JP5284601B2

JP5284601B2 - Plastic plastic blow container

Info

Publication number: JP5284601B2
Application number: JP2007138071A
Authority: JP
Inventors: 孝之後藤
Original assignee: Yoshino Kogyosho Co Ltd
Current assignee: Yoshino Kogyosho Co Ltd
Priority date: 2007-05-24
Filing date: 2007-05-24
Publication date: 2013-09-11
Anticipated expiration: 2027-05-24
Also published as: JP2008290746A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blow-molded container designed so that deformation resulting from decompression can be effectively absorbed without using a decompression absorbing panel. <P>SOLUTION: The synthetic resin blow container has a mouth 1 for discharging its contents, and is formed so that a neck 2 continuous with the mouth 1, a shoulder 3, a body 4, and a bottom 5 are integrated. In this blow container, the lower area of the barrel 4 and the bottom 5 continuous with this area are formed from: an external layer 6 forming the external appearance of the container; and an internal layer 8 disposed inside the external layer 6 via the intermediate layer 7 so that as the pressure in the container decreases, the internal layer 8 can be peeled from the internal wall of the external layer 6, with the intermediate layer 7 as their boundary, and thus the container capacity can be decreased. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、合成樹脂製のブロー容器に関するものであり、とくに減圧に伴う容器の形状変形を減圧吸収パネルに頼ることなしに効果的に回避しようとするものである。 The present invention relates to a blow container made of synthetic resin, and in particular intends to effectively avoid deformation of the container accompanying decompression without relying on a decompression absorption panel.

ペットボトルに代表される合成樹脂製のボトルは、軽量で取り扱いが容易であり、また、透明性を確保することが可能であることからガラス製の容器に比較して遜色のない外観を呈すること、しかも、コスト的にも安価であることから、近年、食品や飲料、化粧料あるいは薬剤等を充填する容器として多用されている。 Synthetic resin bottles such as plastic bottles are lightweight, easy to handle, and can be transparent, so they have an appearance comparable to glass containers. In addition, because of its low cost, it has been frequently used in recent years as a container for filling foods, beverages, cosmetics, drugs, and the like.

また、この種の容器においては、耐熱強化を図り温度の比較的高い内容物の充填を可能とした容器も多数存在している。 In addition, in this type of container, there are many containers that can be filled with contents having a relatively high temperature by strengthening the heat resistance.

とくに、耐熱強化を図った合成樹脂製のブロー容器は、内容物を充填した後の冷却過程で容器内が減圧されるため、それに伴う容器の外観形状の変形を抑制することを目的として容器の胴体部分には予め減圧吸収用のパネルが設けられているのが普通であるところ（例えば、特許文献1参照）、該減圧吸収用のパネルの存在は容器の剛性等の物性に影響するのみならず、容器の装飾や外観形状等のデザインに制限が加えられる要因の一つにもなっており、その解決が求められていた。
特許第3608420号明細書 In particular, the blow container made of synthetic resin with enhanced heat resistance is depressurized in the cooling process after filling the contents. Normally, the body portion is preliminarily provided with a vacuum absorbing panel (see, for example, Patent Document 1). The presence of the vacuum absorbing panel only affects physical properties such as the rigidity of the container. In addition, it has become one of the factors that impose restrictions on the design of the container decoration and appearance, and there has been a need for a solution.
Patent No. 3608420 specification

本発明の課題は、容器の装飾や外観形状等のデザインに制限を及ぼす一因となっていた減圧吸収パネルに頼ることなしに減圧に伴う形状変形を吸収し得る新規な合成樹脂製のブロー容器を提案するところにある。 An object of the present invention is to provide a novel synthetic resin blow container capable of absorbing shape deformation caused by decompression without relying on a decompression absorption panel that has been a factor in limiting the design of the decoration and appearance of the container. There is a place to propose.

