JP3697979B2

JP3697979B2 - Self-supporting packaging bag

Info

Publication number: JP3697979B2
Application number: JP34130999A
Authority: JP
Inventors: 宜暉梅田; 一男斎木
Original assignee: 株式会社フジキカイ
Priority date: 1999-11-30
Filing date: 1999-11-30
Publication date: 2005-09-21
Anticipated expiration: 2019-11-30
Also published as: JP2001158441A

Description

【０００１】
【発明の属する技術分野】
本発明は、自立性包装袋、特に袋底面を広げた状態で自立させることのできる自立性包装袋に関するものである。
【０００２】
【従来の技術】
食品その他の物品が充填されるプラスチックフィルムからなる自立性包装袋では、その袋底面を広げた状態で自立させるように形成される。この包装袋に充填される物品が、例えば揚げ菓子やクッキー等の軽量物である場合、袋内に充填された物品の荷重により袋底面が確実に広がった状態とならず、自立安定性に欠けたり、あるいは袋底面の広がり状態のバラツキによって包装後の袋形状に差が発生し、販売される際の店頭における陳列状態での見栄えに悪影響を及ぼす等の問題がある。このような場合の１つの解決策として、従来では、例えば特開平１１−１１５９４８号公報で提案されているように、包装袋の底部側に紙製ホルダー等の硬性の保形材を別途挿入することによって、袋底面の拡開状態を保持していた。
【０００３】
【発明が解決しようとする課題】
前述した構成の自立性包装袋によれば、袋製袋後において、包装袋の上部開口から保形材を挿入する工程が別途必要になる。また、該包装袋は袋素材(プラスチックフィルム)と異なる材質(紙製)の保形材を有しているため、物品の使用後に消費者が包装袋を廃棄するに際しては、異なる材質の材料を分別する煩雑な作業が必要となる問題も指摘される。
【０００４】
【発明の目的】
この発明は、前述した従来の技術に内在している前記課題に鑑み、これを好適に解決するべく提案されたものであって、袋素材と異なる材質の保形材等を用いることなく、袋底面を広げた状態に保持することが可能な自立性包装袋を提供することを目的とする。
【０００５】
【課題を解決するための手段】
前述した課題を解決し、所期の目的を好適に達成するため、本発明に係る自立性包装袋は、
一枚のフィルムシートから角筒状に形成された袋の四角形状を呈する袋底面の全周縁に亘ってリブ用横シール部が形成されると共に、該袋底面における各角部に対応する袋胴部に袋高さ方向に延在するリブ用縦シール部が夫々形成され、袋上部に、対向する側面にガセット折込み部が夫々形成されると共に上部横シール部が形成された自立性包装袋であって、
前記袋底面に、前記リブ用横シール部の上縁に位置し、一方の対角に亘って直線的に延在して袋底面を広がった状態に保持可能な梁部としての折線が形成されると共に、
該梁部を頂部として袋内方側に向けて傾斜する略三角形状の傾斜部と、該傾斜部における一つの辺部を構成する前記梁部とは別の各辺部に連設されて角筒状の袋胴部における一側面の内側に沿って重合するよう折込み形成された第１折込重合部および前記一側面と交わる他方の側面の内側に沿って重合するよう折込み形成された第２折込重合部からなる折込部が、梁部を挟む両側に形成され、
前記各折込部の袋内方側の折込頂部は、梁部が延在する対角とは異なる対角の夫々に一致するよう設定され、
前記各折込重合部は、対応する側面との重合稜線部またはその全面が側面内側に溶着されていることを特徴とする。
【０００６】
【作用】
袋底面に形成された梁部と、該梁部を頂部として袋内方側に向けて傾斜する傾斜部および袋内側面に沿って重合するよう折込み形成された折込重合部からなる折込部とにより、該袋底面を広がった状態に保持することができ、充填される物品の性状等によって自立安定性が低下したり袋形状に差が発生することなく、安定した自立性を確保し得る。袋素材とは別材質の保形材を用いることなく袋底面を広がった状態に保持でき、分別廃棄の手間がなくなる。また折込部の折込重合部が、袋内側面との重合稜線部またはその全面において該袋内側面に溶着されることで、袋の保形性および自立性が向上する。更に、袋底面における複数の角部に対応する袋胴部に形成された袋高さ方向に延在する縦シール部または袋底面の全周縁に亘って形成された横シール部により、袋の保形性が確保される。
【０００７】
【発明の実施の形態】
