JPS5892536A - Biaxially stretched plastic bottle - Google Patents
Biaxially stretched plastic bottleInfo
- Publication number
- JPS5892536A JPS5892536A JP56190779A JP19077981A JPS5892536A JP S5892536 A JPS5892536 A JP S5892536A JP 56190779 A JP56190779 A JP 56190779A JP 19077981 A JP19077981 A JP 19077981A JP S5892536 A JPS5892536 A JP S5892536A
- Authority
- JP
- Japan
- Prior art keywords
- neck
- surface layer
- bottle
- crystallized
- plastic bottle
- 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.)
- Pending
Links
- 239000004033 plastic Substances 0.000 title claims abstract description 18
- 229920003023 plastic Polymers 0.000 title claims abstract description 18
- 229920000728 polyester Polymers 0.000 claims abstract description 19
- 239000002344 surface layer Substances 0.000 claims abstract description 18
- 238000000071 blow moulding Methods 0.000 claims abstract description 8
- LLLVZDVNHNWSDS-UHFFFAOYSA-N 4-methylidene-3,5-dioxabicyclo[5.2.2]undeca-1(9),7,10-triene-2,6-dione Chemical compound C1(C2=CC=C(C(=O)OC(=C)O1)C=C2)=O LLLVZDVNHNWSDS-UHFFFAOYSA-N 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 2
- 230000000717 retained effect Effects 0.000 abstract 1
- 210000003739 neck Anatomy 0.000 description 45
- 238000002425 crystallisation Methods 0.000 description 8
- 230000008025 crystallization Effects 0.000 description 8
- 239000012530 fluid Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 238000007789 sealing Methods 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- -1 polyethylene terephthalate Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009998 heat setting Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 235000015067 sauces Nutrition 0.000 description 2
- MMINFSMURORWKH-UHFFFAOYSA-N 3,6-dioxabicyclo[6.2.2]dodeca-1(10),8,11-triene-2,7-dione Chemical group O=C1OCCOC(=O)C2=CC=C1C=C2 MMINFSMURORWKH-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 235000008960 ketchup Nutrition 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
- B29C71/0063—After-treatment of articles without altering their shape; Apparatus therefor for changing crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2949/00—Indexing scheme relating to blow-moulding
- B29C2949/07—Preforms or parisons characterised by their configuration
- B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
- B29C49/06—Injection blow-moulding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6409—Thermal conditioning of preforms
- B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
- B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
- B29C49/6452—Thermal conditioning of preforms characterised by temperature differential through the preform length by heating the neck
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
- B29C49/42—Component parts, details or accessories; Auxiliary operations
- B29C49/64—Heating or cooling preforms, parisons or blown articles
- B29C49/6604—Thermal conditioning of the blown article
- B29C49/6605—Heating the article, e.g. for hot fill
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0041—Crystalline
Abstract
Description
【発明の詳細な説明】
本発明は、２軸弧伸プラスチツクびんに関し、よシ詳細
には、耐熱性と耐衝撃性との組合せく優れた首部を備え
た２軸延伸プラスチツクびんに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to biaxially arc-stretched plastic bottles, and more particularly to biaxially stretched plastic bottles with necks that provide a superior combination of heat and impact resistance.
ポリエチレンテレフタレート等の飽和ポリエステル棚脂
から成るパリソン（プリフォーム）を軸方向に延伸し且
つ金蓋内で流体にょシ周方向に膨張させることにより得
られたプラスチックびんは、その容器胴部が二軸方向に
分子配向されており、透明性、耐衝撃性、ガスバリヤ−
性、軽量性に優れた容器として広く使用されるに至って
いる。A plastic bottle obtained by stretching a parison (preform) made of saturated polyester shelf fat such as polyethylene terephthalate in the axial direction and expanding it in the circumferential direction with fluid in a metal lid, the container body has a biaxial structure. The molecules are oriented in the same direction, making them transparent, impact resistant, and gas barrier.
It has come to be widely used as a container with excellent durability and lightness.
