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JP5345804B2 - Synthetic resin cup-type container and method for producing the cup-type container - Google Patents
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JP5345804B2 - Synthetic resin cup-type container and method for producing the cup-type container - Google Patents

Synthetic resin cup-type container and method for producing the cup-type container Download PDF

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JP5345804B2
JP5345804B2 JP2008142655A JP2008142655A JP5345804B2 JP 5345804 B2 JP5345804 B2 JP 5345804B2 JP 2008142655 A JP2008142655 A JP 2008142655A JP 2008142655 A JP2008142655 A JP 2008142655A JP 5345804 B2 JP5345804 B2 JP 5345804B2
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cup
flange
blow molding
container
cup body
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JP2009286045A (en
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佳広 布施
昌弘 須貝
隆之 小林
正人 鈴木
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Yoshino Kogyosho Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flange bearing cup type container requiring no whitening treatment. <P>SOLUTION: In a synthetic resin made cup type container having a cup body 1 and a flange 2, the cup body 1 and the flange 2 are brought into a product shape by blow molding; provided that the cup body 1 is made by integrally joining an annular peripheral wall 1b which forms the barrel section of the container and a fringe of bottom wall 1a, thereby delimiting and forming a filling space of contents inside its sphere, and that the flange 2 is arranged to the upper orifice 1' of the cup body 1. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

本発明は、口部の周りにフランジを備えた合成樹脂製のカップ型容器及びその製造方法に関するものであり、該容器の耐熱性の改善を図ろうとするものである。   The present invention relates to a cup-shaped container made of a synthetic resin having a flange around the mouth and a method for producing the same, and intends to improve the heat resistance of the container.

底壁の縁部に環状周壁を起立させてその内側領域に内容物の充填空間を区画形成するカップ型の容器は、効率的な製造が可能であり、衛生面における管理が比較的容易であることから近年、コーヒーや乳飲料、アイスクリームの如き冷蔵、冷凍菓子、お茶等の容器として多用されるようになってきている。   A cup-type container in which an annular peripheral wall is erected at the edge of the bottom wall and a content filling space is defined in the inner region thereof can be efficiently manufactured and is relatively easy to manage in terms of hygiene. Therefore, in recent years, it has come to be frequently used as a container for coffee, milk drinks, refrigeration such as ice cream, frozen confectionery, tea and the like.

かかるカップ型の容器は容器の口部開口の周りに外側へ向けて延出するフランジが設けられており、このフランジに薄肉のシートを貼着することにより容器を密封状態に保持している。   Such a cup-shaped container is provided with a flange extending outwardly around the mouth opening of the container, and a thin sheet is adhered to the flange to hold the container in a sealed state.

ところで、この種の容器は、サーモフォーミングや射出成形によって製造されているのが普通であり、容器に充填すべき内容物としてその温度が90℃にも及ぶようなものを充填する場合には容器の胴体部分はフランジを含め熱による変形が避けられない状況にあった。   By the way, this type of container is usually manufactured by thermoforming or injection molding. When filling a container whose temperature is as high as 90 ° C. The fuselage part of this machine was in a situation where deformation due to heat including the flange was inevitable.

この点に関する先行技術としては、結晶性樹脂からなる一次成形品を用い、この一次成型品をブロー成形することによって耐熱性の改善を図った技術が知られている(例えば、特許文献1参照)が、フランジ部については熱による結晶化を施す、所謂、白化処理により耐熱性を付与していることから、効率的な製造を行うのが困難なばかりか、例えば、容器の全てを透明あるいは半透明で構成する必要がある場合には容易に対処し得ないのが現状であった。
特開2004−58602号公報
As a prior art regarding this point, a technique in which heat resistance is improved by using a primary molded product made of a crystalline resin and blow molding the primary molded product is known (see, for example, Patent Document 1). However, since heat resistance is imparted to the flange portion by so-called whitening treatment, which is heat crystallization, it is difficult to produce efficiently. The current situation is that it is not possible to easily deal with the case where it is necessary to make it transparent.
JP 2004-58602 A

本発明の課題は、効率的な製造が可能であり、かつ、容器の全体について耐熱性の改善を図ることができる新規な合成樹脂製のカップ型容器を提案するところにある。   An object of the present invention is to propose a novel synthetic resin cup-type container that can be efficiently manufactured and that can improve the heat resistance of the entire container.

