JP3797156B2 - Preforms for blow molding of bottle-shaped containers - Google Patents

Preforms for blow molding of bottle-shaped containers Download PDF

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Publication number
JP3797156B2
JP3797156B2 JP2001250206A JP2001250206A JP3797156B2 JP 3797156 B2 JP3797156 B2 JP 3797156B2 JP 2001250206 A JP2001250206 A JP 2001250206A JP 2001250206 A JP2001250206 A JP 2001250206A JP 3797156 B2 JP3797156 B2 JP 3797156B2
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Japan
Prior art keywords
bottle
shaped container
preform
thickness
thick
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JP2003053823A (en
Inventor
温 小宮
仁 藤岡
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Toyo Seikan Kaisha Ltd
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Toyo Seikan Kaisha Ltd
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    • 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
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0723—Preforms or parisons characterised by their configuration having variable wall thickness at flange portion
    • 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
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0724—Preforms or parisons characterised by their configuration having variable wall thickness at body portion
    • 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
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • 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
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0732—Preforms or parisons characterised by their configuration having variable diameter at flange portion
    • 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
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter at body portion
    • 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
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772—Closure retaining means
    • B29C2949/0773—Threads
    • 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
    • B29C2949/076—Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0777—Tamper-evident band retaining ring
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0811—Wall thickness
    • B29C2949/0818—Wall thickness of the bottom
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0829—Height, length
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0839—Angle
    • B29C2949/0845—Angle of the body
    • 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
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0839—Angle
    • B29C2949/0846—Angle of the bottom
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • 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
    • B29C2949/20—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28—Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3024—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected

Description

【０００１】
【発明の属する技術分野】
この発明は、ボトル状容器のブロー成形用プリフォームに関し、特にポリエチレンテレフタレート（ＰＥＴ）のプリフォームをブロー成形してボトル状容器とする場合に、樹脂の使用量の削減と軽量化を図ることができるようにしたものである。
【０００２】
【従来の技術】
従来からポリエチレンテレフタレートなどのポリエステル樹脂等を用いて有底のプリフォームを射出成形し、得られたプリフォームを加熱昇温後、二軸延伸ブロー成形を行ってボトル状容器を製造することが行われており、得られたボトル状容器は、透明性、表面光沢、耐衝撃性、ガスバリア性等に優れ、各種飲料、食品、液体洗剤などの容器として広く使用されている。
【０００３】
このような飲料用のボトル状容器のブロー成形では、最も一般的なプリフォームとして口部を除いて全体がほぼ均一な肉厚に形成したものが用いられ、このプリフォームを２軸延伸ブロー成形すると、ボトル状容器の下部ほど偏肉や局部的な薄肉化を生じ易く、ボトル状容器の接地部から胴下部が薄肉となって剛性や強度が不足することになる。
【０００４】
そこで、このようなボトル状容器の下部の偏肉や局部的な薄肉化を防止するため、例えば特開平４−３６６６０４号公報に開示された発明では、図４に示すように、プリフォーム１のボトル状容器の底部相当部２と胴部相当部３との間の内周面全周に段差４をもってボトル状容器の底部相当部２側を厚くするようにしておき、これをブロー成形することでボトル状容器の底部相当部２に局部的な薄肉化が生じないようにし、これによって偏肉も防止するようにしている。