このプラスチックびんに内容物を滅菌した状態で保存す
るために、内容物を熱間充填する場合には、びんの収縮
が生じたり或いはびんが変形したりするという問題があ
る。この問題に関して、二輪方向への分子配向が生じて
いる容器胴部では所謂ヒートセットで高温での寸法安定
性を向上し得るとしても、びんの首部では、このような
分子配向が生じていないため、ヒートセットによる寸法
安定化効果は望めない。しかして、びんの音部が耐熱性
や高温での寸法安定性に欠ける場合には、内容物の熱間
によるオーバーフロー充填に際して音部が変形したり、
或いはびん蓋の打栓に際して、ねじ山ヤサポート・リン
グが変形して、確実な密封が困難となるという問題を生
じる。When hot-filling plastic bottles with contents in order to preserve the contents in a sterile state, there is a problem that the bottles may shrink or become deformed. Regarding this problem, although it is possible to improve the dimensional stability at high temperatures by so-called heat setting in the body of the container, where molecular orientation occurs in the direction of the two wheels, in the neck of the bottle, such molecular orientation does not occur. , no dimensional stabilization effect can be expected by heat setting. However, if the sound part of the bottle lacks heat resistance or dimensional stability at high temperatures, the sound part may become deformed during hot overflow filling of the contents.
Alternatively, when capping a bottle, the thread support ring may be deformed, making it difficult to securely seal the bottle.
飽和ポリエステル樹脂成形品の耐熱性を向上させる手段
として、この成形品を熱処理し、その結晶化度を高める
ことは既によく知られており、このような熱処理を前述
したびんの首部に適用すること４既に提案されている（
特開昭５４−６８５８５号公報）。It is already well known that as a means to improve the heat resistance of saturated polyester resin molded products, the molded products are heat treated to increase their crystallinity, and such heat treatment can be applied to the neck of the bottle mentioned above. 4 Already proposed (
JP-A No. 54-68585).
しかしながら、びんの首部を熱処理により結晶化させる
場合には、耐熱性が向上する反面として、首部が機械的
に脆い構造となシ、耐衝撃性等が著しく低下するという
問題がある。However, when the neck of the bottle is crystallized by heat treatment, although the heat resistance is improved, there is a problem that the neck becomes a mechanically fragile structure and the impact resistance etc. are significantly reduced.
従って、本発明の目的は、耐熱性と耐衝撃性との組合せ
に優れた首部を備えたポリエチレンテレフタレート製２
軸延伸プラスチツクびんを提供するにある。SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a polyethylene terephthalate material with a neck having an excellent combination of heat resistance and impact resistance.
To provide axially stretched plastic bottles.
本発明の他の目的は、内容物を熱間で充填し且つびん蓋
との間に信頼性のある密封構造を形成させるに適し九軽
量性、耐衝撃性プラスチックびんを提供するにある。Another object of the present invention is to provide a lightweight, impact-resistant plastic bottle suitable for hot filling and forming a reliable seal with the bottle lid.
本発明によれば、エチレンテレフタレートを主体とする
ポリエステルのパリソンの２軸延伸ブシー成形により形
成された底部ミ胴部、肩部及び首部を備えたプラスチッ
クびんにおいて、前記首部は密度が１．５６り／ＣＣ以
上となる高結晶化外表面層と密度が１．３５Ｓ’／ｃｃ
以下となる低結晶化内表面層とを備えていることを特徴
とする２軸延伸ブ２スチツクびんが提供される。According to the present invention, in a plastic bottle having a bottom body, a shoulder, and a neck formed by biaxially stretched bushy molding of a polyester parison mainly composed of ethylene terephthalate, the neck has a density of 1.56. Highly crystallized outer surface layer with a density of /CC or more and a density of 1.35S'/cc
A biaxially oriented two-stick bottle is provided, characterized in that it has a low crystallization inner surface layer as follows.
本発明を添付図面に示す具体例に基づき以下に詳細に説
明する。The present invention will be described in detail below based on specific examples shown in the accompanying drawings.
