対峙する面相互は溶着溶融部分形成手段６０によって溶融させた溶着溶融部分が形成されており、第二折畳片２６の溶着溶融部分と第二側壁形成板２２の溶着溶融部分とが密着した状態とされる。この状態で溶着溶融部分を硬化させ第二側壁形成板２２と第二折畳片２６とを溶着させる。
【００４７】
図１１に示すように組立てられた第一箱体展開形成体１０に対して第二箱体展開形成体２０が連結されて箱体１が形成される。図１２に示すように底形成板１１と第一側壁形成板１２とが第二側壁形成板２２に連結される。連結は溶着によって行われる。前記底部連結片１３の表面と第二側壁形成板２２の裏面の下縁部とが溶着され、前記側部連結片１４の表面と第二側壁形成板２２の裏面の側縁部とが溶着される。第二側壁形成板２２の上縁部分において第二折畳片２６が折り曲げられた面と同じ面に底部連結片１３及び側部連結片１４が溶着されることとなる。しかし、第二折畳片２６は第ニ側壁形成板の上縁部分の全長より短く形成されており、第二側壁形成板２２の上縁部分の両端より４０ｍｍずつ短い長さとしているため、第二折畳片２６と側部連結片１４とが干渉することはない。
【００４８】
前記底部連結片１３の表面と第二側壁形成板２２の裏面の下縁部とが対峙する面相互、前記側部連結片１４の表面と第二側壁形成板２２の裏面の側縁部とが対峙する面相互を溶着させるため、各面が当接する部分に溶融させた部分が形成される。溶融は各面を加熱させて行い、加熱させた部材の当接や高温の気体の吹き付け等の手段を用いることができる。
【００４９】
前記底部連結片１３の表面と第二側壁形成板２２の裏面の下縁部とが対峙する面相互、前記側部連結片１４の表面と第二側壁形成板２２の裏面の側縁部とが対峙する面相互に溶融させた部分を形成した状態で、第二側壁形成板２２の下縁部を底部連結片１３に対して押圧し、第二側壁形成板２２の側縁部を側部連結片１４に対して押圧する。各面の溶融させた部分が密着し、この状態で溶融させた部分を硬化させて底部連結片（１３）と側部連結片１４とを第二側壁形成板２２に溶着させる。
【００５０】
次に、箱蓋体展開形成体３０の折り曲げについて説明する。
図１３は箱蓋体展開形成体３０の表面の斜視図である。図１３に示す蓋形成板３１に対して第一蓋側板３２が折り曲げられる。第一蓋側板３２は蓋形成板３１に対して第一蓋境界線３２１で折り曲げられる。谷折り側の面は図１３において箱蓋体展開形成体３０の表面がわとする。折り曲げは第一箱体展開形成体１０において底形成板１１に対して底部連結片１３が折り曲げられる場合と同様に、第一蓋境界線３２１上に谷折溶融部分を形成して、直角に折り曲げるようにしてもよい。また、箱蓋体展開形成体３０の裁断と同時、または裁断後において、第一蓋境界線３２１上に折り目とするための罫線や線状の圧縮部分等を形成し、これを谷折りして蓋形成板３１に対して第一蓋側板３２を折り曲げられるようにしてもよい。蓋形成板３１に対する第二蓋側板３３の折り曲げも、第二蓋側板３３と同様に行う。
【００５１】
次に、第二蓋側板３３に対して蓋側板連結片３４が折り曲げられる。図１４に示すように蓋側板連結片３４が第一蓋側板３２に当接するように折り曲げられる。蓋側板連結片３４の表面と第一蓋側板３２の裏面とが当接するように折り曲げられる。蓋側板連結片３４と第一蓋側板３２とが対峙する面相互は、溶着して固定する。蓋側板連結片３４と第一蓋側板３２とが対峙する面相互を溶着させるため、両面が当接する部分に溶着溶融部分が形成される。溶着溶融部分を形成させた状態で第一蓋側板３２に対して蓋側板連結片３４を押圧し、この状態で溶融させた部分を硬化させて蓋側板連結片３４と第一蓋側板３２とを溶着させる。
【００５２】
この実施の形態では以下の効果を有する。
（イ） 箱形成素材としての中発泡ポリプロピレン樹脂板は、ポリプロピレン樹脂の発泡体を板体で挟んだ構成であるため、曲げに対する強度が高い。また低発泡ポリプロピレン樹脂板と比較して発泡体の強度も高い。紙段ボール製またはポリプロピレン段ボール製の箱形成素材と同程度の板厚で高い強度を得ることもできる。よって従来は紙段ボール製またはポリプロピレン段ボール製の箱形成素材を使用した物品搬送用箱を用いていた分野において、物品搬送用箱の寸法を変化させることなく箱形成素材を中発泡ポリプロピレン樹脂板に換えることができる。
（ロ） 例えば、物品搬送用箱から自動化された取出し装置を用いて被搬送物を取り出す場合において、取出し装置の動作の位置決めが物品搬送用箱の寸法を基準に行われている場合には、従来使用されていた物品搬送用箱と寸法が異なる物品搬送用箱は使用できない。しかし、中発泡ポリプロピレン樹脂板を箱形成素材とした物品搬送用箱は従来の物品搬送用箱と同一寸法にすることができるため、前記自動化された取出し装置においても使用することができる。
【００５３】
（ハ） 箱体展開形成体の曲げ部分に谷折溶融部分を形成して折り曲げているため、箱体展開形成体の裁断において、折り曲げ部分に熱歯型等による折り目とするため罫線や線状の圧縮部分を形成する必要がなく、箱体展開形成体を加工する手数が低減できる。
【００５４】
（ニ） 第一箱体展開形成体１０において底形成板１１の一対の対向する縁部に第一側壁形成板１２が延設されており、他の対向する縁部には底部連結片１３が延設されており、第一箱体展開形成体１０の外形輪郭形状は略長方形である。このため箱形成素材から第一箱体展開形成体１０を裁断する場合に無駄部分を少なくすることができ、また第二箱体展開形成体２０と箱蓋体展開形成体３０についても同様の理由から無駄部分を少なくすることができる。よって物品搬送用箱の製造コストを低減することができる。
【００５５】
（ホ） 折り曲げする場合に境界線上を加熱して谷折溶融部分を形成させたり、溶着する場合に対峙する面相互を加熱して溶着溶融部分を形成するが、発泡ポリプロピレン樹脂板の発泡体は熱伝導率が低く、溶融させる部分に加える熱は反対面まで伝導しにくい。従って熱が反対の面まで伝導しないため、熱で歪みが生じない。また硬化するときに収縮が生じても発泡体が歪みを吸収するので反対面に歪みが生じない。このため、物品搬送用箱の内部の空間形状に歪みがなく、内部に被搬送物を隙間なく収容することができる。
【００５６】
（ヘ） 上縁境界線上と折畳境界線上の二本の谷折溶融部分に挟まれる上縁形成片は、熱で溶融させないようにする。従って上縁形成片の強度を確保して側壁の上縁部分の折り曲げ部分の強度を確保することができる。
【００５７】
（ト） 上縁形成片と折畳片の折り曲げにおいて、上縁境界線上と折畳境界線上を加熱する二本の谷折加熱部５１を平行に並設した谷折溶融部分形成手段５０を用いることにより、箱形成部材の上縁境界線上と折畳境界線上とに二本の谷折溶融部分を同時に形成することができるため、箱体１の組立て形成を迅速に行うことができる。
（チ） 折畳片に溶着溶融部分を形成させる溶着加熱部６１と、側壁形成板に溶着溶融部分を形成させる溶着加熱部６１を並設した溶着溶融部分形成手段６０を用いることにより、側壁形成板と折畳片とが対峙する面相互に溶融させた部分が同時に形成され、物品搬送用箱の組立て形成が迅速に行われる。
（リ） 上縁境界線上と折畳境界線上に谷折溶融部分を形成する谷折加熱部５１が二本平行に並設され、これを挟むように両側に溶着加熱部６１が並設された加熱手段４０によれば、上縁境界線上と折畳境界線上に谷折溶融部分を形成させると同時に、側壁形成板と折畳片とが対峙する面相互に溶着溶融部分が形成され、物品搬送用箱の組立て形成が迅速に行われる。
【００５８】
（ヌ）上縁境界線を折り曲げる場合に、角部形成型７０を用いて直角状態で谷折溶融部を硬化させたことにより、上縁境界線の近傍に残存する箱形成素材の復元力によって直角でない状態で谷折溶融部分が硬化してしまうことを防止することができる。そして境界線上の谷折り目を硬化させたことにより硬化させた部分が側壁形成板、上縁形成片、折畳片を固定する。上縁形成片が側壁の上縁部分の強度を確保するとともに上縁部分の直線状態を確保することができる。箱体１の高さ寸法精度を確保して、隣り合う各側壁の上縁部分の高さが一定になるため、箱蓋体２で開口部を閉塞させた場合に箱体１の上縁部分と箱蓋体２とが密着して隙間をなくすことができ、被搬送物の汚染を防止することができる。
【００５９】
（ル） 折畳片と側壁形成板とを溶着したため、側壁の上縁を曲げる方向に外力が作用しても、折畳片と側壁形成板とが相互に摺動せず、側壁の上縁部分の強度が確保される。
【００６０】
（ヲ） 第一箱体展開形成体１０の底部境界線１３１の延長線上に側部境界線１４１がある。従って、谷折加熱部５１の全長が長く直線状である谷折溶融部分形成手段５０を用いて、底部境界線１３１上と側部境界線１４１上とに谷折加熱部５１を同時に接触させることができ、谷折溶融部分を同時に形成させることができる。
仮に底部境界線１３１と側部境界線１４１とが直線上にない場合には、谷折加熱部５１の全長が長く直線状である谷折溶融部分形成手段５０では底部境界線１３１や側部境界線１４１以外の部分に谷折加熱部５１が接触してしまうため、使用できない。この場合には、底部境界線１３１上の谷折溶融部分と側部境界線１４１上の谷折溶融部分を同時に形成することはできない。また、底部境界線１３１と側部境界線１４１とが直線上にない場合であって、底部境界線１３１上と側部境界線１４１上とに谷折溶融部分を同時に形成する場合には、第一箱体展開形成体１０の形状に合わせた専用の谷折加熱部５１を有する谷折溶融部分形成手段５０を使用しなければならない。
【００６１】
（ワ） 第一境界線１２１上に谷折溶融部分を形成する谷折溶融部分形成手段５０の谷折加熱部５１の長さは第一境界線１２１の長さより長く、従って、折り曲げられた前記底部連結片１３及び側部連結片１４に対して谷折加熱部５１が交差する。しかし、前記底部連結片端部１３２と前記側部連結片端部１４２は略Ｖ字形となる切れ込みを形成している。この略Ｖ字形の切れ込みにより谷折加熱部５１は底部連結片１３及び側部連結片１４と接触しないで、第一境界線１２１上に接触することができ、第一境界線１２１上に谷折溶融部分を形成することができる。よって谷折加熱部５１の長さを第一境界線１２１の長さ以下にする必要がなく、底部境界線１３１上と側部境界線１４１上に谷折溶融部分を形成する全長の長い谷折加熱部５１を使用することができる。さらに、箱体１の寸法に適合させた専用の谷折加熱部５１を使用する必要がなく、他の寸法の箱体１で使用する谷折加熱部５１を共通して使用することができる。
【００６２】
（カ） 底部境界線１３１上と側部境界線１４１上の谷折溶融部分を直角状態で保持させ、硬化させたため、底部境界線１３１と側部境界線１４１の近傍に残存する箱形成素材の復元力によって直角でない状態で谷折溶融部分が硬化してしまうことを防止することができる。
（ヨ） 側部境界線１４１上の谷折溶融部分を直角状態で硬化させたため、隣合う側壁の間に形成される箱体１の高さ方向の折り曲げ部分は、箱形成素材の復元力あるいは折り曲げ部分を開く外力が作用しても直角状態を維持することができる。また、箱体１の高さ方向に外力が作用した場合にこの折り曲げ部分を開く作用が生じても直角状態を維持することができる。従って、箱体１の高さ方向の折り曲げ部分が開くことがなく箱体１の寸法精度を確保することができるとともに、箱蓋体２との間に隙間が生じず、また高さ方向の強度が維持することができるから、箱体１の座屈に対する強度を高めることができる。
（タ） 底部境界線１３１上と側部境界線１４１上との谷折溶融部分を直角状態で保持して硬化させるため、第一側壁形成板１２と第二側壁形成板２２を底形成板１１に対して直角に立設することができる。箱空間を直方体に保持でき、高さ方向の強度が高くなる。
【００６３】
（レ） 第二側壁形成板２２の縁部の外面と、連結片の内面とが当接して溶着されている。従って、底部連結片１３、側部連結片１４、第二折畳片２６が物品搬送用箱の内部の空間内に突出せず、内部の空間に突起のない物品搬送用箱を提供することができる。
【００６４】
なお、実施の形態は上記に限定されるものではなく、例えば次のように変更してもよい。
【００６５】
箱形成素材としての中発泡ポリプロピレン樹脂板のほか、低発泡ポリプロピレン樹脂板や高発泡ポリプロピレン樹脂板を使用することができる。いずれもポリプロピレン樹脂の発泡体を板体で挟んだ構成であるため、曲げに対する強度が高い。
【００６６】