【０００５】
【発明が解決しようとする課題】
ところが、このような段差を介して厚肉部を形成したフリフォームを用いてブロー成形したボトル状容器では、局部的な薄肉化を防止できるようになるが、段差付近で延伸倍率が大きく変化するため、このボトル状容器を加熱してヒートセットを施して熱結晶化による耐熱強度等を向上しようとすると、局部的な熱収縮が生じてしまうという問題がある。
【０００６】
特に、飲料用のペットボトルなどのボトル状容器では、リサイクル法の施行にともない使用樹脂量の削減や軽量化の要求が高まっており、ボトル状容器の一層の薄肉化を図ろうとすると、ボトル状容器の胴部の延伸倍率を高める必要があり、全体を均一に延伸することが難しく、ヒートセットによる問題解消が一層困難になるという問題がある。
【０００７】
この発明は上記従来技術の有する課題に鑑みてなされたもので、樹脂の使用量の削減と軽量化を図ることができ、しかもヒートセットなどに伴う局所的な熱収縮等を生じることが無く、ボトル状容器として必要な剛性や強度を確保することができるボトル状容器のブロー成形用プリフォームを提供しようとするものである。
【０００８】
【課題を解決するための手段】
上記課題を解決するためブロー成形に用いるプリフォームの形状とブロー成形後のボトル状容器との関係について種々検討を重ねた結果、プリフォームに段差のような急激な肉厚の変化があると、その部分が変曲点となってヒートセットにより局所的な熱収縮が生じる等の問題が生じる一方、プリフォームの形状によって変曲点や中途半端な延伸部分が生じない均一な延伸ができ、しかもボトル状容器として必要な剛性や強度を確保できることを見出だし、この発明を完成したもので、その具体的な構成は以下の通りである。
【０００９】
すなわち、この発明の請求項１記載のボトル状容器のブロー成形用プリフォームは、ボトル状容器のブロー成形に用いる有底の管状プリフォームであって、前記ボトル状容器の接地部から胴下部に対応する前記管状プリフォームの側壁下部を下方に向かい漸次肉厚となる厚肉部に形成するとともに、前記管状プリフォームの底部湾曲部の中心の肉厚を最も薄肉に形成する一方、前記管状プリフォームの前記底部湾曲部の中心の最薄肉部の肉厚Ａを１としたときに、前記下方に向かって漸増する厚肉部Ｂの肉厚比を１．２〜１．８とし、この厚肉部Ｂより上方の一定肉厚の側壁部Ｃの肉厚比を１．０〜１．６とし、かつＢ＞Ｃ≧Ａの関係としてなることを特徴とするものである。
【００１０】
このボトル状容器のブロー成形用プリフォームによれば、軽量化や薄肉化を図りながら均一な延伸を行いつつ、ボトル状容器の接地部から胴下部の部分が薄肉となり、剛性や強度が低下することを防ぎ、これによりボトル状容器として必要な剛性や強度を確保しながらヒートセットによる局部的な熱収縮などが生じないようにしている。
また、ボトル状容器として他の部分に比べて強度を必要としない底凹部の中心を、より薄肉にブロー成形してより一層の軽量化や薄肉化を図ることができるようになる。
さらに、このような肉厚比のプリフォームとすることで、均一な延伸を行って軽量化、薄肉化を図りつつボトル状容器として各部に必要な肉厚と剛性や強度を確保できる。
ここで、下方に向かって漸増する厚肉部Ｂの肉厚比が１．２未満の場合には、ボトル状容器の接地部から胴下部の部分に所望する強度が得られず、１．８を越えた場合には、プリフォーム成形後の冷却に時間を必要以上に要し、生産効率が悪くなる。
また、一定肉厚の側壁部Ｃの肉厚比が１．０未満の場合には、延伸ブローの際に薄肉化したい底部に肉が偏る傾向があり、好ましくなく、１．６を越えた場合には、延伸ブローの際に側壁に肉が偏る傾向があり、厚肉部が所望する厚さの肉厚とならず強度が低下する。
【００１１】
また、この発明の請求項２記載のボトル状容器のブロー成形用プリフォームは、請求項１記載の構成に加え、前記管状プリフォームの側壁下部の前記厚肉部を、当該側壁下部の内表面の鉛直線に対する傾斜を外表面の鉛直線に対する傾斜より大きくして下方に向かって漸増するよう形成してなることを特徴とするものである。
【００１２】
このボトル状容器のブロー成形用プリフォームによれば、外表面にはプリフォームの射出成形時の抜き勾配を備え、しかも段差無く滑らかな厚肉部が形成できるようになる。
【００１３】
さらに、この発明の請求項３記載のボトル状容器のブロー成形用プリフォームは、請求項１または２記載の構成に加え、前記管状プリフォームの側壁下部の前記厚肉部の下部外表面と、前記ボトル状容器の底凹部に対応する当該管状プリフォームの底部湾曲部の上部外表面とを、面取り部を介して肉厚を底部に向かって漸減するように形成してなることを特徴とするものである。
【００１４】
このボトル状容器のブロー成形用プリフォームによれば、ボトル状容器の接地部から胴下部の部分が薄肉となって剛性や強度が低下することを防ぎ、かつボトル状容器として他の部分に比べて強度を必要としない底凹部を薄肉にブロー成形できるようになり、一層の軽量化や薄肉化を図ることができるようになる。
【００２１】
さらに、この発明の請求項４記載のボトル状容器のブロー成形用プリフォームは、請求項１〜３のいずれかに記載の構成に加え、前記管状プリフォームの前記厚肉部の肉厚を上方から下方に漸増する一方、当該厚肉部より上方の前記ボトル状容器の胴上部および胴中間部に対応する側壁部を一定肉厚にし、前記厚肉部より下方の前記底部湾曲部の肉厚を中心が最薄肉部となるよう漸減するよう形成してなることを特徴とするものである。
【００２２】
このボトル状容器のブロー成形用プリフォームによれば、このような肉厚分布のプリフォームとすることで、均一な延伸を行って軽量化、薄肉化を図りつつボトル状容器として各部に必要な肉厚と剛性や強度を確保できる。
【００２３】
これら各発明のボトル状容器のブロー成形用プリフォームによれば、特に２段ブロー成形の際の１次ブロー成形で製品のボトル状容器の１．５倍程度の表面積まで延伸し、これをヒートセットで加熱して熱収縮させたのち、２次ブロー成形で延伸して製品形状のボトル状容器に成形する場合に好適であり、１次ブローによる配向延伸により結晶化度を高め、さらにヒートセットによる熱結晶化により一層の剛性と強度を向上して耐熱性に優れたボトル状容器を得ることができるようになる。
【００２４】
ここで、ボトル状容器の接地部から胴下部の範囲とは、接地部から高さで２０ｍｍ程度の範囲をいう。
【００２５】
【発明の実施の形態】
以下、この発明の実施の形態について図面に基づき詳細に説明する。
図１および図２はこの発明のボトル状容器のブロー成形用プリフォームの一実施の形態にかかり、図１は縦断面図、図２はプリフォームとブロー成形後のボトル状容器の対応部分の説明図である。
【００２６】
このボトル状容器のブロー成形用プリフォーム１０は、例えばポリエチレンテレフタレート（ＰＥＴ）を射出成形することで得られる有底の管状のものであり、このプリフォーム１０を加熱昇温した後、延伸ブロー成形することでボトル状容器３０が成形される。そして、ブロー成形されたボトル状容器３０は、未延伸の口部３１およびサポートリング３２と、延伸された肩部３３、胴部３４、接地部３５および底凹部３６とで構成され、自立可能な形状となっている。
【００２７】
このブロー成形用プリフォーム１０は、ブロー成形後のボトル状容器３０の接地部３５から胴部３４の下部（胴下部）に対応するプリフォーム１０の側壁部１１の下部（胴下部相当部）１１ａが段差なく厚肉とされた厚肉部１２としてある。
【００２８】
この厚肉部１２は、図１に示すように、プリフォーム１０の側壁部１１の外表面と内表面の中心軸と平行な線（鉛直線）に対する傾斜を変えることで底部１３に向かって段差なく厚くすることで形成される。
【００２９】
すなわち、ボトル状容器３０の胴部３４に対応する管状のプリフォーム１０の側壁部１１（胴部相当部）の外表面は、ほぼ全長にわたって鉛直線に対して僅かに傾斜し、射出成形時の抜き勾配を確保して、例えば０．６度の傾斜とされる一方、この厚肉部１２が位置するプリフォーム１０の側壁部１１の下部（胴下部相当部）１１ａの内表面は鉛直線に対して大きな傾斜とされ、例えば２．３度とすることで底部１３に向かって側壁部１１の肉厚が漸増する厚肉部１２となるようにしてある。