本発明のプラスチックびんの全体の構造を示す第１図に
おいて、このびんはポリエステルにより一体に成形され
た胴部１、胴部の下端に連なる底部２、胴部の上端に連
なる台錐状の肩部３及びこの肩部の上端に連なる首部４
から成っている。このびんは、エチレンテレフタレート
単位を主体とするがリエステルのパリソンを二軸延伸ブ
ロー成形することにより形成され、少なくとも胴部２の
壁を構成するポリエステルは、２軸方向、即ちびん軸方
向とびんの周囲方向く分子配向されている。In FIG. 1 showing the overall structure of the plastic bottle of the present invention, this bottle has a body 1 integrally molded from polyester, a bottom 2 continuous to the bottom end of the body, and a frustum-shaped shoulder continuous to the top end of the body. part 3 and a neck part 4 connected to the upper end of this shoulder part
It consists of This bottle is formed by biaxially stretch blow molding a polyester parison mainly composed of ethylene terephthalate units. The molecules are oriented toward the periphery.
首部４に社、びん口５に密封のため施されるびん蓋（図
示せず）を保持するためのねじ６乃至は段差部７或いは
びん蓋を密封係合させる際びんを保持するためのサポー
トリング８が設けられている０
このびん首部４の断面を拡大して示す第２図において、
本発明のプラスチックびんは、この首部４に、密度が１
．３６ｔ／ｃｃ以上、４９に１．３７Ｐ／ｍ以上となる
高結晶化外表面層９と密度が１．３５ｙ／ａ−以下、特
Ｋ ｔ ３４５ ｔ ／ｌｘ、以下トナル低結晶化内表
面層１０とを備えていることが顕著な特徴である。A screw 6 or a step 7 for holding a bottle cap (not shown) attached to the neck 4 and a seal for sealing the bottle mouth 5, or a support for holding the bottle when sealingly engaging the bottle cap. In FIG. 2, which shows an enlarged cross-section of the bottle neck 4, a ring 8 is provided.
The plastic bottle of the present invention has a density of 1 in the neck portion 4.
．． Highly crystallized outer surface layer 9 with a density of 36 t/cc or more and 1.37 P/m or more in 49 and a low crystallized inner surface layer 10 with a density of 1.35 y/a- or less, especially K t 345 t/lx, or less It is a remarkable feature that it has the following.
即ち、本発明は、びんの首部に、上述した高結晶化外表
面層９と低結晶化内表面１０とを設けると、王冠或いは
金属キャップを確実に密封係合させるために必要な耐熱
変形性、剛性等が得られると共に、落下衝撃、或いは開
栓時の衝撃等によって首部が破損する傾向も完全に解消
し得るという知見に基ずくものである。That is, the present invention provides the above-mentioned highly crystallized outer surface layer 9 and low-crystalline inner surface layer 10 on the neck of the bottle, thereby improving the heat deformation resistance necessary for securely sealingly engaging the crown or metal cap. This is based on the knowledge that not only can rigidity be obtained, but also that the tendency of the neck to be damaged due to dropping impact or impact when opening the bottle can be completely eliminated.
びんに対する蓋類の内、経時密封性の点で最も信頼性の
あるものは、金属製の殻体を用いた王冠やキャップであ
るが、これら金属製の王冠やキャップを用いる場合には
、これらの王冠やキャップと保合するびんの首部も寸法
的に安定な剛体でなけれは確実な密封信頼性は得られな
い。本発明によれば、ｉん首部４の内、王冠やキャップ
と係合するねじ部６、段差部７等が設けられた外周部９
を、高度に結晶化したポリエステルで構成するととＫよ
り、内容物が熱間で充填された場合にも上記各部の熱変
形が防止されると共に、寸法的にも安定なものと、なり
、更に外周部の剛性が向上する結果として高度の密封信
頼性が得られるようになるＯ
また、びんの首部４を構成するポリエステル全体を高度
に結晶化させた場合には、この首部４が機械的に脆い構
造となり、落下衝撃或いは開栓時の衝撃によって首部が
極めて容易に破損するという問題がある。とれに対して
、本発明においては、王冠やキャップと係合しない首部
の内局部１０を低結晶化乃至は未結晶のポリエステルで
形成した九め、密封信頼性等を損うことなしに、落下衝
撃や開栓時の衝撃で首部４が破損する傾向が防止される
。Among the lids for bottles, the most reliable ones in terms of sealing performance over time are crowns and caps that use metal shells. The neck of the bottle, which fits with the crown or cap of the bottle, must also be a dimensionally stable and rigid body to ensure reliable sealing. According to the present invention, the outer peripheral portion 9 of the neck portion 4 is provided with a threaded portion 6 that engages with a crown or a cap, a stepped portion 7, etc.