本発明は、底壁の縁部に容器の胴部を形成する環状周壁を一体的に連結してその内側領域に内容物の充填空間を区画形成するカップ本体と、このカップ本体の上端開口部に配設されたフランジとを備えた合成樹脂製のカップ型容器であって、
前記カップ本体を、フランジとともにブロー成形によって成形してなり、
前記フランジは、ブロー成形の際にカップ本体とともに延伸を伴うものであり、
前記ブロー成形が、成形体の加熱処理を挟む前後二回のブロー成形によるものであり、
前記カップ型容器は、ポリエチレンテレフタレート樹脂の単一素材からなり、
前記胴部の密度は1.380〜1.400g/cm であり、前記フランジの密度は1.385g/cm 以上であることを特徴とする合成樹脂製のカップ型容器である。
The present invention relates to a cup body that integrally connects an annular peripheral wall that forms the body of the container to the edge of the bottom wall, and forms a filling space for contents in its inner region, and an upper end opening of the cup body A cup-shaped container made of a synthetic resin provided with a flange disposed in
The cup body is formed by blow molding together with a flange,
The flange is accompanied by stretching together with the cup body during blow molding,
The blow molding state, and are not due to the blow molding before and after twice interposing the heat treatment of the shaped body,
The cup-shaped container is made of a single material of polyethylene terephthalate resin,
A density of the trunk is 1.380 to 1.400 g / cm 3 , and a density of the flange is 1.385 g / cm 3 or more .

上記の構成になるカップ型容器においてフランジは、ブロー成形の際にカップ本体とともに延伸を伴うものであるので、これによれば白化処理によらずとも耐熱性を高めることが可能となる。 Flange In a cup-shaped container made to the above configuration, since those with a drawn along the cup body during the blow molding, it is possible to improve the heat resistance without relying on bleaching process according to this.

ブロー成形は、成形体の加熱処理を挟む前後二回のブロー成形を行うダブルブロー成形法がとくに有利に適合する。   For blow molding, a double blow molding method in which blow molding is performed twice before and after the heat treatment of the molded body is particularly advantageously adapted.

カップ型容器の構成素材としては、ポリエチレンテレフタレート樹脂を用いるものとし、胴部の密度は1.380〜1.400g/cmであり、前記フランジの密度は1.385g/cm以上とするThe constituent material of the cup-shaped container, and those using polyethylene terephthalate resin, the density of the body is 1.380~1.400g / cm 3, the density of the flange is set to 1.385 g / cm 3 or more.

カップ型容器を、カップ本体のみならずフランジを含めてその全体をブロー成形(ダブルブロー成形)によって形成すると、白化処理をせずとも耐熱性の改善が図られ、透明あるいは半透明のカップ型容器を容易に製造し得る。   When a cup-shaped container is formed entirely by blow molding (double blow molding) including not only the cup body but also the flange, heat resistance is improved without whitening treatment, and a transparent or translucent cup-shaped container Can be easily manufactured.

また、白化処理が不要なので製造工程の簡略化、製造ラインの短縮化が可能でカップ型容器の効率的な製造が可能となる。   Further, since the whitening treatment is unnecessary, the manufacturing process can be simplified and the manufacturing line can be shortened, and the cup-shaped container can be efficiently manufactured.

カップ型容器のような口径が大きい容器をブロー成形するに当たってはそれに対応するような口径の大きなプリフォームを射出成形によって成形する必要があり、この場合、プリフォームの個数取りが少なくなり生産性が劣化する不具合があるが、本発明のブロー成形に用いるプリフォームはボトル等のブロー成形に使用するプリフォームを用いることができるので個数取りが少なくなることがない。   When blow-molding a container with a large diameter such as a cup-type container, it is necessary to form a preform with a large diameter corresponding to that by injection molding. In this case, the number of preforms is reduced and productivity is reduced. Although there is a problem of deterioration, the preform used for blow molding according to the present invention can be used in a preform for blow molding of a bottle or the like, and therefore, the number of pieces is not reduced.

