JP2004331227A - Biaxially stretched blow molded vessel and method for manufacturing the same - Google Patents

Biaxially stretched blow molded vessel and method for manufacturing the same Download PDF

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JP2004331227A
JP2004331227A JP2004230810A JP2004230810A JP2004331227A JP 2004331227 A JP2004331227 A JP 2004331227A JP 2004230810 A JP2004230810 A JP 2004230810A JP 2004230810 A JP2004230810 A JP 2004230810A JP 2004331227 A JP2004331227 A JP 2004331227A
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annular groove
container
peripheral wall
outer diameter
vessel
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JP4079131B2 (en
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Yosuke Yasuda
洋介 安田
Yoshinori Nemoto
宜典 根本
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a biaxially stretched blow molded vessel, which can satisfactorily ensure rigidity and keeps a groove part in the circumferential wall not locally thickened in a wall thickness distribution in an axial direction of the vessel, and a method for manufacturing the same. <P>SOLUTION: In this biaxially stretched blow molded vessel 20, the outer diameter of an annular groove part 26 in the circumferential wall is made 2.15 to 4.5 times larger than the outer diameter of a part near the lower part of a flange 23 provided in the vessel 20. A manufacturing method for the vessel 20 is also provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、二軸延伸ブロー成形容器及びその製造方法に関するものであり、より詳しくは、剛性を充分に確保できると共に、容器の軸方向の肉厚分布において、周壁の環状溝部が局部的に厚肉となることがない成形性に優れた二軸延伸ブロー成形容器及びその製造方法に関する。   The present invention relates to a biaxially stretch blow-molded container and a method for producing the same. The present invention relates to a biaxially stretch blow-molded container excellent in moldability that does not become meat and a method for producing the same.

プラスチック製容器、例えば、ポリエチレンテレフタレート(PET)等の熱可塑性ポリエステルの二軸延伸ブロー成形容器は、優れた透明性や表面光沢を有すると共に、耐衝撃性、ガスバリヤー性等をも有しており、各種飲料用容器として広く利用されている。   A plastic container, for example, a biaxially stretch blow-molded container of a thermoplastic polyester such as polyethylene terephthalate (PET) has not only excellent transparency and surface gloss but also impact resistance, gas barrier properties, and the like. Widely used as containers for various beverages.

一般に、二軸延伸ブロー成形によるPET容器の製造は、PET樹脂を材料として射出成形により有底のプリフォームを製造し、このプリフォームを所定の延伸温度に予備加熱した後、割り金型に保持すると共に、延伸ロッドにより軸方向に引っ張り延伸し、内部に空気を吹き込むことにより、周方向に膨張延伸させることによってなされるものである。
前記の如く製造されるPET容器においては、容器の剛性を高めるためや、内容物の商品名や原材料等を表示するシュリンクラベルを、容器の周壁に確実に固着できるようにする等の理由から、容器の周壁にその周方向にそって環状溝部が形成されている。
Generally, in the manufacture of a PET container by biaxial stretch blow molding, a preform with a bottom is manufactured by injection molding using PET resin as a material, and the preform is preheated to a predetermined stretching temperature and then held in a split mold. At the same time, the stretching is performed by stretching in the axial direction by the stretching rod and blowing air into the inside to expand and stretch in the circumferential direction.
In the PET container manufactured as described above, in order to increase the rigidity of the container or to ensure that the shrink label indicating the product name or raw material of the contents can be securely fixed to the peripheral wall of the container. An annular groove is formed on the peripheral wall of the container along the circumferential direction.

