JP2010012606A - Method for molding laminated preform - Google Patents

Method for molding laminated preform Download PDF

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Publication number
JP2010012606A
JP2010012606A JP2008171870A JP2008171870A JP2010012606A JP 2010012606 A JP2010012606 A JP 2010012606A JP 2008171870 A JP2008171870 A JP 2008171870A JP 2008171870 A JP2008171870 A JP 2008171870A JP 2010012606 A JP2010012606 A JP 2010012606A
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Prior art keywords
resin
intermediate layer
laminated
flow path
forming
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JP2008171870A
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JP4953179B2 (en
Inventor
Tamotsu Toyoda
保 豊田
Hiroshi Saietsusan
広 細越山
Yasuhiro Ishizawa
安弘 石沢
Hideaki Soyama
秀明 曽山
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Yoshino Kogyosho Co Ltd
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Yoshino Kogyosho Co Ltd
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Priority to JP2008171870A priority Critical patent/JP4953179B2/en
Application filed by Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Priority to AU2009264613A priority patent/AU2009264613B2/en
Priority to PCT/JP2009/061820 priority patent/WO2010001842A1/en
Priority to US13/001,212 priority patent/US8607999B2/en
Priority to CN2009801004219A priority patent/CN101801641B/en
Priority to EP18194845.6A priority patent/EP3459707B1/en
Priority to CA2729527A priority patent/CA2729527C/en
Priority to KR1020107005004A priority patent/KR101277925B1/en
Priority to EP09773420.6A priority patent/EP2311624B1/en
Publication of JP2010012606A publication Critical patent/JP2010012606A/en
Application granted granted Critical
Publication of JP4953179B2 publication Critical patent/JP4953179B2/en
Priority to US14/057,244 priority patent/US9096003B2/en
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Anticipated expiration legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00Making preforms
    • B29B11/14Making preforms characterised by structure or composition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00Making preforms
    • B29B11/06Making preforms by moulding the material
    • B29B11/08Injection moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/0715Preforms or parisons characterised by their configuration the preform having one end closed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/072Preforms or parisons characterised by their configuration having variable wall thickness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/073Preforms or parisons characterised by their configuration having variable diameter
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/076Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772Closure retaining means
    • B29C2949/0773Threads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/076Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0777Tamper-evident band retaining ring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3008Preforms or parisons made of several components at neck portion
    • B29C2949/3009Preforms or parisons made of several components at neck portion partially
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3012Preforms or parisons made of several components at flange portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3016Preforms or parisons made of several components at body portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3016Preforms or parisons made of several components at body portion
    • B29C2949/3018Preforms or parisons made of several components at body portion partially
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/302Preforms or parisons made of several components at bottom portion
    • B29C2949/3022Preforms or parisons made of several components at bottom portion partially
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3024Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • B29C2949/3026Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
    • B29C2949/3028Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3024Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • B29C2949/3026Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
    • B29C2949/3028Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components
    • B29C2949/303Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components having three or more components having more than three components
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3032Preforms or parisons made of several components having components being injected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3032Preforms or parisons made of several components having components being injected
    • B29C2949/3034Preforms or parisons made of several components having components being injected having two or more components being injected
    • B29C2949/3036Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3032Preforms or parisons made of several components having components being injected
    • B29C2949/3034Preforms or parisons made of several components having components being injected having two or more components being injected
    • B29C2949/3036Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected
    • B29C2949/3038Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected having more than three components being injected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06Injection blow-moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2067/00Use of polyesters or derivatives thereof, as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2077/00Use of PA, i.e. polyamides, e.g. polyesteramides or derivatives thereof, as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING 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
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25Solid
    • B29K2105/253Preform
    • B29K2105/258Tubular
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/712Containers; Packaging elements or accessories, Packages
    • B29L2031/7158Bottles

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the problem of delamination in a laminated bottle body by a biaxially stretching blow, and to provide a synthetic-resin laminated bottle body with delamination suppressed effectively and a method for molding a laminated preform used in the molding of such a laminated bottle body. <P>SOLUTION: In multiple nozzle part in which a plurality of molten resins are piled up, a main material resin is supplied to an annular channel forming a substrate layer under a prescribed pressure or at a prescribed speed for a prescribed time and an intermediate layer resin is intermittently supplied to an annular channel forming an intermediate layer for a prescribed time within the above prescribed time range. Thereby, a plurality of circumferential connection strip parts are parallelly formed with the substrate layer connected in the central axis direction. By partitioning the intermediate layer resin in the peripheral direction by a channel forming the intermediate layer, a plurality of longitudinal connection strip parts are parallelly formed in the peripheral direction. The laminated preform is molded having a lamination structure with the intermediate layer vertically/horizontally partitioned by the circumferential connection strip parts and the longitudinal connection strip parts. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、射出成形装置を用いた2軸延伸ブロー成形用の試験管状の積層プリフォームの成形方法、特に中間層を周方向と中心軸方向に分断した積層構造有する積層プリフォームの成形方法に関する。
The present invention relates to a method for forming a test tubular laminated preform for biaxial stretch blow molding using an injection molding apparatus, and more particularly to a method for forming a laminated preform having a laminated structure in which an intermediate layer is divided in a circumferential direction and a central axis direction. .

ポリエチレンテレフタレート(以下、PETと略記する。)樹脂製等の2軸延伸ブロー成形による壜体は、飲料用、食品用、化粧料等のさまざまな分野に使用されている。特にガスバリア性を必要とする用途では、主材樹脂であるPET樹脂に中間層としてナイロン系樹脂やエチレンビニルアルコール共重合樹脂等のガスバリア性樹脂を積層した壜体が用いられている。   2. Description of the Related Art Biaxially stretched blow molded bodies made of polyethylene terephthalate (hereinafter abbreviated as PET) resin are used in various fields such as beverages, foods, and cosmetics. Particularly in applications that require gas barrier properties, a casing is used in which a gas barrier resin such as a nylon resin or an ethylene vinyl alcohol copolymer resin is laminated as an intermediate layer on a PET resin, which is a main material resin.

特許文献1にはこのようなガスバリア性樹脂を積層した2軸延伸ブロー成形による積層壜体、その一次成形品である試験管状の積層プリフォームの成形方法について記載されている。図11、12にこのような壜体とプリフォームの代表例的な例を示す。
図11に示す壜体601は口筒部602、ネックリング603、円筒状の胴部605、そして底部606を有し、口筒部602の上端部と底部606を除く高さ領域ではPET樹脂製の基体層である外層611と内層612の間にガスバリア性樹脂であるナイロン樹脂製の中間層613を積層している。
Patent Document 1 describes a method for forming a laminated casing obtained by biaxial stretch blow molding in which such a gas barrier resin is laminated, and a test tubular laminated preform which is a primary molded product thereof. 11 and 12 show typical examples of such a case and preform.
A housing 601 shown in FIG. 11 has a mouth tube portion 602, a neck ring 603, a cylindrical body portion 605, and a bottom portion 606, and is made of PET resin in a height region excluding the upper end portion and the bottom portion 606 of the mouth tube portion 602. An intermediate layer 613 made of nylon resin, which is a gas barrier resin, is laminated between an outer layer 611 and an inner layer 612 which are base layers.

この壜体601は図12に示すプリフォーム501を2軸延伸ブロー成形して成形することができるが、このプリフォーム501は口筒部502、ネックリング503、円筒状の胴部505、そして底部506を有し、口筒部502と底部506を除く高さ領域ではPET樹脂製の基体層である外層511と内層512の間にガスバリア性樹脂であるナイロン樹脂製の中間層513を積層したものである。
特開平1−254539号公報
The housing 601 can be formed by biaxially stretch-blow-molding the preform 501 shown in FIG. 12. The preform 501 includes a mouth tube portion 502, a neck ring 503, a cylindrical body portion 505, and a bottom portion. In the height region excluding the mouthpiece portion 502 and the bottom portion 506, an intermediate layer 513 made of nylon resin, which is a gas barrier resin, is laminated between an outer layer 511, which is a base layer made of PET resin, and an inner layer 512. It is.
JP-A-1-254539

ここで、上記のように主材樹脂であるPET樹脂層に中間層としてナイロン樹脂等のガスバリア性樹脂を積層した2軸延伸ブロー壜体ではPET樹脂層とガスバリア性樹脂層は密着しているものの、多くの場合接着しているわけではない。このため、たとえば炭酸飲料等の内部が加圧状態となる用途では、使用前内部が加圧状態である際には問題ないが、キャップを外した際、急激な圧力の変化に起因する大きな剪断力の作用により両層が剥離することがある。
このように一旦両層が剥離してしまうと、もう一度密着することはなく、剥離界面で光が散乱あるいは反射して剥離していることが外側からも認められ、外観を損ねてしまうと云う問題が生じる。
また2軸延伸ブロー成形後の収縮過程においても、中間層と外層あるいは内層との収縮量の違いにより、層間剥離が発生すると云う問題もある。
Here, in the biaxially stretched blow housing in which a gas barrier resin such as nylon resin is laminated as an intermediate layer on the PET resin layer as the main material resin as described above, the PET resin layer and the gas barrier resin layer are in close contact with each other. In many cases, it is not glued. For this reason, for example, in applications where the inside of a carbonated beverage or the like is in a pressurized state, there is no problem when the inside before use is in a pressurized state, but when the cap is removed, a large shear is caused by a sudden change in pressure. Both layers may peel due to the action of force.
In this way, once both layers are peeled off, they do not come into close contact with each other, but light is scattered or reflected at the peeling interface, which is recognized from the outside, and the appearance is impaired. Occurs.
In the shrinking process after biaxial stretch blow molding, there is also a problem that delamination occurs due to the difference in shrinkage between the intermediate layer and the outer layer or the inner layer.