次に、本発明に係る自立性包装袋につき、好適な実施例を挙げて、添付図面を参照しながら以下説明する。
【０００８】
図１は、実施例に係る自立性包装袋を斜視状態で示すものであり、図２は、自立性包装袋の上部を開口した状態で底面側からの斜視状態で示すものである。実施例の自立性包装袋１０は、一枚の片面溶着性のフィルムシートから構成されたものであって、その袋胴部１２は、底部が四角形となる角筒状に形成される。この袋胴部１２には、自立性包装袋１０の四角形状を呈する袋底面１６の四方の角部に対応する位置に、底部から上部に亘る袋高さ方向に延在するリブ用縦シール部(縦シール部)１４が夫々形成されている。また袋底面１６の全周縁に、リブ用横シール部(横シール部)１８が形成されており、該リブ用横シール部１８および前記リブ用縦シール部１４により、自立性包装袋１０の保形性が確保されるようになっている。なお、袋胴部１２は、図１において前後に対向する一対の幅広側面１２ａ,１２ａと、左右に対向する幅狭側面１２ｂ,１２ｂとから構成され、各幅広側面１２ａと幅狭側面１２ｂとの間にリブ用縦シール部１４が位置している。また各リブ用縦シール部１４は、対応する左右の幅狭側面１２ｂ,１２ｂに対しては直角に折曲された外方を指向するよう設定される。
【０００９】
前記自立性包装袋１０の袋底面１６を構成するフィルム(袋素材)には、図２に示す如く、袋底面１６を広がった状態に保持可能な方向である一方の対角に亘って直線的に延在するよう梁部としての折線２０が形成されている。また折線２０を挟む両側に、該折線２０を頂部としてフィルムが袋内方側に向けて傾斜するよう折込まれた略三角形状の傾斜部２１および該傾斜部２１の折線２０とは別の各辺部に連設されて袋内側面に沿って重合するよう折込み形成された第１および第２折込重合部５２,５４からなる折込部２２が夫々形成してある。各折込部２２の袋内方側の折込頂部２４は、折線２０が延在する対角とは異なる対角の夫々に一致するよう設定される。そして、袋底面１６において対角線上に延在する折線２０が、袋底面１６を四角形状に広げた状態を維持する梁として作用すると共に、該折線２０を挟む両側に位置する折込部２２,２２も袋底面１６を広がった状態に保持するべく機能する。なお実施例の折線２０は、前記リブ用横シール部１８の下端(袋外方端)より袋内方側に位置し、自立性包装袋１０を自立させた際の安定性を阻害しないよう構成してある。
【００１０】
図３は、前記自立性包装袋１０を展開した状態で示すものであって、該包装袋１０を構成する一枚の矩形状のフィルムシートでは、前記袋底面１６を構成する底面フィルムを挟むフィルムシートの長手方向両側に、前記袋胴部１２を構成する幅広側面１２ａと幅狭側面１２ｂとがフィルムシートの短手方向に平行に並ぶ側面フィルムが、フィルムシートの短手方向に延在する対応する底面第１山折り線２６を境界として夫々連設されている。なお、一方の側面フィルムにおける幅広側面１２ａと幅狭側面１２ｂとの位置と、他方の側面フィルムにおける幅広側面１２ａと幅狭側面１２ｂとの位置は逆になっている。また底面フィルムにおけるフィルムシートの長手方向両側には、各底面第１山折り線２６と平行な所定幅で底面第１シール代２８が夫々設定され、底面フィルムと各側面フィルムとが底面第１山折り線２６で山折りされた状態で、底面第１シール代２８,２８と両側面フィルムとの重合部が溶着されて前記リブ用横シール部１８が形成されている。
【００１１】
前記各側面フィルムにおいて、幅広側面１２ａと幅狭側面１２ｂとは、フィルムシートの短手方向に所定間隔離間してフィルムシートの長手方向に平行に延在する側面山折り線３０と側面第１谷折り線３２とを挟んで位置し、側面フィルムが側面山折り線３０で山折りされると共に側面第１谷折り線３２で谷折りされた状態で、両折り線３０,３２の間に臨む側面第１シール代３４と幅広側面１２ａとの重合部が溶着されて前記リブ用縦シール部１４が形成される。また各側面フィルムにおいて、幅狭側面側におけるフィルムシートの短手方向の開放端から内側に所定間隔離間して側面第２谷折り線３６が平行に形成されると共に、幅広側面側におけるフィルムシートの短手方向の開放端から内側に所定幅で側面第２シール代３８が設定される。そして、一方の側面フィルムにおける側面第２シール代３８と、他方の側面フィルムの側面第２谷折り線３６で谷折りされた側面第３シール代４０との重合部が溶着されて、前記リブ用縦シール部１４が形成されている。
【００１２】