ところで、従来、PET容器としては、容積が、1.5リットルや2.0リットルのものが主流となっていたが、近年、容積が350ミリリットルや500ミリリットル程度の比較的小容量のPET容器の需要が高まっている。
容積が上記程度の比較的小容量のPET容器を二軸延伸ブロー成形によって製造する場合には、容積が小さくなった分、有底プリフォームの長さ及び径も小さくする必要がある。ところが、充填ラインの打栓機を従来の1.5リットルや2.0リットルの容器と併用するということから、口部及びフランジは、1.5リットルや2.0リットルの容器と同じ外径寸法を有している。単純に有底プリフォームの軸方向の寸法を短くした場合、周方向の延伸倍率が小さくなり、容器の軸方向の肉厚分布において、胴部周壁に設けられた環状溝部が極端に肉厚となる外観不良、また、肉厚部とその周辺部との冷却速度の違いから肉厚部にヒケが発生するという問題がある。
また、その製造方法においても、胴部の環状溝部が最もブロー比が小さくなり、二軸延伸ブロー成形時に容器の環状溝部に対応する部分が金型の凸部に樹脂が引っかかり、その部分の延伸倍率が低下する。
そこで、本発明の目的は、剛性を充分に確保できると共に、容器の軸方向の肉厚分布において、周壁の環状溝部が局部的に厚肉となることのない成形に優れた二軸延伸ブロー成形容器及びその製造方法を提供することにある。
Conventionally, PET containers having a volume of 1.5 liters or 2.0 liters have been the mainstream, but in recent years, PET containers having a relatively small volume of approximately 350 ml or 500 ml have been used. Demand is growing.
When a relatively small volume PET container having the above-mentioned volume is manufactured by biaxial stretch blow molding, it is necessary to reduce the length and diameter of the preform with a bottom for the reduced volume. However, since the capping machine of the filling line is used together with the conventional 1.5 liter or 2.0 liter container, the mouth and the flange have the same outer diameter as the 1.5 liter or 2.0 liter container. It has dimensions. If the axial dimension of the bottomed preform is simply shortened, the stretching ratio in the circumferential direction becomes small, and in the thickness distribution in the axial direction of the container, the annular groove provided on the body peripheral wall is extremely thick. In addition, there is a problem that sink is generated in the thick portion due to poor appearance and a difference in cooling rate between the thick portion and the peripheral portion.
Also, in the manufacturing method, the blow ratio is the smallest in the annular groove portion of the body portion, and the resin corresponding to the annular groove portion of the container is caught by the convex portion of the mold during biaxial stretch blow molding, and the stretch of the portion is performed. Magnification decreases.
Accordingly, an object of the present invention is to provide biaxial stretch blow molding which can secure sufficient rigidity and is excellent in molding such that the annular groove portion of the peripheral wall does not become locally thick in the axial thickness distribution of the container. An object of the present invention is to provide a container and a method for producing the container.

本発明は、前記目的を達成するために提案されたものであって、下記の構成からなることを特徴としている。
すなわち、本発明によれば、周壁が角筒形状であって、各対向する周壁の環状溝部の中央部に、上部周壁と下部周壁に連接し、前記環状溝部よりも低い外方に突出する突部を設け、前記突部の外径が容器のフランジの下部近傍の外径寸法の2.15ないし4.5倍としたことを特徴とする二軸延伸ブロー成形容器。
The present invention has been proposed to achieve the above object, and has the following configuration.
That is, according to the present invention, the peripheral wall has a rectangular cylindrical shape, and is formed at the center of the annular groove portion of each of the opposed peripheral walls so as to be connected to the upper peripheral wall and the lower peripheral wall and project outwardly lower than the annular groove portion. A biaxially stretch blow-molded container, characterized in that the outer diameter of the protrusion is 2.15 to 4.5 times the outer diameter near the lower part of the flange of the container.

また、本発明によれば、周壁が角筒形状であって、各対向する周壁の環状溝部の中央部に、上部周壁と下部周壁に連接し、前記環状溝部よりも低い外方に突出する突部を設け、前記突部の外径が容器のフランジの下部近傍の外径寸法の2.15ないし4.5倍としたことを特徴とする二軸延伸ブロー成形容器の製造方法が提供される。   Further, according to the present invention, the peripheral wall has a rectangular cylindrical shape, and is formed at the center of the annular groove of each of the opposed peripheral walls so as to be connected to the upper peripheral wall and the lower peripheral wall, and to protrude outwardly below the annular groove. Wherein the outer diameter of the protrusion is 2.15 to 4.5 times the outer diameter near the lower part of the flange of the container. .