本発明は、2軸延伸ブローによる積層壜体における上記のような層間剥離の問題を抑制することを課題とするものであり、層間剥離が効果的に抑制された合成樹脂製積層壜体、さらにはこのような積層壜体の成形に用いられる積層プリフォームの成形方法を提供することを目的とする。
An object of the present invention is to suppress the problem of delamination as described above in a laminated case by biaxial stretching blow, and a synthetic resin-made laminated case in which delamination is effectively suppressed, An object of the present invention is to provide a method for forming a laminated preform used for forming such a laminated casing.

上記技術的課題を解決する本発明の、積層プリフォームに係る主たる成形方法は次のようなものである。
射出成形装置を用いた2軸延伸ブロー成形用の試験管状の積層プリフォームの成形方法であって、
成形するプリフォームは、基体層、及び所定の高さ領域で前記基体層の間に中間層を有すると共に、前記所定の高さ領域で、周状及び中心軸方向に複数、並列状に基体層が連結した周帯状連結部と縦帯状連結部を有し、中間層がこれら周帯状連結部と縦帯状連結部により周方向と中心軸方向に分断した積層構造有をするものであり、
基体層を形成する主材樹脂と中間層を形成する中間層樹脂を積層する多重ノズル部を有する射出成形装置を用い、
前記ノズル部において、所定時間、所定の圧力若しくは速度で主材樹脂を基体層を形成する円環状の流路に供給し、
また、前記所定時間範囲内の一定時間、同時に他の供給部から断続的に中間層樹脂を、中間層を形成する円環状の流路に供給すると共に、この流路内で中間層樹脂を周方向に分断し、
この中間層樹脂を、軸方向及び周方向に分断した状態で主材樹脂の間に合流させて積層溶融樹脂流体を形成し、
この積層溶融樹脂流体を金型キャビティに充填する。
The main molding method according to the present invention for solving the above technical problem according to the laminated preform is as follows.
A method of molding a test tubular laminated preform for biaxial stretch blow molding using an injection molding apparatus,
The preform to be molded has a base layer and an intermediate layer between the base layers in a predetermined height region, and a plurality of base layers in the circumferential direction and the central axis direction in the predetermined height region in parallel. Has a laminated structure in which the intermediate layer is divided in the circumferential direction and the central axis direction by the circumferential band-like connecting part and the vertical belt-like connecting part.
Using an injection molding apparatus having a multiple nozzle part for laminating a main material resin forming a base layer and an intermediate layer resin forming an intermediate layer,
In the nozzle portion, the main material resin is supplied to the annular flow path forming the base layer at a predetermined pressure or speed for a predetermined time,
In addition, the intermediate layer resin is intermittently supplied from another supply unit to the annular flow path that forms the intermediate layer for a certain time within the predetermined time range, and the intermediate layer resin is circulated in the flow path. Divided in the direction,
This intermediate layer resin is joined between the main material resins in a state of being divided in the axial direction and the circumferential direction to form a laminated molten resin fluid,
The laminated molten resin fluid is filled into the mold cavity.

上記成形方法よれば、主材樹脂を基体層を形成する流路に供給する所定時間範囲内の一定時間、同時に中間層樹脂を中間層を形成する中流路に供給すると云う方法は、所謂、同時射出法と称されるものであり、中流路への中間層樹脂の供給開始時間と供給停止時間を適宜設定することにより、プリフォームの所定の高さ領域に中間層を積層することができる。   According to the above molding method, the method of supplying the intermediate layer resin to the middle flow path for forming the intermediate layer at the same time for a certain time within the predetermined time range in which the main material resin is supplied to the flow path for forming the base layer is the so-called simultaneous method. This is called an injection method, and the intermediate layer can be laminated in a predetermined height region of the preform by appropriately setting the supply start time and supply stop time of the intermediate layer resin to the middle flow path.

さらに、この一定時間において断続的に中間層を形成する中間層樹脂を中流路に供給することにより、中間層樹脂の供給を停止した時間帯では流動してきた主材樹脂を周状に直接積層させることができ、その結果、射出成形される積層プリフォームには、周状に断続回数に応じた個数、並列状に基体層が連結した周帯状連結部を形成することができる。   Furthermore, by supplying the intermediate layer resin that forms the intermediate layer intermittently to the intermediate flow path during this fixed time, the main material resin that has flowed in the time zone when the supply of the intermediate layer resin is stopped is directly laminated in a circumferential shape. As a result, the laminated preform to be injection-molded can be formed with a peripheral band-like connecting portion in which the base layers are connected in parallel in the number corresponding to the number of intermittent interruptions.

一方、中間層を形成する円環状の流路内で中間層樹脂を周方向に分断し、中間層をこのように周方向に分断した状態で基体層の間に積層させることにより、中間層が分断した部分では基体層が連結し、射出成形される積層プリフォームには、中心軸方向にこの遮断縦リブ片の配設個数に応じた個数、並列状に、基体層が連結した縦帯状連結部を形成することができ、
上記周帯状連結部と合せて、所定の高さ領域で、周状及び中心軸方向に複数、並列状に基体層が連結した周帯状連結部と縦帯状連結部を有し、中間層がこれら周帯状連結部と縦帯状連結部により周方向と中心軸方向に分断した積層構造有する積層プリフォームを成形することが可能となる。
On the other hand, the intermediate layer resin is divided in the circumferential direction in the annular flow path forming the intermediate layer, and the intermediate layer is laminated between the base layers in such a state that the intermediate layer is divided in the circumferential direction. The base layer is connected at the divided portion, and the laminated preform to be injection-molded is connected to the base strip in the form of a number corresponding to the number of the cut vertical rib pieces arranged in the central axis direction. Part can be formed,
Along with the above-described circumferential belt-like coupling portion, there are a circumferential belt-like coupling portion and a vertical belt-like coupling portion in which a plurality of base layers are coupled in parallel and in the circumferential direction and the central axis direction at a predetermined height region, and the intermediate layer has these It becomes possible to mold a laminated preform having a laminated structure divided in the circumferential direction and the central axis direction by the circumferential belt-like connecting portion and the vertical belt-like joining portion.

そして、このような積層プリフォームを2軸延伸ブロー成形することにより、この積層プリフォームの中間層の積層構造に対応して、所定の高さ領域で、周状及び中心軸方向に複数、並列状に基体層が連結した周帯状連結部と縦帯状連結部を有し、中間層が周帯状連結部と縦帯状連結部により周方向と中心軸方向、すなわち縦横に分断した積層構造有する積層壜体を得ることができる。   Then, by biaxially stretching and blowing such a laminated preform, a plurality of parallel preforms in the circumferential direction and the central axis direction are arranged in parallel at a predetermined height region corresponding to the laminated structure of the intermediate layer of the laminated preform. A laminated structure having a laminated structure in which the base layer is connected to the base layer and the vertical belt-like connecting part, and the intermediate layer is divided by the peripheral belt-like connecting part and the vertical belt-like connecting part in the circumferential direction and the central axis direction, that is, vertically and horizontally. You can get a body.

そしてまた、このような積層構造を有する壜体にあっては、主材樹脂製の基体層が連結した周帯状連結部と縦帯状連結部により、中間層を縦横に分断した積層状態とするこができ、基体層と中間層間に作用する剪断力の作用は、左右両端を縦帯状連結部により拘束された状態で作用することになり、その分、成形収縮や、壜体内の圧力変化等に起因する層間剥離の発生を効果的に抑制することができる。   In addition, in a case having such a laminated structure, the intermediate layer is divided into a laminated state vertically and horizontally by a peripheral belt-like connecting portion and a vertical belt-like connecting portion to which a base material resin base layer is connected. The shearing force acting between the base layer and the intermediate layer can act in a state where the left and right ends are constrained by the longitudinal belt-like connecting portion, and accordingly, the molding shrinkage, the pressure change in the housing, etc. It is possible to effectively suppress the occurrence of delamination caused.