上縁境界線と折畳境界線の間隔は広げてもよく、狭くしてもよい。上縁境界線と折畳境界線の間隔を狭くした場合には、側壁形成板と折畳片が当接する面が増加し、溶着面を増加させることができる。溶着面を増加させると箱体１の上縁部分の強度をより高めることができる。上縁境界線と折畳境界線の間隔を広くした場合、箱体１の上縁部分の幅を広くすることができ、上縁部分の直線状態が確実に確保されるとともに上縁部分の強度を高めることができる。
【００６７】
上縁境界線上と折畳境界線上に谷折溶融部分を形成し、側壁形成板と折畳片とが対峙する面相互には溶着溶融部分を形成しない状態で、側壁形成板に対して上縁と折畳片を折り曲げるようにしてもよい。谷折溶融部分が硬化することで側壁の上縁部分の強度が高まるため、側壁形成板と折畳片との溶着を省略することができる。
【００６８】
底形成板１１の対向する一対の縁部に形成される底部境界線１３１上に谷折溶融部分を同時に形成するため、谷折加熱部５１を二本平行に並設した谷折溶融部分形成手段５０を用いてもよい。
また底部境界線１３１の延長線上に二本の側部境界線１４１が形成されている場合には、一対の底部境界線１３１上とこの延長線上にある側部境界線１４１上に谷折加熱部５１を同時に形成できるように谷折加熱部５１を二本平行に並設した谷折溶融部分形成手段５０を用いてもよい。この谷折溶融部分形成手段５０を使用することにより、底形成板１１の対向する他の一対の縁部に形成される第一境界線１２１上にも同時に谷折溶融部分を形成することができる。
【００６９】
箱体展開形成体において折畳片の外にさらに他の折畳片を延設し、折畳片を二重以上にして側壁形成板に溶着するようにしてもよい。この場合、側壁形成板の上縁部分の強度が増加するとともに、物品搬送用箱を持ち上げる場合に前記折畳片に手指が掛かりやすくなり、運搬が容易な物品搬送用箱を提供することができる。
【００７０】
第二側壁形成板２２の縁部の内面と、連結片の外面とが当接して溶着されるようにしてもよい。この場合には、外部面に突起がない箱体１を提供することができる。
【００７１】
溶着溶融部分の形成は、加熱させた部材の当接のほか、高温の気体の吹き付け等の手段を用いることができる。
【００７２】
上記実施の形態から把握できる請求項記載以外の技術思想（発明）について以下にその効果とともに記載する。
請求項１から請求項４に記載の発明において、上縁形成片を側壁形成板に対して直角に曲げ、直角状態で谷折溶融部を硬化させる。
上縁形成片が側壁の上縁部分の強度を確保するとともに上縁部分の直線状態を確保することができる。箱体１の高さ寸法精度を確保して、隣り合う各側壁の上縁部分の高さが一定になるため、箱蓋体２で開口部を閉塞させた場合に箱体１の上縁部分と箱蓋体２とが密着して隙間をなくすことができ、被搬送物の汚染を防止することができる。
【００７３】
【発明の効果】
以上詳述したように、請求項１から請求項４に記載の発明によれば、
側壁の上縁において、側壁形成板に延設される上縁形成片と折畳片を折り曲げ、上縁形成片と折畳片との境界線上に形成する谷折溶融部分を硬化させ、側壁形成板と折畳片とが対峙する面相互を溶着したことにより、側壁の上縁部分の強度を確保することができるとともに、箱体（１）の寸法精度を確保でき、箱蓋体（２）で開口部を閉塞させた場合に箱体（１）の上縁部分と箱蓋体（２）とが密着して隙間をなくすことができ、被搬送物の汚染を防止することができる。
【００７４】
請求項４に記載の発明によれば、側部境界線（１４１）上の谷折溶融部分を直角状態で硬化させたため、隣合う側壁の間に形成される箱体（１）の高さ方向の折り曲げ部分は、箱形成素材の復元力あるいは折り曲げ部分を開く外力が作用しても直角状態を維持することができる。また、箱体（１）の高さ方向に外力が作用した場合にこの折り曲げ部分を開く作用が生じても直角状態を維持することができる。従って、箱体（１）の高さ方向の折り目が開くことを防止して箱体（１）の寸法精度を確保し、箱蓋体（２）との間に隙間が生じないようにするとともに、高さ方向の強度が確保して、箱体（１）の座屈に対する強度を高めた物品搬送用箱を提供することができる。
【００７５】
請求項４に記載の発明によれば、底部連結片端部（１３２）と側部連結片端部（１４２）は略Ｖ字形となる切れ込みを形成しており、この略Ｖ字形の切れ込みにより谷折加熱部（５１）は底部連結片（１３）及び側部連結片（１４）と接触しないで、第一境界線（１２１）上に接触することができ、第一境界線（１２１）上に谷折溶融部分を形成することができる。このため底形成板（１１）と側壁形成板との境界線上に谷折溶融部分を形成して折り曲げる場合において、箱体（１）の寸法に適合させた専用の谷折加熱部（５１）を使用する必要がなく、他の寸法の箱体で使用する谷折加熱部（５１）を共通して使用できる箱体（１）を有する物品搬送用箱を提供することができる。
【図面の簡単な説明】
【図１】 本発明の実施形態の第一箱体展開形成体（１０）であり、第一箱体展開形成体（１０）を組立て形成したときに箱体（１）の内面となる面を第一箱体展開形成体（１０）の表面として、第一箱体展開形成体（１０）の表面を示した平面図である。
【図２】 本発明の実施形態の第二箱体展開形成体（２０）であり、第二箱体展開形成体（２０）を組立て形成したときに箱体（１）の内面となる面を第二箱体展開形成体（２０）の表面として、第二箱体展開形成体（２０）の表面を示した平面図である。
【図３】 本発明の実施形態の箱蓋体展開形成体（３０）であり、箱蓋体展開形成体（３０）を組立て形成したときに箱蓋体（２）の内面となる面を箱蓋体展開形成体（３０）の表面として、箱蓋体展開形成体（３０）の表面を示した平面図である。
【図４】 第一箱体展開形成体（１０）の裏面の斜視図である。
【図５】 第一上縁形成片と第一折畳片を折り曲げた第一箱体展開形成体（１０）の裏面の斜視図である。
【図６】 第一箱体展開形成体（１０）の表面の斜視図である。
【図７】 底部連結片と側部連結片を折り曲げた第一箱体展開形成体（１０）の表面の斜視図である。
【図８】 第一側壁形成板を折り曲げた第一箱体展開形成体（１０）の斜視図である。
【図９】 第二箱体展開形成体（２０）の裏面の斜視図である。
【図１０】 第二上縁形成片と第二折畳片を折り曲げた第二箱体展開形成体（２０）の裏面の斜視図である。
【図１１】 第一箱体展開形成体と第二箱体展開形成体（２０）を溶着する前の状態の斜視図である。
【図１２】 本発明の実施形態の箱体（１）の斜視図である。
【図１３】 箱蓋体展開形成体（３０）の表面の斜視図である。
【図１４】 本発明の実施形態の箱蓋体（２）の斜視図である。
【図１５】 図４のＡ―Ａ断面図である。
【図１６】 第一上縁境界線上に谷折溶融部分を形成する谷折溶融部分形成手段（５０）の斜視図である。
【図１７】 第一上縁境界線上と第一折畳境界線上とに谷折溶融部分を形成する谷折溶融部分形成手段（５０）の斜視図である。
【図１８】 図１７のＣ―Ｃ断面図である。
【図１９】 第一折畳片上に溶着溶融部分を形成する溶着溶融部分形成手段（６０）の斜視図である。
【図２０】 第一折畳片上と第一側壁形成板とに溶着溶融部分を形成する溶着溶融部分形成手段（６０）の斜視図である。
【図２１】 谷折溶融部分形成手段と溶着溶融部分形成手段とを有する加熱手段（４０）の斜視図である。
【図２２】 図２１のＤ―Ｄ断面図である。
【図２３】 第一上縁形成片と第一折畳片を折り曲げ、角部形成型（７０）に当接させた状態の斜視図である。
【図２４】 図２３のＥ―Ｅ断面図である。
【図２５】 図６のＢ―Ｂ断面図である。
【図２６】 底部境界線上と側部境界線上に谷折溶融部分を形成する谷折溶融部分形成手段（５０）の斜視図である。
【図２７】 底部連結片と側部連結片を折り曲げ、角部形成型（７０）に当接させた状態の斜視図である。
【図２８】 第一境界線上に谷折溶融部分を形成する谷折溶融部分形成手段（５０）の斜視図である。
【符号の説明】
１ 箱体
２ 箱蓋体
１０ 第一箱体展開形成体
１１ 底形成板
１２ 第一側壁形成板
１３ 底部連結片
１４ 側部連結片
１５ 第一上縁形成片
１６ 第一折畳片
１３２ 底部連結片端部
１４２ 側部連結片端部
１２１ 第一境界線
１３１ 底部境界線
１４１ 側部境界線
１５１ 第一上縁境界線
１６１ 第一折畳境界線
２０ 第二箱体展開形成体
２２ 第二側壁形成板
２５ 第二上縁形成片
２６ 第二折畳片
２５１ 第二上縁境界線
２６１ 第二折畳境界線
３０ 箱蓋体展開形成体
３１ 蓋形成板
３２ 第一蓋側板
３３ 第二蓋側板
３４ 蓋側板連結片
３２１ 第一蓋境界線
３３１ 第二蓋境界線
４０ 加熱手段
５０ 谷折溶融部分形成手段
５１ 谷折加熱部
６０ 溶着溶融部分形成手段
６１ 溶着加熱部
７０ 角部形成型[0001]
[Technical field to which the invention belongs]
  The present invention relates to an article transport box which is formed of a foamed polypropylene resin plate and is mainly used for article transport.
[0002]
[Prior art]
  2. Description of the Related Art As a conventional article carrying box, an article carrying box is known that is formed by assembling a box forming material made of paper cardboard or polypropylene cardboard. The functions required for the article transport box are that the object to be accommodated is not damaged and the object to be transported is not contaminated, so that the article transport box can be used repeatedly. Functions such as weather resistance, durability and hygienic usability are also required. However, in the article transport box made of paper corrugated cardboard or polypropylene corrugated cardboard, since the box forming material is soft, there is a problem that the side wall and the bottom surface of the goods transport box are curved. For example, when the transported object is accommodated and lifted, the side walls and the bottom surface are curved during transport, and a gap is generated between the transported object or between the transported object and the article transport box, and the transported object moves and rubs. If the transported object falls into the gap or falls, the transported object is damaged. In addition, a gap with the lid portion is generated due to the curvature of the side wall and the bottom portion, and dust is infiltrated therefrom to contaminate the object to be conveyed.