前記底面フィルムでは、両側面フィルムにおける側面山折り線３０と底面第１山折り線２６とが交差する位置から底面第１シール代２８の長さ分だけ直線的に底面第２谷折り線４１が形成される。そして、両底面第２谷折り線４１,４１の間に亘り、前記折線２０が斜めに延在している。また底面フィルムにおけるフィルムシートの短手方向両端部には、前記各側面フィルムにおける側面第２谷折り線３６から底面フィルムにおけるフィルムシートの長手方向の中央部まで底面第２山折り線４４が直線的に延在し、該折り線４４により底面第２シール代４６が形成される。更に、底面フィルムにおけるフィルムシートの長手方向の中央部を挟んで底面第２シール代４６の反対側には、同一幅で前記各側面第２シール代３８まで延在する底面第３シール代４８が形成される。更にまた、底面フィルムにおけるフィルムシートの長手方向の中央と前記各底面第２山折り線４４との交点に、前記折込部２２の折込頂部２４が夫々臨み、各折込頂部２４を基点として折線２０の両端に向かう２本の底面第１谷折り線４２が夫々形成されている。そして底面フィルムが、前記折線２０で山折りされると共に４本の底面第１谷折り線４２で谷折りされることで、折線２０を頂部として袋内方側に傾斜する折込部２２,２２が形成される。なお底面フィルムには、前記各側面フィルムにおける側面第１谷折り線３２から対応する底面第１谷折り線４２と交差する位置まで直線的に延びる底面第３山折り線４５が形成される。
【００１３】
前記底面フィルムにおける前記底面第２シール代４６と底面第３シール代４８との間には、前記底面第１山折り線２６と平行な底面第３谷折り線４３が形成され、該底面第３谷折り線４３で底面フィルムが谷折りされることで、底面第２シール代４６と底面第３シール代４８とがフィルム非溶着面側(外面側)で重合される。すなわち、前記各底面第１谷折り線４２で底面フィルムが谷折りされると共に、前記各底面第１山折り線２６で側面フィルムを山折りした状態で、前記側面第２シール代３８と側面第３シール代４０との間に、非溶着面同士を重合した底面第２シール代４６と底面第３シール代４８とが挟持された状態で重合される。なお、底面第２シール代４６および底面第３シール代４８には、側面第２および第３シール代３８,４０のフィルム溶着面(内面)を露出するための複数の切欠部５０が形成され、袋下部における側面第２シール代３８と側面第３シール代４０とは、底面第２および第３シール代４６,４８の各切欠部５０,５０を介して溶着されている。
【００１４】
前記底面フィルムの折線２０を挟む両側において、底面第１シール代２８、底面第１谷折り線４２および底面第２山折り線４４により、折込部２２を構成する略三角形状の第１折込重合部(折込重合部)５２が画成され、該第１折込重合部５２は、前記側面フィルムの幅狭側面１２ｂ(袋内側面)に沿って袋下端側から袋内方側に向けて重合するよう折込まれている。また底面第１シール代２８、底面第１谷折り線４２および底面第３シール代４８により、折込部２２を構成する略三角形状の第２折込重合部(折込重合部)５４が画成され、該第２折込重合部５４は、側面フィルムの幅広側面１２ａ(袋内側面)に沿って袋下端側から袋内方側に向けて重合するよう折込まれている。なお実施例では、第１折込重合部５２および第２折込重合部５４は、何れも対応する側面１２ａ,１２ｂ(袋内側面)との重合稜線部である各底面第１谷折り線４２において溶着されているが、両重合部５２,５４の全面を溶着するようにしてもよい。また両重合部５２,５４を全面溶着する場合は、前記リブ用横シール部１８も一体的に施されることとなるから、該横シール部１８のみを別途施す工程は不要である。
【００１５】
前記自立性包装袋１０の袋上部には、袋胴部１２における対向する幅狭側面１２ｂ,１２ｂに、各幅狭側面１２ｂを幅方向の中央で袋内方側に折込んだガセット折込み部５６が夫々形成されると共に、一対の幅広側面１２ａ,１２ａを合掌状に重ね合わせて熱溶着した上部横シール部５８が形成されている。
【００１６】
すなわち実施例の自立性包装袋１０では、袋底面１６に形成された折線２０および一対の折込部２２,２２により、該袋底面１６は四角形状に広がった状態に保持され、安定した自立性を確保し得る。
【００１７】
【変更例】
図４および図５は、前述した実施例の変更例を示すものであって、その基本的な構成は前述した実施例と同一であるので、異なる部分についてのみ説明する。すなわち、図４に示す変更例は、前記袋胴部１２の各幅狭側面１２ｂの幅方向中央に、その底部から上部に亘って縦シール部６０が形成される。また図５に示す変更例では、前記袋胴部１２の一方の幅広側面１２ａの幅方向中央に、その底部から上部に亘って縦シール部６２が形成されている。
【００２４】
なおフィルムシートは、片面溶着性のフィルムではなく、両面溶着性のフィルムを用いてもよく、また折込重合部と側面のフィルムが４重状態で溶着される部分のみ両面溶着加工されたものを採用可能である。
【００２５】
【発明の効果】