なお、上記射出成形装置の構成によれば、多重ノズル内で中間層の両側に基体層を積層すると云う要件を満足する中で、適宜供給部を追加したり、多重ノズルにおいて円環状の流路を追加することにより、基体層と中間層からなる積層プリフォームの積層構造は、さまざまな態様とすることがでる。
たとえば2種3層(基体層/中間層/基体層)、2種5層(基体層/中間層/基体層R/中間層/基体層)、3種4層(基体層/中間層A/中間層B/基体層)、3種4層(基体層/基体層R/中間層/基体層)、3種5層(基体層/中間層A/基体層/中間層B/基体層)、3種5層(基体層/中間層/基体層R/中間層/基体層)等の積層構造とすることができる。
また、中間層が複数形成される場合にも、それぞれの中間層の両側に位置する基体層をノズル内で連結して周帯状連結部や縦帯状連結部を形成することができる。
なお上記説明で中間層Aと中間層Bはこれら中間層が異なる樹脂製であることを示し、基体層Rは主材樹脂のリサイクル品を使用した層であることを示している
In addition, according to the configuration of the injection molding apparatus, while satisfying the requirement that the base layer is laminated on both sides of the intermediate layer in the multiplex nozzle, an appropriate supply unit is added or an annular flow path is provided in the multiplex nozzle. By adding the above, the laminated structure of the laminated preform composed of the base layer and the intermediate layer can take various forms.
For example, two types and three layers (base layer / intermediate layer / base layer), two types and five layers (base layer / intermediate layer / base layer R / intermediate layer / base layer), three types and four layers (base layer / intermediate layer A / (Intermediate layer B / substrate layer), 3 types and 4 layers (substrate layer / substrate layer R / intermediate layer / substrate layer), 3 types and 5 layers (substrate layer / intermediate layer A / substrate layer / intermediate layer B / substrate layer), A laminated structure of three types and five layers (base layer / intermediate layer / base layer R / intermediate layer / base layer) can be employed.
Also, when a plurality of intermediate layers are formed, the base layer located on both sides of each intermediate layer can be connected within the nozzle to form a peripheral belt-like connection portion or a vertical belt-like connection portion.
In the above description, the intermediate layer A and the intermediate layer B indicate that these intermediate layers are made of different resins, and the base layer R indicates that the recycled material of the main material resin is used.

本発明の合成樹脂製積層壜体に係る他の構成は、上記主たる構成に加えて、
使用する射出成形装置を、
少なくとも、主材樹脂と中間層を形成する中間層樹脂を供給する2ケの樹脂供給部と、この主材樹脂と中間層樹脂を積層する多重ノズル部と、プリフォームを形成する金型を有し、
多重ノズル部が、
少なくとも、主材樹脂による基体層を形成する円環状の内流路及び外流路と、これら内流路と外流路の間に位置し中間層樹脂による中間層を形成する円環状の中流路の3ケの層形成流路を有し、
これら少なくとも3ケの層形成流路の下流側に、各層形成流路を流動する溶融樹脂が合流する合流点を介して合流路を配設し、
中間層樹脂が流動する中流路の所定位置から合流点に至る範囲に、周方向に複数、並列状に、中流路を横断する遮断縦リブ片を配設し、この遮断縦リブ片により中流路を周方向に複数の流路に分断する
構成を有するものとし、
このような射出成形装置を用い、
供給部から所定時間、所定の圧力若しくは速度で基体層を形成する主材樹脂を内流路と外流路に供給し、
また、前記所定時間範囲内の一定時間、同時に他の供給部から断続的に中間層を形成する中間層樹脂を中流路に供給し、
この中流路内で中間層樹脂を遮断縦リブ片により周方向に分断し、合流点で前記中間層樹脂を、軸方向及び周方向に分断した状態で内流路と外流路からの主材樹脂の間に流動させて、合流路内で積層溶融樹脂流体を形成し、
この積層溶融樹脂流体を金型キャビティに充填する、
と云うものである。
In addition to the main configuration described above, the other configuration related to the synthetic resin laminated casing of the present invention is as follows.
The injection molding equipment to be used
There are at least two resin supply parts that supply the intermediate resin that forms the intermediate layer with the main resin, a multiple nozzle part that laminates the main resin and the intermediate resin, and a mold that forms the preform. And
Multiple nozzle part
At least three annular inner channels and outer channels that form a base layer made of a main material resin, and an annular middle channel that forms an intermediate layer made of an intermediate layer resin between the inner channel and the outer channel. Having a layer formation flow path,
On the downstream side of these at least three layer formation channels, a merge channel is disposed via a junction where the molten resin flowing in each layer formation channel merges,
In the range from the predetermined position of the middle flow path through which the intermediate layer resin flows to the confluence, a plurality of cut-off longitudinal rib pieces crossing the middle flow path are arranged in parallel in the circumferential direction. Is divided into a plurality of flow paths in the circumferential direction,
Using such an injection molding device,
Supply the main material resin forming the base layer at a predetermined pressure or speed for a predetermined time from the supply unit to the inner flow path and the outer flow path,
In addition, an intermediate layer resin that intermittently forms an intermediate layer from another supply unit at the same time within the predetermined time range is supplied to the middle flow path,
In this middle flow path, the intermediate layer resin is divided in the circumferential direction by the blocking vertical rib pieces, and the intermediate layer resin is divided in the axial direction and the circumferential direction at the junction, and the main resin from the inner flow path and the outer flow path To form a laminated molten resin fluid in the combined flow path,
Filling the mold cavity with this laminated molten resin fluid,
It is said.

上記構成は、射出成形装置の詳細な構造に係るものであり、
特に、使用する射出成形装置のノズル部において、中流路の所定位置から合流点に至る範囲に周方向に並列状に配設した複数の遮断縦リブ片により、この中流路を流動する円環状の中間層樹脂を周方向に分断することができ、そして中間層を周方向に分断した状態で基体層の間に積層させることができ、中間層が分断した部分では基体層が連結し、射出成形される積層プリフォームには、中心軸方向にこの遮断縦リブ片の配設個数に応じた個数、並列状に、基体層が連結した縦帯状連結部を形成することができる。
The above configuration relates to the detailed structure of the injection molding apparatus,
In particular, in the nozzle part of the injection molding apparatus to be used, a plurality of blocking vertical rib pieces arranged in parallel in the circumferential direction in a range from a predetermined position of the middle flow path to the merging point, an annular shape that flows in the middle flow path The intermediate layer resin can be divided in the circumferential direction, and the intermediate layer can be laminated between the base layers in a state where the intermediate layer is divided in the circumferential direction. In the laminated preform to be formed, the number of the blocking vertical rib pieces arranged in the central axis direction can be formed in a number corresponding to the number of the cut vertical rib pieces, and the vertical strip-shaped connecting portions connected to the base layer can be formed in parallel.

本発明の合成樹脂製積層壜体に係るさらに他の構成は、上記主たる構成に加えて、口筒部及び底部を除いた部分を所定の高さ領域とする、と云うものである。   According to still another configuration of the synthetic resin-made laminated casing of the present invention, in addition to the main configuration, a portion excluding the mouth tube portion and the bottom portion is defined as a predetermined height region.

中間層を積層する高さ領域、あるいは縦帯状連結部の、本数あるいは横幅等の形成態様は壜体の使用目的、ガスバリア性等の中間層に基づく機能、さらにはプリフォーム、あるいはこのプリフォームを一次成形品とする壜体の成形性(生産性)を考慮して適宜決めることができ、中間層を積層する高さ領域を壜体の全高さ範囲とすることもできる。
ここで、口筒部は、2軸延伸ブロー成形により延伸されていない部分であり、また底部は十分に延伸されていない部分で、中間層を積層することにより変形が発生し易すいので、上記構成のように口筒部と底部は中間層が積層しない領域とすることにより、口筒部におけるキャップによるシール性、あるいは底部において壜体の起立性が損なわれると云う問題を効果的に防ぐことができる。
The height region where the intermediate layer is laminated, or the number or width of the vertical belt-like connecting portion, the form of use, the function based on the intermediate layer such as the gas barrier property, the preform, or this preform It can be determined appropriately in consideration of the moldability (productivity) of the casing as the primary molded product, and the height region where the intermediate layer is laminated can be set to the entire height range of the casing.
Here, the mouth tube portion is a portion that is not stretched by biaxial stretch blow molding, and the bottom portion is a portion that is not sufficiently stretched, and it is easy for deformation to occur by laminating the intermediate layer. By making the mouth tube part and the bottom part a region where the intermediate layer is not stacked as in the configuration, it is possible to effectively prevent the problem that the sealing performance by the cap in the mouth tube part or the standing property of the casing at the bottom part is impaired. Can do.

本発明のさらに他の成形方法は、上記主たる方法に加えてプリフォームを主材樹脂と中間層を形成するガスバリア性樹脂からなる2種3層の積層構造を有するものとする、と云うものである。   According to still another molding method of the present invention, in addition to the main method described above, the preform has a laminated structure of two types and three layers comprising a main material resin and a gas barrier resin forming an intermediate layer. is there.

