WO2003018292A1 - Primary molded product for biaxial stretch blow molded bottle body, and bottle body - Google Patents

Primary molded product for biaxial stretch blow molded bottle body, and bottle body Download PDF

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Publication number
WO2003018292A1
WO2003018292A1 PCT/JP2002/008738 JP0208738W WO03018292A1 WO 2003018292 A1 WO2003018292 A1 WO 2003018292A1 JP 0208738 W JP0208738 W JP 0208738W WO 03018292 A1 WO03018292 A1 WO 03018292A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas barrier
barrier material
mouth
material layer
bottle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2002/008738
Other languages
English (en)
French (fr)
Inventor
Akio Hashimoto
Masato Suzuki
Tadashi Asai
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Kogyosho Co Ltd
Original Assignee
Yoshino Kogyosho Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Priority to CA2444558A priority Critical patent/CA2444558C/en
Priority to EP02767868.9A priority patent/EP1433587B1/en
Priority to KR1020037001996A priority patent/KR100881261B1/ko
Priority to US10/471,996 priority patent/US8524340B2/en
Priority to AU2002332273A priority patent/AU2002332273B2/en
Publication of WO2003018292A1 publication Critical patent/WO2003018292A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Rigid or semi-rigid containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material or by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • 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
    • B29C49/08—Biaxial stretching during blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
    • 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
    • B29C49/22—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
    • B29C2049/222—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons only parts of the preforms or parisons are layered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C2949/0819—Wall thickness of a layer
    • 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
    • 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
    • B29C2949/3008—Preforms or parisons made of several components at neck portion
    • B29C2949/3009—Preforms or parisons made of several components at neck portion partially
    • 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
    • B29C2949/3012—Preforms or parisons made of several components 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3016—Preforms or parisons made of several components 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/302—Preforms or parisons made of several components at bottom portion
    • B29C2949/3022—Preforms or parisons made of several components at bottom portion partially
    • 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
    • B29C2949/3026—Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique having two or more components
    • B29C2949/3028—Preforms 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
    • 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
    • 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
    • B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected
    • B29C2949/3036—Preforms or parisons made of several components having components being injected having two or more components being injected having three or more components being injected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
    • B29C49/4283—Deforming the finished article
    • B29C49/42832—Moving or inverting sections, e.g. inverting bottom as vacuum panel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0065—Permeability to gases
    • B29K2995/0067—Permeability to gases non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2009/00—Layered products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y10T428/1383—Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]