本発明によれば、剛性を充分に確保できると共に、容器の軸方向の肉厚分布において、周壁の環状溝部が局部的に厚肉とならず、ヒケ等の外観不良が生じることがない二軸延伸ブロー成形容器及びその製造方法が提供される。   ADVANTAGE OF THE INVENTION According to this invention, while ensuring sufficient rigidity, in the axial thickness distribution of a container, the annular groove part of a peripheral wall does not become locally thick, and the two-axis which does not produce appearance defects, such as sink, A stretch blow-molded container and a method for producing the same are provided.

請求項1の発明に係る二軸延伸ブロー成形容器の技術的特徴は、第1図に示されるように周壁を角筒形状とし、各対向する周壁の環状溝部の中央部に、上部周壁と下部周壁に連接し、前記環状溝部よりも低い外方に突出する突部を設け、前記突部の外径が容器のフランジの下部近傍の外径寸法の2.15ないし4.5倍好ましくは2.2ないし3.0となるように製造されている点にある。   The technical feature of the biaxially stretch blow-molded container according to the invention of claim 1 is that, as shown in FIG. 1, the peripheral wall has a rectangular cylindrical shape, and the upper peripheral wall and the lower A projection is provided which is connected to the peripheral wall and protrudes outward below the annular groove, and the outer diameter of the projection is 2.15 to 4.5 times, preferably 2 times, the outer diameter near the lower part of the flange of the container. .2 to 3.0.

上記の如く環状溝部の中央部に設けられた突部を、フランジ下部近傍の外径寸法の2.15ないし4.5倍に設定することにより、角筒形状の容器の軸方向の肉厚分布において、側壁の環状溝部が局部的に厚肉となることがなく、さらに、飲料等が熱間充填され、冷却後、容器内が負圧になった場合に、環状溝部でも良好に負圧を吸収できる。すなわち、環状溝部を境に上下の側壁が各々独立して負圧を吸収するのではなく、上下の側壁が同時に内方へ移動して大きな面として負圧を良好に吸収するようになる。また、突部を設けることにより、負圧の吸収時に環状溝部が折れるのを防止する。   By setting the projection provided at the center of the annular groove as described above to be 2.15 to 4.5 times the outer diameter near the lower portion of the flange, the thickness distribution in the axial direction of the rectangular cylindrical container is obtained. In the case where the annular groove portion of the side wall does not locally become thick, furthermore, the beverage or the like is hot-filled, and after cooling, if the inside of the container becomes a negative pressure, the negative pressure is also favorably applied to the annular groove portion. Can be absorbed. In other words, the upper and lower sidewalls do not independently absorb the negative pressure at the boundary of the annular groove, but the upper and lower sidewalls simultaneously move inward to absorb the negative pressure satisfactorily as a large surface. In addition, the provision of the protrusion prevents the annular groove from breaking when absorbing negative pressure.

そして、各側壁の環状溝部の環状溝部の径方向の深さ寸法Xは、容器の容積等によっても異なるが、1.0ないし6.0mm、特に2.0ないし4.5mmとするのが賦形性と肉厚分布の点で望ましい。また、環状溝部の軸方向の幅寸法Yは、2.0ないし6.0mm、特に3.0ないし4.0mmとするのが、横剛性の点で望ましい。さらに、溝部の形成位置は、ボトルハイト等によっても異なるが、容器の底部から上方へ6ないし13cmとするのが、成形性の点で好ましい。   The radial depth dimension X of the annular groove of each side wall varies depending on the volume of the container and the like, but is preferably 1.0 to 6.0 mm, particularly 2.0 to 4.5 mm. It is desirable in terms of shape and thickness distribution. The width Y in the axial direction of the annular groove is preferably 2.0 to 6.0 mm, particularly preferably 3.0 to 4.0 mm in terms of lateral rigidity. Further, the formation position of the groove varies depending on the bottle height or the like, but is preferably 6 to 13 cm upward from the bottom of the container from the viewpoint of moldability.

