JP4079131B2 - Biaxial stretch blow molded container and manufacturing method thereof - Google Patents
Biaxial stretch blow molded container and manufacturing method thereof Download PDFInfo
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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 stretched blow molded container and a method for producing the same, and more specifically, sufficient rigidity can be secured, and the annular groove portion of the peripheral wall is locally thick in the axial thickness distribution of the container. The present invention relates to a biaxially stretched 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。 Plastic containers such as biaxial stretch blow molded containers made of thermoplastic polyester such as polyethylene terephthalate (PET) have excellent transparency and surface gloss, as well as impact resistance and gas barrier properties. It is widely used as a container 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 PET containers by biaxial stretch blow molding, a bottomed preform 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, it is stretched and stretched in the circumferential direction by pulling and stretching in the axial direction with a stretching rod and blowing air into the inside.
In the PET container manufactured as described above, in order to increase the rigidity of the container or to ensure that the shrink label that displays the product name, raw material, etc. of the contents can be securely fixed to the peripheral wall of the container, An annular groove is formed along the circumferential direction of the peripheral wall of the container.
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。
By the way, conventional PET containers with a volume of 1.5 liters or 2.0 liters have been the mainstream, but in recent years, relatively small-capacity PET containers with a volume of about 350 ml or 500 ml have been used. Demand is increasing.
When manufacturing a relatively small volume PET container having the above-mentioned volume by biaxial stretch blow molding, it is necessary to reduce the length and diameter of the bottomed preform as much as the volume is reduced. However, since the plugging machine of the filling line is used in combination with a conventional 1.5 liter or 2.0 liter container, the mouth and flange have the same outer diameter as the 1.5 liter or 2.0 liter container. Have dimensions. When the axial dimension of the bottomed preform is simply shortened, the stretching ratio in the circumferential direction is reduced, and the annular groove provided in the circumferential wall of the trunk portion is extremely thick in the axial thickness distribution of the container. There is a problem in that sink marks are generated in the thick part due to a poor appearance and a difference in cooling rate between the thick part and its peripheral part.
Also in the manufacturing method, the annular groove portion of the body portion has the lowest blow ratio, and the portion 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 that portion is The magnification decreases.
Accordingly, an object of the present invention is to provide a biaxial stretch blow molding which can sufficiently ensure rigidity and is excellent in molding in which the annular groove portion of the peripheral wall does not become thick locally in the axial thickness distribution of the container. It is in providing a container and its manufacturing method.
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 is characterized by comprising the following configurations.
That is, according to the present invention, the peripheral wall has a rectangular tube shape, and is connected to the upper peripheral wall and the lower peripheral wall at the center of the annular groove portion of each opposing peripheral wall and protrudes outwardly lower than the annular groove portion. The biaxially stretched blow-molded container is characterized in that the outer diameter of the protrusion is 2.15 to 4.5 times the outer diameter in the vicinity of 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 tube shape, and is connected to the central portion of the annular groove portion of each opposed peripheral wall and is connected to the upper peripheral wall and the lower peripheral wall and protrudes outwardly lower than the annular groove portion. There is provided a method for producing a biaxially stretched blow-molded container, characterized in that the outer diameter of the protrusion is 2.15 to 4.5 times the outer diameter in the vicinity of 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。 According to the present invention, sufficient rigidity can be ensured, and in the axial thickness distribution of the container, the annular groove portion of the peripheral wall does not become thick locally, and appearance defects such as sink marks do not occur. A stretch blow molded container and a method for manufacturing 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 stretched blow molded container according to the invention of claim 1 is that the peripheral wall has a rectangular tube shape as shown in FIG. 1, and the upper peripheral wall and the lower part are formed at the center of the annular groove portion of each opposing peripheral wall. Protrusions connected to the peripheral wall and projecting outwardly lower than the annular groove are provided, and the outer diameter of the protrusions is 2.15 to 4.5 times, preferably 2 times, the outer diameter in the vicinity of the lower portion of the flange of the container. It is in the point of being manufactured to become 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 protrusion provided at the center of the annular groove as described above to 2.15 to 4.5 times the outer diameter near the flange lower portion, the axial thickness distribution of the rectangular tube-shaped container In the case where the annular groove portion of the side wall is not locally thickened, and further, when the beverage is hot filled and the inside of the container becomes negative after cooling, the negative pressure is also favorably applied to the annular groove portion. Can absorb. That is, the upper and lower side walls do not independently absorb negative pressure with the annular groove as a boundary, but the upper and lower side walls simultaneously move inward to absorb negative pressure well as a large surface. Moreover, by providing the protrusion, the annular groove is prevented from being broken when the negative pressure is absorbed.