以上説明した如く、本発明に係る自立性包装袋によれば、袋底面に、底面形状を保持可能な方向に延在する梁部を形成したので、袋底面を常に広がった状態に保持することができる。従って、製袋後の袋に物品を充填する際には、袋底面が所定形状に広がった状態に保持されているので、物品充填を良好に行なうことができる。また物品の充填状態や性状等の違いによって袋における底面の広がり形状に差を生ずることはないので、店頭での陳列時の見栄えを良好にし得る。更に、袋素材自体に、袋底面を広がった状態に保持する梁部および折込部を形成するので、異なる材質の保形材等を用いる必要はなく、分別廃棄の手間を省くことができる。更にまた、袋の製袋過程においてフィルムを折込むことで梁部や折込部を形成することができるから、保形材等を挿入する工程を必要としない。なお、折込部は、袋胴部を構成して交差する２つの側面の内側に沿って重合する第１および第２折込重合部を備えているので、袋底面における保形性を高め、自立性をより良好なものとし得る。
【００２６】
前記折込部の各折込重合部を対応する側面の内側に沿って溶着したので、より一層の保形性、自立性を向上することができる。
【図面の簡単な説明】
【図１】本発明の好適な実施例に係る自立性包装袋を示す概略斜視図である。
【図２】実施例に係る自立性包装袋を上部を開口した状態で底面側から視た概略斜視図である。
【図３】実施例に係る自立性包装袋を展開して袋内面側を示す展開図である。
【図４】実施例に係る自立性包装袋の変更例を示す概略斜視図である。
【図５】実施例に係る自立性包装袋の別の変更例を示す概略斜視図である。
【符号の説明】
１２袋胴部
１２ａ幅広側面 ( 他方の側面 )
１２ｂ幅狭側面 ( 一方の側面 )
１４リブ用縦シール部(縦シール部)
１６袋底面
１８リブ用横シール部(横シール部)
２０折線(梁部)
２１傾斜部
２２折込部
２４折込頂部
４２第１谷折り線 ( 別の辺部 )
５２第１折込重合部
５４第２折込重合部
５６ガセット折込み部
５８上部横シール部 [0001]
BACKGROUND OF THE INVENTION
The present invention relates to a self-supporting packaging bag, and more particularly to a self-supporting packaging bag that can be made self-supporting in a state where the bottom of the bag is widened.
[0002]
[Prior art]
A self-supporting packaging bag made of a plastic film filled with food or other articles is formed so as to be self-supporting in a state where the bottom surface of the bag is widened. When the article filled in the packaging bag is a light article such as fried confectionery or a cookie, the bottom of the bag does not surely spread due to the load of the article filled in the bag, and lacks in self-supporting stability. There is a problem that the bag shape after packaging is different due to variations in the spread state of the bottom surface of the bag, which adversely affects the appearance of the display in the store when sold. As one solution in such a case, conventionally, for example, as proposed in Japanese Patent Application Laid-Open No. 11-115948, a hard shape-holding material such as a paper holder is separately inserted into the bottom side of the packaging bag. As a result, the expanded state of the bottom surface of the bag was maintained.
