JPH0719783Y2 - Plastic container - Google Patents
Plastic containerInfo
- Publication number
- JPH0719783Y2 JPH0719783Y2 JP1992042479U JP4247992U JPH0719783Y2 JP H0719783 Y2 JPH0719783 Y2 JP H0719783Y2 JP 1992042479 U JP1992042479 U JP 1992042479U JP 4247992 U JP4247992 U JP 4247992U JP H0719783 Y2 JPH0719783 Y2 JP H0719783Y2
- Authority
- JP
- Japan
- Prior art keywords
- plastic container
- parison
- present
- molded
- blow
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本考案はプラスチック容器の形状
に関するものであり、特に二軸延伸ブロー成形されたプ
ラスチック容器の形状に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the shape of a plastic container, and more particularly to the shape of a biaxially stretch blow molded plastic container.
【０００２】[0002]
【従来の技術】プラスチック容器を二軸延伸ブロー成形
する場合には、まずパリソンを射出成形し、その後にプ
レブロー、本ブローの工程を経て最終形状となる。この
パリソン成形用の金型としては、従来から図３に示すよ
うにリップ型１と胴型２とから構成されたものが使用さ
れていた。この胴型２としては壺型が用いられているた
め、パリソンの外周面は型抜けを良くするために単純な
テーパ状とされていた。またパリソンの口部はほぼその
まま最終製品形状となるため、パリソンの口部内径は変
更できない場合がほとんどであった。2. Description of the Related Art When a plastic container is biaxially stretch blow-molded, a parison is first injection-molded, followed by pre-blowing and main-blowing to obtain a final shape. As a mold for molding the parison, a mold composed of a lip mold 1 and a body mold 2 as shown in FIG. 3 has been conventionally used. Since the vase type is used as the body type 2, the outer peripheral surface of the parison is formed into a simple tapered shape in order to improve the mold release. Further, since the mouth of the parison is almost the same as the final product shape, the inner diameter of the mouth of the parison cannot be changed in most cases.
【０００３】このため、製品肉厚等の関係からパリソン
を肉厚としたい場合には、図３に示すように口部内径を
一定に保ったまま、パリソンの内側に段部３を形成する
ことによりそれ以下の部分を肉厚化する方法が取られて
いた。ところが、このような形状のパリソンをブロー成
形すると、ブローエアーによって段部３が局部的に冷却
される。その結果、ブロー成形されたプラスチック容器
の口部から肩部の内表面が荒れ、特に透明性のあるポリ
オレフィン系樹脂容器の場合にはその部分の気中透過率
が低下する欠点があった。また上記の局部的な冷却によ
ってパリソンが伸びにくくなり、ブロー成形されたプラ
スチック容器の口部から肩部に不必要な肉が着くという
欠点もあった。For this reason, when it is desired to make the parison thick due to the thickness of the product, the stepped portion 3 should be formed inside the parison while keeping the inner diameter of the mouth constant as shown in FIG. Has adopted a method of thickening the portion below that. However, when the parison having such a shape is blow-molded, the step portion 3 is locally cooled by the blow air. As a result, the inner surface of the shoulder portion of the blow-molded plastic container is roughened, and particularly in the case of a transparent polyolefin resin container, there is a drawback that the air permeability of the portion is lowered. Further, there is a drawback that the parison becomes difficult to expand due to the local cooling, and unnecessary meat is attached to the shoulder portion from the mouth portion of the blow-molded plastic container.
【０００４】[0004]
【考案が解決しようとする課題】本考案は上記した従来
の問題点を解決し、パリソンを肉厚化した場合にも口部
から肩部の気中透過率が低下したり、口部から肩部に不
必要な肉が着くことのないプラスチック容器を提供する
ために完成されたものである。The present invention solves the above-mentioned problems of the prior art, and even when the thickness of the parison is increased, the air permeability from the mouth to the shoulder decreases, and the mouth to the shoulder decreases. It has been completed to provide a plastic container that does not have unnecessary meat on its part.