本発明は、内容物を注出する口部を有し、この口部に続く頸部、肩部、胴部及び底部を一体成形してなる合成樹脂製のブロー容器であって、
前記胴部の前記肩部と前記底部との中間よりも下方側の下側領域とこれに連続する底部が、容器の外観形状を形作る外層と、この外層の内側に中間層を介して配置され、容器内の減圧にしたがい該中間層を境にして外層の内壁より剥離、減容可能な内層からなり、
前記外層と前記内層が同一の材質で形成され、前記中間層の上端部よりも上方で前記外層と前記内層が互いに合流して前記胴部の上側領域が単一層に形成されるとともに、
前記中間層の下端部が前記底部において外部に露出し、前記外層の底壁の、該中間層の下端部と前記外層の下端部との間に、前記中間層と前記外層との相互間に外気を導入するためのエアー導入孔が設けられていることを特徴とする合成樹脂製ブロー容器である。 The present invention has a mouth part for pouring the contents, and is a blow container made of synthetic resin formed by integrally molding the neck part, the shoulder part, the trunk part and the bottom part following the mouth part,
A lower region below the middle between the shoulder portion and the bottom portion of the trunk portion and a bottom portion continuous therewith are arranged on the outer layer that forms the external shape of the container, and on the inner side of the outer layer via the intermediate layer. The inner layer can be separated from the inner wall of the outer layer with the intermediate layer as a boundary in accordance with the reduced pressure in the container.
The outer layer and the inner layer are formed of the same material, the outer layer and the inner layer merge with each other above the upper end of the intermediate layer, and the upper region of the trunk is formed as a single layer,
The lower end of the intermediate layer is exposed to the outside at the bottom, and the bottom wall of the outer layer is between the lower end of the intermediate layer and the lower end of the outer layer, and between the intermediate layer and the outer layer. A synthetic resin blow container having an air introduction hole for introducing outside air.

胴部の下側領域とこれに連続する底部を、容器の外観形状を形作る外層と、この外層の内側に中間層を介して配設された内層からなる積層構造体とし、容器内が減圧した際に該中間層を境にして内層を外層の内壁より剥離、減容させることで減圧に伴う容器外観形状の変形を抑制する。 The lower part of the body part and the bottom part continuing to this are made into a laminated structure consisting of an outer layer forming the outer shape of the container and an inner layer disposed inside this outer layer via an intermediate layer, and the inside of the container is depressurized. At this time, the inner layer is separated from the inner wall of the outer layer with the intermediate layer as a boundary, and the volume of the container is prevented from being deformed due to decompression.

以下、図面を参照して本発明を具体的に説明する。
図1は本発明にしたがう合成樹脂製のブロー容器である。 Hereinafter, the present invention will be specifically described with reference to the drawings.
FIG. 1 is a synthetic resin blow container according to the present invention.

図における1は内容物を注出する口部、2は口部1に続く頸部、3は肩部、4は胴部そして5は底部であり、各部位はプリフォームを所望の条件下でブロー成形することによって一体成形される。 In the figure, 1 is the mouth for pouring the contents, 2 is the neck following mouth 1, 3 is the shoulder, 4 is the torso, and 5 is the bottom. It is integrally formed by blow molding.

上記胴部4（下側領域）及び底部5は、容器の外観形状を形作る外層6と、中間層7を介して配置され、容器内の減圧にしたがい該中間層7を境にして外層6の内壁より剥離、減容可能な内層8からなる少なくとも3層の積層構造体にて構成されており、外層6の底壁6ａ（底部5に相当する部分）には中間層7と外層6との相互間に外気を導入して内層8の剥離、減容を容易ならしめるエアー導入孔hが設けられている。ここに、上記内層8と外層6とは同一の樹脂で構成した場合を例として示してあるため、中間層7の上端部よりも上方では、内層8と外層6が合流して単一層を形成している。 The body 4 (lower region) and the bottom 5 are arranged via an outer layer 6 that forms the outer shape of the container and an intermediate layer 7, and the outer layer 6 is separated from the outer layer 6 with the intermediate layer 7 in accordance with the reduced pressure in the container. It is composed of a laminated structure of at least three layers consisting of an inner layer 8 that can be peeled off and reduced in volume from the inner wall. The bottom wall 6a of the outer layer 6 (corresponding to the bottom 5) has an intermediate layer 7 and an outer layer 6 An air introduction hole h is provided between the outside layers to facilitate separation and volume reduction of the inner layer 8 by introducing outside air between them. Here, the case where the inner layer 8 and the outer layer 6 are made of the same resin is shown as an example, so that the upper layer 8 and the outer layer 6 are joined together to form a single layer above the upper end of the intermediate layer 7. doing.