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。 Further, the radial depth X of the annular groove portion of each side wall varies depending on the volume of the container and the like, but it is 1.0 to 6.0 mm, particularly 2.0 to 4.5 mm. Desirable in terms of shape and thickness distribution. Further, the axial width dimension Y of the annular groove is preferably 2.0 to 6.0 mm, particularly 3.0 to 4.0 mm from the viewpoint of lateral rigidity. Furthermore, although the formation position of a groove part changes with bottle height etc., it is preferable from the point of a moldability to set it as 6 thru | or 13 cm upward from the bottom part of a container.
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 shorter than the circumferential length S1 of the annular groove portions of the opposing side walls, and the dimension S2 is 1/2 or less of S1 (see FIG. 2), More preferably, S2 / S1 is 0.46 or less. When S2 is smaller than 1/3 of S1, the thickness distribution tends to be poor (thickening), and when it is larger than 1/2 of S1, the lateral rigidity tends to be lowered.
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 protrusion is lower than the depth of the annular groove in the radial direction, and protrudes so as not to protrude outward. The protrusion has a dimension of 30% to 50% of the depth of the annular groove where the protrusion is formed. % Is desirable in terms of lateral rigidity. In addition, when the dimension of the protrusion is smaller than 30%, there is a tendency to break when absorbing negative pressure, and when it is larger than 50%, the lateral rigidity tends to be lowered.
Further, the circumferential angle α (see FIG. 2) of the protrusion with respect to the annular groove is 150 to 170 degrees, particularly 160 to 165 degrees, in terms of shaping and prevention of breakage when absorbing 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。 Furthermore, it is necessary to form at least one protrusion on the central portion of the annular groove portion on each of the four side walls forming the peripheral wall, but two or more protrusions may be provided on each side wall. In the first aspect of the invention, since the groove portion is formed in the peripheral wall, the rigidity of the container is sufficiently secured. In addition, the shape of the annular groove is not particularly limited, and a cross-sectional shape cut in the axial direction may be an arc shape, 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 stretched blow-molded container according to the invention of claim 2 is that the peripheral wall has a rectangular tube shape, and protrudes outwardly lower than the annular groove part at the center part of the annular groove part of each opposing peripheral wall. Protrusion is provided, and the inner diameter of the protrusion is set to 2.15 to 4.5 times the outer diameter in the vicinity of the lower flange portion of the container.
In the present invention, a plastic material capable of biaxial stretch blow molding can be used as a material for forming the container, and examples thereof include polyester resins such as polyethylene terephthalate and copolymer polyester, and polyolefin resins.
Further, the volume of the biaxially stretched blow molded container of the present application is not particularly limited, but the effect is remarkably exhibited by applying 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。 Embodiments of the present invention will be described below 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 stretched blow molded
The biaxially stretched blow-molded
And the said
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
In this embodiment, the circumferential length S1 of the
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
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 stretched blow molded container 23: flange 24: upper peripheral wall 25: lower peripheral wall 26: annular groove 28: convex portion
Claims (2)
The peripheral wall is in the shape of a rectangular tube, and is provided at the center of the annular groove portion of each opposed peripheral wall with a protrusion projecting outwardly lower than the annular groove portion, connected to the upper peripheral wall and the lower peripheral wall, A method for producing a biaxial stretch blow molded container, wherein the outer diameter is 2.15 to 4.5 times the outer diameter in the vicinity of the lower part of the flange of the container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004230810A JP4079131B2 (en) | 2004-08-06 | 2004-08-06 | Biaxial stretch blow molded container and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004230810A JP4079131B2 (en) | 2004-08-06 | 2004-08-06 | Biaxial stretch blow molded container and manufacturing method thereof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21378397A Division JPH10305478A (en) | 1997-05-02 | 1997-05-02 | Biaxially oriented blow molded container and its manufacture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004331227A JP2004331227A (en) | 2004-11-25 |
| JP4079131B2 true JP4079131B2 (en) | 2008-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004230810A Expired - Fee Related JP4079131B2 (en) | 2004-08-06 | 2004-08-06 | Biaxial stretch blow molded container and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4079131B2 (en) |
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2004
- 2004-08-06 JP JP2004230810A patent/JP4079131B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004331227A (en) | 2004-11-25 |
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