また、突部の周方向の長さS2は、互いに対向する側壁の環状溝部の周方向の長さS1よりも短く形成され、その寸法S2は、S1(図2参照)の1/2以下、さらに好ましくはS2/S1が0.46以下とされる。なお、S2がS1の1/3よりも小さいと肉厚分布不良(厚肉化)の傾向にあり、S1の1/2よりも大きいと横剛性低下の傾向にある。   Further, the circumferential length S2 of the protrusion is formed to be shorter than the circumferential length S1 of the annular groove of the side wall facing each other, and the dimension S2 is 1 / or less of S1 (see FIG. 2). More preferably, S2 / S1 is set to 0.46 or less. If S2 is smaller than 1/3 of S1, the thickness distribution tends to be poor (thickening), and if S2 is larger than 1/2 of S1, the lateral rigidity tends to decrease.

さらに突部は、環状溝部の径方向の深さよりも低く、外方に突出しないように突設され、その突出の寸法は、前記突部が形成される環状溝部の深さの30%ないし50%が横剛性の点で望ましい。なお、前記突出の寸法が30%よりも小さいと負圧の吸収時の折れの傾向にあり、50%よりも大きいと横剛性の低下の傾向にある。
また、突部の環状溝に対する周方向の角度α(第2図参照)は150ないし170度、特に、160ないし165度とするのが、賦形性と負圧吸収時の折れ防止の点で好ましい。
Further, the projection is provided so as to be lower than the radial depth of the annular groove so as not to project outward, and the size of the projection is 30% to 50% of the depth of the annular groove in which the projection is formed. % Is desirable in terms of lateral rigidity. If the size of the protrusion is smaller than 30%, there is a tendency for breakage when absorbing negative pressure, and if it is larger than 50%, there is a tendency for lateral rigidity to decrease.
The circumferential angle α (see FIG. 2) of the projection with respect to the annular groove is set to 150 to 170 degrees, particularly 160 to 165 degrees, from the viewpoint of shaping properties and prevention of breakage during absorption of negative pressure. preferable.

さらに、環状溝部の中央部に形成する突部は、周壁を形成する4個の側壁の各々に少なくとも1個形成することが必要であるが、各々の側壁に2個以上設けることもできる。 なお、前記した請求項1の発明では、周壁に溝部が形成されているので、容器の剛性も充分に確保される。また、環状溝部の形状は、特に限定されるものではなく、軸方向に切断した断面形状が、円弧状、U字状、凹状等のものを採用できる。   Further, it is necessary to form at least one protrusion at the center of the annular groove on each of the four side walls forming the peripheral wall, but it is also possible to provide two or more protrusions on each side wall. In the first aspect of the present invention, since the groove is formed in the peripheral wall, the rigidity of the container is sufficiently ensured. Further, the shape of the annular groove is not particularly limited, and a cross-sectional shape cut in the axial direction may be an arc, a U-shape, a concave shape, or the like.