If it is made of highly crystallized polyester, the above parts will be prevented from being deformed by heat even when the contents are filled hot, and it will also be dimensionally stable. As a result of the increased rigidity of the outer periphery, a high degree of sealing reliability can be obtained.In addition, if the entire polyester constituting the neck 4 of the bottle is highly crystallized, the neck 4 will be mechanically It has a brittle structure, and there is a problem in that the neck part is extremely easily damaged by the impact of dropping or opening the bottle. In order to deal with this, in the present invention, the inner part 10 of the neck that does not engage with the crown or cap is made of low-crystallized or uncrystallized polyester. The tendency of the neck portion 4 to be damaged due to impact or impact when opening the bottle is prevented.
ポリエチレンテレフタレート等の飽和ポリエスチルの結
晶化度は、その密度で表わすことができる。氷見ＩＩＡ
においては、外表面層（外周部）９の密度を１．３６ｆ
／ＣＬ以上とすることが密封信頼性の点で重要であり、
これよりも低い場合には熱間充填時の寸法安定性や剛性
に欠ける結果として、内容物の保存性が低下する傾向が
ある。また、内表面層（内周部）１０の密度を’１．３
５ ｆ ／ｃｒ：、以下とすることは耐衝撃性の点で重
要であって、これよりも大きいときには衝撃による首部
の破損傾向が無視できなくなる。The crystallinity of saturated polyester such as polyethylene terephthalate can be expressed by its density. Himi IIA
In this case, the density of the outer surface layer (outer peripheral part) 9 is 1.36f.
/CL or higher is important from the point of view of sealing reliability.
If it is lower than this, the storage stability of the contents tends to deteriorate as a result of the lack of dimensional stability and rigidity during hot filling. In addition, the density of the inner surface layer (inner peripheral part) 10 is set to '1.3.
5 f /cr: or less is important from the point of view of impact resistance, and if it is larger than this, the tendency of the neck to be damaged by impact cannot be ignored.
本発明において、プラスチックびんの首部に上述した結
晶化特性を与えるには、首部の外表面層（外周部）と内
表面層（内周部ンとの間に、温度勾配戒いは冷却速度勾
配を設けて、熱処理を行う手段が採用される。In the present invention, in order to impart the above-mentioned crystallization characteristics to the neck of a plastic bottle, the temperature gradient precept is the cooling rate gradient between the outer surface layer (outer periphery) and the inner surface layer (inner periphery) of the neck. A method is adopted in which a heat treatment is performed by providing a heat treatment.
ポリエステルの２軸延伸成形びんは、ポリエステルのパ
リソンを、その延伸成形温度において軸方向に機械的に
延伸すると共に金型内で流体のブローにより周方向に膨
張延伸させることにより製造されるが、このパリソンの
成形中、成形後、延伸ブロー中或いは延伸成形後の任意
の段階で、前述した条件での熱処理を行う。Biaxially stretched polyester bottles are manufactured by mechanically stretching a polyester parison in the axial direction at the stretching temperature and expanding and stretching it in the circumferential direction by blowing fluid in a mold. The heat treatment under the above-mentioned conditions is performed during the forming of the parison, after forming, during stretch blowing, or at any stage after stretch forming.