【００３０】
このような段差のない厚肉部１２を側壁部１１の下部１１ａに設けたプリフォーム１０を用いてブロー成形することで、ブロー成形されたボトル状容器３０では、接地部３５から胴部３４の下部が厚肉になり、局部的な薄肉化が防止され、必要な強度を確保することができる。
【００３１】
また、２段ブロー成形の場合のように、１次ブロー成形後の半製品を加熱してヒートセットする場合でも、プリフォーム１０に段差がなく均一な延伸がなされるので、局部的な熱収縮を防止して２次ブロー成形することができ、耐熱性に優れたボトル状容器３０を成形することができる。
【００３２】
また、このボトル状容器のブロー成形用プリフォーム１０では、側壁部１１の下部（胴下部相当部）１１ａの厚肉部１２に加え、ボトル状容器３０の底部３５に対応する底部（底部相当部）１３の肉厚が次のように形成してあり、軽量化や樹脂量の削減等を図るようにしている。
【００３３】
すなわち、プリフォーム１０の底部（底部相当部）１３は、側壁部１１の下部１１ａの厚肉部１２の下端から内周面の傾斜が外表面と同一とされて抜き勾配を持つ平行部分１４が形成され、この平行部分１４の下端内周に連続して半球面状の底部内周面１５が形成されてプリフォーム１０が塞がれ、肉厚を定める底部外周面１６は、底部１３の頂部１３ａが最も薄肉とされ、例えば２．５ｍｍとしてあり、頂部１３ａから（上方に）離れるにしたがって僅かずつ肉厚が漸増する底部外周曲面１７とこれに続き平行部分１４の下端外周との間を繋ぐ平面状の傾斜面１８とで構成されており、例えば傾斜面１８の角度が鉛直線に対して２１．６度とされ、この傾斜面１８で底部に向かって肉厚が漸減する面取り部１９が構成されている。
【００３４】
したがって、このようなボトル状容器のブロー成形用プリフォーム１０によれば、その底部１３の肉厚が、底部内周面１５に対して底部１３の中心１３ａが最も薄肉とされ、これから遠ざかるにしたがって僅かずつ厚くなる曲面（底部外周曲面１７）および平面（傾斜面１８）を介して側壁部１１の厚肉部１２の下端の平行部分１４に連続するように構成してあるので、延伸ブロー成形によって延伸されると、平行部分１４によりボトル状容器３０の接地部３５から底凹部３６が成形され、底部１３によって厚肉の接地部３５に比較して薄肉の底凹部３６が成形され、軽量化と樹脂の使用量削減を図ることができ、しかも連続した延伸状態となることから２段ブロー成形の場合のように、１次ブロー成形後の半製品を加熱してヒートセットする場合でも、局部的な熱収縮を防止して２次ブロー成形することができ、耐熱性に優れたボトル状容器３０を成形することができる。
【００３５】
また、このブロー成形用プリフォーム１０の肉厚の最も薄い底部１３の中心１３ａでも２．５ｍｍの肉厚を確保するようにしたので、ブロー成形に伴う樹脂の流動性を良好に保つことができ、これまでと同様の条件でボトル状容器３０をブロー成形することができる。
【００３６】
さらに、このボトル状容器のブロー成形用プリフォーム１０では、ボトル状容器３０の肩部３３に対応する部分である側壁部１１の上部（肩部相当部）２０の肉厚が、サポートリング３２の下端から一定の肉厚の平行部２１と、この平行部２１の肉厚（薄肉）から次第に厚くなるように形成してあり、平行部２１より下方の外表面の鉛直線に対する傾きに比べ、内周面の鉛直線に対する傾きを大きくすることで下方に向かって厚肉に形成され、例えば外表面の傾きを７．９度とし、内表面の傾きを１５．８度とすることで次第に肉厚を厚くするようにしてある。
【００３７】
したがって、このようなボトル状容器のブロー成形用プリフォーム１０によれば、延伸ブロー成形によって大きく延伸されてボトル状容器３０の肩部３３が成形され、軽量化と樹脂の使用量削減を図ることができ、しかも連続した延伸状態となることから２段ブロー成形の場合のように、１次ブロー成形後の半製品を加熱してヒートセットする場合でも、局部的な熱収縮を防止して２次ブロー成形することができ、耐熱性に優れたボトル状容器３０を成形することができる。
【００３８】
以上のようなボトル状容器のブロー成形用プリフォーム１０では、底部１３の最も肉厚の薄い中心部（Ａ）の肉厚を１．０とすると、下方に向かって漸増する厚肉部（Ｂ）１２の肉厚比の範囲を１．２〜１．８、好ましくは１．４〜１．６とし、この厚肉部（Ｂ）１２より上方の一定肉厚の側壁部（Ｃ）１１の肉厚比を１．０〜１．６、好ましくは１．２〜１．４となるようにし、かつ肉厚は、厚肉部Ｂ＞側壁部Ｃ≧中心部Ａの関係であり、これらの条件を満たして段差なく連続するように形成してある。
【００３９】
そして、例えばプリフォーム１０の底部１３の最も肉厚の薄い部分Ａの肉厚を、ブロー成形時の樹脂の流動性を考慮して２．５ｍｍとすれば、具体的な各部は、３．０〜４．５ｍｍ、好ましくは３．５〜４．０ｍｍの範囲で変化する肉厚の厚肉部（Ｂ）１２と、２．５〜４．０ｍｍ、好ましくは３．０〜３．５ｍｍの一定肉厚の側壁部（Ｃ）１１とされ、しかもこの時の肉厚は、厚肉部Ｂ＞側壁部Ｃ≧中心部Ａの関係になる。
【００４０】
なお、プリフォーム１０の厚肉部１２の範囲や側壁部１１の上部や下部の範囲はブロー成形すべきボトル状容器３０の大きさによって異なることからプリフォーム自体の大きさやブロー成形条件、例えば延伸倍率などによって適宜決定することになる。
【００４１】
ここでは、座屈強度が問題となるボトル状容器３０の接地部３５から胴部３４の下部（胴下部）の範囲としては接地部３５から高さで２０ｍｍ程度の範囲をいい、この範囲の肉厚を厚くして強度を確保することで座屈や変形等を防止することができる。
【００４２】
また、プリフォーム１０の具体的な寸法としては、例えばサポートリング３２より下方の長さを８０ｍｍとして５００ｍｌ用のボトル状容器をブロー成形する場合には、上方から順に、平行部２１を２．６８ｍｍ、側壁部１１の上部（胴上部相当部）２０を９．８７ｍｍ、側壁部１１を３７．５ｍｍ、厚肉部（胴下部相当部）１２を１５．６ｍｍ、平行部分１４を４．８２ｍｍ、残りの９．５３ｍｍを底部１３とし、このプリフォーム１０を用いて、１次ブロー成形の後、ヒートセットを行い、さらに２次ブロー成形を行うことで、重量が２６ｇの軽量で耐熱強度の優れたボトル状容器をブロー成形することができた。
【００４３】
さらに、このようなボトル状容器のブロー成形用プリフォーム１０では、全体の肉厚分布を見ると、プリフォーム１０の厚肉部１２の肉厚を上方から下方に漸増してあり、この厚肉部１２より上方のボトル状容器３０の胴部３４の上部（胴上部）および胴部３４の中間部（胴中間部）に対応する側壁部１１が一定肉厚とされ、さらに厚肉部１２より下方の底部１３の肉厚が中心１３ａを最薄肉部として漸増するよう形成してある。
【００４４】
したがって、このような肉厚分布を備えたボトル状容器のブロー成形用プリフォーム１０を用いてブロー成形することで、ボトル状容器３０として各部に必要な肉厚と剛性や強度を確保することができるとともに、均一な延伸を行ってヒートセットなどに伴う熱収縮も防止することができる。
【００４５】
次に、このようなボトル状容器のブロー成形用プリフォームを用いるブロー成形について、図３に示す工程図にしたがって簡単に説明する。
【００４６】
このブロー成形法は、２段ブロー成形を行う場合を示したものであり、まず、１次ブロー成形のため、プリフォーム１０を加熱する。
【００４７】
そして、加熱したプリフォーム１０を１次ブロー成形のための１次金型４１内にセットし、ストレッチロッド４２で縦方向に延伸するとともに、ブローエアを送って横方向にも延伸し、例えば表面積で製品のボトル状容器３０の１．５倍程度の半製品４３を成形する。
【００４８】
この後、１次金型４１から取り出した半製品４３をヒートセットする。
まず、半製品４３全体を囲むパネルヒータ４４で半製品４３の全体を加熱昇温して熱収縮させる。
【００４９】
次に、製品形状に対応した２次金型４５内にヒートセットした半製品４３をセットし、ホットエアを吹き込んで２次ブロー成形を行ってボトル状容器３０を完成する。
【００５０】