請求項2の発明に係る二軸延伸ブロー成形容器の技術的特徴は、周壁が角筒形状であって、各対向する周壁の環状溝部の中央部に前記環状溝部よりも低い外方に突出する突部を設け、前記突部の内径を容器のフランジ下部近傍の外径寸法の2.15ないし4.5倍に設定することである。
本発明において、容器を形成する材料としては、二軸延伸ブロー成形が可能なプラスチック材料を使用でき、例えば、ポリエチレンテレフタレート、共重合ポリエステル等のポリエステル樹脂やポリオレフィン樹脂を例示できる。
また、本願の二軸延伸ブロー成形容器の容積は特に制限されないが、200ないし900ミリリットル、特に350ないし500ミリリットルの容積の容器を適用することにより、前記効果を顕著に発揮するものである。
The technical feature of the biaxially stretch blow-molded container according to the second aspect of the present invention is that the peripheral wall has a rectangular cylindrical shape, and protrudes outward from the center of the annular groove on each of the opposed peripheral walls, which is lower than the annular groove. A protrusion is provided, and the inner diameter of the protrusion is set to 2.15 to 4.5 times the outer diameter near the lower part of the flange of the container.
In the present invention, as a material for forming the container, a plastic material capable of being subjected to biaxial stretch blow molding can be used, and examples thereof include polyester resins such as polyethylene terephthalate and copolymerized polyester, and polyolefin resins.
The volume of the biaxially stretched blow-molded container of the present invention is not particularly limited, but the above-mentioned effect is remarkably exhibited by using a container having a volume of 200 to 900 ml, particularly 350 to 500 ml.

以下に、図面を参照して本発明の実施例を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

実施例1
図1には請求項に係る二軸延伸ブロー成形容器20が示されている。
本実施例に係る二軸延伸ブロー成形容器20は、口部22の下方にフランジ23、このフランジ23の下方にラベルを固着する上部周壁24、この上部周壁24の下方の環状溝部26を介して底部27を有する下部周囲壁25を一体に形成し、前記周壁24、25が角筒形状で、全体として角筒形状を呈する。21は、ブロー前のパリソン仮想線を示すものである。
そして、前記環状溝部26は上方周壁24と下方周壁25とのほぼ中間に、周方向全体に沿って形成されている。また、環状溝部26の中央部には凸部28が設けられ、上部周壁24および下部周壁25の側壁(図2における25Aないし25D)の対応する位置に、それぞれ突部28Aないし28Dが径方向の外方に向けて、前記環状溝部26から飛び出さないように突設されている。
Example 1
FIG. 1 shows a biaxially stretch blow-molded container 20 according to the claims.
The biaxially stretch blow-molded container 20 according to the present embodiment is provided with a flange 23 below the mouth 22, an upper peripheral wall 24 for fixing a label below the flange 23, and an annular groove 26 below the upper peripheral wall 24. A lower peripheral wall 25 having a bottom portion 27 is integrally formed, and the peripheral walls 24 and 25 have a rectangular cylindrical shape, and have a rectangular cylindrical shape as a whole. 21 indicates a parison virtual line before blowing.
The annular groove 26 is formed substantially midway between the upper peripheral wall 24 and the lower peripheral wall 25 along the entire circumferential direction. In addition, a projection 28 is provided at the center of the annular groove 26, and the projections 28A to 28D are respectively provided at positions corresponding to the side walls (25A to 25D in FIG. 2) of the upper peripheral wall 24 and the lower peripheral wall 25 in the radial direction. The projection is provided outward so as not to protrude from the annular groove portion 26.