以下、図面を用いて本発明をより具体的に説明する。
図1は本発明にしたがう合成樹脂製のカップ型容器の実施の形態を示した図である。
Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is a view showing an embodiment of a cup-shaped container made of a synthetic resin according to the present invention.

図1における1はカップ型容器の主要部を構成するカップ本体である。このカップ本体1は容器の底部を形成する底壁1aと、この底壁1aの縁部に一体的につながり容器の胴部を形成する環状周壁1bからなる。   In FIG. 1, reference numeral 1 denotes a cup body constituting the main part of the cup-type container. The cup body 1 includes a bottom wall 1a that forms the bottom of the container, and an annular peripheral wall 1b that is integrally connected to the edge of the bottom wall 1a and forms the body of the container.

また、2はカップ本体1の上端開口部1′から外方に突出するように水平に配設されたフランジである。このフランジ2は内周端縁2aがカップ本体1の上端開口部1′に一体連結しており、外周端縁2bがカップ本体1のサイズよりも外側へ向けて突出した自由端になっている。なお、本発明のカップ型容器に形成されるフランジ2は傾斜をつけて突設してもよいし、図示したフランジ2とは逆向き、すなわち、内方に向けて突設することも可能である。   Reference numeral 2 denotes a flange disposed horizontally so as to protrude outward from the upper end opening 1 ′ of the cup body 1. The flange 2 has an inner peripheral edge 2 a integrally connected to the upper end opening 1 ′ of the cup body 1, and an outer peripheral edge 2 b is a free end protruding outward from the size of the cup body 1. . The flange 2 formed on the cup-shaped container of the present invention may be provided with an inclination, or may be provided in the opposite direction to the illustrated flange 2, that is, inward. is there.

ボトルのブロー成形に使用されるような通常のプリフォーム(試験管状をなすもの)を成形したのち、該プリフォームを用いた加熱収縮工程を含む二段階のブロー成形(ダブルブロー成形)により図2に示すような外観形状を呈するブロー成形体(最終成形体)を成形し、さらに図2中のC−C部位から下側部分をカップ型容器に仕上げればよく、このような成形方式にしたがうことによりカップ本体1のみならずフランジ2についても延伸加工が施されるため、耐熱性の改善を図りつつも容器の全体を透明な状態に保持することが可能となる。なお、図2に示したところの最終成形体につき、その下側部分をカップ型容器に仕上げるには、図2中のC−Cを境にして水平方向にカットしてもよいし、容器のフランジに対応する部位に下から上に向けてカッターの如き切断手段を突き当てるようにカットすればよい。   FIG. 2 shows a two-stage blow molding (double blow molding) including a heat shrinking process using the preform after molding a normal preform (one having a test tube shape) used for bottle blow molding. The blow molded body (final molded body) having an external shape as shown in FIG. 2 is molded, and the lower portion from the CC portion in FIG. 2 may be finished into a cup-shaped container. Thus, since not only the cup body 1 but also the flange 2 is stretched, the entire container can be kept transparent while improving the heat resistance. In order to finish the lower part of the final molded body shown in FIG. 2 into a cup-shaped container, it may be cut in the horizontal direction with CC as a boundary in FIG. What is necessary is just to cut so that cutting | disconnection means like a cutter may contact | abut on the site | part corresponding to a flange toward the top from the bottom.

ここに、ダブルブロー成形により耐熱性が改善される理由は、延伸歪(残留応力)を緩和できること、密度の向上を図ることができるからであり、これによって得られたカップ型容器は、90℃程度の温度においても実質的に熱による変形がない。とくにダブルブロー成形によって得られたカップ型容器の胴部は1.380〜1.400g/cm程度の密度が得られる。また、好ましくは、フランの形状や肉厚等を調整することによって、フランジの密度は1.385g/cm以上とする。 Here, the reason why the heat resistance is improved by double blow molding is that the stretching strain (residual stress) can be relaxed and the density can be improved. Even at a certain temperature, there is substantially no deformation due to heat. In particular, the body portion of the cup-type container obtained by double blow molding has a density of about 1.380 to 1.400 g / cm 3 . Further, preferably, by adjusting the flange shape and thickness, etc., the density of the flange to 1.385 g / cm 3 or more.