このような２段ブロー成形を行うことで、１次ブロー成形による配向延伸によって結晶化度を高めることができ、これをヒートセットによって熱収縮させ、さらにブロー成形することで加熱による熱結晶化が生じ、耐熱性に優れたボトル状容器３０を成形することができる。
【００５１】
そして、この１次ブロー成形に用いるプリフォーム１０が肉厚の急激な変化がなく、ボトル状容器３０として強度の必要な部分を厚肉としてあるので、半製品４３の各部に偏肉が生じたり、中途半端な延伸部分が無くほぼ均一に延伸することができ、ヒートセットによって局部的な熱収縮が生じることもない。
【００５２】
また、延伸されたボトル状容器３０の接地部３５から胴部３４の下部については厚肉にして十分な座屈強度等の強度を確保でき、他の部分を薄肉にできるので、大幅な軽量化を図ることができ、樹脂の使用量も大巾に削減することができる。
【００５３】
また、こうして得られるペットボトル等のボトル状容器３０では、薄肉化を図ることができるので、廃棄する場合に簡単に押し潰すことができ、リサイクルなどのための回収も容易となる。
【００５４】
なお、上記実施の形態では、５００ｍｌの略八角形状のペットボトルを成形する場合のプリフォームを例に説明したが、これに限らず、他の容積の場合ボトル状容器に同様に適用することができる。
【００５５】
また、プリフォームからのブロー成形法も２段ブロー成形法に限らず、２軸延伸ブロー成形によりボトル状容器を成形する場合にも同様に適用できるが、特に２段ブロー成形によれば、ヒートセットによる熱収縮を均一に生じさせることができる。
【００５６】
【発明の効果】
以上、一実施の形態とともに具体的に説明したようにこの発明の請求項１記載のボトル状容器のブロー成形用プリフォームによれば、ボトル状容器のブロー成形に用いる有底の管状プリフォームを、ボトル状容器の接地部から胴下部に対応する前記管状プリフォームの側壁下部を下方に向かい漸次厚肉となる厚肉部に形成したので、軽量化や薄肉化を図りながら均一な延伸を行うことができ、これによりボトル状容器として必要な剛性や強度を確保しながらヒートセットによる局部的な熱収縮などが生じないようにすることができ、耐熱性に優れたボトル状容器を成形することができる。
また、前記管状プリフォームの前記底部湾曲部の中心の肉厚を最も薄肉に形成したので、ボトル状容器として他の部分に比べて強度を必要としない底凹部の中心を、より薄肉にブロー成形してより一層の軽量化や薄肉化を図ることができる。
さらに、前記管状プリフォームの前記底部湾曲部の中心の最薄肉部の肉厚Ａを１としたときに、前記下方に向かって漸増する厚肉部Ｂの肉厚比を１．２〜１．８とし、この厚肉部Ｂより上方の一定肉厚の側壁部Ｃの肉厚比を１．０〜１．６とし、かつＢ＞Ｃ≧Ａの関係としたので、このような肉厚比のプリフォームとすることで、均一な延伸を行って軽量化、薄肉化を図りつつボトル状容器として各部に必要な肉厚と剛性や強度を確保できる。
【００５７】
また、この発明の請求項２記載のボトル状容器のブロー成形用プリフォームによれば、前記管状プリフォームの側壁下部の前記厚肉部を、当該側壁下部の内表面の鉛直線に対する傾斜を外表面の鉛直線に対する傾斜より大きくして下方に向かって漸増するよう形成したので、外表面にはプリフォームの射出成形時の抜き勾配を備え、しかも段差無く滑らかな厚肉部を形成することができ、必要な剛性や強度を確保しながら軽量化や薄肉化を図った耐熱性に優れたボトル状容器を成形することができる。
【００５８】
さらに、この発明の請求項３記載のボトル状容器のブロー成形用プリフォームによれば、前記管状プリフォームの側壁下部の前記厚肉部の下部外表面と、前記ボトル状容器の底凹部に対応する当該管状プリフォームの底部湾曲部の上部外表面とを、面取り部を介して肉厚を底部に向かって漸減するように形成したので、ボトル状容器の接地部から胴下部の部分が薄肉になって剛性や強度が低下することを防ぎ、かつボトル状容器として他の部分に比べて強度を必要としない底凹部を薄肉にブロー成形でき、一層の軽量化や薄肉化を図ることができる。
【００６１】
さらに、この発明の請求項４記載のボトル状容器のブロー成形用プリフォームによれば、前記管状プリフォームの前記厚肉部の肉厚を上方から下方に漸増する一方、当該厚肉部より上方の前記ボトル状容器の胴上部および胴中間部に対応する側壁部を一定肉厚にし、前記厚肉部より下方の前記底部湾曲部の肉厚を中心が最薄肉部となるよう漸減するよう形成したので、このような肉厚分布のプリフォームとすることで、均一な延伸を行って軽量化、薄肉化を図りつつボトル状容器として各部に必要な肉厚と剛性や強度を確保できる。
【００６２】
そして、これら各発明のボトル状容器のブロー成形用プリフォームによれば、特に２段ブロー成形の際の１次ブロー成形で製品のボトル状容器の１．５倍程度の表面積まで延伸し、これをヒートセットで加熱して熱収縮させたのち、２次ブロー成形で延伸して製品形状のボトル状容器に成形する場合に好適であり、１次ブローによる配向延伸により結晶化度を高め、さらにヒートセットによる熱結晶化により一層の剛性と強度を向上して耐熱性に優れたボトル状容器を得ることができる。
【図面の簡単な説明】
【図１】この発明のボトル状容器のブロー成形用プリフォームの一実施の形態にかかる縦断面図である。
【図２】この発明のボトル状容器のブロー成形用プリフォームの一実施の形態にかかるプリフォームとブロー成形後のボトル状容器の対応部分を模式化して示す説明図である。
【図３】この発明のボトル状容器のブロー成形用プリフォームを用いて２段延伸ブロー成形する場合の工程の説明図である。
【図４】従来のボトル状容器のブロー成形のためのプリフォームの縦断面図である。
【符号の説明】
１０ ボトル状容器のブロー成形用プリフォーム
１１ 側壁部
１１ａ 下部（胴下部相当部）
１２ 厚肉部
１３ 底部
１３ａ 頂部
１４ 平行部分
１５ 底部内周面
１６ 底部外周面
１７ 底部外周曲面
１８ 傾斜面
１９ 面取り部
２０ 側壁部の上部（肩部相当部）
２１ 平行部
３０ ボトル状容器
３１ 口部
３２ サポートリング
３３ 肩部
３４ 胴部
３５ 接地部
３６ 底凹部
４１ １次金型
４２ ストレッチロッド
４３ 半製品（１次ブロー成形後）
４４ パネルヒータ
４５ ２次金型[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a preform for blow molding of a bottle-shaped container, and in particular, when a polyethylene terephthalate (PET) preform is blow-molded into a bottle-shaped container, the amount of resin used can be reduced and the weight can be reduced. It is something that can be done.
[0002]
[Prior art]
Conventionally, a bottomed preform is injection-molded using a polyester resin such as polyethylene terephthalate, and the resulting preform is heated and heated, and then biaxially stretched blow-molded to produce a bottle-shaped container. The obtained bottle-like containers are excellent in transparency, surface gloss, impact resistance, gas barrier properties and the like, and are widely used as containers for various beverages, foods, liquid detergents and the like.