【０００５】[0005]
【課題を解決するための手段】上記の課題を解決するた
めになされた本考案は、容器首部のうち、リップ型によ
り成形された部分の直下の位置に、ブロー成形の際に局
部的に冷却されることなく延伸されて外側に張り出した
環状肉厚部を形成したことを特徴とするプラスチック容
器を要旨とするものである。DISCLOSURE OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, provides a container neck portion which is directly below a portion formed by a lip mold and which is locally formed during blow molding.
The gist of the present invention is to provide a plastic container characterized in that an annular thick portion is formed which is stretched and projected outward without being partially cooled .
【０００６】[0006]
【実施例】以下に本考案を図示の実施例によって更に詳
細に説明する。図１は本考案のプラスチック容器の一例
を示す断面図、図２はそのパリソン成形工程を示す断面
図である。図２に示されるように、本考案のプラスチッ
ク容器を成形するためのパリソンは従来と同様にリップ
型１と胴型２とから構成された金型内で射出成形される
のであるが、リップ型１により成形される直下の位置か
らパリソンが外側に張り出した形状とされている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the embodiments shown in the drawings. FIG. 1 is a sectional view showing an example of the plastic container of the present invention, and FIG. 2 is a sectional view showing the parison molding process. As shown in FIG. 2, the parison for molding the plastic container of the present invention is injection-molded in a mold composed of a lip mold 1 and a body mold 2 as in the conventional case. The parison has a shape protruding outward from the position immediately below the position formed by 1.
【０００７】またこのような形状のパリソンを常法によ
りブロー成形して得られた本考案のプラスチック容器
は、図１に示されるようにパリソン成形の際にリップ型
１により成形された首の部分５の直下の位置に、ブロー
成形の際に局部的に冷却されることなく延伸されて外側
に張り出された環状肉厚部４が形成されたものとなる。
なお、環状肉厚部４よりも下側の部分６はブロー成形の
際に延伸され、薄肉となっている。Further, the plastic container of the present invention obtained by blow molding a parison of such a shape by a conventional method has a neck portion molded by a lip mold 1 at the time of parison molding as shown in FIG. Blow to a position just below 5.
At the time of molding, the annular thick portion 4 is formed which is stretched without being locally cooled and is projected outward.
The portion 6 below the annular thick portion 4 is thinned by being stretched during blow molding.
【０００８】[0008]
【作用】このように構成された本考案のプラスチック容
器は、内面に従来のような突出した段部のないパリソン
から成形されたものであるので、ブロー成形の際にパリ
ソン内面が局部的に冷却されることがなく、透明なポリ
オレフィン系樹脂容器の場合にも気中透過率が低下する
ことがない。また本考案のプラスチック容器は、ブロー
エアーによりパリソン内面が局部的に冷却されないため
に均一に伸び易く、従来のようにブロー成形されたプラ
スチック容器の口部から肩部に不必要な肉が着くことも
ない。The plastic container of the present invention thus constructed is molded from a parison without a projecting step as in the prior art, so that the inner surface of the parison is locally cooled during blow molding. In the case of a transparent polyolefin resin container, the air permeability does not decrease. In addition, the plastic container of the present invention tends to stretch uniformly because the inner surface of the parison is not locally cooled by the blow air, and unnecessary meat may stick to the shoulder from the mouth of the blow molded plastic container. Nor.
【０００９】なお、図２に示すパリソンから成形された
本考案のプラスチック容器と、図３に示す従来のパリソ
ンから成形された従来のプラスチック容器とについて、
肉厚を同一とした場合の肩部の気中透過率を比較した。
その結果、従来品では肩部の気中透過率は５０％であっ
たのに対して、本考案品では６０％であり、より高い透
明性を得ることができた。Regarding the plastic container of the present invention molded from the parison shown in FIG. 2 and the conventional plastic container molded from the conventional parison shown in FIG. 3,
The air permeability of the shoulder was compared when the thickness was the same.