上記構成は、中間層をガスバリア性樹脂製として壜体のガスバリア性を向上させるための構成であり、代表的には、たとえばPET/MXD−6等のナイロン系樹脂/PET、PET/EVOH/PET、PP/EVOH/PPガスバリア性樹脂、PLA/PGA/PLA等の層構成がある。
(上記層構成の記載でEVOHはエチレンビニルアルコール共重合体、PPはポリプロピレン樹脂、PLAはポリ乳酸、PGAはポリグリコール酸を表す。)
The above configuration is a configuration for improving the gas barrier property of the housing by making the intermediate layer made of a gas barrier resin. Typically, for example, nylon resin / PET such as PET / MXD-6, PET / EVOH / PET , PP / EVOH / PP gas barrier resin, PLA / PGA / PLA and the like.
(In the description of the layer structure, EVOH represents an ethylene vinyl alcohol copolymer, PP represents a polypropylene resin, PLA represents polylactic acid, and PGA represents polyglycolic acid.)

また、ガスバリア性樹脂製の中間層のバリア性をさらに向上するために、ガスバリア性樹脂に酸素スカベンジャー、酸素吸収剤を混合分散したり、MXD−6ナイロン樹脂に層状ケイ酸塩を分散してナノコンポジット系材料とすることもできる。
また、水分に対するバリア性樹脂としては環状ポリオレフィン系樹脂製の中間層が有効である。
In order to further improve the barrier property of the intermediate layer made of gas barrier resin, oxygen scavenger and oxygen absorbent are mixed and dispersed in the gas barrier resin, or layered silicate is dispersed in MXD-6 nylon resin. It can also be a composite material.
An intermediate layer made of a cyclic polyolefin resin is effective as a barrier resin against moisture.

本発明の積層プリフォームに係る成形方法は上記した方法であり、以下に示す効果を奏する。
すなわち、中間層樹脂を、中間層を形成する流路に断続的に供給することにより、中間層樹脂の供給を停止した時間帯では合流点で、基体層を形成する主材樹脂を周状に連結させることができ、その結果、射出成形される積層プリフォームには、周状に断続回数に応じた個数、並列状に基体層が連結した周帯状連結部を形成することができる。
The molding method according to the laminated preform of the present invention is the method described above, and has the following effects.
That is, by intermittently supplying the intermediate layer resin to the flow path that forms the intermediate layer, the main material resin that forms the base layer is circumferentially formed at the junction in the time zone when the supply of the intermediate layer resin is stopped. As a result, the laminated preform to be injection-molded can be formed with a circumferential band-like connecting portion in which the base layers are connected in parallel in the number corresponding to the number of intermittent cycles.

一方、中間層樹脂が流動する円環状の流路において、この中間層を周方向に分断し、そしてこの中間層を周方向に分断した状態で基体層の間に積層させることにより、中間層が分断した部分で基体層を連結させることができ、射出成形される積層プリフォームには、中心軸方向にこの遮断縦リブ片の配設個数に応じた個数、並列状に、基体層が連結した縦帯状連結部を形成することができ、
所定の高さ領域で、周状及び中心軸方向に複数、並列状に基体層が連結した周帯状連結部と縦帯状連結部を有し、中間層がこれら周帯状連結部と縦帯状連結部により周方向と中心軸方向に分断した特殊な積層構造を有する積層プリフォームを成形することができる。
On the other hand, in an annular flow path through which the intermediate layer resin flows, the intermediate layer is divided between the base layers in a state where the intermediate layer is divided in the circumferential direction and the intermediate layer is divided in the circumferential direction. The base layer can be connected at the divided part, and the base layer is connected in parallel in the number corresponding to the number of the cut vertical rib pieces arranged in the central axis direction in the laminated preform to be injection molded. A vertical belt-like connecting part can be formed,
In a predetermined height region, there are a plurality of circumferential strips in the circumferential direction and the central axis direction, and there are a circumferential strip connection portion and a longitudinal strip connection portion in which the base layers are coupled in parallel, and the intermediate layer has these circumferential strip connection portion and the longitudinal strip connection portion. Thus, a laminated preform having a special laminated structure divided in the circumferential direction and the central axis direction can be formed.

以下、本発明の積層プリフォームの成形方法について実施例に沿って図面を参照しながら説明する。
図1、2は中間層を縦横に分断した状態で積層した壜体の一例を示すものであり、図1(a)は正面図、図1(b)は軸方向での中間層の積層態様を示す縦断面図、図2は図1中のA−A線に沿って示す平断面図である。
この壜体201はPET樹脂を主材樹脂とし、炭酸成分を含む飲料向けに使用される、所謂、耐圧PETボトルで、壜体201は口筒部202、ネックリング203、肩部204、円筒状の胴部205、複数の脚を突出して所謂ペタロイド状の形状とした底部206から成っている。
Hereinafter, a method for forming a laminated preform of the present invention will be described along with examples with reference to the drawings.
1 and 2 show an example of a case in which the intermediate layer is laminated in a state where the intermediate layer is divided vertically and horizontally, FIG. 1A is a front view, and FIG. 1B is an axially laminated state of the intermediate layer. FIG. 2 is a plan sectional view taken along line AA in FIG.
The casing 201 is a so-called pressure-resistant PET bottle that uses PET resin as a main material resin and is used for beverages containing a carbonic acid component. The casing 201 has a mouth tube portion 202, a neck ring 203, a shoulder portion 204, a cylindrical shape. And a bottom portion 206 having a so-called petaloid shape by projecting a plurality of legs.

この壜体201の所定の高さ領域h2(この例ではネックリング203の下端直下から底部206の上端部直上に至る高さ領域)では、図1(b)、図2に示されるように主材樹脂であるPET樹脂製の基体層である外層211と内層212の間にガスバリア性樹脂であるポリキシリレンジアミンアジパミド(MXD6ナイロン)樹脂製の中間層213を積層した積層構造を有する。   In a predetermined height region h2 of this casing 201 (in this example, a height region extending from just below the lower end of the neck ring 203 to just above the upper end of the bottom portion 206), as shown in FIGS. It has a laminated structure in which an intermediate layer 213 made of a polyxylylenediamine adipamide (MXD6 nylon) resin, which is a gas barrier resin, is laminated between an outer layer 211, which is a base layer made of PET resin, which is a material resin, and an inner layer 212.

ここで、所定の高さ領域h2において中間層213は、図1(b)に見られるように、基体層である外層211と内層212を連結して壜体201の、軸方向に複数(本実施例では5本)、並列状に形成される周帯状連結部214pにより、中間層213が軸方向に分断されている。
さらに、中間層213は、図2に見られるように、基体層である外層211と内層212を連結して壜体201の、周方向に複数(本実施例では16本)、並列状に、軸方向に沿って縦方向に延設される縦帯状連結部214aにより周方向に分断されている。
Here, in the predetermined height region h2, as shown in FIG. 1B, the intermediate layer 213 is connected to the outer layer 211 and the inner layer 212, which are base layers, in the axial direction of the casing 201. The intermediate layer 213 is divided in the axial direction by a peripheral band-shaped connecting portion 214p formed in parallel.
Further, as shown in FIG. 2, the intermediate layer 213 is formed by connecting the outer layer 211 and the inner layer 212, which are base layers, in the circumferential direction of the casing 201, a plurality (16 in this embodiment), in parallel. It is divided in the circumferential direction by a vertical belt-like connecting portion 214a extending in the vertical direction along the axial direction.

そして、図1(a)の正面図に見られるように、中間層213は隣接する周帯状連結部214pと、隣接する縦帯状連結部214aにより4辺を囲われるようにして矩形状に分断した状態で外層211と内層212の間に積層している。
なお、上端部に位置する中間層213と下端部に位置する中間層213はそれぞれ、その上端あるいは下端を、中間層213が積層されていないネックリング203を含む口筒部202、あるいは底部206に接している。
なお、図1の正面図では中間層213が積層されている領域をわかり易いようにクロスハッチングにより示しているが、実際には中間層213と外層211あるいは内層212は密着状態にあり、外観上は透明な壜体である。
As shown in the front view of FIG. 1A, the intermediate layer 213 is divided into a rectangular shape so that the four sides are surrounded by the adjacent peripheral belt-like connecting portion 214p and the adjacent vertical belt-like connecting portion 214a. The outer layer 211 and the inner layer 212 are stacked in a state.
The intermediate layer 213 positioned at the upper end and the intermediate layer 213 positioned at the lower end are respectively connected to the mouth tube 202 including the neck ring 203 on which the intermediate layer 213 is not stacked, or the bottom 206. It touches.
In the front view of FIG. 1, the region where the intermediate layer 213 is laminated is shown by cross-hatching for easy understanding. However, the intermediate layer 213 and the outer layer 211 or the inner layer 212 are actually in close contact with each other, and the appearance is It is a transparent enclosure.