本発明にしたがってカップ型容器を製造するには、押出し成形、射出成形あるいは圧縮成形によって得られた成形体(プリフォーム)を100〜120℃まで加熱し、一次金型内で延伸倍率7〜12倍でブロー成形(一次ブロー成形)を行う。次いで一次ブロー成形にて得られた中間成形体に加熱処理を施して一次ブロー成形の際の延伸歪を緩和し密度を向上させたのち、150〜220℃の温度域に加熱した一次ブロー成形によって得られた中間成形体を二次金型にてブロー成形(二次ブロー成形)を行い最終形状とする。かかる延伸加工により、延伸加工が施された部分(容器の胴部)は耐熱強度が高まる。   In order to produce a cup-shaped container according to the present invention, a molded body (preform) obtained by extrusion molding, injection molding or compression molding is heated to 100 to 120 ° C., and the draw ratio is 7 to 12 in the primary mold. Double blow molding (primary blow molding). Next, the intermediate molded body obtained by the primary blow molding is subjected to heat treatment to relieve the stretching distortion during the primary blow molding and improve the density, and then the primary blow molding heated to a temperature range of 150 to 220 ° C. The obtained intermediate molded body is blow-molded (secondary blow molding) with a secondary mold to obtain a final shape. By this stretching process, the heat-resistant strength of the stretched part (the body of the container) is increased.

上記の製造過程において形成される中間成形体は、最終成形体の形状よりも大きく成形されるものであり、加熱処理工程で最終成形体と同等か若干小さい形状にまで形成される。そして、二次ブロー成形ではほとんど延伸が行われない状態で最終成形体とするものである。また、上記の延伸倍率とは、縦方向(軸方向)の延伸倍率と横方向(径方向)の延伸倍率との積で表すものとする。   The intermediate formed body formed in the above manufacturing process is formed larger than the shape of the final formed body, and is formed into a shape that is equal to or slightly smaller than the final formed body in the heat treatment step. And in secondary blow molding, it is set as a final molded object in the state which hardly stretches. Moreover, said draw ratio shall be represented by the product of the draw ratio of a vertical direction (axial direction) and the draw ratio of a horizontal direction (radial direction).

本発明にしたがう容器は、熱水シャワーによる殺菌が可能であるだけでなく、内容物の温度が90℃にも及ぶような高温充填に十分耐え得るものであり、とくに飲料用容器に適する。   The container according to the present invention not only can be sterilized by hot water shower, but can sufficiently withstand high temperature filling such that the temperature of the contents reaches 90 ° C., and is particularly suitable for beverage containers.

合成樹脂としてはポリエチレンテレフタレート樹脂の他、ポリエチレンナフタレートやポリトリメチレンテレフタレート等の樹脂を適用することができる。また、ガスバリア性を必要とする内容物に対してはガスバリア層を有する積層体を用いてもよい。ガスバリア層を構成する樹脂としてはポリアミドやエチレンビニルアルコール共重合体、酸素吸収ポリマー等が使用できる。   As the synthetic resin, a resin such as polyethylene naphthalate or polytrimethylene terephthalate can be used in addition to the polyethylene terephthalate resin. Moreover, you may use the laminated body which has a gas barrier layer with respect to the content which requires gas barrier property. As the resin constituting the gas barrier layer, polyamide, ethylene vinyl alcohol copolymer, oxygen absorbing polymer, or the like can be used.