[0003]
In the blow molding of such a bottle-like container for beverages, the most common preform is formed with a substantially uniform thickness except for the mouth, and this preform is formed by biaxial stretching blow molding. Then, uneven thickness and local thinning are more likely to occur at the lower part of the bottle-shaped container, and the trunk lower part becomes thinner from the ground contact part of the bottle-shaped container, resulting in insufficient rigidity and strength.
[0004]
Therefore, in order to prevent such uneven thickness and local thinning of the lower portion of the bottle-shaped container, for example, in the invention disclosed in Japanese Patent Laid-Open No. 4-366604, as shown in FIG. Making the bottom equivalent part 2 side of the bottle-shaped container thicker with a step 4 on the entire inner peripheral surface between the bottom equivalent part 2 and the barrel equivalent part 3 of the bottle-shaped container, and blow molding this Therefore, local thinning does not occur in the bottom equivalent portion 2 of the bottle-shaped container, thereby preventing uneven thickness.
[0005]
[Problems to be solved by the invention]
However, in a bottle-shaped container blow-molded using a foam having a thick part formed through such a step, local thinning can be prevented, but the stretch ratio changes greatly in the vicinity of the step. Therefore, when this bottle-shaped container is heated and subjected to heat setting to improve the heat-resistant strength due to thermal crystallization, there is a problem that local heat shrinkage occurs.
[0006]
In particular, in bottle-shaped containers such as plastic bottles for beverages, there is an increasing demand for reducing the amount of resin used and weight reduction with the enforcement of the Recycling Law. It is necessary to increase the draw ratio of the body of the container, and it is difficult to draw the whole uniformly, and there is a problem that it becomes more difficult to solve the problem by heat setting.
[0007]
This invention has been made in view of the above-described problems of the prior art, can reduce the amount of resin used and reduce the weight, without causing local heat shrinkage associated with heat set, etc. An object of the present invention is to provide a preform for blow molding of a bottle-shaped container that can ensure the rigidity and strength necessary for the bottle-shaped container.
[0008]
[Means for Solving the Problems]
As a result of various investigations on the relationship between the shape of the preform used for blow molding and the bottle-shaped container after blow molding in order to solve the above problems, the preform has a sudden change in thickness such as a step, While the part becomes an inflection point and local heat shrinkage occurs due to heat setting, the preform shape allows uniform stretching without inflection points and halfway stretched parts. The present inventors have found that the rigidity and strength necessary for a bottle-like container can be secured, and have completed the present invention. The specific configuration thereof is as follows.
[0009]
That is, the preform for blow-molding a bottle-shaped container according to claim 1 of the present invention is a bottomed tubular preform used for blow-molding a bottle-shaped container, and is formed from the grounding portion of the bottle-shaped container to the lower part of the trunk. The lower part of the side wall of the corresponding tubular preform is formed into a thick part gradually becoming downward and the thickness of the center of the bottom curved part of the tubular preform is formed to be the thinnest, while the tubular preform is formed. When the thickness A of the thinnest wall portion at the center of the bottom curved portion of the reform is 1, the thickness ratio of the thick wall portion B that gradually increases downward is 1.2 to 1.8. The wall thickness ratio of the side wall C having a constant thickness above the wall B is 1.0 to 1.6, and the relationship B> C ≧ A is satisfied.
[0010]
According to this preform for blow-molding a bottle-shaped container, the portion from the grounding part of the bottle-shaped container to the lower part of the body becomes thin while reducing the rigidity and strength while performing uniform stretching while reducing weight and thickness. This prevents the occurrence of local heat shrinkage or the like due to heat setting while ensuring the rigidity and strength necessary for a bottle-shaped container.
In addition, the center of the bottom concave portion that does not require strength as compared with other portions as a bottle-like container can be blow-molded to be thinner to achieve further weight reduction and thickness reduction.
Furthermore, by using a preform having such a thickness ratio, the thickness, rigidity, and strength required for each part can be secured as a bottle-shaped container while performing uniform stretching to reduce weight and thickness.
Here, when the thickness ratio of the thick portion B gradually increasing downward is less than 1.2, a desired strength cannot be obtained from the ground contact portion of the bottle-shaped container to the lower portion of the barrel, and 1.8 In the case of exceeding the above, it takes more time than necessary to cool the preform after molding, and the production efficiency deteriorates.
In addition, when the thickness ratio of the side wall portion C having a constant thickness is less than 1.0, the thickness tends to be biased toward the bottom portion to be thinned at the time of stretch blow, which is not preferable. However, there is a tendency that the thickness of the side wall is biased at the time of stretching blow, and the thickness of the thick portion is not the desired thickness and the strength is reduced.
[0011]
Moreover, the preform for blow molding of a bottle-shaped container according to claim 2 of the present invention is the same as that of claim 1, wherein the thick wall portion at the lower portion of the side wall of the tubular preform is defined as the inner surface of the lower portion of the side wall. The inclination with respect to the vertical line is made larger than the inclination with respect to the vertical line of the outer surface so as to gradually increase downward.
[0012]
According to the preform for blow molding a bottle-shaped container, the outer surface is provided with a draft at the time of injection molding of the preform, and a smooth thick part can be formed without a step.
[0013]
Furthermore, the preform for blow molding of the bottle-shaped container according to claim 3 of the present invention, in addition to the configuration according to claim 1 or 2, further includes a lower outer surface of the thick portion at a lower portion of the side wall of the tubular preform, The upper outer surface of the bottom curved portion of the tubular preform corresponding to the bottom recess of the bottle-shaped container is formed so as to gradually reduce the thickness toward the bottom through the chamfered portion. Is.
[0014]
According to this preform for blow molding of a bottle-shaped container, the portion from the grounding part of the bottle-shaped container to the lower part of the body is thinned to prevent the rigidity and strength from being reduced, and compared to other parts as a bottle-shaped container. Thus, the bottom recess that does not require strength can be blow-molded thinly, and further lightening and thinning can be achieved.
[0021]
Furthermore, the preform for blow-molding a bottle-shaped container according to claim 4 of the present invention has a structure in which the thickness of the thick part of the tubular preform is increased in addition to the structure according to any one of claims 1 to 3. While gradually increasing downward from the thick-walled portion, the side wall portions corresponding to the upper portion and middle portion of the bottle-shaped container above the thick-walled portion have a constant thickness, and the thickness of the bottom curved portion below the thick-walled portion is increased. Is formed so as to gradually decrease so that the center becomes the thinnest portion.
[0022]
According to the preform for blow molding of this bottle-shaped container, it is necessary for each part as a bottle-shaped container while reducing the thickness and reducing the thickness by performing uniform stretching by making the preform having such a thickness distribution. Thickness, rigidity and strength can be secured.
[0023]
According to the preforms for blow molding of the bottle-shaped containers of each of the inventions, the surface is stretched to about 1.5 times the surface area of the bottle-shaped container of the product by the primary blow molding especially in the two-stage blow molding, and this is heated. Suitable for heat shrinking by heating in a set, then stretching by secondary blow molding to form into a bottle-shaped container of product shape, increasing crystallinity by orientation stretching by primary blowing, and heat setting Thermal crystallization by means of this makes it possible to obtain a bottle-like container having improved heat resistance and further improved rigidity and strength.