ここで、従来のこの種の耐圧積層PETボトルでは、飲料を飲むにあたってキャップを取り外すと、壜体内部の圧力の急激な低下に伴なって、胴壁が急激に陥没変形し、この急激な変形に伴なって中間層213と外層211あるいは内層212の層間に剪断力が作用し、ナイロン樹脂製の中間層213とPET樹脂製の外層211あるいは内層212は密着しているものの接着はしていないので、層間剥離が発生し、この剥離部分における光の散乱あるいは反射等により外からも剥離していることが認識され、外観が損なわれてしまう。   Here, in this type of conventional pressure-resistant laminated PET bottle, when the cap is removed for drinking, the body wall suddenly collapses and deforms as the pressure inside the housing suddenly decreases. As a result, a shearing force acts between the intermediate layer 213 and the outer layer 211 or the inner layer 212, and the intermediate layer 213 made of nylon resin and the outer layer 211 or inner layer 212 made of PET resin are in close contact, but not bonded. Therefore, delamination occurs, and it is recognized that the delamination is also caused by light scattering or reflection at the delamination portion, and the appearance is impaired.

一方、本実施例の積層壜体201では、中間層213を軸方向と周方向に分断する周帯状連結部214pと縦帯状連結部214aの作用効果が発揮され、上記のような圧力の急激な低下によっても層間剥離を効果的に抑制することができ、外観を良好に、透明な状態で維持することができる。
なお、周帯状連結部214pと縦帯状連結部214aによる上記のような層間剥離を抑制する作用効果は、外層(基体層)211/中間層213/内層(基体層)212と云う積層構造が隣接する周帯状連結部214pや隣接する縦帯状連結部214a間と云う短いスパン間で変形するので、これら連結部により区画される、中間層213が積層した小さな領域では変形の大きさが限定されるため、層間に作用する剪断力が抑制されるためと推察される。
On the other hand, in the laminated casing 201 of the present embodiment, the effect of the peripheral belt-like connecting portion 214p and the vertical belt-like connecting portion 214a that divides the intermediate layer 213 in the axial direction and the peripheral direction is exhibited, and the pressure suddenly increases as described above. Even if it falls, delamination can be suppressed effectively and a favorable external appearance can be maintained in a transparent state.
Note that the effect of suppressing the above-described delamination by the peripheral belt-like connecting portion 214p and the vertical belt-like connecting portion 214a is that the laminated structure of the outer layer (base layer) 211 / intermediate layer 213 / inner layer (base layer) 212 is adjacent. Since the deformation occurs in a short span such as between the peripheral belt-like connecting portion 214p and the adjacent vertical belt-like connecting portion 214a, the size of the deformation is limited in a small region where the intermediate layer 213 is laminated, which is partitioned by these connecting portions. For this reason, it is assumed that the shearing force acting between the layers is suppressed.

次に、図3、4は上記した積層壜体201の2軸延伸ブロー成形に使用する一次成形品であると共に、後述する本発明の成形方法により成形される積層プリフォームを示すものであり、図3は部分縦断した正面図、図4は図3中のB−B線に沿って示す平断面図である。
この積層プリフォーム101はPET樹脂を主材料といた試験管状の形状をしたものであり、口筒部102、ネックリング103、円筒状の胴部105、底部106から成っている。
Next, FIGS. 3 and 4 are primary molded products used for the biaxial stretch blow molding of the above-described laminated casing 201, and show a laminated preform molded by the molding method of the present invention described later. 3 is a partially longitudinal front view, and FIG. 4 is a cross-sectional plan view taken along line BB in FIG.
The laminated preform 101 has a test tubular shape made of PET resin as a main material, and includes a mouth tube portion 102, a neck ring 103, a cylindrical body portion 105, and a bottom portion 106.

そして、このプリフォーム101の積層構造を見ると、
所定の高さ領域h1(本実施例ではネックリング103の下端直下から底部106の上端部直上に至る高さ領域)では、図4の平断面図に示されるように主材樹脂であるPET樹脂製の基体層である外層111と内層112の間にガスバリア性樹脂であるポリキシリレンジアミンアジパミド(MXD6ナイロン)樹脂製の中間層113を積層した積層構造を有する。
And when looking at the laminated structure of this preform 101,
In a predetermined height region h1 (in this embodiment, a height region extending from just below the bottom end of the neck ring 103 to just above the top end of the bottom portion 106), as shown in the plane sectional view of FIG. It has a laminated structure in which an intermediate layer 113 made of polyxylylenediamine adipamide (MXD6 nylon) resin which is a gas barrier resin is laminated between an outer layer 111 and an inner layer 112 which are made of a base layer.

そして、この中間層113は、図3中の縦断面部分で示されるように、基体層である外層111と内層112を連結してプリフォーム101の、軸方向に複数(本実施例では5本)、並列状に、周帯状連結部114pにより軸方向に分断されていると共に、図4に見られるように、外層111と内層112を連結してプリフォーム101の、周方向に複数(本実施例では16本)、並列状に、軸方向に沿って縦方向に延設される縦帯状連結部114aにより周方向に分断されている。   Then, as shown in the vertical cross section in FIG. 3, the intermediate layer 113 is connected to the outer layer 111 and the inner layer 112, which are base layers, and a plurality of (in this embodiment, five in the axial direction) the preform 101. ), In parallel, divided in the axial direction by the circumferential band-like connecting portion 114p, and as shown in FIG. 4, the outer layer 111 and the inner layer 112 are connected to each other in the circumferential direction of the preform 101 (this embodiment). In the example, 16 pieces are divided in the circumferential direction by a longitudinal strip-like connecting portion 114a extending in the longitudinal direction along the axial direction in parallel.

次に、上記した周帯状連結部114pと縦帯状連結部114aにより軸方向と周方向に中間層113を分断した積層構造を有する積層プリフォーム101の成方法についてその実施の形態を説明する。
図5〜図7は本発明の成形方法で使用する射出成形装置の一実施例で、その要部を概略的に示すものであり、図5は多重ノズル部11の一例を示す断面図で下流側に金型1を取り付けた状態を示し、図6は図1の多重ノズル部11の上流側にホットランナーブロック21を組付けた状態を示す断面図であり、図7は図6中のC−C線に沿って示す多重ノズル部11の平断面図である。
Next, a description will be given of an embodiment of a method for forming the laminated preform 101 having a laminated structure in which the intermediate layer 113 is divided in the axial direction and the circumferential direction by the above-described peripheral belt-like connecting portion 114p and vertical belt-like connecting portion 114a.
5 to 7 show an embodiment of an injection molding apparatus used in the molding method of the present invention, schematically showing the main part thereof, and FIG. 5 is a cross-sectional view showing an example of the multi-nozzle part 11 in the downstream. 6 shows a state in which the mold 1 is attached to the side, FIG. 6 is a cross-sectional view showing a state in which the hot runner block 21 is assembled on the upstream side of the multiple nozzle portion 11 in FIG. 1, and FIG. It is a plane sectional view of multiple nozzle part 11 shown along line -C.

この、射出成形装置は2種類の異なる樹脂を個別に溶融状態で供給する樹脂供給部A、Bと、2種の溶融樹脂を積層する多重ノズル部11と、プリフォームを形成する金型1を有する。
このうち、多重ノズル部11は基体層である内層と外層を形成する円環状の内流路15および外流路17と、中間層を形成する円環状の中流路16の3ケの層形成流路が配設されており、これら3ケの層形成流路の下流側に、各層形成流路を流動する樹脂が合流する合流点18を介して円筒状の合流路19を配設している。
The injection molding apparatus includes resin supply units A and B that individually supply two different types of resins in a molten state, a multiple nozzle unit 11 that stacks two types of molten resins, and a mold 1 that forms a preform. Have.
Among these, the multi-nozzle portion 11 has three layer-forming channels, an annular inner channel 15 and an outer channel 17 that form an inner layer and an outer layer that are base layers, and an annular middle channel 16 that forms an intermediate layer. A cylindrical joining channel 19 is arranged on the downstream side of these three layer forming channels via a junction 18 where the resin flowing in each layer forming channel joins.

そして、中流路16の所定位置から合流点18に至る範囲に、この中流路16を周方向に複数の流路に分断するように、中流路16を横断する遮断縦リブ片16Rを周方向に複数、並列状に(本実施例では16ケ)配設している。
図7の平断面図によりこの遮断縦リブ片16Rを周方向に複数、並列状に配設した状態をみることができるが、中流路16を横断するように周方向に等中心角度で16ケの遮断縦リブ片16Rが配設されている。
Then, in the range from the predetermined position of the middle flow path 16 to the junction 18, the blocking vertical rib piece 16R that crosses the middle flow path 16 is circumferentially divided so as to divide the middle flow path 16 into a plurality of flow paths in the circumferential direction. A plurality are arranged in parallel (16 in this embodiment).
A state in which a plurality of the blocking vertical rib pieces 16R are arranged in parallel in the circumferential direction can be seen from the plan sectional view of FIG. This is provided with a blocking vertical rib piece 16R.