[0003]
[Problems to be solved by the invention]
According to the self-supporting packaging bag having the above-described configuration, a process of inserting a shape-retaining material from the upper opening of the packaging bag is necessary after bag making. In addition, since the packaging bag has a shape retaining material made of a material (made of paper) different from the bag material (plastic film), when the consumer discards the packaging bag after using the article, a material of a different material is used. Problems that require cumbersome sorting work are also pointed out.
[0004]
OBJECT OF THE INVENTION
In view of the above-mentioned problems inherent in the prior art described above, the present invention has been proposed to suitably solve this problem, and without using a shape-retaining material or the like that is different from the bag material. It aims at providing the self-supporting packaging bag which can be hold | maintained in the state which extended the bottom face.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problems and achieve the intended purpose suitably, the self-supporting packaging bag according to the present invention is:
A lateral seal portion for ribs is formed over the entire periphery of the bottom surface of the bag that forms a rectangular shape of a bag formed in a rectangular tube shape from a single film sheet, and the bag body corresponding to each corner portion on the bottom surface of the bag A self-supporting packaging bag in which a vertical seal portion for ribs extending in the bag height direction is formed in each portion, a gusset folding portion is formed on each side of the bag, and an upper lateral seal portion is formed There,
The bag bottom, situated on the edge of the rib transverse seal portion, the fold line as a retainable beam portion in a state in which spread the bag bottom surface linearly extends over the one diagonal formed As
A substantially triangular inclined portion that inclines toward the inner side of the bag with the beam portion as a top portion , and a corner that is connected to each side portion different from the beam portion constituting one side portion in the inclined portion . A first fold overlapping portion formed so as to be polymerized along the inner side of one side surface in the cylindrical bag body portion, and a second fold formed so as to be polymerized along the inner side of the other side surface intersecting with the one side surface. Folded parts consisting of overlapping parts are formed on both sides sandwiching the beam part ,
The folding top on the bag inner side of each folding part is set to match each of the diagonals different from the diagonal from which the beam part extends,
Each of the folded overlapping portions is characterized in that the overlapping ridge portion with the corresponding side surface or the entire surface thereof is welded to the inside of the side surface .
[0006]
[Action]
A beam part formed on the bottom surface of the bag, and a folding part composed of an inclined part inclined toward the inner side of the bag with the beam part as a top part and a folded overlapping part formed to be polymerized along the inner side surface of the bag The bag bottom surface can be held in an expanded state, and stable independence can be ensured without lowering the independence stability or causing a difference in the bag shape depending on the properties of the articles to be filled. The bottom of the bag can be held in an expanded state without using a shape retaining material that is different from the bag material, eliminating the need for sorting and disposal. In addition, the folded overlapping portion of the folded portion is welded to the inner surface of the bag on the entire surface of the overlapping ridge line with the inner surface of the bag or on the entire surface thereof, thereby improving the shape retention and self-supporting properties of the bag. Further, the bag is held by a vertical seal portion formed in the bag body portion corresponding to a plurality of corners on the bag bottom surface and extending in the bag height direction or a horizontal seal portion formed over the entire periphery of the bag bottom surface. Formability is ensured.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, the self-supporting packaging bag according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment.
[0008]
FIG. 1 shows a self-supporting packaging bag according to the embodiment in a perspective state, and FIG. 2 shows a perspective view from the bottom side with the top of the self-supporting packaging bag opened. The self-supporting packaging bag 10 of the embodiment is composed of a single-side weldable film sheet, and the bag body 12 is formed in a rectangular tube shape with a bottom portion being a quadrangle. The bag body 12 has a rib vertical seal portion extending in the bag height direction from the bottom to the top at a position corresponding to the four corners of the bag bottom 16 that has the rectangular shape of the self-supporting packaging bag 10. (Vertical seal portions) 14 are respectively formed. Further, a rib horizontal seal portion (lateral seal portion) 18 is formed on the entire periphery of the bag bottom surface 16, and the self-supporting packaging bag 10 is held by the rib horizontal seal portion 18 and the rib vertical seal portion 14. Formability is secured. In addition, the bag trunk | drum 12 is comprised from a pair of wide side surface 12a, 12a which opposes back and forth in FIG. 1, and the narrow side surface 12b, 12b which opposes right and left, Each wide side surface 12a and narrow side surface 12b The rib vertical seal portion 14 is located therebetween. Each rib vertical seal portion 14 is set so as to be directed outward at a right angle with respect to the corresponding left and right narrow side surfaces 12b, 12b.