[0024]
Here, the range from the grounding part of the bottle-shaped container to the lower part of the body means a range of about 20 mm in height from the grounding part.
[0025]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 2 relate to one embodiment of a preform for blow molding of a bottle-shaped container according to the present invention, FIG. 1 is a longitudinal sectional view, and FIG. 2 is a diagram of a corresponding portion of the bottle-shaped container after the preform and blow molding. It is explanatory drawing.
[0026]
The preform 10 for blow molding of this bottle-shaped container is a bottomed tubular product obtained by, for example, injection molding of polyethylene terephthalate (PET). After heating and heating the preform 10, stretch blow molding By doing so, the bottle-shaped container 30 is shape | molded. The blow-molded bottle-shaped container 30 includes an unstretched mouth portion 31 and a support ring 32, and stretched shoulder portions 33, a trunk portion 34, a grounding portion 35, and a bottom recess portion 36, and can be self-supporting. It has a shape.
[0027]
This blow molding preform 10 includes a lower part (corresponding to the lower part of the body) 11a of the side wall part 11 of the preform 10 corresponding to the lower part (lower part of the body) of the body 34 from the grounding part 35 of the bottle-shaped container 30 after the blow molding. Is a thick portion 12 which is thick without a step.
[0028]
As shown in FIG. 1, the thick portion 12 has a step toward the bottom portion 13 by changing the inclination with respect to a line (vertical line) parallel to the center axis of the outer surface and inner surface of the side wall portion 11 of the preform 10. It is formed by making it thick.
[0029]
That is, the outer surface of the side wall portion 11 (corresponding to the body portion) of the tubular preform 10 corresponding to the body portion 34 of the bottle-shaped container 30 is slightly inclined with respect to the vertical line over almost the entire length. While ensuring a draft angle, for example, an inclination of 0.6 degrees, the inner surface of the lower part (corresponding to the lower part of the body) 11a of the side wall part 11 of the preform 10 where the thick part 12 is located is a vertical line. On the other hand, it is set to be a large inclination, for example 2.3 degrees, so that the thickness of the side wall portion 11 gradually increases toward the bottom portion 13 so as to become a thick portion 12.
[0030]
By blow-molding the thick-walled portion 12 having no level difference with the preform 10 provided on the lower portion 11a of the side wall portion 11, the blow-molded bottle-shaped container 30 has a contact portion 35 to a trunk portion 34. The lower part becomes thicker, local thinning is prevented, and the required strength can be ensured.
[0031]
In addition, even when the semi-finished product after the primary blow molding is heated and heat-set as in the case of the two-stage blow molding, the preform 10 is uniformly stretched without any step, so that the local heat shrinkage The bottle-shaped container 30 excellent in heat resistance can be molded.
[0032]
Moreover, in this preform 10 for blow molding of a bottle-shaped container, in addition to the thick part 12 of the lower part (corresponding to the lower part of the body) 11a of the side wall part 11, a bottom part corresponding to the bottom part 35 of the bottle-shaped container 30 (bottom part equivalent part) ) 13 is formed as follows to reduce the weight, reduce the amount of resin, and the like.
[0033]
That is, the bottom portion (bottom portion equivalent portion) 13 of the preform 10 has a parallel portion 14 having a draft with the inner surface inclined from the lower end of the thick portion 12 of the lower portion 11a of the side wall portion 11 to the same as the outer surface. A semispherical bottom inner peripheral surface 15 is formed continuously with the inner periphery of the lower end of the parallel portion 14 to close the preform 10, and the bottom outer peripheral surface 16 that determines the thickness is the top of the bottom 13. 13a is the thinnest, for example, 2.5 mm, and connects between the bottom outer peripheral curved surface 17 where the thickness gradually increases with increasing distance (upward) from the top 13a and the lower end outer periphery of the parallel portion 14 following this. For example, the angle of the inclined surface 18 is 21.6 degrees with respect to the vertical line, and the chamfered portion 19 in which the wall thickness gradually decreases toward the bottom at the inclined surface 18. It is configured.
[0034]
Therefore, according to the blow molding preform 10 of such a bottle-shaped container, the thickness of the bottom 13 is the thinnest at the center 13a of the bottom 13 with respect to the bottom inner peripheral surface 15, and as the distance from the center 13a increases. Since it is configured to continue to the parallel portion 14 at the lower end of the thick wall portion 12 of the side wall portion 11 through a curved surface (bottom surface 17) and a flat surface (inclined surface 18) that gradually increases, When stretched, the bottom portion 36 is formed from the ground contact portion 35 of the bottle-shaped container 30 by the parallel portion 14, and the bottom bottom recess 36 is formed by the bottom portion 13 in comparison with the thick ground contact portion 35. The amount of resin used can be reduced, and since it is in a continuous stretched state, the semi-finished product after the primary blow molding is heated and heat set as in the case of two-stage blow molding. Even if to prevent local thermal shrinkage can be secondary blow molding, it can be molded bottle-shaped container 30 having excellent heat resistance.
[0035]
Further, since the thickness 13 mm is secured even at the center 13 a of the bottom 13 having the thinnest thickness of the blow molding preform 10, the fluidity of the resin accompanying the blow molding can be kept good. The bottle-shaped container 30 can be blow-molded under the same conditions as before.
[0036]
Further, in this bottle-shaped container blow molding preform 10, the thickness of the upper portion (shoulder-corresponding portion) 20 of the side wall portion 11, which corresponds to the shoulder portion 33 of the bottle-shaped container 30, is It is formed so that the parallel portion 21 having a constant thickness from the lower end and the thickness (thin wall) of the parallel portion 21 are gradually increased, and compared to the inclination of the outer surface below the parallel portion 21 with respect to the vertical line, By increasing the inclination of the peripheral surface with respect to the vertical line, it is formed thicker toward the bottom. For example, the inclination of the outer surface is set to 7.9 degrees, and the inclination of the inner surface is set to 15.8 degrees gradually. Is made thicker.
[0037]
Therefore, according to such a blow molding preform 10 for a bottle-shaped container, the shoulder portion 33 of the bottle-shaped container 30 is molded by being greatly stretched by stretch blow molding, thereby reducing weight and reducing the amount of resin used. In addition, even when the semi-finished product after the primary blow molding is heated and heat set as in the case of the two-stage blow molding, it is possible to prevent local heat shrinkage. Next blow molding can be performed, and the bottle-shaped container 30 excellent in heat resistance can be molded.
[0038]
In the bottle-shaped container blow molding preform 10 as described above, when the thickness of the thinnest central portion (A) of the bottom portion 13 is 1.0, the thick-walled portion (B ) The thickness ratio range of 12 is 1.2 to 1.8, preferably 1.4 to 1.6, and the side wall portion (C) 11 having a constant thickness above the thick portion (B) 12 The wall thickness ratio is set to 1.0 to 1.6, preferably 1.2 to 1.4, and the wall thickness has a relation of thick wall portion B> side wall portion C ≧ center portion A. It is formed so as to satisfy the conditions and to be continuous without a step.