さらに詳述すると、図7に示されるように円環状の内流路15、中流路16、外流路17は、同軸心状に内側から外側に向けて配設されるシャットオフピン20、リングマンドレル24c、24d、24eにより形成されており、
遮断縦リブ片16Rはリングマンドレル24cに、周壁を貫通状に形成される貫通スリット24csを挿通して、先端面を外側のリングマンドレル24dの内周面に当接させた状態で中流路16を横断するようにセットされ、この円環状の中流路16を周方向に複数の縦帯状の流路に分断している。
More specifically, as shown in FIG. 7, the annular inner flow path 15, middle flow path 16, and outer flow path 17 are coaxially arranged from the inner side toward the outer side with a shut-off pin 20, a ring mandrel. 24c, 24d, 24e,
The blocking vertical rib piece 16R is inserted into the ring mandrel 24c through the through slit 24cs formed through the peripheral wall so that the middle flow path 16 is in contact with the inner peripheral surface of the outer ring mandrel 24d. The annular middle flow path 16 is divided into a plurality of vertical belt-shaped flow paths in the circumferential direction.

次に、上記射出成形装置を使用した、図3、4に示される積層プリフォーム101に係る、本発明の成形方法における工程を説明する。
樹脂供給部Aから供給される主材樹脂であるPET樹脂を供給口22a、ホットランナーである流路23aを経て、そして樹脂供給部Bから供給される中間層樹脂であるナイロン樹脂を供給口22b、流路23bを経て、予め設定されたタイミングで多重ノズル部11に供給し、この多重ノズル部11内でこれら2種(3層)の樹脂を合流させて金型1のキャビティ1a内に充填する。(図6参照)
Next, steps in the molding method of the present invention relating to the laminated preform 101 shown in FIGS. 3 and 4 using the injection molding apparatus will be described.
The PET resin, which is the main material resin supplied from the resin supply part A, passes through the supply port 22a, the flow path 23a, which is a hot runner, and the nylon resin, which is an intermediate layer resin supplied from the resin supply part B, is supplied to the supply port 22b. Then, it is supplied to the multiplex nozzle portion 11 at a preset timing through the flow path 23b, and these two kinds (three layers) of resin are merged in the multiplex nozzle portion 11 and filled in the cavity 1a of the mold 1. To do. (See Figure 6)

上記樹脂供給部A、Bには、例えばスクリュー式の押出機、あるいは押出機の先端に付設されたプランジャを有したアキュムレータ等の装置が使用される。   For the resin supply units A and B, for example, a screw type extruder or an apparatus such as an accumulator having a plunger attached to the tip of the extruder is used.

そして、主材樹脂は流路23aに連通する導入路12aを通って2つのマニホールド14a1、14a2によりそれぞれ円環状の内流路15および外流路17に分配供給される。
また、中間層樹脂は流路23bに連通する導入路12bを通ってマニホールド14bより円環状の中流路16に供給される。
The main material resin is distributed and supplied to the annular inner flow path 15 and the outer flow path 17 by the two manifolds 14a1 and 14a2 through the introduction path 12a communicating with the flow path 23a.
Further, the intermediate layer resin is supplied from the manifold 14b to the annular middle flow path 16 through the introduction path 12b communicating with the flow path 23b.

そして、合流点18で中流路16からの中間層樹脂を内流路15と外流路17から流入する主材樹脂の間に流動させて、合流路19内で一定の時間範囲に亘って主材樹脂の間に中間層樹脂を同軸心状の中間層とした円柱状の多層溶融樹脂流体を形成し、金型1のキャビティ1a内に射出し、充填する。
ここで、中流路16内で円環状に形成された中間層樹脂は、下流側に周方向に複数、並列状に配設される遮断縦リブ片16Rにより周方向に分断され、この分断された状態で主材樹脂の間に積層され、図3、4に示される積層プリフォーム101の縦帯状連結部114aが形成される。
Then, the intermediate layer resin from the middle flow path 16 is caused to flow between the main material resin flowing in from the inner flow path 15 and the outer flow path 17 at the merge point 18, and the main material in the merge flow path 19 over a certain time range. A cylindrical multilayer molten resin fluid having an intermediate layer resin as a coaxial intermediate layer is formed between the resins and injected into the cavity 1a of the mold 1 and filled.
Here, the intermediate layer resin formed in an annular shape in the middle flow path 16 is divided in the circumferential direction by a plurality of cutoff vertical rib pieces 16R arranged in parallel in the circumferential direction on the downstream side, and this divided In this state, it is laminated between the main material resins to form the vertical band-like connecting portion 114a of the laminated preform 101 shown in FIGS.

次に、図8は図3に示されるプリフォーム101を成形するための、主材樹脂および中間層樹脂の射出パターンの一例であり、横軸を時間軸、縦軸を射出速度として概略的に示したものである。この射出パターンは所謂、同時射出成形の一つのパタンーンであるが、この例では中間層樹脂の射出の開始と停止を所定の時間間隔で繰り返し(本実施例では6回繰り返している)、中間層113を形成する中間層樹脂を断続的に中流路16に供給するようにしている。   Next, FIG. 8 is an example of the injection pattern of the main material resin and the intermediate layer resin for molding the preform 101 shown in FIG. 3, and the horizontal axis is the time axis and the vertical axis is the injection speed. It is shown. This injection pattern is one pattern of so-called simultaneous injection molding. In this example, the start and stop of the injection of the intermediate layer resin is repeated at predetermined time intervals (in this embodiment, 6 times), and the intermediate layer is repeated. The intermediate layer resin forming 113 is intermittently supplied to the middle flow path 16.

図9はこの射出パターンによる金型キャビティ1a内における樹脂の流動を示した説明図である。
図9(a)は射出パターンのE時点直前での状態であり、主材樹脂のみが充填された状態を示す、E時点で断続的な中間層樹脂の射出が開始し、E〜F時点間では中間層樹脂が、主材樹脂の間に、上述したように遮断縦リブ片16Rにより周方向に分断されると共に、図8に示した射出パターンにより軸方向にも分断した状態で積層して、金型キャビティ1aに充填する(図8(b)参照)。
次に、F時点ではバリア樹脂の射出が終了し、再び主材樹脂のみの充填となり、射出工程を終了(図9(c)参照)し、積層プリフォーム101が成形されるが、図8の射出パターンに沿った工程により、図3に示される積層プリフォーム101の周帯状連結部114pが形成される。
FIG. 9 is an explanatory view showing the flow of resin in the mold cavity 1a by this injection pattern.
FIG. 9A shows a state immediately before the E point of the injection pattern, showing a state in which only the main material resin is filled, and intermittent injection of the intermediate layer resin starts at the E point, and between the E and F points. Then, the intermediate layer resin is laminated between the main material resins in the state of being divided in the circumferential direction by the blocking vertical rib pieces 16R as described above and also in the axial direction by the injection pattern shown in FIG. Then, the mold cavity 1a is filled (see FIG. 8B).
Next, at the point F, the injection of the barrier resin is completed, and only the main material resin is filled again, the injection process is finished (see FIG. 9C), and the laminated preform 101 is molded. By the process along the injection pattern, the peripheral band-like connecting portion 114p of the laminated preform 101 shown in FIG. 3 is formed.

そして、この周帯状連結部114pと遮断縦リブ片16Rによる縦帯状連結部114aとにより、図3、4に示したような中間層113がこれら周帯状連結部114pと縦帯状連結部114aにより縦横に分断された積層構造を有する積層プリフォーム101を得ることができる。   The intermediate band 113 as shown in FIGS. 3 and 4 is formed vertically and horizontally by the peripheral belt-like connecting portion 114p and the vertical belt-like connecting portion 114a by the peripheral belt-like connecting portion 114p and the vertical belt-like connecting portion 114a formed by the blocking vertical rib pieces 16R. A laminated preform 101 having a laminated structure divided into two can be obtained.

なお、図8の射出パターンに沿って中間層樹脂の供給の開始と停止を、予め決めた所定の時間に高精度に、かつ瞬間的に実施するためには、特に停止時に瞬時に中間層を切るためには、中間層樹脂の供給部Bにおいて、スクリューを瞬時に後退させる、所謂プルバックと云う方法が有効である。   In order to carry out the start and stop of the supply of the intermediate layer resin along the injection pattern of FIG. 8 at a predetermined time with high accuracy and instantaneously, the intermediate layer is instantly applied particularly during the stop. In order to cut, a so-called pull back method in which the screw is instantaneously retracted in the intermediate layer resin supply part B is effective.