本実施例では、前記の二軸延伸ブロー成形容器20において、環状溝部26に設けた凸部28Aと28C間の外径寸法L3が57.6mm、容器20におけるフランジ23の下部近傍の外径寸法L4が26.16mmとなるように形成されている。すなわち本実施例ではL3/L4が2.20に設定されている。
また、本実施例では、環状溝部26の周方向の長さS1を43.7mm、径方向の深さXを2.0mm、軸方向の幅Yを3.0mmに設定した。さらに突部28の周方向の長さS2を20mm、径方向の突出寸法Zを0.8mm、軸方向の幅を4.3mmに設定した。前記の如く構成された二軸延伸ブロー成形容器20では、容器20の軸方向の肉厚分布において、環状溝部26が局部的に厚肉部が形成されることなく、良好な成形がなされた。
In the present embodiment, in the biaxially stretched blow-molded container 20, the outer diameter L3 between the convex portions 28A and 28C provided in the annular groove 26 is 57.6 mm, and the outer diameter near the lower portion of the flange 23 in the container 20. L4 is formed to be 26.16 mm. That is, in this embodiment, L3 / L4 is set to 2.20.
In this embodiment, the circumferential length S1 of the annular groove 26 is set to 43.7 mm, the radial depth X is set to 2.0 mm, and the axial width Y is set to 3.0 mm. Further, the length S2 in the circumferential direction of the protrusion 28 was set to 20 mm, the protrusion Z in the radial direction was set to 0.8 mm, and the width in the axial direction was set to 4.3 mm. In the biaxially stretched blow-molded container 20 configured as described above, in the axial thickness distribution of the container 20, the annular groove portion 26 was formed well without a locally thick portion being formed.

比較例1
環状溝部に設けた突部28の外径寸法L3を56.0mmとすること以外、すなわち、L3/L4を2.14とすること以外は、実施例1と同様の条件下で二軸延伸ブロー成形容器を製造した。得られた容器は環状溝部26において、肉厚分布不良が発生しており、厚肉部が形成されていることが確認された。
Comparative Example 1
Except that the outer diameter L3 of the protrusion 28 provided in the annular groove is set to 56.0 mm, that is, L3 / L4 is set to 2.14, the biaxial stretching blow is performed under the same conditions as in Example 1. A molded container was manufactured. In the obtained container, thickness distribution failure occurred in the annular groove portion 26, and it was confirmed that the thick portion was formed.

本発明の二軸延伸ブロー成形容器の正面図である。It is a front view of the biaxial stretch blow molding container of the present invention. 図1のA−A線における断面図である。It is sectional drawing in the AA line of FIG.

符号の説明Explanation of reference numerals

20:二軸延伸ブロー成形容器
23:フランジ
24:上部周壁
25:下部周壁
26:環状溝部
28:凸部






20: biaxially stretch blow molded container 23: flange 24: upper peripheral wall 25: lower peripheral wall 26: annular groove 28: convex portion






Claims (2)

周壁が角筒形状であって、各対向する周壁の環状溝部の中央部に、上部周壁と下部周壁に連接し、前記環状溝部よりも低い外方に突出する突部を設け、前記突部の外径が容器のフランジの下部近傍の外径寸法の2.15ないし4.5倍としたことを特徴とする二軸延伸ブロー成形容器。 The peripheral wall has a rectangular cylindrical shape, and at the center of the annular groove of each of the opposed peripheral walls, a projection is provided which is connected to the upper peripheral wall and the lower peripheral wall and projects outwardly lower than the annular groove. A biaxially stretch blow-molded container, wherein the outer diameter is 2.15 to 4.5 times the outer diameter near the lower part of the flange of the container. 周壁が角筒形状であって、各対向する周壁の環状溝部の中央部に、上部周壁と下部周壁に連接し、前記環状溝部よりも低い外方に突出する突部を設け、前記突部の外径が容器のフランジの下部近傍の外径寸法の2.15ないし4.5倍としたことを特徴とする二軸延伸ブロー成形容器の製造方法。



















The peripheral wall has a rectangular cylindrical shape, and at the center of the annular groove of each of the opposed peripheral walls, a projection is provided which is connected to the upper peripheral wall and the lower peripheral wall and projects outwardly lower than the annular groove. A method for producing a biaxially stretch blow-molded container, wherein the outer diameter is 2.15 to 4.5 times the outer diameter near the lower part of the flange of the container.



















JP2004230810A 2004-08-06 2004-08-06 Biaxial stretch blow molded container and manufacturing method thereof Expired - Fee Related JP4079131B2 (en)

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JP21378397A Division JPH10305478A (en) 1997-05-02 1997-05-02 Biaxially oriented blow molded container and its manufacture

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