[0039]
For example, if the thickness of the thinnest portion A of the bottom portion 13 of the preform 10 is 2.5 mm in consideration of the fluidity of the resin at the time of blow molding, each specific portion is 3.0 -4.5 mm, preferably 3.5 to 4.0 mm thick part (B) 12 varying in the range, 2.5 to 4.0 mm, preferably 3.0 to 3.5 mm constant The thickness of the side wall portion (C) 11 is set to be thick, and the thickness at this time satisfies the relationship of thick wall portion B> side wall portion C ≧ center portion A.
[0040]
In addition, since the range of the thick part 12 of the preform 10 and the range of the upper part and the lower part of the side wall part 11 vary depending on the size of the bottle-shaped container 30 to be blow molded, the size of the preform itself and the blow molding conditions, for example, stretching It is determined appropriately according to the magnification.
[0041]
Here, the range from the grounding part 35 of the bottle-shaped container 30 where the buckling strength is a problem to the lower part of the body part 34 (lower body part) is a range of about 20 mm in height from the grounding part 35. By increasing the thickness to ensure strength, buckling and deformation can be prevented.
[0042]
Further, as specific dimensions of the preform 10, for example, when a 500 ml bottle-shaped container is blow-molded with a length below the support ring 32 of 80 mm, the parallel portion 21 is 2.68 mm in order from the top. The upper part (corresponding to the upper part of the side wall) 20 of 9.87 mm, the side wall part 11 of 37.5 mm, the thick part (corresponding to the lower part of the part) 12 of 15.6 mm, the parallel part 14 of 4.82 mm, the rest 9.53 mm as the bottom 13, and using this preform 10, heat setting was performed after primary blow molding, and then secondary blow molding was performed, so that the weight was 26 g and the heat resistance was excellent. A bottle-shaped container could be blow molded.
[0043]
Furthermore, in the blow molding preform 10 of such a bottle-shaped container, when the overall thickness distribution is seen, the thickness of the thick portion 12 of the preform 10 is gradually increased from the upper side to the lower side. The side wall portion 11 corresponding to the upper portion (the upper portion of the barrel) of the bottle-shaped container 30 above the portion 12 and the middle portion (the middle portion of the barrel) of the barrel portion 34 has a constant thickness. The thickness of the lower bottom 13 is formed so as to gradually increase with the center 13a as the thinnest part.
[0044]
Therefore, it is possible to ensure the thickness, rigidity and strength necessary for each part as the bottle-shaped container 30 by blow-molding using the preform 10 for blow-molding the bottle-shaped container having such a thickness distribution. In addition, uniform shrinkage can be performed to prevent thermal shrinkage associated with heat setting.
[0045]
Next, blow molding using such a bottle-shaped container blow molding preform will be briefly described with reference to the process diagram shown in FIG.
[0046]
This blow molding method shows a case where two-stage blow molding is performed. First, the preform 10 is heated for primary blow molding.
[0047]
Then, the heated preform 10 is set in a primary mold 41 for primary blow molding, and stretched in the longitudinal direction by a stretch rod 42, and blown air is also stretched in the lateral direction. A semi-finished product 43 that is about 1.5 times as large as the product bottle-shaped container 30 is formed.
[0048]
Thereafter, the semi-finished product 43 taken out from the primary mold 41 is heat set.
First, the entire semi-finished product 43 is heated and heated and contracted by the panel heater 44 surrounding the entire semi-finished product 43.
[0049]
Next, the heat-set semi-finished product 43 is set in the secondary mold 45 corresponding to the product shape, and hot air is blown to perform secondary blow molding to complete the bottle-shaped container 30.
[0050]
By performing such two-stage blow molding, the degree of crystallization can be increased by orientation stretching by primary blow molding, and this is thermally contracted by heat setting, and further heat molding is performed by heating by blow molding. The bottle-shaped container 30 which arises and was excellent in heat resistance can be shape | molded.
[0051]
The preform 10 used for the primary blow molding does not have a sudden change in wall thickness, and the bottle-shaped container 30 has a thick portion where strength is required. Further, there is no halfway stretched portion, and the film can be stretched almost uniformly, and local heat shrinkage does not occur due to heat setting.
[0052]
Also, the lower part of the stretched bottle-shaped container 30 from the grounding part 35 to the body part 34 can be made thick to ensure sufficient buckling strength and other parts, and the other parts can be made thin. The amount of resin used can be greatly reduced.
[0053]
Further, since the bottle-like container 30 such as a plastic bottle obtained in this way can be thinned, it can be easily crushed when discarded and can be easily recovered for recycling.
[0054]
In addition, in the said embodiment, although the preform in the case of shape | molding a 500 ml substantially octagon-shaped PET bottle was demonstrated to the example, not only this but in the case of other volumes, it can apply similarly to a bottle-shaped container. it can.
[0055]
Further, the blow molding method from the preform is not limited to the two-stage blow molding method, but can be similarly applied to the case of forming a bottle-shaped container by biaxial stretch blow molding. Heat shrinkage due to setting can be caused uniformly.
[0056]
【The invention's effect】
As described above in detail with the embodiment, according to the preform for blow molding a bottle-shaped container according to claim 1 of the present invention, the bottomed tubular preform used for blow molding of the bottle-shaped container is used. Since the lower part of the side wall of the tubular preform corresponding to the lower part of the tubular container from the grounding part of the bottle-shaped container is formed in a thicker part gradually becoming thicker, uniform stretching is performed while reducing the weight and thickness. It is possible to prevent local heat shrinkage due to heat setting while securing the rigidity and strength necessary for a bottle-shaped container, and to form a bottle-shaped container with excellent heat resistance. Can do.
In addition, since the thickness of the center of the bottom curved portion of the tubular preform is formed to be the thinnest, the center of the bottom recess that does not require strength as compared with other parts as a bottle-like container is blow-molded to a thinner thickness Thus, further weight reduction and thickness reduction can be achieved.
Further, when the thickness A of the thinnest wall portion at the center of the bottom curved portion of the tubular preform is 1, the thickness ratio of the thick wall portion B that gradually increases downward is 1.2 to 1. 8, the thickness ratio of the side wall portion C having a constant thickness above the thick portion B is set to 1.0 to 1.6, and the relationship of B> C ≧ A is established. By using the preform, it is possible to ensure the thickness, rigidity and strength necessary for each part as a bottle-shaped container while achieving uniform weight reduction and thinning.
[0057]
According to the preform for blow-molding a bottle-shaped container according to claim 2 of the present invention, the thick wall portion at the lower portion of the side wall of the tubular preform is inclined with respect to the vertical line of the inner surface of the lower portion of the side wall. Since the surface is formed so as to be larger than the inclination with respect to the vertical line and gradually increase downward, the outer surface has a draft angle during injection molding of the preform and can form a smooth thick part without a step. In addition, it is possible to mold a bottle-shaped container with excellent heat resistance that is reduced in weight and thickness while ensuring necessary rigidity and strength.