以上、実施例に沿って、本発明の積層プリフォームの成形方法の実施形態を説明したが、本発明はこれらの実施例に限定されるものではない。
たとえば、本発明の成形方法による積層プリフォームは上記実施例のように2種3層のものに限定されるものではなく、最終的な製品としてのブロー成形壜体の使用目的に応じてさまざまな積層構造とすることができる。
図10は本発明の成形方法によって得られる最終製品である積層壜体の積層構造の他の例を、図2同様の平断面図で示すものであり、(a)、(b)、(c)3つの積層構造を示しており、これら(a)、(b)、(c)はそれぞれ次のような積層構造である。
(a)外側から基体層211/中間層213/リサイクル樹脂を使用した基体層211R/中間層213/基体層211の3種5層である。
(b)外側から基体層211/中間層213A/基体層211/他の中間層213B/基体層211の3種5層である。
(c)は外側から基体層211/中間層213A/他の中間層213B/基体層211の3種4層である。
なお、これら積層構造では、中間層はいずれも両側に積層する基体層が連結した周帯状連結部114pと縦帯状連結部114aにより分断されている。
As mentioned above, although embodiment of the shaping | molding method of the lamination | stacking preform of this invention was described along the Example, this invention is not limited to these Examples.
For example, the laminated preform according to the molding method of the present invention is not limited to two types and three layers as in the above-described embodiments, and various preforms may be used depending on the purpose of use of the blow molded casing as the final product. It can be a laminated structure.
FIG. 10 shows another example of the laminated structure of the laminated casing, which is the final product obtained by the molding method of the present invention, in the same plane cross-sectional view as FIG. 2, and (a), (b), (c 3) Three stacked structures are shown, and (a), (b), and (c) each have the following stacked structure.
(A) The substrate layer 211 / intermediate layer 213 / substrate layer 211R using the recycled resin / intermediate layer 213 / substrate layer 211 are three types and five layers from the outside.
(B) From the outside, there are three types and five layers of substrate layer 211 / intermediate layer 213A / substrate layer 211 / other intermediate layer 213B / substrate layer 211.
(C) is three types and four layers of base layer 211 / intermediate layer 213A / other intermediate layer 213B / base layer 211 from the outside.
In these laminated structures, the intermediate layer is divided by a peripheral belt-like connecting portion 114p and a vertical belt-like connecting portion 114a in which base layers laminated on both sides are connected.

また、上記実施例では周帯状連結部114pを5ケ、縦帯状連結部114aの本数を16ケ形成するようにしたが、これら連結部の形成個数、幅等の形成態様は積層壜体の使用目的、ガスバリア性等の中間層に基づく機能、さらにはプリフォーム、あるいはこのプリフォームを一次成形品とする壜体の成形性(生産性)等を考慮して適宜、決めることができる。   Further, in the above embodiment, the circumferential belt-like connecting portions 114p are formed in five pieces and the number of the vertical belt-like connecting portions 114a is formed in sixteen pieces. It can be determined as appropriate in consideration of the purpose, the function based on the intermediate layer such as gas barrier properties, and the moldability (productivity) of the preform or the casing that uses the preform as a primary molded product.

また上記実施例では壜体201において周帯状連結部214pについても、縦帯状連結部214aについても、その形成間隔を一定間隔にするようにしているが、必ずしも一定間隔にする必要はなく、層間剥離の発生のし易さ等を考慮してある領域では形成間隔を狭くする等、適宜調整することができる。
また上記例では丸形壜体の例を説明したが、角形壜体とすることもでき、この場合はその形状が等方ではないので、複数の縦帯状連結部の形成位置を上記実施例のように等中心角度にではなく、層間剥離の発生しやすい角度位置を考慮し決めることもできる。
Further, in the above-described embodiment, the formation interval of the peripheral belt-like connecting portion 214p and the vertical belt-like connecting portion 214a in the housing 201 is set to be a constant interval, but it is not necessarily required to be constant, and delamination is not necessary. In consideration of easiness of occurrence, etc., the formation interval can be appropriately adjusted in a region.
In the above example, an example of a round casing has been described. However, a rectangular casing can also be used, and in this case, the shape is not isotropic. As described above, it is also possible to determine not only the equi-center angle but also an angular position at which delamination is likely to occur.

また、上記実施例では主体樹脂をPET樹脂、中間層樹脂をナイロン樹脂製としたが、壜体の使用目的や、成形性、そして中間層に期待する機能を考慮して、さまざまな合成樹脂の組み合わせとすることができる。
In the above embodiment, the main resin is made of PET resin and the intermediate layer resin is made of nylon resin. However, various synthetic resins are used in consideration of the purpose of use of the casing, moldability, and functions expected of the intermediate layer. Can be a combination.

本発明の成形方法による積層プリフォームを2軸延伸ブロー成形することにより、周帯状連結部と縦帯状連結部により中間層を縦横に分断した積層構造を有する壜体を容易に得ることができ、またこのような壜体によれば、成形収縮や、壜体内の圧力変化等に起因する中間層と外層あるいは内層との層間剥離を効果的に抑制することができ、炭酸飲料等の分野での幅広い使用展開が期待される。
By biaxially stretch-blowing the laminated preform by the molding method of the present invention, it is possible to easily obtain a casing having a laminated structure in which the intermediate layer is divided vertically and horizontally by the peripheral belt-like connecting portion and the vertical belt-like connecting portion, Further, according to such a casing, it is possible to effectively suppress delamination between the intermediate layer and the outer layer or the inner layer due to molding shrinkage, pressure change in the casing, etc. Wide range of usage is expected.

(a)は中間層を縦横に分断した状態で積層した壜体の一例を示す正面図、(b)は軸方向での中間層の積層態様を示す縦断面図である。(A) is a front view which shows an example of the housing laminated | stacked in the state which divided | segmented the intermediate | middle layer vertically and horizontally, (b) is a longitudinal cross-sectional view which shows the lamination | stacking aspect of the intermediate | middle layer in an axial direction. 図1中のA−A線に沿って示す平断面図である。It is a plane sectional view shown along the AA line in FIG. 本発明の成形方法により成形される積層プリフォームを示す部分縦断正面図である。It is a partial longitudinal front view which shows the lamination | stacking preform shape | molded by the shaping | molding method of this invention. 図3中のB−B線に沿って示す平断面図である。FIG. 5 is a cross-sectional plan view taken along line BB in FIG. 3. 本発明の成形方法に使用する射出成形装置の多重ノズルの一例を示す断面図である。It is sectional drawing which shows an example of the multiple nozzle of the injection molding apparatus used for the shaping | molding method of this invention. 図5の多重ノズル部にホットランナーブロックを組付けた状態を示す断面図である。It is sectional drawing which shows the state which assembled | attached the hot runner block to the multiple nozzle part of FIG. 図6中のC−C線に沿って示す多重ノズル部の平断面図である。FIG. 7 is a plan sectional view of a multiple nozzle portion shown along line CC in FIG. 6. 図3のプリフォームを成形するための射出パターンの一例を示す説明図である。It is explanatory drawing which shows an example of the injection pattern for shape | molding the preform of FIG. 図8の射出パターンによる金型キャビティへの溶融樹脂の充填過程を示す説明図である。It is explanatory drawing which shows the filling process of the molten resin to the metal mold cavity by the injection pattern of FIG. 本発明の成形方法に係る壜体の積層構造の他の例を示す、平断面である。It is a plane cross section which shows the other example of the laminated structure of the housing which concerns on the shaping | molding method of this invention. 積層壜体の従来例を示す正面図である。It is a front view which shows the prior art example of a laminated housing. 積層プリフォームの従来例を示す部分縦断正面図である。It is a partial vertical front view which shows the prior art example of a laminated preform.

符号の説明Explanation of symbols

1 ;金型
1a;キャビティ
11;多重ノズル部
12a;(主材樹脂)導入路
12b;(中間層樹脂)導入路
14a1、14a2、14b;マニホールド
15;内流路
16;中流路
16R;遮断縦リブ片
17;外流路
18;合流点
19;合流路
20;シャットオフピン
21;ホットランナーブロック
22a;(主材樹脂)供給口
22b;(中間層樹脂)供給口
23a;流路
23b;流路
24c、24d、24e;リングマンドレル
24cs;貫通スリット
A ;樹脂供給部(主材樹脂用)
B ;樹脂供給部(中間層樹脂用)
101、501;プリフォーム
102、502;口筒部
103、503;ネックリング
105、505;胴部
106、506;底部
111、511;外層(基体層)
112、512;内層(基体層)
113、513;中間層
114p;周帯状連結部
114a;縦帯状連結部
h1;高さ領域
201,601;壜体
202、602;口筒部
203、603;ネックリング
204、604;肩部
205、605;胴部
206、606;底部
211、611;外層(基体層)
212、612;内層(基体層)
213、613;中間層
214p;周帯状連結部
214a;縦帯状連結部
h2;高さ領域
DESCRIPTION OF SYMBOLS 1; Mold 1a; Cavity 11; Multiple nozzle part 12a; (Main material resin) introduction path 12b; (Interlayer resin) Introduction path 14a1, 14a2, 14b; Manifold 15; Inner flow path 16; Middle flow path 16R; Rib piece 17; outer channel 18; junction 19; junction 20; shutoff pin 21; hot runner block 22a; (main material resin) supply port 22b; (interlayer resin) supply port 23a; 24c, 24d, 24e; ring mandrel 24cs; through slit A; resin supply part (for main resin)
B: Resin supply part (for intermediate layer resin)
101, 501; Preform 102, 502; Mouth tube 103, 503; Neck ring 105, 505; Body 106, 506; Bottom 111, 511; Outer layer (base layer)
112, 512; inner layer (base layer)
113, 513; intermediate layer 114p;
114a; vertical belt-like connecting portion h1; height regions 201 and 601; housings 202 and 602; mouth tube portions 203 and 603; neck rings 204 and 604; shoulder portions 205 and 605; ; Outer layer (base layer)
212, 612; inner layer (base layer)
213, 613; intermediate layer 214p;
214a; vertical belt-like connecting part h2; height region