[0003]
  The inventor has invented an article transport box using a low-foamed polypropylene resin plate as a box-forming material in order to solve the above-mentioned problems, and the characteristics thereof are as follows (see Japanese Patent Application No. 2002-205115).
  It has a box formed by assembling and forming a single box development formed body using a low foamed polypropylene resin plate as a box forming material.
  In the state where the first boundary line of the bottom forming plate and the first side wall forming plate and the first boundary line of the bottom forming plate and the second side wall forming plate or both of the second boundary lines are heated and the valley fold melted portion is formed. Bend at right angles and cure to form sidewalls.
  The surfaces where the connecting pieces come into contact with the first side wall forming plate and the surfaces where the connecting piece comes into contact with the second side wall forming plate are heated to form a welded melted portion, and pressurized and welded.
  The surfaces where the first folded piece and the first side wall forming plate are in contact with each other and the surfaces where the second folded piece and the second side wall forming plate are in contact with each other are heated to form a welded and melted portion, and then pressurize. Weld.
[0004]
  According to the article transport box described in Japanese Patent Application No. 2002-205115, the bent portion of the bottom surface and the side wall can be maintained at a right angle, and the space shape in the article transport box is a highly accurate rectangular parallelepiped. Can do. For this reason, it is possible to accommodate the object to be transported from the bottom to the top of the article transport box without gaps, and there is an effect of transporting the object to be transported without moving and preventing it from rubbing and being damaged. Also, since the molten resin material fixes the bottom forming plate and each side wall forming plate at a right angle at the corner of the valley fold, an external force that pushes and widens the side wall or an external force that curves the bottom plate acts. Even so, it is possible to prevent the bottom and side walls from being bent by this external force. And since the folded piece is superimposed on the upper edge part of the side wall (the part with the opening is the upper part of the box, the upper part of the side wall and the edge part of the side wall constituting the opening), the upper edge part of the side wall Strength is increased and bending can be prevented.
[0005]
[Problems to be solved by the invention]
  However, in the article transport box described in Japanese Patent Application No. 2002-205115, the folding piece is only folded at the boundary line with the side wall forming plate. Neither the outer part that becomes the mountain fold or the inner part that becomes the valley fold is fixed to the bent part. Although the abutting surfaces of the side wall forming plate and the folding piece are welded and fixed, it is difficult to abut the side wall forming plate and the folding piece in the vicinity of the inner part where the valley folds. If it does, distortion will arise in the upper edge part of a side wall, Therefore The vicinity of the inner part used as a valley fold cannot be fixed. Therefore, the conventional article carrying box has a first problem in that the strength of the upper edge portion of the side wall is not yet sufficient.
  Further, since the vicinity of the inner portion that becomes the valley fold between the side wall forming plate and the folding piece is not fixed, a portion that bulges out roundly due to the restoring force of the box forming material is generated on the outer side that becomes the mountain fold. . If the cross-sectional shape of the upper edge portion of the side wall is deformed into a rounded shape, it is difficult to ensure the dimensional accuracy of the upper edge portion, and there is a possibility that a gap may be formed between the box lid body. Therefore, the conventional article transport box has a second problem in that dust may enter from a gap with the box lid to contaminate the object to be transported.
  Further, in the conventional article carrying box, the bent portion that is bent at the boundary line between the side wall forming plate that forms the side wall and the connecting piece is fixed to both the outer portion that becomes the mountain fold and the inner portion that becomes the valley fold. Not. The bent portion in the height direction of the box formed between the adjacent side walls cannot be maintained at a right angle due to the restoring force of the box forming material or the external force that opens the bent portion, and opens. In addition, when an external force is applied in the height direction of the box, an action of opening the bent portion occurs. Therefore, in the conventional article carrying box, it is difficult to secure the dimensional accuracy of the box body by opening a bent portion in the height direction of the box body, and there is a possibility that a gap is generated between the box and the box lid body. There is a third problem in that the strength in the height direction drops sharply and the box body is likely to buckle.
  Furthermore, in the conventional article transport box, each pair of side wall forming plates is extended to the opposite edge portions of the bottom forming plate. When forming and folding a valley fold melted portion on the boundary line between the bottom forming plate and the side wall forming plate, first, the side wall forming plate extended to a pair of opposite edges of the bottom forming plate is bent, and then Then, the side wall forming plate extended to the other pair of opposite edges is bent. When performing the subsequent folding, the side wall forming plate is folded by the first folding. The folded side wall forming plate is melted by heat and damaged when the valley fold heating portion forming the valley fold melting portion for subsequent folding approaches. For this reason, the valley heating part which forms a valley folding part cannot use the thing longer than the length of the boundary line of a bottom formation board and a side wall formation board. Therefore, in the case of the conventional article carrying box, when a valley fold melted portion is formed on the boundary line between the bottom forming plate and the side wall forming plate and bent, a dedicated valley folding heating adapted to the dimensions of the box body is performed. There is a fourth problem in that the valley fold heating section used in the box of other dimensions cannot be used in common.
[0006]
  The present invention has been made in view of the above-mentioned problems, and a first object is to provide an article carrying box in which the strength of the upper edge portion of the side wall is sufficient.
  A second object is to provide an article transport box that ensures the dimensional accuracy of the upper edge portion, forms a box that does not create a gap with the box lid, and prevents contamination of the object to be transported. It is.
  The third purpose is to prevent the folds in the height direction of the box from opening, to ensure the dimensional accuracy of the box, to prevent a gap from being formed between the box cover and the height. The object is to provide a box for transporting articles that secures strength and increases strength against buckling of the box.
  The fourth purpose is to eliminate the need to use a dedicated valley heating unit adapted to the dimensions of the box when bending and forming a valley folding portion on the boundary line between the bottom forming plate and the side wall forming plate. Another object of the present invention is to provide an article carrying box having a box that can be used in common with a valley fold heating unit used in a box of other dimensions.
[0007]
[Means for Solving the Problems]
  In order to achieve the above object, according to the first aspect of the present invention, the box body (1) having an opening formed in the upper part and the opening formed on the upper part is formed by assembling and forming a box body formed of a foamed polypropylene resin plate as a box forming material. A box lid (2) for closing the part,Forming a side wall that constitutes a side wall in an article transporting box having a configuration in which a welded and melted portion is formed by heating on the boundary line of the valley-folded surface, and the valley-folded melted portion is cured by bending at the boundary line of the valley-folded surface. An upper edge forming piece is extended to the upper edge portion of the plate, a folding piece is extended to the upper edge forming piece, and the upper edge forming piece and the folding are formed on the outer surface side of the side wall of the box (1). The tatami piece is folded, and the side wall forming plate and the foldable piece are welded to each other at the upper part of the side wall, and the upper edge and the upper edge of the side wall forming plate and the upper edge forming plate are welded. Article conveyance characterized in that the strength of the upper edge portion of the side wall and the dimensional accuracy of the box (1) are secured as a configuration in which the valley fold melted portion is cured on the boundary line between the formed piece and the folded piece. A box was used.
  Here, the foamed polypropylene resin plate is a plate-like material in which a low-foam, medium-foam, and high-foam foam made of polypropylene resin is sandwiched between plate bodies made of polypropylene resin. Further, the upper edge portion is an edge portion of the side wall that constitutes the upper portion of the side wall and the opening portion, with the portion having the opening portion positioned above the box (1). And an opening part is a box cover body in the opening part of the box body (1) in the box for goods conveyance in which the box body (1) and the box cover body (2) were formed separately, and a part of the box body (1). (2) includes an opening in the article transport box that is connected and formed.
[0008]
  In the invention according to claim 2, the box body development formed body comprises a first box body development formed body (10) and two second box body development formed bodies (20), and the first box body development formed body. For the formed body (10), the side wall forming plate is the first side wall forming plate (12), the upper edge forming piece is the first upper edge forming piece (15), and the folding piece is the first folding piece (16), The first box body forming body (10) has a bottom forming plate (11), and a pair of opposing edges of the first side wall forming plate (12) and the other of the bottom forming plate (11). It is set as the structure which extended the bottom part connection piece (13) in the edge part, and the 2nd box expansion | deployment formation body (20) is provided with the 2nd side wall formation board (22) as a side wall formation board, and is 2 sheets of 2nd box bodies The second side wall forming plate (22) of the development formed body (20) is opposed to each other, and each second side wall forming plate (22) is adjacent to the first side wall forming plate (12), and the bottom Heating on the first boundary line (121) between the forming plate (11) and the first side wall forming plate (12) and on the bottom boundary line (131) between the bottom forming plate (11) and the bottom connecting piece (13). Then, the valley fold melted portion was formed, and the first side wall forming plate (12) and the bottom connecting piece (13) were bent at a right angle at the first boundary line (121) and the bottom boundary line (131) and cured. 2. An article carrying box according to claim 1, comprising a box (1).It was.
[0009]
  According to a third aspect of the present invention, in the second aspect of the present invention, the side connecting piece (14) is connected to the side edge of the first side wall forming plate (12) via the side boundary line (141). The side boundary line (141) extends from the bottom boundary line (131), the bottom connection piece end (132) of the bottom connection piece (13), and the side part of the side connection piece (14). The connection piece end (142) forms a substantially V-shaped cut, and the tip of the substantially V-shaped cut coincides with the end of the first boundary line (121). The upper edge forming piece is the second upper edge forming piece (25), the folding piece is the second folding piece (26), and the bottom and side edges of the second side wall forming plate (22) are respectively While facing the bottom connection piece (13) and the side connection piece (14) of the first box body development forming body (10), the opposing surfaces are Heat, and the article transport box according to claim 2, characterized in that it has a box (1) which is assembled formed by welding by pressurizing means.
[0010]
  Therefore, in the first aspect of the present invention, the box (1) constituting the article transport box is formed by assembling and forming a box body forming body using a foamed polypropylene resin plate as a box forming material and having an opening at the top. An upper edge forming piece extending at an upper edge portion of the side wall forming plate constituting the side wall of the box (1), and a folding piece extending from the upper edge forming piece. The valley forming side surface for folding the upper edge forming piece with respect to the side wall forming plate, and the valley folding side surface for bending the folding piece with respect to the upper edge forming piece. Heating the boundary line between the edge forming piece and the boundary line between the upper edge forming piece and the foldable piece to form a valley fold melted portion, and heating the surfaces where the side wall forming plate and the foldable piece face each other To form a welded melted portion, and the upper edge forming piece and the foldable piece are bent at the boundary line to cure the valley fold melted portion. And Rutotomoni sidewall forming plate and folded piece fusing surface mutually facing.
[0011]
  In the invention according to claim 2, in the invention according to claim 1,
  The box body forming body includes a first box body forming body (10) including a bottom forming plate (11) and a first side wall forming plate (12), and a second side wall forming plate (22). It is composed of two second box expansion formation bodies (20), and has a box body (1) that is formed by assembling and forming a box expansion formation body and having an opening in the upper part.