[0058]
Furthermore, according to the preform for blow-molding a bottle-shaped container according to claim 3 of the present invention, it corresponds to the lower outer surface of the thick-walled part at the lower part of the side wall of the tubular preform and the bottom recess of the bottle-shaped container. Since the wall thickness is gradually reduced toward the bottom portion through the chamfered portion, the bottom portion of the tubular preform is thinned from the ground contact portion of the bottle-shaped container. As a result, it is possible to prevent the lowering of rigidity and strength and to blow-mold the bottom concave portion that does not require strength as compared with other portions as a bottle-like container, and to further reduce the weight and thickness.
[0061]
Further, according to the preform for blow molding of a bottle-shaped container according to claim 4 of the present invention, the thickness of the thick part of the tubular preform is gradually increased from the upper side to the lower side, while being higher than the thick part. A side wall portion corresponding to the upper portion and middle portion of the bottle-shaped container is formed to have a constant thickness, and the thickness of the bottom curved portion below the thick portion is gradually reduced so that the center becomes the thinnest portion. Therefore, by using a preform having such a wall thickness distribution, it is possible to ensure the wall thickness, rigidity, and strength necessary for each part as a bottle-shaped container while performing uniform stretching to reduce weight and thickness.
[0062]
According to the preforms for blow molding of the bottle-shaped containers of each of the inventions, the surface is stretched to about 1.5 times the surface area of the bottle-shaped container of the product by the primary blow molding particularly in the two-stage blow molding. It is suitable for the case where it is heat-shrinked and heat-shrinked, and then stretched by secondary blow molding and molded into a product-shaped bottle-like container. By heat crystallization by heat setting, it is possible to improve the rigidity and strength of the bottle and obtain a bottle-like container having excellent heat resistance.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view according to one embodiment of a preform for blow molding a bottle-shaped container of the present invention.
FIG. 2 is an explanatory view schematically showing a corresponding portion of a preform and a bottle-shaped container after blow molding according to an embodiment of the present invention.
FIG. 3 is an explanatory diagram of a process in the case of performing two-stage stretch blow molding using the preform for blow molding of the bottle-shaped container of the present invention.
FIG. 4 is a longitudinal sectional view of a preform for blow molding of a conventional bottle-shaped container.
[Explanation of symbols]
10 Preform for blow molding of bottle-shaped container 11 Side wall part 11a Lower part (corresponding to lower part of trunk)
12 thick part 13 bottom part 13a top part 14 parallel part 15 bottom inner peripheral surface 16 bottom outer peripheral surface 17 bottom outer peripheral curved surface 18 inclined surface 19 chamfered part 20 upper part of side wall part (shoulder equivalent part)
21 Parallel part 30 Bottle-shaped container 31 Mouth part 32 Support ring 33 Shoulder part 34 Body part 35 Grounding part 36 Bottom recessed part 41 Primary mold 42 Stretch rod 43 Semi-finished product (after primary blow molding)
44 Panel heater 45 Secondary mold

Claims (4)

ボトル状容器のブロー成形に用いる有底の管状プリフォームであって、前記ボトル状容器の接地部から胴下部に対応する前記管状プリフォームの側壁下部を下方に向かい漸次肉厚となる厚肉部に形成するとともに、前記管状プリフォームの底部湾曲部の中心の肉厚を最も薄肉に形成する一方、前記管状プリフォームの前記底部湾曲部の中心の最薄肉部の肉厚Ａを１としたときに、前記下方に向かって漸増する厚肉部Ｂの肉厚比を１．２〜１．８とし、この厚肉部Ｂより上方の一定肉厚の側壁部Ｃの肉厚比を１．０〜１．６とし、かつＢ＞Ｃ≧Ａの関係としてなることを特徴とするボトル状容器のブロー成形用プリフォーム。A bottomed tubular preform used for blow molding of a bottle-shaped container, wherein the thick-walled part gradually increases in thickness from the grounded part of the bottle-shaped container toward the lower part of the side wall of the tubular preform corresponding to the lower part of the body. And the thickness of the center of the bottom curved portion of the tubular preform is formed to be the thinnest, while the thickness A of the thinnest portion of the center of the bottom curved portion of the tubular preform is set to 1. Further, the thickness ratio of the thick part B gradually increasing downward is set to 1.2 to 1.8, and the thickness ratio of the side wall part C having a constant thickness above the thick part B is set to 1.0. A preform for blow-molding a bottle-shaped container, characterized by having a relationship of .about.1.6 and B> C.gtoreq.A. 前記管状プリフォームの側壁下部の前記厚肉部を、当該側壁下部の内表面の鉛直線に対する傾斜を外表面の鉛直線に対する傾斜より大きくして下方に向かって漸増するよう形成してなることを特徴とする請求項１記載のボトル状容器のブロー成形用プリフォーム。  The thick wall portion at the lower portion of the side wall of the tubular preform is formed so that the inclination of the inner surface of the lower portion of the side wall with respect to the vertical line is larger than the inclination of the outer surface with respect to the vertical line and gradually increases downward. The preform for blow molding a bottle-shaped container according to claim 1. 前記管状プリフォームの側壁下部の前記厚肉部の下部外表面と、前記ボトル状容器の底凹部に対応する当該管状プリフォームの底部湾曲部の上部外表面とを、面取り部を介して肉厚を底部に向かって漸減するように形成してなることを特徴とする請求項１または２記載のボトル状容器のブロー成形用プリフォーム。  The lower outer surface of the thick wall portion at the lower portion of the side wall of the tubular preform and the upper outer surface of the curved bottom portion of the tubular preform corresponding to the bottom recess of the bottle-shaped container are thickened via a chamfered portion. The preform for blow-molding a bottle-shaped container according to claim 1 or 2, wherein the preform is formed so as to gradually decrease toward the bottom. 前記管状プリフォームの前記厚肉部の肉厚を上方から下方に漸増する一方、当該厚肉部より上方の前記ボトル状容器の胴上部および胴中間部に対応する側壁部を一定肉厚にし、前記厚肉部より下方の前記底部湾曲部の肉厚を中心が最薄肉部となるよう漸減するよう形成してなることを特徴とする請求項１〜３のいずれかに記載のボトル状容器のブロー成形用プリフォーム。  While gradually increasing the thickness of the thick-walled portion of the tubular preform from above to below, the side walls corresponding to the upper portion of the bottle-shaped container and the middle portion of the bottle-shaped container above the thick-walled portion have a constant thickness, The bottle-shaped container according to any one of claims 1 to 3, wherein a thickness of the bottom curved portion below the thick-walled portion is formed so as to gradually decrease so that a center becomes the thinnest-walled portion. Blow molding preform.
JP2001250206A 2001-08-21 2001-08-21 Preforms for blow molding of bottle-shaped containers Expired - Fee Related JP3797156B2 (en)

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JP6266532B2 (en) 2011-12-22 2018-01-24 アムコー リミテッド Method and apparatus for controlling temperature gradient in container wall thickness
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JP2017007264A (en) * 2015-06-25 2017-01-12 大日本印刷株式会社 Preform, plastic bottle, and method for producing plastic bottle
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