Claims (4)

射出成形装置を用いた2軸延伸ブロー成形用の試験管状の積層プリフォームの成形方法であって、前記積層プリフォーム(101)は、基体層、及び所定の高さ領域で前記基体層の間に中間層(113)を有すると共に、前記所定の高さ領域(h1)で、周状及び中心軸方向に複数、並列状に基体層が連結した周帯状連結部(114p)と縦帯状連結部(114a)を有し、前記中間層(113)が周帯状連結部(114p)と縦帯状連結部(114a)により周方向と中心軸方向に分断した積層構造を有するものであり、前記基体層を形成する主材樹脂と前記中間層(113)を形成する中間層樹脂を積層する多重ノズル部(11)を有する射出成形装置を用い、前記ノズル部(11)において、所定時間、所定の圧力若しくは速度で前記主材樹脂を基体層を形成する円環状の流路に供給し、また、前記所定時間範囲内の一定時間、同時に他の供給部から断続的に中間層樹脂を、中間層を形成する円環状の流路に供給すると共に、該流路内で中間層樹脂を周方向に分断し、該中間層樹脂を、軸方向及び周方向に分断した状態で主材樹脂の間に合流させて積層溶融樹脂流体を形成し、該積層溶融樹脂流体を金型キャビティ(1a)に充填することを特徴とする積層プリフォームの成形方法。 A method of forming a test tubular laminated preform for biaxial stretch blow molding using an injection molding apparatus, wherein the laminated preform (101) is formed between a base layer and the base layer at a predetermined height region. In the predetermined height region (h1), a plurality of circumferentially and centrally axially connected base layer layers (114p) and a longitudinal belt-like connecting portion are connected in parallel. (114a), and the intermediate layer (113) has a laminated structure in which the intermediate layer (113) is divided in the circumferential direction and the central axis direction by a peripheral belt-like connecting portion (114p) and a vertical belt-like connecting portion (114a), and the base layer Using the injection molding apparatus having a multiple nozzle part (11) for laminating the main material resin forming the intermediate layer resin forming the intermediate layer (113), in the nozzle part (11), for a predetermined time, a predetermined pressure Alternatively, the main material resin is supplied to the annular flow path forming the base layer at a speed, and within the predetermined time range. At the same time, the intermediate layer resin is intermittently supplied from another supply unit to the annular flow path forming the intermediate layer, and the intermediate layer resin is divided in the circumferential direction in the flow path. The resin is divided between the main resin in a state of being divided in the axial direction and the circumferential direction to form a laminated molten resin fluid, and the laminated molten resin fluid is filled in the mold cavity (1a). A method for forming a laminated preform. 使用する射出成形装置を、少なくとも、主材樹脂と中間層を形成する中間層樹脂を供給する2ケの樹脂供給部と、該主材樹脂と中間層樹脂を積層する多重ノズル部(11)と、プリフォームを形成する金型(1)を有し、前記多重ノズル部(11)が、少なくとも、主材樹脂による基体層を形成する円環状の内流路(15)及び外流路(17)と、該内流路(15)と外流路(17)の間に位置し中間層樹脂による中間層を形成する円環状の中流路(16)の3ケの層形成流路を有し、該少なくとも3ケの層形成流路の下流側に、各層形成流路を流動する溶融樹脂が合流する合流点(18)を介して合流路(19)を配設し、前記中間層樹脂が流動する中流路(16)の所定位置から合流点(18)に至る範囲に、周方向に複数、並列状に、該中流路(16)を横断する遮断縦リブ片(16R)を配設し、該遮断縦リブ片(16R)により中流路(16)を周方向に複数の流路に分断する構成を有するものとし、前記射出成形装置を用い、前記供給部から所定時間、所定の圧力若しくは速度で基体層を形成する主材樹脂を内流路(15)と外流路(17)に供給し、また、前記所定時間範囲内の一定時間、同時に他の供給部から断続的に中間層を形成する中間層樹脂を中流路(16)に供給し、該中流路(16)内で中間層樹脂を前記遮断縦リブ片(16R)により周方向に分断し、合流点(18)で前記中間層樹脂を、軸方向及び周方向に分断した状態で内流路(15)と外流路(17)からの主材樹脂の間に流動させて、合流路(19)内で積層溶融樹脂流体を形成し、該積層溶融樹脂流体を金型キャビティ(1a)に充填することを特徴とする請求項1記載の積層プリフォームの成形方法。 An injection molding apparatus to be used includes at least two resin supply parts for supplying an intermediate layer resin and an intermediate layer resin for forming an intermediate layer, and a multiple nozzle part (11) for laminating the main material resin and the intermediate layer resin. A mold (1) for forming a preform, and the multiple nozzle part (11) has at least an annular inner channel (15) and an outer channel (17) for forming a base layer made of a main material resin. And three layer-forming channels of an annular middle channel (16) which is located between the inner channel (15) and the outer channel (17) and forms an intermediate layer made of an intermediate layer resin, A junction channel (19) is disposed downstream of at least three layer formation channels via a junction (18) where molten resin flowing in each layer formation channel merges, and the intermediate layer resin flows. In the range from the predetermined position of the middle flow path (16) to the confluence (18), a plurality of cut-off longitudinal rib pieces (16R) crossing the middle flow path (16) are arranged in parallel in the circumferential direction, Cut-off vertical rib piece (16R) The main material for forming the base layer at a predetermined pressure or speed from the supply unit for a predetermined time using the injection molding apparatus, wherein the middle flow path (16) is divided into a plurality of flow paths in the circumferential direction by Resin is supplied to the inner flow path (15) and the outer flow path (17), and an intermediate layer resin that forms an intermediate layer intermittently from another supply section at the same time for a certain time within the predetermined time range (the middle flow path ( 16), and in the middle flow path (16), the intermediate layer resin is divided in the circumferential direction by the blocking vertical rib piece (16R), and at the junction (18), the intermediate layer resin is axially and circumferentially divided. In a state of being divided into a main material resin from the inner flow path (15) and the outer flow path (17), forming a laminated molten resin fluid in the combined flow path (19), the laminated molten resin fluid The method for forming a laminated preform according to claim 1, wherein the mold cavity (1a) is filled. プリフォーム(101)において口筒部(102)及び底部(106)を除いた部分を所定の高さ領域(h1)とした請求項1または2記載の積層プリフォームの成形方法。 The method for forming a laminated preform according to claim 1 or 2, wherein a portion of the preform (101) excluding the mouth tube portion (102) and the bottom portion (106) is a predetermined height region (h1). プリフォーム(101)を主材樹脂と中間層(113)を形成するガスバリア性樹脂からなる2種3層の積層構造を有するものとした請求項1、2または3記載の積層プリフォームの成形方法。 The method for molding a laminated preform according to claim 1, 2 or 3, wherein the preform (101) has a laminated structure of two types and three layers comprising a main material resin and a gas barrier resin forming the intermediate layer (113). .
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EP09773420.6A EP2311624B1 (en) 2008-06-30 2009-06-29 Synthetic-resin laminated bottle body
US13/001,212 US8607999B2 (en) 2008-06-30 2009-06-29 Laminated synthetic resin bottle, injection molding device, and process for molding a laminated preform
CN2009801004219A CN101801641B (en) 2008-06-30 2009-06-29 Synthetic-resin laminated bottle body, injection molding device and method for forming laminated preform
EP18194845.6A EP3459707B1 (en) 2008-06-30 2009-06-29 Injection molding device and process for molding a laminated preform
CA2729527A CA2729527C (en) 2008-06-30 2009-06-29 Laminated synthetic resin bottle, injection molding device, and process for molding a laminated preform
AU2009264613A AU2009264613B2 (en) 2008-06-30 2009-06-29 Laminated synthetic resin bottle, injection molding device, and process for molding a laminated preform
PCT/JP2009/061820 WO2010001842A1 (en) 2008-06-30 2009-06-29 Synthetic-resin laminated bottle body, injection molding device and method for forming laminated preform
KR1020107005004A KR101277925B1 (en) 2008-06-30 2009-06-29 Synthetic-resin laminated bottle body, injection molding device and method for forming laminated preform
US14/057,244 US9096003B2 (en) 2008-06-30 2013-10-18 Laminated synthetic resin bottle, injection molding device, and process for molding a laminated preform

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