即ち、ポリエステルの結晶化は、その融点直下から、融
点より１０ＤＣ低い温度迄の範囲、具体的には１４０乃
至２１０Ｃの温度範囲で顕著に進行する。本発明におい
ては、首部外周部を上記結晶化温度に十分な結晶化が進
む時間、一般に少なくとも０．５分間維持すると共に、
首部内周部及び貫部以外の部分を上記温度よりも低い温
度に維持するか、或いは上記結晶化温度範囲を、２０秒
以内で低温側に移行するように熱処理する。That is, crystallization of polyester significantly progresses in a temperature range from just below its melting point to a temperature 10 DC lower than its melting point, specifically in a temperature range of 140 to 210C. In the present invention, the outer periphery of the neck is maintained at the above-mentioned crystallization temperature for a sufficient period of time for crystallization to proceed, generally at least 0.5 minutes, and
The inner periphery of the neck and the portions other than the piercing portion are maintained at a temperature lower than the above temperature, or the crystallization temperature range is heat-treated so as to shift to the low temperature side within 20 seconds.
パリソンとしては、ポリエステルの射出成形で製造され
た有底パリソンや、ポリエステルの押出成形で得られた
パイプを所定寸法に裁断し、一端部を圧縮成形により閉
じた有底パリソン等を使用し得る。As the parison, a bottomed parison manufactured by polyester injection molding, a bottomed parison made by cutting a pipe obtained by polyester extrusion molding into a predetermined size and closing one end by compression molding, etc. can be used.
ポリエステルのパリソンは、延伸ブローに先立って、延
伸温度に予備加熱する。この延伸温度とは、用いるポリ
エステルの結晶化温度−よシも低い温度で且つポリエス
テルパリソンの延伸が可能となる温度でｉｂシ、具体的
には８０乃至１３０ｃ。The polyester parison is preheated to the stretching temperature prior to stretch blowing. This stretching temperature is a temperature lower than the crystallization temperature of the polyester used and at which the polyester parison can be stretched, specifically, from 80 to 130 degrees centigrade.
特に９０乃至１１０Ｃの温度が便用される。In particular, temperatures of 90 to 110C are conveniently used.
予備加熱されたパリソンの延伸ブロー成形は、遂次延伸
ブロー成形、或は同時延伸ブロー成形のよう々それ自体
公知の手段で行い得る。例えば前者の場合、パリソンを
比較的小さい圧力での流体吹込み下に軸方向に延伸しく
プレプロ−）、次いで比較的大きい圧力での流体吹込み
下に１容器の周方向への膨張により延伸を行なう。また
、後者の場合には、最初から大きい圧力での流体吹込み
Ｋよる局方向への延伸と軸方向への延伸とを同時に行う
。パリソンの軸方向への延伸は、例えばパリソンの首部
を金蓋とマンドレルとで挾持し、パリノン底部の内面に
延伸棒をあてがい、延伸棒を伸張せしめることＫよシ容
易く行うことができる。Stretch blow molding of the preheated parison can be carried out by means known per se, such as sequential stretch blow molding or simultaneous stretch blow molding. For example, in the former case, the parison is stretched in the axial direction under fluid injection at a relatively low pressure (pre-produced), and then stretched by circumferential expansion of a container under fluid injection at a relatively high pressure. Let's do it. In the latter case, the stretching in the local direction and the stretching in the axial direction are simultaneously performed by blowing fluid K at a high pressure from the beginning. The parison can be easily stretched in the axial direction by, for example, holding the neck of the parison between a metal lid and a mandrel, applying a stretching rod to the inner surface of the bottom of the parison, and stretching the stretching rod.
パリソンの軸方向及び周方向の延伸倍率は、夫々１．５
乃至２．５倍（軸方向）及び１．７乃至４．０倍（周方
向）とすることが望ましい。The stretching ratios of the parison in the axial direction and the circumferential direction are each 1.5.
It is desirable to set it to 2.5 times (axial direction) and 1.7 to 4.0 times (circumferential direction).