  A first side wall forming plate (12) is extended to a pair of opposing edges of the bottom forming plate (11), and a bottom connecting piece (13) is extended to another opposing edge of the bottom forming plate (11). Has been established,
  On the first boundary line (121) between the bottom forming plate (11) and the first side wall forming plate (12) and on the bottom boundary line (131) between the bottom forming plate (11) and the bottom connecting piece (13). Is heated to form a valley fold melted portion, and the first side wall forming plate (12) and the bottom connecting piece (13) are bent at a right angle between the first boundary line (121) and the bottom boundary line (131), and cured. Let
[0012]
  In the invention according to claim 3, in the invention according to claim 2,
  In the first box body forming body (10), a first side wall forming plate (12) is extended to a pair of opposing edges of the bottom forming plate (11), and a bottom connecting piece is formed on the other opposing edge. (13) is extended, a first upper edge forming piece (15) is extended to an upper edge portion of the first side wall forming plate (12), and an edge of the first upper edge forming piece (15) is provided. A first folding piece (16) is extended, and a side connection piece (14) is extended to a side edge of the first side wall forming plate (12),
  The side boundary line (141) is formed on an extension line of the bottom boundary line (131), and a notch that is substantially V-shaped is formed at the bottom connecting piece end (132) and the side connecting piece end (142). The tip of the substantially V-shaped notch is aligned with the end of the first boundary line (121),
  The second box body forming body (20) has a second upper edge forming piece (25) extending on an upper edge portion of the second side wall forming plate (22), and the second upper edge forming piece (25). A second folding piece (26) is extended at the edge,
  On the first boundary line (121) between the bottom forming plate (11) and the first side wall forming plate (12), on the bottom boundary line (131) between the bottom forming plate (11) and the bottom connecting piece (13), And the first side wall forming plate (12) and the side boundary line (141) between the side portion connecting pieces (14) are heated to form a valley fold melting portion,
  The first side wall forming plate (12) is perpendicular to the first boundary line (121), the bottom connection piece (13) is the bottom boundary line (131), and the side connection piece (14) is perpendicular to the bottom boundary line (131). Bend and harden into
  The upper edge forming piece is bent with respect to the side wall forming plate, the folding piece is bent with respect to the upper edge forming piece, and the first side wall forming plate (12) and the first folding piece (16) face each other. And the surfaces where the second side wall forming plate (22) and the second folded piece (26) face each other are welded,
  The bottom edge portion and the side edge portion of the second side wall forming plate (22) are opposed to the bottom connection piece (13) and the side connection piece (14) of the first box body development forming body (10), respectively. At the same time, the opposing faces are welded and formed by heating and pressing means.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
  An embodiment embodying the present invention will be described with reference to FIGS.
[0014]
  An article carrying box according to the present embodiment includes a box 1 having a size of 380 × 380 × 230 (mm) using a medium foamed polypropylene resin plate having a thickness of 2.5 mm as a box forming material, This is an article carrying box having a box lid 2 that closes an upper opening. The box body 1 is formed by assembling a first box body development forming body 10 and two second box body development forming bodies 20, and the box lid body 2 is formed by assembling a box lid body development forming body 30. Is.
[0015]
  FIG. 1 shows the surface of the first box unfolding formed body 10 as the surface of the first box unfolding formed body 10 when the first box unfolding formed body 10 is assembled and formed. It is the shown top view. As shown in FIG. 1, the first box body development formed body 10 has a bottom forming plate 11 constituting the bottom of the box body 1. A quadrangular portion surrounded by the first boundary line 121 and the bottom boundary line 131 constitutes the bottom.
  A first side wall forming plate 12 that constitutes a side wall of the box 1 is extended from the first boundary line 121 that is a pair of side edge portions of the bottom forming plate 11 that face each other. A bottom connecting piece 13 is extended from the bottom side edge that is another pair of side edges of the bottom forming plate 11. The bottom connecting piece 13 is a member for connecting a second side wall forming plate 22 which will be described later that constitutes the side wall of the box body 1. The width of the bottom connecting piece 13 is 40 mm.
  A first upper edge forming piece 15 is extended from the first upper edge boundary line 151 which is the upper edge portion of the first side wall forming plate 12. The first fold piece 16 is extended from the first fold boundary line 161 that is the edge of the first upper edge forming piece 15. The first upper edge forming piece 15 and the first folding piece 16 are members that increase the strength of the upper edge portion of the first side wall forming plate 12. The upper edge portion and the upper edge portion are the upper edge portion of the side wall and the edge portion of the side wall constituting the opening portion, with the opening portion being above the box body 1.
A side connection piece 14 is extended from the side boundary line 141 that is a side edge of the first side wall forming plate 12. The side connection piece 14 is a member for connecting the first side wall forming plate 12 and the second side wall forming plate 22 described later in assembling the box body 1. The width of the side connecting piece 14 is 40 mm. The side boundary line 141 of the first side wall forming plate 12 is formed on an extension line of the bottom boundary line 131 of the bottom forming plate 11.
[0016]
  In the first box unfolding formed body 10 shown in FIG. 1, the bottom connecting piece 13 is formed to extend from the bottom boundary line 131, and is connected to the extension of the side boundary line 141 on the extension line of the bottom boundary line 131. A piece 14 is formed. The end of the bottom connecting piece 13 and the bottom connecting piece 13 of the side connecting piece 14 are adjacent to the end of the hook. The end of the bottom connecting piece 13 is referred to as a bottom connecting piece end 132, and the end of the side connecting piece 14 adjacent to the bottom connecting piece end 132 is referred to as a side connecting piece end 142. The shape of the bottom connecting piece end 132 is formed in an acute angle with the bottom boundary line 131, and the angle is 45 degrees. The side connecting piece end 142 is formed in an acute angle with the side boundary line 141, and the angle is 45 degrees. For this reason, the bottom part connecting piece end part 132 and the side part connecting piece end part 142 form a notch that is substantially V-shaped. The angle between the bottom connecting piece end 132 and the side connecting piece end 142 is a right angle. The tip of the substantially V-shaped cut coincides with the end of the first boundary line 121. The substantially V-shaped cuts are formed at four locations where the bottom connecting piece end 132 and the side connecting piece end 142 are adjacent.
[0017]
  Next, the 2nd box body expansion formation body 20 shown in FIG. 2 is demonstrated. FIG. 2 shows the surface of the second box unfolded formed body 20 as the surface of the second box unfolded formed body 20 as the surface of the second box unfolded formed body 20 when the second box unfolded formed body 20 is assembled and formed. It is the shown top view. The illustrated second box body forming body 20 is one of the two second box body forming bodies 20. The two second box body forming bodies 20 have the same shape. The second box body forming member 20 has a second side wall forming plate 22. The second side wall forming plate 22 is connected to the bottom forming plate 11 and the first side wall forming plate 12 to constitute the side wall of the box 1. A second upper edge forming piece 25 is extended to the outside of the second upper edge boundary line 251 which is the upper edge portion of the second side wall forming plate 22. A second folding piece 26 is extended to the outside of the second folding boundary line 261 that is the edge of the second upper edge forming piece 25. The second upper edge forming piece 25 and the second folding piece 26 are members that increase the strength of the upper edge portion of the second side wall forming plate 22. The second upper edge forming piece 25 and the second folding piece 26 are formed shorter than the entire length of the upper edge portion of the second side wall forming plate. When the second side wall forming plate 22 and the first side wall forming plate 12 are connected to each other with a length 40 mm shorter than both ends of the upper edge portion of the second side wall forming plate 22, the second upper edge forming piece 25 and the second The folding piece 26 is prevented from interfering with the side connecting piece 14.
[0018]
  Next, the box lid development body 30 shown in FIG. 3 will be described. FIG. 3 shows the surface of the box lid deployment formed body 30 with the surface that becomes the inner surface of the box lid 2 formed when the box lid deployed deployment body 30 is assembled and formed as the surface of the box lid deployment deployment body 30. It is a top view. The box lid development forming body 30 includes a lid forming plate 31 that constitutes the top of the box lid 2. A quadrangular portion surrounded by the first lid boundary line 321 and the second lid boundary line 331 constitutes the top. A first lid side plate 32 that constitutes a side wall of the box lid body 2 is extended from a first lid boundary line 321 that is a pair of side edge portions of the lid forming plate 31 that face each other. A second lid side plate 33 is extended to the outside of a second lid boundary line 331 which is another pair of opposite side edges of the lid forming plate 31. Further, lid side plate connecting pieces 34 are extended at both ends of the second lid side plate 33. The lid side plate connecting piece 34 is a member for connecting the first lid side plate 32 and the second lid side plate 33 constituting the side wall of the box lid 2.
[0019]
  The first box body forming body 10, the two second box body forming bodies 20, and the box lid body forming body 30 are formed in a first box body using a cutting means for a medium foamed polypropylene resin plate. The formed body 10, the second box body development body, and the box lid body development body 30 are cut into respective contour shapes. As the cutting means, for example, a known cutting means such as a punching blade or a thermal tooth mold can be used.
[0020]
  Next, the assembly formation of the box body 1 by the first box body forming body 10 and the two second box body forming bodies 20 will be described.
[0021]
  FIG. 4 is a perspective view of the back surface of the first box body development formed body 10. In the first box body forming body 10 shown in FIG. 4, the first upper edge forming piece 15 is bent with respect to the first side wall forming plate 12, and the first folding piece 16 with respect to the first upper edge forming piece 15. Is folded. The first upper edge forming piece 15 is bent at the first upper edge boundary line 151, and the first folding piece 16 is bent at the first folding boundary line 161. The distance between the first upper edge boundary line 151 and the first folding boundary line 161 is 5.0 mm. As for the 1st upper edge formation piece 15 and the 1st folding piece 16, the back surface of the 1st box expansion | deployment formation body 10 is bend | folded by a side. A ruled line or line for forming a crease other than forming a valley fold melted portion on the first upper edge boundary line 151 and the first fold boundary line 161 on the back surface of the first box body forming body 10. There is no need to form a compressed portion or the like.
[0022]
  On the first upper edge boundary line 151 and the first folding boundary line 161, a valley fold melting portion is formed. The valley folding portion is formed on the surface on the valley folding side where the first folding piece 16 is folded. As shown in FIG. 15, which is a cross-sectional view taken along the line AA of FIG. 4, the cross-sectional shape of the valley fold melted portion is wide at the outside of the box forming material and narrow at the inside. When the first upper edge forming piece 15 is bent at a right angle with respect to the first side wall forming plate 12, the width of the valley fold melting portion outside the box forming material is The dimensions are such that the surrounding unmelted parts do not hit each other. In the case of this embodiment in which the thickness of the box forming material is 2.5 mm, the width of the valley fold melted portion is 2.5 mm. The depth of the valley folding portion is about half of the thickness of the box forming material. The valley fold melted part is formed by melting the foamed polypropylene resin plate and the foam. The valley folding part is formed only on the face on the valley folding side and is not melted to the plate on the opposite side. Further, the first upper edge forming piece 15 sandwiched between the two valley fold melting portions is not melted by heat.
[0023]
  The first fold boundary line 151 and the first folding boundary line are formed as the valley melting part forming means 50 for forming the valley melting part on the first upper boundary line 151 and the first folding boundary line 161. 161 can be used to bring the valley heating section 51 into contact with it. As shown in FIG. 16, the valley fold heating unit 51 has a wedge-shaped cross-sectional shape. Moreover, the valley folding heating part 51 has the structure which can maintain the high temperature state more than melting | fusing point of a polypropylene resin by incorporating a heat generating body or heating from the outside. The valley fold heating part 51 heated on the boundary line contacts and a valley fold melting part is formed. In the valley fold heating unit 51 shown in FIG. 16, the valley fold heating unit 51 contacts the boundary line with respect to the first box body development formed body 10 set at a predetermined position, and the predetermined time elapses on the boundary line. It is the structure operated so that it may leave | separate after forming a valley folding part. In the valley fold melting portion forming means 50, the sectional shape of the valley fold heating portion 51 is wedge-shaped, and the valley fold melting portion 51 is formed by contacting the valley fold heating portion 51 for each boundary line.