上記の構成になる容器は、容器内が減圧されるとそれにしたがい内層8が図2に示す如く外層6から剥離、減容するので減圧吸収パネルを設けずとも外観形状に変形をきたすことがない。 In the container having the above configuration, when the inside of the container is depressurized, the inner layer 8 is peeled off from the outer layer 6 and the volume is reduced as shown in FIG. .

外層6、内層8を含め、容器自体を構成する合成樹脂としてはポリエチレンテレフタレート、ポリエチレンナフタレート、ポリアクリロニトリル等の一般的な合成樹脂を用いることができるが、中間層7としては内層6の確実な剥離を誘導するためナイロン、エチレン-ビニルアルコール共重合体、低密度ポリエチレンやポリプロピレン等のオレフィン系樹脂等を適用する。 General synthetic resins such as polyethylene terephthalate, polyethylene naphthalate, polyacrylonitrile, etc. can be used as the synthetic resin constituting the container itself, including the outer layer 6 and the inner layer 8, but the inner layer 6 is a reliable one. Nylon, ethylene-vinyl alcohol copolymer, olefin resin such as low density polyethylene and polypropylene, etc. are applied to induce peeling.

図3は本発明に従うブロー容器を成形するのに好適なプリフォームを示した図である。ブロー成形に用いられるプリフォームはその底部（図3のP側）を樹脂の注入側として射出成型により製造するのが一般的であり、プリフォームの本体部分を形成する樹脂（PET樹脂）を金型のモールドキャビティ内へ射出したのち該樹脂とは種類の異なる樹脂（ナイロン等）を所定の深さLだけ侵入可能に射出することにより、図3に示す如きプリフォームの製造が可能となる。胴部4に減圧吸収パネルを設けることは妨げられない。 FIG. 3 is a view showing a preform suitable for forming a blow container according to the present invention. The preform used for blow molding is generally manufactured by injection molding with the bottom (P side in Fig. 3) as the resin injection side, and the resin (PET resin) that forms the main body of the preform is gold. After injection into the mold cavity of the mold, a different type of resin (nylon or the like) from the resin is injected so as to enter a predetermined depth L, whereby the preform as shown in FIG. 3 can be manufactured. It is not hindered to provide the body part 4 with a reduced pressure absorption panel.

減圧吸収パネルを設けずとも、減圧に伴う変形を吸収することができるブロー容器が提供できる。 A blow container capable of absorbing deformation accompanying decompression can be provided without providing a decompression absorption panel.

本発明にしたがうブロー容器の実施の形態を示した図である。It is the figure which showed embodiment of the blow container according to this invention. 図1に示した容器につき、減圧吸収状態を示した図である。FIG. 2 is a view showing a reduced pressure absorption state for the container shown in FIG. 本発明にしたがうブロー容器の製造に適したプリフォームを示した図である。It is the figure which showed the preform suitable for manufacture of the blow container according to this invention.

Explanation of symbols

1 口部
2 頸部
3 肩部
4 胴部
5 底部
6 外層
6a 底壁
7 中間層
8 内層 1 mouth
2 Neck
3 shoulder
4 Torso
5 Bottom
6 outer layer
6a Bottom wall
7 Middle layer
8 Inner layer

Claims

A blow container made of synthetic resin having a mouth part for pouring the contents, and integrally forming a neck part, a shoulder part, a trunk part and a bottom part following the mouth part,
A lower region below the middle between the shoulder portion and the bottom portion of the trunk portion and a bottom portion continuous therewith are arranged on the outer layer that forms the external shape of the container, and on the inner side of the outer layer via the intermediate layer. The inner layer can be separated from the inner wall of the outer layer with the intermediate layer as a boundary in accordance with the reduced pressure in the container.
The outer layer and the inner layer are formed of the same material, the outer layer and the inner layer merge with each other above the upper end of the intermediate layer, and the upper region of the trunk is formed as a single layer,
The lower end of the intermediate layer is exposed to the outside at the bottom, and the bottom wall of the outer layer is between the lower end of the intermediate layer and the lower end of the outer layer, and between the intermediate layer and the outer layer. A synthetic resin blow container having an air introduction hole for introducing outside air.