パリソンの成形時に首部外局部の結晶化を行うには、首
部外周部に対応する金型部分を保温し、それ以外の金型
部分を強制冷却する手段が採用される０パリソンの成形
後熱処理するには、パリソンの首部外周部のみを適当な
加熱機構で把持して局部的熱処理を行う。勿論必要あれ
ば首部内周部は強制冷却する。また、パリソンの延伸ブ
ロー成形時に首部外周部を熱処理するには、パリソン首
部外周部を挾持する金型を、前述した温度に維持する０
更に、延伸ブロー成形後のびん首部外周部を加熱処理し
て、外周部の結晶化を行う。In order to crystallize the outer part of the neck during molding of the parison, a method is adopted in which the mold part corresponding to the outer periphery of the neck is kept warm and the other mold parts are forcedly cooled. 0 Heat treatment after molding the parison In this step, only the outer periphery of the neck of the parison is gripped with a suitable heating mechanism to perform local heat treatment. Of course, if necessary, the inner periphery of the neck is forcibly cooled. In addition, in order to heat-treat the outer periphery of the neck during stretch blow molding of the parison, the mold that clamps the outer periphery of the neck of the parison is maintained at the above-mentioned temperature.
Furthermore, the outer periphery of the bottle neck after stretch blow molding is heat-treated to crystallize the outer periphery.
本発明のプラスチックびんは、ジュース、ミネラルウォ
ーター、ソース、ケチャツプ、各種たれ、乳酸菌飲料等
を熱間充填し、長期にわたって保存する用途に特に有用
である０
実施例
密度１．３４固有粘度０．７°５のポリエチレンテレフ
タレートを射出成形して高さ１６２１ＩＩｌ、胴径２６
ｗｍ、胴平均肉厚４ｍ、首部肉厚１■のプリフォームを
成形し、このプリフォームを熱処理しないものＡ１プリ
フォームの首部のみを１８０Ｃに加熱されたネック屋に
て１０秒、６０秒、１分保持した後冷却してＢ ＋ Ｃ
ｔ Ｄのプリフォームを得た０
又、同一型形のプリフォーム型を用いて射出成形過１ｉ
Ｋ於いて首部のみを１８００に加熱し結晶化させたもの
Ｅを得た。The plastic bottle of the present invention is particularly useful for applications in which juices, mineral water, sauces, ketchup, various sauces, lactic acid bacteria drinks, etc. are hot-filled and stored for a long period of time. Example density: 1.34 Intrinsic viscosity: 0.7 Injection molded from °5 polyethylene terephthalate, height 1621 IIl, body diameter 26
wm, a preform with an average body wall thickness of 4 m and a neck wall thickness of 1 cm is molded, and this preform is not heat treated.Only the neck of the A1 preform is heated in a neck shop heated to 180C for 10 seconds, 60 seconds, 1 After holding for a minute, cool down to B + C.
A preform of tD was obtained.0 Also, injection molding was performed using the same preform mold.1i
In K, only the neck was heated to 1,800 ℃ to obtain crystallized product E.
これらＡＢＣＤＨのプリフォームを適性延伸温変に加熱
した後延伸ブロー成形して内容積１０００任のボトルＡ
、Ｂ、Ｃ，Ｄ、Ｅを得た。このボトルＡＢＣＤＨのネッ
ク部表面の密度はそれぞれ１．３４ 、１．３５ 、１
．３７ 、１．３９ 、１．４０でありかつボトルＡＢ
のネック部は透明であシボトルＣＤのネック部の外面は
熱結晶化し内面は熱結晶化しなかったが、ボトルＥのネ
ック部は内外面とも熱結晶化した。These ABCDH preforms are heated to a suitable stretching temperature and then stretch blow molded to form a bottle A with an internal volume of 1000.
, B, C, D, and E were obtained. The densities of the neck surface of this bottle ABCDH are 1.34, 1.35, and 1, respectively.