[0009]
As shown in FIG. 2, the film (bag material) constituting the bag bottom surface 16 of the self-supporting packaging bag 10 is linear across one diagonal which is a direction in which the bag bottom surface 16 can be held in an expanded state. A fold line 20 as a beam portion is formed so as to extend in the vertical direction. Further, on both sides of the fold line 20, a substantially triangular inclined portion 21 in which the film is inclined toward the inner side of the bag with the fold line 20 as a top, and each side different from the fold line 20 of the inclined portion 21 Folded portions 22 each formed of first and second folded overlapping portions 52 and 54 are formed so as to be continuous with each other and overlapped along the inner side surface of the bag. The folding top portion 24 on the bag inner side of each folding portion 22 is set so as to coincide with each of the diagonals different from the diagonal from which the folding line 20 extends. The folding line 20 extending diagonally on the bag bottom surface 16 acts as a beam that maintains the state in which the bag bottom surface 16 is expanded in a square shape, and the folding portions 22, 22 located on both sides sandwiching the folding line 20 are also included. It functions to hold the bag bottom 16 in an expanded state. The folding line 20 of the embodiment is located on the inner side of the bag from the lower end (outer side of the bag) of the rib side seal portion 18 so as not to impair the stability when the self-supporting packaging bag 10 is made to stand. Citea Ru.
[0010]
FIG. 3 shows the self-supporting packaging bag 10 in a developed state. In one rectangular film sheet constituting the packaging bag 10, a film sandwiching the bottom film constituting the bag bottom surface 16. A side film in which the wide side surface 12a and the narrow side surface 12b constituting the bag body 12 are arranged in parallel to the short direction of the film sheet on both sides in the longitudinal direction of the sheet extends in the short direction of the film sheet. The bottom first mountain fold line 26 is connected to each other as a boundary. In addition, the position of the wide side surface 12a and the narrow side surface 12b in one side film and the position of the wide side surface 12a and the narrow side surface 12b in the other side film are reversed. In addition, on the both sides in the longitudinal direction of the film sheet in the bottom film, a bottom first seal margin 28 is set with a predetermined width parallel to each bottom first crest fold line 26, and the bottom film and each side film are connected to the bottom first crest. In the state of being folded at the folding line 26, the overlapping portions of the bottom first seal margins 28, 28 and the both side films are welded to form the rib lateral seal portion 18.
[0011]
In each of the side films, the wide side surface 12a and the narrow side surface 12b are separated from each other by a predetermined distance in the short direction of the film sheet and a side fold line 30 extending in parallel with the longitudinal direction of the film sheet and the first side valley A side surface that is positioned between the fold lines 32 and faces between the fold lines 30 and 32 in a state in which the side film is fold-folded at the side fold lines 30 and at the first side valley fold lines 32. The overlapping portion of the first seal margin 34 and the wide side surface 12a is welded to form the rib vertical seal portion 14. Further, in each side film, side second valley fold lines 36 are formed in parallel with a predetermined distance from the open end in the short direction of the film sheet on the narrow side surface side, and the film sheet on the wide side side is formed. A side second seal margin 38 is set with a predetermined width inward from the open end in the short direction. Then, the overlapping portion of the side surface second seal margin 38 in one side film and the side surface third seal margin 40 folded at the side surface second valley fold line 36 of the other side film is welded, and the rib A vertical seal portion 14 is formed.