[0024]
  As shown in FIG. 17, the valley fold melted part forming means 50 in which two valley fold heating parts 51 that heat the first upper edge boundary line 151 and the first fold boundary line 161 at the same time are arranged in parallel. You may make it use. As shown in FIG. 18 which is a CC cross section of FIG. 17, the valley fold heating unit 51 can have a wedge-shaped cross section. The valley fold heating part 51 may be provided with two parallel bars having a wedge-shaped cross section, and the two valley fold heating parts 51 may be integrally formed.
[0025]
  Next, in order to weld the surfaces where the first side wall forming plate 12 and the first folding piece 16 face each other, a welded melt portion is formed at a portion where both surfaces abut. As shown in FIG. 19, in the 1st folding piece 16, it is set as the range which does not melt the part of the fixed width of a peripheral part, and the part enclosed by this range is made into a welding fusion part. Since the range not melted is for preventing the melted resin from protruding, it is preferable that the range not melted be as narrow as possible. The welded melted part is formed by the welded melted part forming means 60. In the 1st side wall formation board 12, when the 1st folding piece 16 is bent, a welding fusion part is formed in the part contact | abutted with the welding fusion part of the 1st folding piece 16. FIG.
[0026]
  As the weld melt portion forming means 60 for forming the weld melt portion, a means for bringing the welding heating portion 61 into contact with the box forming material can be used. As shown in FIG. 19, the welding heating part 61 has a surface which contacts a box formation raw material in a longitudinal direction. The welding heating part 61 is a surface having the same shape as the welding and melting part formed on the first folded piece 16 and the welding and melting part formed on the first side wall forming plate 12. Further, the welding heating part 61 has a configuration in which a heating element is built in or can be maintained at a high temperature above the melting point of the polypropylene resin by being heated from the outside. The welding heating unit 61 comes into contact with and melts the first side wall forming plate 12 and the first folding piece 16. The welding heating unit 61 heats and melts the first folded piece 16 and the valley folded surface side of the first side wall forming plate 12. 19, the welding heating part 61 comes into contact with the first folded piece 16 with respect to the set first box body 10 and the predetermined time has passed. It is the structure operated so that it may leave | separate after forming the welding fusion | melting part on the folding piece 16. FIG. Similarly, the welding heating unit 61 comes into contact with the first side wall forming plate 12 and is operated so as to be separated after a predetermined time has elapsed and a welding and melting portion is formed on the first side wall forming plate 12. In this welding / melting part forming means 60, the fusion heating part 61 is individually brought into contact with the folded piece and the first side wall forming plate 12 to form a melted part.
[0027]
  In the welding melted part forming means 60 shown in FIG. 20, a welding heating part 61 for forming a welding melted part on the first folded piece 16 and a welding heating part 61 for forming a welded melted part on the first side wall forming plate 12 are provided. Have. As shown in FIG. 20, two welding heating portions 61 may be arranged in parallel. The welding heating unit 61 may be provided with separate welding heating units 61 arranged in parallel, or may be integrally formed. In the welding / melting part forming means 60 shown in FIG. 20, the welding heating part 61 is simultaneously brought into contact with the first side wall forming plate 12 and the folded piece to simultaneously form a melted part.
[0028]
  The heating unit 40 shown in FIG. 21 has a valley fold melted part forming unit 50 and a welded melted part forming unit 60. The valley fold melting portion forming means 50 has two valley fold heating portions 51 for forming valley fold melting portions on the first upper edge boundary line 151 and the first fold boundary line 161 in parallel. 22, which is a DD cross section of FIG. 21, the welding / melting part forming means 60 includes a welding heating part 61 for forming a welding / melting part on the first folded piece 16, and the first side wall forming plate 12. And a welding heating part 61 for forming a welded melt part. That is, it is the structure by which the valley folding heating part 51 which forms a valley folding melting part on a boundary line was arranged in parallel two, and the welding heating part 61 was arranged in parallel so that this might be pinched | interposed. In this heating means 40, the two valley heating parts 51 are brought into contact with the boundary line, and at the same time, the two welding heating parts 61 are brought into contact with the first side wall forming plate 12 and the first folding piece 16. A valley-folded melted portion is formed on the boundary line, and a welded melted portion is formed at the same time.
[0029]
  As shown in FIG. 5, the first upper edge forming piece 15 is bent with respect to the first side wall forming plate 12, and the first folding piece 16 is bent with respect to the first upper edge forming piece 15. The first upper edge forming piece 15 and the first folding piece 16 are bent by forming a valley fold melting portion on the first upper edge boundary line 151 and the first folding boundary line 161, 16 and the first side wall forming plate 12 are formed in a state where a welded and melted portion is formed. The first upper edge boundary line 151 is bent at a right angle. The outer first folding boundary line 161 is folded and folded until the first folding piece 16 comes into contact with the first side wall forming plate 12. The valley fold melted portion on the first fold boundary line 161 is cured at a right angle. As shown in FIG. 23, a corner portion forming die 70 is used to hold the valley fold melted portion on the first upper edge boundary line 151 in a right angle state. The corner portion forming die 70 is brought into contact with a surface of the first upper edge boundary line 151 on the mountain fold side. In this state, the valley folded melt portion is cured. As will be described later, the valley fold melting portion on the first fold boundary line 161 is cured in a state where the first fold piece 16 is pressed against the first side wall forming plate 12.
[0030]
  In the state where the first upper edge forming piece 15 and the first folding piece 16 are folded as described above, the first folding piece 16 is simultaneously applied to the first side wall forming plate 12 as indicated by arrows in FIGS. Press against. The surfaces where the first side wall forming plate 12 and the first folded piece 16 face each other are formed with a welded melted portion melted by the welded melted portion forming means 60, and the welded melted portion of the first folded piece 16 and The welded and melted portion of the first side wall forming plate 12 is brought into close contact. In this state, the welded and melted portion is cured, and the first side wall forming plate 12 and the first folded piece 16 are welded.
[0031]
  Next, FIG. 6 is a perspective view of the surface of the first box body forming body 10, and the bottom connecting piece 13 is bent with respect to the bottom forming plate 11 in the state shown in FIG. 6. Further, the side connecting piece 14 is bent with respect to the first side wall forming plate 12. The bottom connecting piece 13 and the side connecting piece 14 are bent to the same side. The bottom connecting piece 13 is bent at the bottom boundary line 131 between the bottom forming plate 11 and the bottom connecting piece 13, and the side connecting piece 14 is connected at the side boundary line 141 between the first side wall forming plate 12 and the side connecting piece 14. It can be bent. The surface of the first folded box body 10 shown in FIG. Accordingly, the bottom connecting piece 13 and the side connecting piece 14 folding piece are folded to the side of FIG. It is not necessary to form a ruled line for forming a crease, a line-shaped compressed portion, or the like other than forming a valley fold melting portion described later on the bottom boundary line 131 and the side boundary line 141.
[0032]
  A valley melting portion is formed on the bottom boundary line 131 and the side boundary line 141. The valley melting portion is formed on a surface on the valley fold side where the bottom connecting piece 13 and the side connecting piece 14 are bent. The cross-sectional shape of the melted portion of the valley fold is the valley fold formed on the first upper edge boundary line 151 and the first folding boundary line 161 when the first upper edge forming piece 15 and the first folding piece 16 are bent. The shape is the same as the molten part. That is, as shown in FIG. 25, which is a BB cross-sectional view of FIG. 6, the width is wide outside the box forming material and narrow inside. When the bottom connecting piece 13 is bent at a right angle with respect to the bottom forming plate 11, the width of the valley folding portion outside the box forming material is melted around the valley folding portion on the face on the valley folding side. The dimensions are such that the parts that do not touch each other. In the case of this embodiment in which the thickness of the box forming material is 2.5 mm, the width of the valley fold melted portion is 2.5 mm. The depth of the valley folding portion is about half of the thickness of the box forming material. The valley fold melted part is formed by melting the foamed polypropylene resin plate and the foam. The valley folding part is formed only on the face on the valley folding side and is not melted to the plate on the opposite side. Since it is the same also about the valley melting part on the side part boundary line 141, description is abbreviate | omitted.
[0033]
  As the valley fold melting portion forming means 50 for forming the valley fold melting portion on the bottom boundary line 131 and the side boundary line 141, a means for bringing the valley heating portion 51 into contact with the boundary line can be used. As shown in FIG. 26, the valley folding heating part 51 has a wedge-shaped cross-sectional shape. Moreover, the valley folding heating part 51 has the structure which can maintain the high temperature state more than melting | fusing point of a polypropylene resin by incorporating a heat generating body or heating from the outside. The valley folding heating part 51 contacts on a boundary line, and a valley folding melting part is formed. In the valley fold heating unit 51 shown in FIG. 26, the valley fold heating unit 51 contacts the boundary line with respect to the first box body development formed body 10 set at a predetermined position, and the valley fold melting occurs after a predetermined time elapses. It is the structure operated so that it may leave | separate after forming a part. In the valley fold melting portion forming means 50, the sectional shape of the valley fold heating portion 51 is wedge-shaped, and the valley fold melting portion 51 is formed by contacting the valley fold heating portion 51 for each boundary line.
[0034]
  In the first box body forming body 10, there is a side boundary line 141 on an extension line of the bottom boundary line 131. Therefore, the valley fold heating unit 51 is simultaneously brought into contact with the bottom boundary line 131 and the side boundary line 141 using the valley fold melting portion forming means 50 having a long and straight linear shape. And the valley fold melted portion can be formed simultaneously. The total length of the valley fold heating unit 51 is longer than the sum of the lengths of the bottom boundary line 131 and the two side boundary lines 141, so that the valley fold melted portion is formed on the bottom boundary line 131 and the side boundary line 141. Can be formed simultaneously. In this embodiment, the valley fold heating portion 51 of the valley fold melting portion forming means 50 is simultaneously contacted on the bottom boundary line 131 and the two side boundary lines 141 on the right side of FIG. Form at the same time. Next, the valley folding part 51 is simultaneously brought into contact with the bottom boundary line 131 and the two side boundary lines 141 on the left side of the drawing to simultaneously form the valley folding part.
[0035]
  The bottom connecting piece 13 is bent with respect to the bottom forming plate 11, and the side connecting piece 14 is bent with respect to the first side wall forming plate 12. Bending of the bottom connecting piece 13 and the side connecting piece 14 is performed in a state in which a valley fold melting portion is formed on the bottom boundary line 131 and the side boundary line 141. The bottom connecting piece 13 and the side connecting piece 14 are bent at a right angle, and the valley fold melted portion is cured at a right angle. As shown in FIG. 27, a corner forming die 70 is used to hold the valley fold melted portion on the bottom boundary line 131 in a right angle state. The corner portion forming die 70 is brought into contact with the corner portion from the surface of the bottom boundary line 131 on the mountain fold side. In this state, the valley folded melt portion is cured. The valley crease on the side boundary line 141 is similarly bent at a right angle, and the valley fold melted portion is cured in a right angle state.
[0036]
  Next, in the state shown in FIG. 7, the first side wall forming plate 12 is bent with respect to the bottom forming plate 11. The first side wall forming plate 12 is bent at the first boundary line 121. The surface of the first folded box body 10 shown in FIG. It is not necessary to form a ruled line for forming a crease, a linear compressed portion, or the like other than forming a valley fold melting portion described later on the first boundary line 121.
[0037]
  A valley melting portion is formed on the first boundary line 121. The valley folding portion is formed on a surface on the valley folding side where the first side wall forming plate 12 is folded. The cross-sectional shape of the valley fold melted portion is the same as that of the valley fold melted portion formed on the first fold boundary line 161 when the first fold piece 16 is bent, and thus detailed description thereof is omitted.
  Further, as the valley fold melted portion forming means 50 for forming the valley fold melted portion on the valley fold, a means for bringing the valley fold heating unit 51 into contact with the valley fold can be used. In the present embodiment, a valley-melting portion forming means 50 in which valley-melting portions are formed on the bottom boundary line 131 and the side boundary line 141 is used. Therefore, description of the valley fold melted part forming means 50 is omitted here.