As a result, in the conventional product, the air permeability of the shoulder was 50%, whereas in the product of the present invention, it was 60%, and higher transparency could be obtained.
【００１０】[0010]
【考案の効果】以上に説明したように、本考案のプラス
チック容器は、容器首部のうちのリップ型により成形さ
れた部分の直下の位置に、ブロー成形の際に局部的に冷
却されることなく延伸されて外側に張り出した環状肉厚
部を形成したことにより、ブロー成形の際のパリソン内
面の局部的な冷却を防止し、これによって肩部付近の気
中透過率の向上と、肉厚の均一化を図ることに成功した
ものである。このように本考案は、特に透明なポリオレ
フィン系樹脂等を原料として二軸延伸成形されたプラス
チック容器に適したものであり、その実用的価値はきわ
めて大きいものである。As described above, the plastic container of the present invention is locally cooled at the time of blow molding at a position just below the portion of the container neck formed by the lip type.
By forming an annular thick portion that is stretched without being rejected and bulges outward, local cooling of the inner surface of the parison during blow molding is prevented, which improves air permeability near the shoulder. And, we succeeded in achieving uniform wall thickness. As described above, the present invention is particularly suitable for a biaxially stretched plastic container made of a transparent polyolefin resin or the like, and its practical value is extremely large.
【図１】本考案のプラスチック容器の一例を示す断面図
である。FIG. 1 is a sectional view showing an example of a plastic container of the present invention.
【図２】本考案のプラスチック容器のパリソン成形工程
を示す断面図である。FIG. 2 is a sectional view showing a parison molding process of the plastic container of the present invention.
【図３】従来のプラスチック容器のパリソン成形工程を
示す断面図である。FIG. 3 is a cross-sectional view showing a conventional parison molding process for a plastic container.
１ リップ型 ２ 胴型 ３ 段部 ４ 環状肉厚部 1 Lip type 2 Body type 3 Step part 4 Annular thick part
Claims (1)
れた部分の直下の位置に、ブロー成形の際に局部的に冷
却されることなく延伸されて外側に張り出した環状肉厚
部を形成したことを特徴とするプラスチック容器。1. A container neck is locally cooled at a position immediately below a portion formed by a lip mold, and is locally cooled during blow molding.
A plastic container characterized in that an annular thick portion is formed that is stretched without being rejected and projects outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992042479U JPH0719783Y2 (en) | 1992-06-19 | 1992-06-19 | Plastic container |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1992042479U JPH0719783Y2 (en) | 1992-06-19 | 1992-06-19 | Plastic container |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH063343U JPH063343U (en) | 1994-01-18 |
| JPH0719783Y2 true JPH0719783Y2 (en) | 1995-05-10 |
Family
ID=12637204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1992042479U Expired - Lifetime JPH0719783Y2 (en) | 1992-06-19 | 1992-06-19 | Plastic container |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0719783Y2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003104404A (en) * | 2001-09-28 | 2003-04-09 | Aoki Technical Laboratory Inc | Resin tube container and preform thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6019410U (en) * | 1983-07-19 | 1985-02-09 | 株式会社吉野工業所 | Primary molded product made of polyethylene terephthalate resin |
| JPH0688322B2 (en) * | 1990-07-30 | 1994-11-09 | 株式会社青木固研究所 | Core mold for high temperature mold release of preform |
| JPH0684038B2 (en) * | 1990-10-27 | 1994-10-26 | 日精エー・エス・ビー機械株式会社 | Preform for forming container with hanging device and method for forming container with hanging device |
-
1992
- 1992-06-19 JP JP1992042479U patent/JPH0719783Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH063343U (en) | 1994-01-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19970523 |
|
| EXPY | Cancellation because of completion of term |