[0012]
In the bottom film, the bottom second valley fold line 41 is linearly formed by the length of the bottom first seal margin 28 from the position where the side surface fold line 30 and the bottom first mountain fold line 26 of the both side films intersect. It is formed. The fold line 20 extends obliquely between the bottom bottom second fold lines 41 and 41. Further, at both ends in the short direction of the film sheet in the bottom film, the bottom second fold line 44 is linear from the side face second valley fold line 36 in each side film to the center part in the longitudinal direction of the film sheet in the bottom film. The bottom surface second seal margin 46 is formed by the fold line 44. Further, on the opposite side of the bottom surface second seal margin 46 across the center of the film sheet in the longitudinal direction of the bottom film, a bottom surface third seal margin 48 extending to the side surface second seal margin 38 with the same width is provided. It is formed. Furthermore, the folding top portions 24 of the folding portions 22 respectively face the intersections between the center of the film sheet in the longitudinal direction of the bottom film and the respective second bottom fold lines 44, and the folding lines 20 of the folding lines 20 with the respective folding top portions 24 as base points. Two bottom first valley fold lines 42 are formed respectively toward both ends. Then, the bottom film is folded at the fold line 20 and at the four bottom first valley fold lines 42, so that the folded portions 22, 22 that incline toward the inner side of the bag with the fold line 20 as a top portion. It is formed. The bottom film is formed with a bottom third mountain fold line 45 that linearly extends from the side surface first valley fold line 32 in each side film to a position intersecting with the corresponding bottom surface first valley fold line 42.
[0013]
A bottom surface third valley fold line 43 parallel to the bottom surface first mountain fold line 26 is formed between the bottom surface second seal margin 46 and the bottom surface third seal margin 48 in the bottom film, and the bottom surface third When the bottom film is valley-folded at the valley fold line 43, the bottom second seal margin 46 and the bottom third seal margin 48 are polymerized on the film non-welded surface side (outer surface side). That is, the bottom film is valley-folded at each bottom first valley fold line 42, and the side film is folded at each bottom first mountain fold line 26. Polymerization is performed in a state where a bottom second seal margin 46 and a bottom third seal margin 48 in which the non-welded surfaces are overlapped are sandwiched between the three seal margins 40. The bottom surface second seal margin 46 and the bottom surface third seal margin 48 are formed with a plurality of notches 50 for exposing the film welding surfaces (inner surfaces) of the side surface second and third seal margins 38, 40, The side surface second seal margin 38 and the side surface third seal margin 40 at the lower portion of the bag are welded through the notch portions 50 and 50 of the bottom surface second and third seal margins 46 and 48.
[0014]
On both sides of the fold line 20 of the bottom film, the first fold overlapping portion having a substantially triangular shape constituting the fold portion 22 by the bottom face first seal margin 28, the bottom face first valley fold line 42 and the bottom face second mountain fold line 44. (Folding polymerization portion) 52 is defined, and the first folding polymerization portion 52 is polymerized from the bag lower end side toward the bag inner side along the narrow side surface 12b (bag inner surface) of the side film. It is inserted. The bottom first seal margin 28, the bottom first valley fold line 42 and the bottom third seal margin 48 define a substantially triangular second folding overlapping portion (folding overlapping portion) 54 constituting the folding portion 22. The second folding overlapping portion 54 is folded so as to be polymerized from the bag lower end side toward the bag inner side along the wide side surface 12a (bag inner side surface) of the side film. In addition, in an Example, the 1st folding superposition | polymerization part 52 and the 2nd folding superposition part 54 are welded in each bottom face 1st valley fold line 42 which is a superposition | polymerization ridgeline part with the corresponding side surfaces 12a and 12b (bag inner side surface). However , you may make it weld the whole surface of both the superposition | polymerization parts 52 and 54. FIG. Further, when both the overlapping portions 52 and 54 are welded over the entire surface, the rib horizontal seal portion 18 is also integrally formed, and therefore a step of separately applying only the horizontal seal portion 18 is not necessary.
[0015]
In the upper part of the self-supporting packaging bag 10, a gusset folding portion 56 is formed by folding each narrow side surface 12 b into the inner side of the bag at the center in the width direction on the opposing narrow side surfaces 12 b, 12 b in the bag body 12. Are formed, and a pair of wide side surfaces 12a, 12a are overlapped in the shape of a palm, and an upper lateral seal portion 58 is formed by heat welding.
[0016]
That is, in the self-supporting packaging bag 10 of the embodiment, the bag bottom surface 16 is held in a square shape by the folding line 20 formed on the bag bottom surface 16 and the pair of folding portions 22 and 22, thereby providing stable self-supporting properties. It can be secured.
[0017]
[Example of change]
4 and 5 show a modification of the above-described embodiment, and the basic configuration is the same as that of the above-described embodiment. Therefore, only different portions will be described. That is, in the modification shown in FIG. 4, the vertical seal portion 60 is formed from the bottom to the top at the center in the width direction of each narrow side surface 12 b of the bag body 12. Further, in the modified example shown in FIG. 5, a vertical seal portion 62 is formed from the bottom to the top in the center in the width direction of one wide side surface 12 a of the bag body 12.