[0038]
  As shown in FIG. 28, the bottom connecting piece 13 and the side connecting piece 14 are bent at right angles to the bottom forming plate 11 and the first side wall forming plate 12, respectively. The direction of bending is the same as the direction of bending the first side wall forming plate 12. Accordingly, the bottom connecting piece 13 and the side connecting piece 14 are bent on the face on the valley fold side where the first side wall forming plate 12 is bent. The bottom connecting piece end 132 and the side connecting piece end 142 form a notch that is substantially V-shaped. The angle between the bottom connecting piece end 132 and the side connecting piece end 142 is a right angle. The front end of the substantially V-shaped notch coincides with the end of the first boundary line 121. In addition, the substantially V-shaped notches are formed at four locations where the bottom connecting piece end 132 and the side connecting piece end 142 are adjacent to each other, so that the substantially V-shaped notches are formed at both ends of the first boundary line 121. Yes.
[0039]
  As shown in FIG. 28, the length of the valley fold heating part 51 of the valley fold melted part forming means 50 used in this embodiment is longer than the length of the first boundary line 121. Therefore, the valley heating part 51 intersects the bent bottom connecting piece 13 and the side connecting piece 14. However, the bottom connecting piece end 132 and the side connecting piece end 142 form a notch that is substantially V-shaped. Due to the substantially V-shaped cut, the valley folding heating part 51 can contact the first boundary line 121 without contacting the bottom coupling piece 13 and the side coupling piece 14, and the valley folding on the first boundary line 121. A molten portion can be formed.
[0040]
  As shown in FIG. 28, the first side wall forming plate 12 is bent with respect to the bottom forming plate 11. The first side wall forming plate 12 is bent in a state in which a valley fold melting portion is formed on the first boundary line 121. The first side wall forming plate 12 is bent at a right angle with respect to the bottom forming plate 11. The valley melted part on the first boundary line 121 is cured at a right angle. In order to hold the valley-folded melted portion on the first boundary line 121 in a right angle state, the corner portion forming die 70 is used similarly to the bending of the connecting piece. The corner portion forming mold 70 is brought into contact with the corner portion from the surface of the first boundary line 121 on the mountain fold side. In this state, the valley folded melt portion is cured.
[0041]
  Next, the bending of the second upper edge forming piece 25 and the second folding piece 26 of the second box unfolding formed body 20 will be described.
  FIG. 9 is a perspective view of the back surface of the second box body development formed body 20. The second upper edge forming piece 25 is bent with respect to the second side wall forming plate 22, and the second folding piece 26 is bent with respect to the second upper edge forming piece 25. The second upper edge forming piece 25 is bent at the second upper edge boundary line 251, and the second folding piece 26 is bent at the second folding boundary line 261. The distance between the second upper edge boundary line 251 and the second folding boundary line 261 is 5.0 mm. The face on the valley fold side is the back side of the second box body forming body 20 in FIG. On the face of the valley fold side, a valley fold melting portion is formed on the second upper edge boundary line 251 and the second fold boundary line 261, and a ruled line for forming a crease, a linear compression portion, etc. There is no need to form.
[0042]
  A valley-melting portion is formed on the second upper edge boundary line 251 and the second folding boundary line 261. The valley folding portion is formed on the surface on the valley folding side where the second folding piece 26 is folded. Since the cross-sectional shape of the valley fold melted portion is the same as the valley fold melted portion formed on the first upper edge boundary line 151 in the bending of the first upper edge forming piece 15 of the first box body development formed body 10, Detailed description is omitted.
[0043]
  Moreover, the valley fold melting part formation means 50 which forms a valley fold fusion part on the 2nd upper edge boundary line 251 and the 2nd folding boundary line 261 uses the means which makes the valley fold heating part 51 contact on a boundary line. In the folding of the first upper edge forming piece 15 and the first folding piece 16 of the first box unfolding and forming body 10, similar to the valley folding part forming means 50 for forming a valley folding part on the boundary line Therefore, detailed description is omitted.
[0044]
  Next, in order to weld the surfaces where the second side wall forming plate 22 and the second folding piece 26 face each other, a welded melt portion is formed at a portion where both surfaces abut. In the 2nd folding piece 26, let the part of the fixed width of a peripheral part be a range which is not fuse | melted, and the part enclosed by this range is fuse | melted and it is set as a welding fusion | melting part. Since the range not melted is for preventing the melted resin from protruding, it is preferable that the range not melted be as narrow as possible. The welded melted part is formed by the welded melted part forming means 60. In the second side wall forming plate 22, when the second folded piece 26 is folded, a welded and melted portion is formed at a portion that contacts the welded and melted portion of the second folded piece 26.
  A means for bringing the welding heating part 61 into contact with the box forming material can be used as the welding melted part forming means 60 for forming the welded melted part on the second folding piece 26 and the second side wall forming plate 22. The welding and melting part forming means 60 is the same as the welding and melting part forming means 60 used in welding the first folded piece 16 and the first side wall forming plate 12 of the first box unfolding and forming body 10, and thus detailed. Description is omitted.
[0045]
  The second upper edge forming piece 25 is bent with respect to the side wall forming plate, and the second folding piece 26 is bent with respect to the second upper edge forming piece 25. As for the bending of the second upper edge forming piece 25 and the second folding piece 26, a valley fold melting portion is formed on the second upper edge boundary line 251 and the second folding boundary line 261, and the second folding piece 26 and the second side wall forming plate 22 are performed in a state where a welded and melted portion is formed. The second upper edge boundary line 251 is bent at a right angle. The outer second folding boundary line 261 is folded and folded until the first folding piece 16 contacts the first side wall forming plate 12. The valley fold melted portion on the second fold boundary line 261 is cured at a right angle. In order to hold the valley fold melted part on the second upper edge boundary line 251 in a right angle state, the corner part forming die 70 is used similarly to the first upper edge forming piece 15 and the first folding piece 16 shown in FIG. . The corner portion forming die 70 is brought into contact with a surface of the first upper edge boundary line 151 on the mountain fold side. In this state, the valley folded melt portion is cured. As will be described later, the valley fold melted portion on the second fold boundary line 261 is cured in a state where the second fold piece 26 is pressed against the second side wall forming plate 22.
[0046]
  In the state where the second upper edge forming piece 25 and the second folding piece 26 are bent as described above, the second folding piece 26 is simultaneously pressed against the second side wall forming plate 22. The surfaces where the second side wall forming plate 22 and the second folded piece 26 face each other are formed with a welded melted portion melted by the welded melted portion forming means 60, The welded and fused portion of the second side wall forming plate 22 is brought into close contact. In this state, the welded and melted portion is cured, and the second side wall forming plate 22 and the second folded piece 26 are welded.
[0047]
  As shown in FIG. 11, the box body 1 is formed by connecting the second box body forming body 10 to the assembled first box body forming body 10. As shown in FIG. 12, the bottom forming plate 11 and the first side wall forming plate 12 are connected to the second side wall forming plate 22. The connection is made by welding. The surface of the bottom connecting piece 13 and the lower edge of the back surface of the second side wall forming plate 22 are welded, and the surface of the side connecting piece 14 and the side edge of the back surface of the second side wall forming plate 22 are welded. The The bottom connecting piece 13 and the side connecting piece 14 are welded to the same surface as the surface where the second folding piece 26 is bent at the upper edge portion of the second side wall forming plate 22. However, the second folding piece 26 is formed to be shorter than the entire length of the upper edge portion of the second side wall forming plate 40 and 40 mm from both ends of the upper edge portion of the second side wall forming plate 22.One by oneSince the length is short, the second folding piece 26 and the side connecting piece 14 do not interfere with each other.
[0048]
  The surface where the surface of the bottom connecting piece 13 and the lower edge of the back surface of the second side wall forming plate 22 face each other, the surface of the side connecting piece 14 and the side edge of the back surface of the second side wall forming plate 22 are In order to weld the opposing surfaces to each other, a melted portion is formed at the portion where each surface abuts. Melting is performed by heating each surface, and means such as contact of a heated member or spraying of high-temperature gas can be used.
[0049]
  The surface where the surface of the bottom connecting piece 13 and the lower edge of the back surface of the second side wall forming plate 22 face each other, the surface of the side connecting piece 14 and the side edge of the back surface of the second side wall forming plate 22 are In a state where the opposed surfaces are melted with each other, the lower edge of the second side wall forming plate 22 is pressed against the bottom connecting piece 13, and the side edge of the second side wall forming plate 22 is connected to the side. Press against the piece 14. The melted portions of each surface are in close contact with each other, and the melted portion is cured in this state to weld the bottom connecting piece (13) and the side connecting piece 14 to the second side wall forming plate 22.
[0050]
  Next, the bending of the box lid development body 30 will be described.
  FIG. 13 is a perspective view of the surface of the box lid development body 30. The first lid side plate 32 is bent with respect to the lid forming plate 31 shown in FIG. The first lid side plate 32 is bent at the first lid boundary line 321 with respect to the lid forming plate 31. The surface of the valley fold side is the surface of the box lid development body 30 in FIG. As in the case where the bottom connecting piece 13 is bent with respect to the bottom forming plate 11 in the first box unfolded body 10, the folding is formed at the first lid boundary line 321 and bent at a right angle. You may do it. Further, at the same time as or after the cutting of the box lid unfolding forming body 30, a ruled line for forming a crease, a linear compressed portion, or the like is formed on the first lid boundary line 321, and this is valley-folded. The first lid side plate 32 may be bent with respect to the lid forming plate 31. The second lid side plate 33 is also bent with respect to the lid forming plate 31 in the same manner as the second lid side plate 33.
[0051]
  Next, the lid side plate connecting piece 34 is bent with respect to the second lid side plate 33. As shown in FIG. 14, the lid side plate connecting piece 34 is bent so as to contact the first lid side plate 32. The lid side plate connecting piece 34 is bent so that the surface of the lid side plate connecting piece 34 and the back surface of the first lid side plate 32 are in contact with each other. The surfaces where the lid side plate connecting piece 34 and the first lid side plate 32 face each other are welded and fixed. In order to weld the surfaces where the lid side plate connecting piece 34 and the first lid side plate 32 face each other, a welded melt portion is formed at a portion where both surfaces abut. The lid side plate connecting piece 34 is pressed against the first lid side plate 32 in a state where the welded and melted portion is formed, and the melted portion is cured in this state so that the lid side plate connecting piece 34 and the first lid side plate 32 are bonded. Weld.
[0052]
  This embodiment has the following effects.
(B) The medium-foamed polypropylene resin plate as a box-forming material has a configuration in which a polypropylene resin foam is sandwiched between plates, and thus has high strength against bending. In addition, the strength of the foam is higher than that of the low foamed polypropylene resin plate. High strength can be obtained with a plate thickness comparable to that of a box forming material made of paper cardboard or polypropylene cardboard. Therefore, in the past, in a field where an article transport box using a paper cardboard or polypropylene cardboard box forming material was used, the box forming material was replaced with a medium foamed polypropylene resin plate without changing the size of the article transport box. be able to.
(B) For example, in the case of taking out an object to be transported from an article transport box using an automated take-out device, when the positioning of the operation of the take-out device is performed based on the dimensions of the article transport box, An article transport box having a different size from the conventionally used article transport box cannot be used. However, since the article carrying box using the middle foamed polypropylene resin plate as the box forming material can be made the same size as the conventional article carrying box, it can be used in the automated take-out apparatus.
[0053]
(C) Since a valley fold melted part is formed and bent at the bent part of the box unfolded body, in the cutting of the box unfolded body, a ruled line or a line shape is used to make the bent part a crease by a thermal tooth mold or the like. Therefore, it is not necessary to form the compressed portion, and the number of steps for processing the box body development formed body can be reduced.