．． 37, 1.39, 1.40 and bottle AB
The neck of Bottle CD was transparent, and the outer surface of the neck of Bottle CD was thermally crystallized, but the inner surface was not thermally crystallized, but the neck of Bottle E was thermally crystallized on both the inner and outer surfaces.
Ａ、Ｂ、Ｃ，Ｄ、Ｈのボトルにて耐熱性、耐衝撃性の評
価を行った処次の様な結果を得た０υ 耐熱性
各ボトルに８５ｒの熱湯を首部まで充填し、３０分間放
置した後、ボトルのネジ部の径方向の収縮を測定した。We evaluated the heat resistance and impact resistance of bottles A, B, C, D, and H, and obtained the following results. 0υ Heat Resistance Fill each bottle up to the neck with 85R boiling water and heat for 30 minutes. After standing, the radial shrinkage of the threaded portion of the bottle was measured.
表 １
表１の如（ｃ、Ｄ、Ｈのボトルは良好な耐熱性を示した
。Table 1 As shown in Table 1, bottles c, D, and H showed good heat resistance.
２）耐衝撃性
ボトルに１ｔの水を充填しメタルキャップを施した後、
５Ｃに１昼夜保存したものについて落下試験を行った。2) After filling a shock-resistant bottle with 1 ton of water and applying a metal cap,
A drop test was conducted on the samples stored at 5C for one day and night.
落下条件 落下高さ １．８ｒｒＬ 落下方向 倒立 温 度 ５Ｃ 結果 Ｅの様に全面結晶化したものは脆く破損を生じた。Falling conditions: Falling height: 1.8rrL Falling direction: upside down Temperature 5C result The one shown in E, which was completely crystallized, was brittle and broke.
第１図は本発明のプラスチックびんの全体の構造を示す
一部断面正面図、
第２図は第１図のびんの首部の拡大断面図である０
側照数字１は胴部、２は底部、６は肩部、４は首部、６
はネジ部、７は段差部、９は高結晶イし外表面部、１０
は低結晶化内表面部である。Fig. 1 is a partially sectional front view showing the overall structure of the plastic bottle of the present invention, and Fig. 2 is an enlarged sectional view of the neck of the bottle shown in Fig. 1. , 6 is the shoulder, 4 is the neck, 6
is the threaded part, 7 is the step part, 9 is the high crystalline outer surface part, 10 is
is the low crystallization inner surface area.
Claims (1)
ルのパリソンの２軸延伸ブロー成形により形成され九底
部、胴部、肩部及び首部を備えたプラスチックびんにお
いて、前記音部は密度が’Ｌ５６ｔ／ｃｒ、以上となる
高結晶化外表面層と密度が１．３５ｔ／ｃｒ、以下とな
る低結晶化内表面層とを備えていることを特徴とする２
軸嶌伸プラスチツクびん。(1) In a plastic bottle formed by biaxial stretch blow molding of a polyester parison mainly composed of ethylene terephthalate and having nine bottoms, a body, shoulders and a neck, the sound part has a density of 'L56t/cr or more. 2 characterized by comprising a highly crystallized outer surface layer having a density of 1.35 t/cr or less and a low crystallized inner surface layer having a density of 1.35 t/cr or less.