[0024]
Contact film sheets such, rather than one side welding of the film, may be used a double-sided welding of the film, also those film folded overlapping portion and the side surface is double-sided fusion bonded only portions to be welded quadruple state It can be adopted.
[0025]
【The invention's effect】
As described above, according to the self-supporting packaging bag according to the present onset bright, the bag bottom, so to form a beam portion extending in a direction capable of holding the bottom shape, holds the bag bottom is always expanded state be able to. Therefore, when the bag is filled with the article, the bottom of the bag is held in a predetermined shape, so that the article can be satisfactorily filled. In addition, since there is no difference in the shape of the bottom of the bag due to differences in the state of filling or properties of the articles, the appearance at the time of display at the store can be improved. Furthermore, since the beam part and the folding part which hold | maintain the state which expanded the bag bottom face are formed in bag material itself, it is not necessary to use a shape-retaining material etc. of a different material, and the effort of separation disposal can be saved. Furthermore, since a beam part and a folding part can be formed by folding a film in the bag making process, there is no need to insert a shape-retaining material or the like. In addition, since a folding part is equipped with the 1st and 2nd folding superposition | polymerization part superposed | polymerized along the inner side of the two side surfaces which comprise a bag trunk | drum and cross | intersect, shape retention property in a bag bottom face is improved, and self-supporting property Can be made better.
[0026]
Since welded along the inner side surface of the corresponding respective fold overlapping portions of the folded portion, Ru can be improved even more shape retention, autonomy.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing a self-supporting packaging bag according to a preferred embodiment of the present invention.
FIG. 2 is a schematic perspective view of the self-supporting packaging bag according to the embodiment as viewed from the bottom side with the upper part opened.
FIG. 3 is a development view showing the bag inner surface side by developing the self-supporting packaging bag according to the embodiment.
FIG. 4 is a schematic perspective view showing a modified example of the self-supporting packaging bag according to the embodiment.
FIG. 5 is a schematic perspective view showing another modified example of the self-supporting packaging bag according to the embodiment .
[Explanation of symbols]
12 Bag body
12a Wide side (the other side )
12b Narrow side ( one side )
14 Vertical seal for rib (vertical seal)
16 Bottom of bag 18 Lateral seal for rib (lateral seal)
20 Polyline (beam)
21 Inclined part 22 Folding part 24 Folding top part
42 First valley fold line ( another side )
52 first inserts overlapping portions 54 and the second fold overlapping portions 56 gusset flaps 58 upper transverse seal portion

Claims

A rib side seal portion (18) is formed over the entire periphery of the bottom surface (16) of the bag that has a rectangular shape of a bag formed in a rectangular tube shape from a single film sheet, and the bottom surface of the bag (16) In the bag body portion (12) corresponding to each corner portion, a rib vertical seal portion (14) extending in the bag height direction is formed, respectively, and a gusset folding portion (56) is formed on the opposite side surface on the bag upper portion. A self-supporting packaging bag formed with an upper lateral seal portion (58) , respectively,
The bag bottom surface ( 16) is located at the upper edge of the rib lateral seal portion (18) , and extends linearly across one diagonal to expand the bag bottom surface ( 16). with fold lines are formed as capable of holding beam unit (2 0),
The beams portion (2 0) substantially triangular inclined portion inclined toward the bag side in the top portion (2 1), the beam portion constituting one side portion of the inclined portion (2 1) ( A first fold formed so as to be overlapped along the inner side of one side surface (12b) of the rectangular tube-shaped bag body portion (12) connected to each side portion (42, 42) different from 20) folded portions formed of the second fold overlapping portions which are folded formed so as to polymerize along the inside of the overlapped portion (52) and said intersecting the one side surface (12b) the other side surface (12a) (54) (2 2) is, Formed on both sides sandwiching the beam (20) ,
The folding top portion (24) on the bag inner side of each folding portion (22) is set so as to coincide with each of the diagonals different from the diagonal from which the beam portion (20) extends,
The self-supporting packaging bag, wherein each of the folded overlapping portions (52, 54) is welded to the inner side surface of the overlapping ridge line portion or the entire surface with the corresponding side surface (12a, 12b) .