[0054]
(D) The first side wall forming plate 12 is extended to a pair of opposing edge portions of the bottom forming plate 11 in the first box unfolding formed body 10, and the bottom connecting piece 13 is formed on the other opposing edge portion. It is extended and the external shape outline shape of the 1st box expansion | deployment formation body 10 is a substantially rectangular shape. For this reason, when cutting the 1st box expansion development body 10 from a box formation raw material, a useless part can be decreased, and the same reason also about the 2nd box body expansion formation body 20 and the box lid expansion body 30 The wasteful part can be reduced. Therefore, the manufacturing cost of the article transport box can be reduced.
[0055]
(E) When bending, the boundary line is heated to form a valley fold melted part, or when welding, the opposing surfaces are heated to form a welded melted part. The heat conductivity is low, and the heat applied to the part to be melted is difficult to conduct to the opposite surface. Therefore, since heat does not conduct to the opposite surface, no distortion occurs due to heat. Moreover, even if shrinkage occurs during curing, the foam absorbs strain, so that no distortion occurs on the opposite surface. For this reason, there is no distortion in the space shape inside the article transport box, and the object to be transported can be accommodated without any gap.
[0056]
(F) The upper edge forming piece sandwiched between the two valley folding portions on the upper edge boundary line and the folding boundary line should not be melted by heat. Therefore, the strength of the upper edge forming piece can be secured, and the strength of the bent portion of the upper edge portion of the side wall can be secured.
[0057]
(G) In folding the upper edge forming piece and the folding piece, the valley fold melting portion forming means 50 in which two valley fold heating portions 51 for heating the upper edge boundary line and the fold boundary line are arranged in parallel is used. As a result, two valley folding portions can be formed simultaneously on the upper edge boundary line and the folding boundary line of the box forming member, so that the box body 1 can be assembled and formed quickly.
(H) Side wall formation by using a welding fusion part forming means 60 in which a welding heating part 61 for forming a welding and melting part on a folded piece and a welding heating part 61 for forming a welding and melting part on a side wall forming plate are provided side by side. The parts where the plates and the folded pieces face each other are melted at the same time, and the assembly and formation of the article transport box is performed quickly.
(I) Two valley fold heating parts 51 forming a valley fold melted part are arranged in parallel on the upper edge boundary line and the folding boundary line, and welding heating parts 61 are arranged in parallel on both sides so as to sandwich this. According to the heating means 40, at the same time as forming a valley fold melted portion on the upper edge boundary line and the folding boundary line, a welded melt portion is formed on the surfaces where the side wall forming plate and the folded piece face each other, thereby conveying the article. Assembling and forming of the box is performed quickly.
[0058]
(Nu) When the upper edge boundary line is bent, the corner-forming mold 70 is used to cure the valley fold melted part in a right angle, thereby restoring the box forming material remaining in the vicinity of the upper edge boundary line. It is possible to prevent the valley-folded melted portion from being cured in a state that is not perpendicular. And the part hardened | cured by hardening the valley fold on a boundary line fixes a side wall formation board, an upper edge formation piece, and a folding piece. The upper edge forming piece can secure the strength of the upper edge portion of the side wall and can ensure the straight state of the upper edge portion. Since the height dimension accuracy of the box body 1 is ensured and the height of the upper edge portion of each adjacent side wall becomes constant, the upper edge portion of the box body 1 when the opening is closed by the box lid body 2 And the box lid 2 can be brought into close contact with each other to eliminate a gap, thereby preventing contamination of the conveyed object.
[0059]
(L) Since the folding piece and the side wall forming plate are welded, even if an external force acts in the direction of bending the upper edge of the side wall, the folding piece and the side wall forming plate do not slide each other, and the upper edge of the side wall The strength of the part is ensured.
[0060]
(V) A side boundary line 141 is present on the extended line of the bottom boundary line 131 of the first box body formed body 10. Therefore, the valley fold heating unit 51 is simultaneously brought into contact with the bottom boundary line 131 and the side boundary line 141 using the valley fold melting portion forming means 50 having a long and straight linear shape. And the valley fold melted portion can be formed simultaneously.
  If the bottom boundary line 131 and the side boundary line 141 are not in a straight line, the bottom fold melting part forming means 50 in which the entire length of the valley fold heating unit 51 is long and straight is used to form the bottom boundary line 131 and the side boundary line. Since the valley folding heating part 51 comes in contact with a part other than the wire 141, it cannot be used. In this case, it is not possible to simultaneously form a valley-melting portion on the bottom boundary line 131 and a valley-melting portion on the side boundary line 141. Further, when the bottom boundary line 131 and the side boundary line 141 are not on a straight line, and when the valley fold melting portion is simultaneously formed on the bottom boundary line 131 and the side boundary line 141, The valley folding part forming means 50 having a dedicated valley folding heating part 51 adapted to the shape of the one-box development forming body 10 must be used.
[0061]
(W) The length of the valley fold heating portion 51 of the valley fold melted portion forming means 50 for forming the valley fold melted portion on the first boundary line 121 is longer than the length of the first boundary line 121. The valley fold heating unit 51 intersects the bottom connecting piece 13 and the side connecting piece 14. However, the bottom connecting piece end 132 and the side connecting piece end 142 form a notch that is substantially V-shaped. Due to the substantially V-shaped cut, the valley folding heating part 51 can contact the first boundary line 121 without contacting the bottom coupling piece 13 and the side coupling piece 14, and the valley folding on the first boundary line 121. A molten portion can be formed. Therefore, it is not necessary to make the length of the valley fold heating part 51 shorter than the length of the first boundary line 121, and a long valley fold having a full length that forms a valley fold melting portion on the bottom boundary line 131 and the side boundary line 141. The heating unit 51 can be used. Furthermore, it is not necessary to use the dedicated valley folding heating part 51 adapted to the dimensions of the box 1, and the valley folding heating part 51 used in the box 1 having other dimensions can be used in common.
[0062]
(F) Since the valley fold melted portions on the bottom boundary line 131 and the side boundary line 141 are held at a right angle and hardened, the box forming material remaining in the vicinity of the bottom boundary line 131 and the side boundary line 141 It is possible to prevent the valley melted portion from being cured in a state where the restoring force is not perpendicular.
(Iv) Since the valley fold melted portion on the side boundary line 141 is hardened in a right angle state, the bent portion in the height direction of the box body 1 formed between the adjacent side walls has a restoring force of the box forming material or Even if an external force is applied to open the bent portion, the right angle state can be maintained. In addition, when an external force is applied in the height direction of the box 1, a right angle state can be maintained even if an action of opening the bent portion occurs. Therefore, the folded portion in the height direction of the box body 1 is not opened, and the dimensional accuracy of the box body 1 can be ensured, and no gap is formed between the box body 2 and the strength in the height direction. Therefore, the strength against buckling of the box body 1 can be increased.
(T) The first side wall forming plate 12 and the second side wall forming plate 22 are fixed to the bottom forming plate 11 in order to hold and cure the valley-melted portion between the bottom boundary line 131 and the side boundary line 141 in a right angle state. It can stand upright at right angles to. The box space can be held in a rectangular parallelepiped, and the strength in the height direction is increased.
[0063]
(L) The outer surface of the edge of the second side wall forming plate 22 and the inner surface of the connecting piece are in contact and welded. Therefore, it is possible to provide an article transport box in which the bottom connecting piece 13, the side connecting piece 14, and the second folding piece 26 do not protrude into the space inside the article transport box, and there is no protrusion in the inner space. it can.
[0064]
  In addition, embodiment is not limited above, For example, you may change as follows.
[0065]
  In addition to a medium foam polypropylene resin plate as a box forming material, a low foam polypropylene resin plate or a high foam polypropylene resin plate can be used. In any case, since the foam of polypropylene resin is sandwiched between plates, the strength against bending is high.
[0066]
  The interval between the upper edge boundary line and the folding boundary line may be widened or narrowed. When the interval between the upper edge boundary line and the folding boundary line is narrowed, the surface where the side wall forming plate and the folding piece abut is increased, and the welding surface can be increased. When the welding surface is increased, the strength of the upper edge portion of the box 1 can be further increased. When the interval between the upper edge boundary line and the folding boundary line is widened, the width of the upper edge portion of the box 1 can be widened, and the straight state of the upper edge portion is ensured and the strength of the upper edge portion is ensured. Can be increased.
[0067]
  A valley fold melted portion is formed on the upper edge boundary line and the folding boundary line, and the upper edge with respect to the side wall forming plate is formed without forming a welded melt portion between the surfaces where the side wall forming plate and the folded piece face each other. The folding piece may be folded. Since the strength of the upper edge portion of the side wall is increased by curing the valley fold melted portion, the welding between the side wall forming plate and the folded piece can be omitted.
[0068]
  In order to simultaneously form a valley folding portion on the bottom boundary line 131 formed on a pair of opposed edges of the bottom forming plate 11, a valley folding portion forming means in which two valley heating portions 51 are arranged in parallel. 50 may be used.
  Further, when two side boundary lines 141 are formed on the extended line of the bottom boundary line 131, the valley heating unit is formed on the pair of bottom boundary lines 131 and the side boundary line 141 on the extended line. Alternatively, a valley fold melted portion forming means 50 in which two valley fold heating portions 51 are arranged in parallel so that 51 can be simultaneously formed may be used. By using this valley fold melted portion forming means 50, a valley fold melted portion can be simultaneously formed on the first boundary line 121 formed on the other pair of opposing edges of the bottom forming plate 11. .
[0069]
  Another folding piece may be extended outside the folding piece in the box development forming body, and the folding piece may be doubled or more and welded to the side wall forming plate. In this case, the strength of the upper edge portion of the side wall forming plate is increased, and when the article transport box is lifted, it becomes easy to put fingers on the folded piece, and an article transport box that can be easily transported can be provided. .
[0070]
  You may make it the inner surface of the edge part of the 2nd side wall formation board 22 contact | abut, and the outer surface of a connection piece contacts and is welded. In this case, it is possible to provide the box 1 having no protrusion on the outer surface.
[0071]
  For the formation of the welded and melted portion, means such as spraying of high-temperature gas can be used in addition to the contact of the heated member.
[0072]
Technical ideas (inventions) other than those described in the claims that can be grasped from the above embodiments will be described below together with the effects thereof.
  In the invention according to any one of claims 1 to 4, the upper edge forming piece is bent at a right angle with respect to the side wall forming plate, and the valley fold melted portion is cured in a right angle state.
  The upper edge forming piece can secure the strength of the upper edge portion of the side wall and can ensure the straight state of the upper edge portion. Since the height dimension accuracy of the box body 1 is ensured and the height of the upper edge portion of each adjacent side wall becomes constant, the upper edge portion of the box body 1 when the opening is closed by the box lid body 2 And the box lid 2 can be brought into close contact with each other to eliminate a gap, thereby preventing contamination of the conveyed object.
[0073]
【The invention's effect】
  As described in detail above, according to the invention described in claims 1 to 4,
  At the upper edge of the side wall, the upper edge forming piece and the folding piece that are extended to the side wall forming plate are bent, and the valley melting portion formed on the boundary line between the upper edge forming piece and the folding piece is cured to form the side wall. By welding the surfaces where the plate and the folding piece face each other, the strength of the upper edge portion of the side wall can be secured, and the dimensional accuracy of the box (1) can be secured, and the box lid (2) When the opening is closed, the upper edge portion of the box (1) and the box lid (2) can be brought into close contact with each other to eliminate the gap, and contamination of the conveyed object can be prevented.