Shin Chikushima plastic bottle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56190779A JPS5892536A (en) | 1981-11-30 | 1981-11-30 | Biaxially stretched plastic bottle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56190779A JPS5892536A (en) | 1981-11-30 | 1981-11-30 | Biaxially stretched plastic bottle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5892536A true JPS5892536A (en) | 1983-06-01 |
Family
ID=16263586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56190779A Pending JPS5892536A (en) | 1981-11-30 | 1981-11-30 | Biaxially stretched plastic bottle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5892536A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186110A (en) * | 1985-02-14 | 1986-08-19 | Kobe Steel Ltd | Aluminum and aluminum alloy sheet for deep drawing |
| JPS61146207U (en) * | 1985-03-01 | 1986-09-09 | ||
| US4933135A (en) * | 1987-11-27 | 1990-06-12 | Krupp Corpoplast Maschinebaur GmbH | Method of making a blow-moulded container from a thermoplastic polyester, in particular pet |
| JPH0615643A (en) * | 1992-07-01 | 1994-01-25 | Dainippon Printing Co Ltd | Manufacture of premolded body |
| EP0655320A1 (en) * | 1993-11-17 | 1995-05-31 | Leopoldo Michelotti | Shaped sheet article of polyethylene terephthalate and method for producing it |
| JPH08244745A (en) * | 1995-03-03 | 1996-09-24 | Dainippon Printing Co Ltd | Container with cap |
| JP2000142662A (en) * | 1998-10-30 | 2000-05-23 | Hanshin Kasei Kogyo Kk | Multi layer thin wall container |
| WO2001083193A1 (en) * | 2000-04-28 | 2001-11-08 | Advanced Plastics Technologies, Ltd. | Bottles and preforms having a crystalline neck |
| WO2002002295A1 (en) * | 2000-06-30 | 2002-01-10 | Schmalbach-Lubeca Ag | Method for producing plastic containers having high crystallinity bases |
| WO2002020246A1 (en) * | 2000-09-05 | 2002-03-14 | Advanced Plastics Technologies, Ltd. | Multilayer containers and preforms having barrier properties utilizing recycled material |
| WO2004012925A1 (en) * | 2002-07-31 | 2004-02-12 | Frontier Inc. | Plastic cup-like container with heat resistance and primary-formed product of the container |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5551525A (en) * | 1978-10-09 | 1980-04-15 | Yoshino Kogyosho Co Ltd | Strengthening mouthpiece of polyethylene- terephtalateresin-made biaxial streching molded bottle |
-
1981
- 1981-11-30 JP JP56190779A patent/JPS5892536A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5551525A (en) * | 1978-10-09 | 1980-04-15 | Yoshino Kogyosho Co Ltd | Strengthening mouthpiece of polyethylene- terephtalateresin-made biaxial streching molded bottle |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61186110A (en) * | 1985-02-14 | 1986-08-19 | Kobe Steel Ltd | Aluminum and aluminum alloy sheet for deep drawing |
| JPS61146207U (en) * | 1985-03-01 | 1986-09-09 | ||
| US4933135A (en) * | 1987-11-27 | 1990-06-12 | Krupp Corpoplast Maschinebaur GmbH | Method of making a blow-moulded container from a thermoplastic polyester, in particular pet |
| JPH0615643A (en) * | 1992-07-01 | 1994-01-25 | Dainippon Printing Co Ltd | Manufacture of premolded body |
| US5902666A (en) * | 1993-11-17 | 1999-05-11 | Michelotti; Leopoldo | Corrugated sheet having a crystallinity gradient |
| EP0655320A1 (en) * | 1993-11-17 | 1995-05-31 | Leopoldo Michelotti | Shaped sheet article of polyethylene terephthalate and method for producing it |
| JPH08244745A (en) * | 1995-03-03 | 1996-09-24 | Dainippon Printing Co Ltd | Container with cap |
| JP2000142662A (en) * | 1998-10-30 | 2000-05-23 | Hanshin Kasei Kogyo Kk | Multi layer thin wall container |
| WO2001083193A1 (en) * | 2000-04-28 | 2001-11-08 | Advanced Plastics Technologies, Ltd. | Bottles and preforms having a crystalline neck |
| WO2002002295A1 (en) * | 2000-06-30 | 2002-01-10 | Schmalbach-Lubeca Ag | Method for producing plastic containers having high crystallinity bases |
| WO2002020246A1 (en) * | 2000-09-05 | 2002-03-14 | Advanced Plastics Technologies, Ltd. | Multilayer containers and preforms having barrier properties utilizing recycled material |
| WO2004012925A1 (en) * | 2002-07-31 | 2004-02-12 | Frontier Inc. | Plastic cup-like container with heat resistance and primary-formed product of the container |
| JP2004058602A (en) * | 2002-07-31 | 2004-02-26 | Frontier:Kk | Cup-like container made of heat-resistant plastic and its primary molded article |
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