ボトルのブロー成形に通常用いられる試験管形状をなす(PET樹脂製)プリフォームを用い下記の条件のもとでブロー成形を行い、得られたカップ型容器(口径71mm、容量220ml)の耐熱性の改善状況について調査(80℃、85℃、90℃に設定した恒温槽へ5分間放置)を行った。   Blow molding is performed under the following conditions using a preform (made of PET resin) having a test tube shape usually used for blow molding of bottles, and heat resistance of the obtained cup-shaped container (caliber 71 mm, capacity 220 ml) The improvement situation was investigated (5 minutes in a thermostat set at 80 ° C., 85 ° C., 90 ° C.).

条件:
一次ブロー成形: プリフォーム加熱温度100℃、金型温度130℃、
延伸倍率10倍
加熱処理 : 一次ブロー成形体(中間成形体)温度197℃、
二次ブロー成形: 金型温度85℃
conditions:
Primary blow molding: preform heating temperature 100 ° C, mold temperature 130 ° C,
Stretch ratio 10 times
Heat treatment: Primary blow molded body (intermediate molded body) temperature of 197 ° C.,
Secondary blow molding: Mold temperature 85 ℃

その結果、本発明にしたがって製造されたカップ型容器は製品品質に影響を及ぼすような変形は見られないことが確認された。   As a result, it was confirmed that the cup-shaped container manufactured according to the present invention was not deformed so as to affect the product quality.

白化処理を施す必要なしに容器全体の耐熱性の改善を図り得るフランジ付きのカップ型容器が提供できる。   It is possible to provide a cup-shaped container with a flange that can improve the heat resistance of the entire container without the need for whitening treatment.

本発明にしたがうカップ型容器の外観斜視図である。It is an external appearance perspective view of the cup-shaped container according to this invention. 本発明にしたがうカップ型容器の製造に適したブロー成形後の成形体(最終成形体)の側面を示した図である。It is the figure which showed the side surface of the molded object (final molded object) after blow molding suitable for manufacture of the cup-shaped container according to this invention.

符号の説明Explanation of symbols

1 カップ本体
1a 底壁
1b 環状周壁
2 フランジ
1 cup body 1a bottom wall 1b annular peripheral wall 2 flange

Claims (1)

底壁の縁部に容器の胴部を形成する環状周壁を一体的に連結してその内側領域に内容物の充填空間を区画形成するカップ本体と、このカップ本体の上端開口部に配設されたフランジとを備えた合成樹脂製のカップ型容器であって、
前記カップ本体を、フランジとともにブロー成形によって成形してなり、
前記フランジは、ブロー成形の際にカップ本体とともに延伸を伴うものであり、
前記ブロー成形が、成形体の加熱処理を挟む前後二回のブロー成形によるものであり、
前記カップ型容器は、ポリエチレンテレフタレート樹脂の単一素材からなり、
前記胴部の密度は1.380〜1.400g/cm であり、前記フランジの密度は1.385g/cm 以上であることを特徴とする合成樹脂製のカップ型容器。
A cup body that integrally connects an annular peripheral wall that forms the body of the container to the edge of the bottom wall to define a filling space for the contents in the inner region thereof, and is disposed in the upper end opening of the cup body. A cup-shaped container made of synthetic resin with a flange,
The cup body is formed by blow molding together with a flange,
The flange is accompanied by stretching together with the cup body during blow molding,
The blow molding state, and are not due to the blow molding before and after twice interposing the heat treatment of the molded body,
The cup-shaped container is made of a single material of polyethylene terephthalate resin,
A density of the trunk is 1.380 to 1.400 g / cm 3 , and a density of the flange is 1.385 g / cm 3 or more .
JP2008142655A 2008-05-30 2008-05-30 Synthetic resin cup-type container and method for producing the cup-type container Active JP5345804B2 (en)

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JPS6025734A (en) * 1983-07-22 1985-02-08 Nissei Ee S B Kikai Kk Manufacture of can barrel of synthetic resin
JPS60171124A (en) * 1984-02-15 1985-09-04 Yoshino Kogyosho Co Ltd Process of biaxially oriented drawing blow molding
JPH0767732B2 (en) * 1985-08-01 1995-07-26 株式会社吉野工業所 Biaxial stretch blow molding method
JP2002347147A (en) * 2001-05-25 2002-12-04 Kyoraku Co Ltd Multilayer container and method for producing the same

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