[0074]
  According to the invention described in claim 4, since the valley fold melted portion on the side boundary line (141) is hardened in a right angle state, the height direction of the box (1) formed between the adjacent side walls. The folded portion of can maintain a right angle state even when a restoring force of the box forming material or an external force that opens the folded portion is applied. Further, when an external force is applied in the height direction of the box (1), a right angle state can be maintained even if an action of opening the bent portion is generated. Therefore, the fold in the height direction of the box body (1) is prevented from opening, the dimensional accuracy of the box body (1) is secured, and no gap is formed between the box body (2). In addition, it is possible to provide an article transport box that has a strength in the height direction and an increased strength against buckling of the box (1).
[0075]
  According to the fourth aspect of the present invention, the bottom connecting piece end (132) and the side connecting piece end (142) form a substantially V-shaped notch, and the substantially V-shaped notch is used to heat the valley. The part (51) does not contact the bottom connecting piece (13) and the side connecting piece (14), but can contact the first boundary line (121), and the valley folds on the first boundary line (121). A molten portion can be formed. For this reason, when forming and folding a valley fold melted portion on the boundary line between the bottom forming plate (11) and the side wall forming plate, a dedicated valley folding heating unit (51) adapted to the dimensions of the box (1) is provided. There is no need to use, and it is possible to provide an article carrying box having a box (1) that can be used in common with a valley fold heating section (51) used in a box of other dimensions.
[Brief description of the drawings]
FIG. 1 shows a first box body formation body (10) according to an embodiment of the present invention, and a surface that becomes an inner surface of a box body (1) when the first box body development body (10) is assembled and formed. It is the top view which showed the surface of the 1st box body expansion formation body (10) as a surface of the 1st box body expansion formation body (10).
FIG. 2 is a second box body development formed body (20) according to an embodiment of the present invention, and a surface that becomes the inner surface of the box body (1) when the second box body development formed body (20) is assembled and formed. It is the top view which showed the surface of the 2nd box expansion development body (20) as a surface of a 2nd box body expansion formation body (20).
FIG. 3 is a box lid development formed body (30) according to an embodiment of the present invention, and a surface that becomes the inner surface of the box lid (2) when the box lid development formed body (30) is assembled and formed is a box. It is the top view which showed the surface of the box lid development body (30) as the surface of the lid development body (30).
FIG. 4 is a perspective view of the back surface of the first box body development formed body (10).
FIG. 5 is a perspective view of the back surface of the first box body unfolding body (10) in which the first upper edge forming piece and the first folding piece are folded.
FIG. 6 is a perspective view of the surface of a first box body development formed body (10).
FIG. 7 is a perspective view of the surface of the first box body formed body (10) in which the bottom connecting piece and the side connecting piece are bent.
FIG. 8 is a perspective view of a first box body development formed body (10) in which a first side wall forming plate is bent.
FIG. 9 is a perspective view of the back surface of the second box body development formed body (20).
FIG. 10 is a perspective view of the back surface of the second box body development formed body (20) in which the second upper edge forming piece and the second folding piece are folded.
FIG. 11 is a perspective view of a state before welding a first box body development formed body and a second box body development formed body (20).
FIG. 12 is a perspective view of the box (1) according to the embodiment of the present invention.
FIG. 13 is a perspective view of the surface of a box lid development body (30).
FIG. 14 is a perspective view of a box lid (2) according to the embodiment of the present invention.
15 is a cross-sectional view taken along the line AA in FIG.
FIG. 16 is a perspective view of a valley fold melt portion forming means (50) for forming a valley fold melt portion on a first upper edge boundary line.
FIG. 17 is a perspective view of a valley fold melt portion forming means (50) for forming a valley fold melt portion on the first upper edge boundary line and on the first fold boundary line.
18 is a cross-sectional view taken along the line CC of FIG.
FIG. 19 is a perspective view of a welded and melted part forming means (60) for forming a welded and melted part on the first folded piece.
FIG. 20 is a perspective view of welding / melting part forming means (60) for forming a welding / melting part on the first folding piece and the first side wall forming plate.
FIG. 21 is a perspective view of a heating unit (40) having a valley fold melted part forming unit and a welded melted part forming unit.
22 is a sectional view taken along the line DD of FIG. 21. FIG.
FIG. 23 is a perspective view of a state in which the first upper edge forming piece and the first folding piece are bent and brought into contact with the corner portion forming mold (70).
24 is a cross-sectional view taken along line EE in FIG. 23. FIG.
25 is a cross-sectional view taken along the line BB in FIG.
FIG. 26 is a perspective view of a valley fold melt portion forming means (50) for forming a valley fold melt portion on the bottom boundary line and on the side boundary line.
FIG. 27 is a perspective view showing a state in which the bottom connecting piece and the side connecting piece are bent and brought into contact with the corner forming die (70).
FIG. 28 is a perspective view of a valley fold melt portion forming means (50) for forming a valley fold melt portion on the first boundary line.
[Explanation of symbols]
1 box
2 Box cover
10 First box unfolded body
11 Bottom forming plate
12 First side wall forming plate
13 Bottom connection piece
14 Side connection piece
15 First upper edge forming piece
16 First folding piece
132 Bottom connection end
142 Side connection end
121 First boundary line
131 Bottom border
141 Side border
151 First upper border
161 First folding border
20 Second box unfolded body
22 Second side wall forming plate
25 Second upper edge forming piece
26 Second folding piece
251 Second upper border
261 Second folding border
30 Box-lid development body
31 Lid forming plate
32 First lid side plate
33 Second lid side plate
34 Lid side plate connecting piece
321 First lid border
331 Second lid border
40 Heating means
50 Taniori melting part forming means
51 Taniori heating section
60 Welding and melting part forming means
61 Welding heating section
70 Corner forming type

Claims (3)

発泡ポリプロピレン樹脂板を箱形成素材とする箱体展開形成体を組立て形成し上部に開口部を備えた箱体（１）と前記開口部を閉塞する箱蓋体（２）とを有し、谷折側の面の境界線上を加熱により溶着溶融部分とし、前記谷折側の面の境界線で折り曲げて谷折溶融部分を硬化した構成を有する物品搬送用箱において、
側壁を構成する側壁形成板の上縁部分に上縁形成片を延設し、前記上縁形成片に対して折畳片を延設し、
箱体（１）の側壁の外部面側に、上縁形成片及び折畳片を折曲した構成とし、
側壁形成板と折畳片とが側壁の上方部分で対峙する面相互を溶着した構成で、
側壁形成板と上縁形成板との境界線上、及び、上縁形成片と折畳片との境界線上で、前記谷折溶融部分が硬化した構成として、
側壁の上縁部分の強度と、箱体（１）の寸法精度を確保したことを特徴とする物品搬送用箱。 And a Hakofutatai (2) for closing the opening of the box body expansion forming body to the box forming material a foamed polypropylene resin sheet was assembled form the box (1) having an opening in the upper valley In the article transport box having a configuration in which the melted part is heated and welded on the boundary line of the folding side surface, and the valley folding part is cured by bending at the boundary line of the valley folding side surface,
An upper edge forming piece is extended to the upper edge portion of the side wall forming plate constituting the side wall, and a folding piece is extended to the upper edge forming piece,
On the outer surface side of the side wall of the box (1), the upper edge forming piece and the folding piece are bent,
In the configuration where the side wall forming plate and the folded piece are welded to each other facing each other in the upper part of the side wall,
On the boundary line between the side wall forming plate and the upper edge forming plate, and on the boundary line between the upper edge forming piece and the folding piece,
An article carrying box characterized by securing the strength of the upper edge portion of the side wall and the dimensional accuracy of the box (1). 箱体展開形成体は、第一箱体展開形成体（１０）と、二枚の第二箱体展開形成体（２０）から構成し、A box body development formed body comprises a first box body development formed body (10) and two second box body development formed bodies (20),
第一箱体展開形成体（１０）について、側壁形成板を第一側壁形成板（１２）、上縁形成片を第一上縁形成片（１５）、折畳片を第一折畳片（１６）とし、For the first box body forming body (10), the side wall forming plate is the first side wall forming plate (12), the upper edge forming piece is the first upper edge forming piece (15), and the folding piece is the first folding piece ( 16)
前記第一箱体展開形成体（１０）は、底形成板（１１）と、その一対の対向する縁部に前記第一側壁形成板（１２）と、底形成板（１１）の他の対向する縁部に底部連結片（１３）を延設した構成とし、The first box body forming body (10) includes a bottom forming plate (11), and a pair of opposing edges of the first side wall forming plate (12) and the other facing of the bottom forming plate (11). The bottom connecting piece (13) is extended to the edge to be
第二箱体展開形成体（２０）は、側壁形成板として第二側壁形成板（２２）を備え、The second box body forming body (20) includes a second side wall forming plate (22) as a side wall forming plate,
二枚の第二箱体展開形成体（２０）の第二側壁形成板（２２）相互は対向し、且つ、各第二側壁形成板（２２）は第一側壁形成板（１２）に隣接した構成とし、The second side wall forming plates (22) of the two second box body forming bodies (20) face each other, and each second side wall forming plate (22) is adjacent to the first side wall forming plate (12). With configuration,
前記底形成板（１１）と第一側壁形成板（１２）との第一境界線（１２１）上、及び底形成板（１１）と底部連結片（１３）との底部境界線（１３１）上を加熱して谷折溶融部分を形成し、第一側壁形成板（１２）と底部連結片（１３）とを第一境界線（１２１）と底部境界線（１３１）とで直角に折り曲げ、硬化させた箱体（１）を有することを特徴とする請求項１記載の物品搬送用箱。On the first boundary line (121) between the bottom forming plate (11) and the first side wall forming plate (12) and on the bottom boundary line (131) between the bottom forming plate (11) and the bottom connecting piece (13). Is heated to form a valley fold melted portion, and the first side wall forming plate (12) and the bottom connecting piece (13) are bent at a right angle between the first boundary line (121) and the bottom boundary line (131), and cured. 2. An article carrying box according to claim 1, comprising a box (1). 第一側壁形成板（１２）の側縁部に、側部境界線（１４１）を介して側部連結片（１４）を延設し、前記側部境界線（１４１）は底部境界線（１３１）の延長線上とし、A side connecting piece (14) is extended to a side edge of the first side wall forming plate (12) via a side boundary line (141), and the side boundary line (141) is a bottom boundary line (131). ) On the extension line,
底部連結片（１３）の底部連結片端部（１３２）と、側部連結片（１４）の側部連結片端部（１４２）とで略Ｖ字形となる切れ込みを形成し、略Ｖ字形の切れ込みの先端は第一境界線（１２１）の端に一致させ、The bottom connecting piece end (132) of the bottom connecting piece (13) and the side connecting piece end (142) of the side connecting piece (14) form a substantially V-shaped cut, and the substantially V-shaped cut. The tip is aligned with the end of the first boundary line (121),
第二箱体展開形成体（２０）について、上縁形成片を第二上縁形成片（２５）、折畳片を第二折畳片（２６）とし、Regarding the second box body formation body (20), the upper edge forming piece is the second upper edge forming piece (25), the folding piece is the second folding piece (26),
前記第二側壁形成板（２２）の底縁部と側縁部とをそれぞれ前記第一箱体展開形成体（１０）の底部連結片（１３）と側部連結片（１４）とに対峙させるとともに、対峙する面相互を加熱、加圧手段により溶着して組立て形成される箱体（１）を有することを特徴とする請求項２記載の物品搬送用箱。The bottom edge portion and the side edge portion of the second side wall forming plate (22) are opposed to the bottom connection piece (13) and the side connection piece (14) of the first box body development forming body (10), respectively. 3. An article carrying box according to claim 2, further comprising a box (1) formed by welding the opposing surfaces to each other by heating and pressing means.
JP2002326691A 2002-11-11 2002-11-11 Goods transport box Expired - Lifetime JP4186103B2 (en)

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WO2015096227A1 (en) * 2013-12-23 2015-07-02 友达光电股份有限公司 Carton structure
WO2015170395A1 (en) * 2014-05-09 2015-11-12 日本たばこ産業株式会社 Paper product edge structure and paper package
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