Definitions

  • the present invention relates to a primary molded article and a bottle of a biaxially stretched blow-molded bottle laminated with a gas barrier material.
  • PET resin polyethylene terephthalate resin
  • the mouth of the bottle with the laminated structure (the neck portion including the neck ring; hereinafter the same) is a portion that is not stretched and has a large wall thickness.
  • the above-mentioned conventional technology does not allow the upper end (flow front) of the gas barrier material layer to reach the lower end of the mouth due to variations during preform molding.
  • Gas in the mouth almost as well as the torso to prevent Since the barrier material layer is provided, usually about 20 to 40% of the gas barrier material to be filled, that is, about 30% of the gas barrier material on average, is located in the lower part.
  • the gas barrier material in the mouth was wasted and the gas barrier material was not effectively used.
  • the present invention has been devised to solve the above-mentioned problems in the prior art, and is a primary molded product and a bottle of a biaxially stretched blow molded bottle provided with a gas barrier material layer in a PET resin layer.
  • the technical issue is to minimize the amount of gas barrier material laminated in the mouth of the body, and to use gas barrier material effectively, and in the case of heat-resistant bottles that whiten the mouth, It is an object of the present invention to make it possible to easily and surely form a dimension after whitening of a predetermined dimension. Disclosure of the invention
  • the means of the invention according to claim 1 is a biaxially stretched blow molded bottle obtained by laminating at least one gas barrier material layer in a resin layer mainly composed of polyethylene terephthalate.
  • the gas barrier material layer is provided at least in the middle of the mouth including the neck ring, at least from the upper part of the neck ring to the substantially lower end of the bottomed cylindrical body.
  • the upper end of the gas barrier material layer is formed at least in the middle of the mouth, at least from the upper portion of the neck ring.
  • the gas barrier material layer does not exist on the shoulder or the upper end of the body of the blow-molded bottle at all. Since the gas barrier material layer in the mouth is formed from the middle of the mouth and the average thickness is 1Z3 or less of the maximum thickness of the gas barrier material layer in the body, the amount of the gas barrier material located in the mouth is However, the amount of the gas barrier material is much smaller than the amount of the gas barrier material located in the torso, so that almost all of the gas barrier material is located in the torso, so that the gas ply material can be effectively used.
  • a biaxially stretched blow molded bottle in which at least one gas barrier material layer is laminated in a resin layer mainly composed of polyethylene terephthalate.
  • the gas barrier material layer is at least a neck ring in the middle of the mouth including the neck ring. From the upper part of the body to the position within the range from the lower end and the bottom of the trunk,
  • the occupancy of the gas barrier material layer in the mouth should be within 15% of the total gas barrier material weight
  • the occupation ratio of the gas barrier material at the mouth of the bottle formed by the biaxially-stretched plug and the mouth is formed within 15% with respect to the total weight of the gas barrier material.
  • the amount of gas barrier material located in the mouth is greater than the amount of gas barrier material located in the body. Therefore, almost all of the gas barrier material is located in the body, so that the gas barrier material can be effectively used.
  • the thickness of the gas barrier material layer in the mouth is extremely thin, and the gas barrier material layer of the parentheses is biased toward the lower part of the mouth. There is almost no influence of the gas barrier material on the size, and the dimension after whitening of the mouth can be easily and reliably formed to the set dimension.
  • FIG. 1 is an overall semi-longitudinal sectional view showing one embodiment of the preform of the present invention.
  • FIG. 2 is an enlarged longitudinal sectional view of a main part of the embodiment shown in FIG.
  • FIG. 3 is an overall front view of one embodiment of a bottle formed from the preform shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • Preform 1 which is a primary molded product of a biaxially stretched blow-molded bottle, is formed into a laminated structure of PET resin nogas barrier material Z PET resin by a co-extrusion molding method or the like.
  • the gas ply material layer 3 in the PET resin layer 2 is provided from a height approximately in the middle of the mouth portion 4 including the neck ring 5 to a substantially lower end portion of the body portion 6, and a mouth portion 4 provided with a thread on the outer peripheral surface is provided.
  • Approximately the upper half and the bottom 7 are made of PET resin alone.
  • the thickness of the gas barrier material layer 3 in the mouth 4 is made as thin as possible (preferably, the maximum thickness of 110 or more of the gas barrier material layer 3 in the body 6). It is preferable that the average thickness is 1 to 3 to 110, which is the maximum thickness of the gas barrier material layer 3 in the body 6.
  • the thickness of the gas barrier material layer 3 in the mouth 4 is set to the maximum 0.3 mm, the smallest part is 0.05 mm, and the average is 0.15 mm.
  • the gas barrier material examples include a gas barrier resin such as an ethylene butyl alcohol copolymer (EVO H) and a polyamide containing m_xylylenediamine (product name: MXD-6), and an aliphatic nylon and an aromatic nylon.
  • Oxygen-absorbing resins that are commonly used in the form of inorganic or organic acid salts containing transition metal catalysts (e.g., Co, Fe, Mn, Ni, Ti) It is preferable to include them.
  • the present embodiment shows an example of two types and three layers of PETZ gas barrier material PET, the present invention is not limited to this, and the inner and outer layers are made of a material obtained by blending a gas barrier material with PET resin. It is also possible to form a two-layer, five-layer or three-layer, five-layer structure of, for example, PETZ gas pallet PET (including the case of using recycled material) and gas barrier PET.
  • FIG. 3 shows an example of a PET resin bottle 1 biaxially stretched and blow molded from a preform 1 as a primary molded product according to the present invention.
  • Bottle 1 shown in Fig. 3 is a 500ml bottle, and the mouth 4 connected to the upper end of the body 6 'via the shoulder is the same as the mouth 4 of the preform 1.
  • Table 1 shows the gas barrier material filling rate and gas barrier properties of this bottle 1, together with comparative examples.
  • the gas pallier material used was MXD-6 (trade name, manufactured by Mitsubishi Gas Chemical Co., Ltd.), and the flow front position was the same in both cases.
  • the final product is formed by a single stretch blow molding.
  • the usual biaxial stretch blow molding method for forming the final product can be used, as shown in Japanese Patent Publication No. 07-677332.
  • a method of forming a biaxially stretched opening by a combination of two stretch blow moldings and a forced heat shrinking step can be appropriately applied. table 1
  • the biaxially stretched blow-molded bottle 1 ′ formed from the primary molded product in a stretched-to-blow-molding manner also has a gas barrier material in the mouth 4, as compared with the comparative example.
  • the thickness of the gas barrier material layer 3 in the body 6 ′ can be increased accordingly, effectively utilizing the gas barrier material effectively.
  • the gas barrier property of the bottle 1 ′ is improved.
  • the present invention has the above-described configuration, and has the following effects.
  • the gas barrier material layer in the mouth is formed from the middle of the mouth, and the average thickness thereof is 1 to 3 or less of the maximum thickness of the gas barrier material layer in the body.
  • the amount of the gas barrier material used in the department can be greatly reduced, and the effective use of the gas barrier material can be achieved.
  • the upper end of the gas barrier material layer is formed at least at the upper part of the neck ring in the middle of the mouth, even if there is variation during molding, the flow front of the gas barrier material layer does not reach the lower end of the mouth. Therefore, there is no possibility that a portion where the gas barrier material layer does not exist is formed on the shoulder and the upper end of the body of the blow-molded bottle.
  • the occupancy of the gas barrier material at the mouth of the biaxially stretched blow-molded bottle is formed within 15% of the total gas barrier material weight.
  • the amount of the gas barrier material located in the mouth is much smaller than the amount of the gas barrier material located in the body, so that almost all of the gas barrier material is located in the body. The material can be used effectively.
  • the thickness of the gas barrier material layer in the mouth is extremely thin, so that the gas barrier material has almost no effect on the shrinkage due to the whitening treatment.
  • the dimensions can be easily and reliably formed to the set dimensions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)

Description

二軸延伸ブロー成形壜体の一次成形品及ぴ壜体
技術分野
明
本発明は、 ガスバリア材を積層した二軸延伸ブロー成形壜体の一次成 形品及び壜体に関するものである。 田
背景技術
ポリエチレンテレフタレート樹脂 （以下、 P E T樹脂とも云う） 等の 二軸延伸ブロー成形壜体は、 近年、 より薄肉化しているため、 ガスバリ ァ性に対する要求が一層高まっている。
このような要求に対して、 共射出成形法等により、 ？£丁樹脂 ガス バリァ材 / P E T樹脂の積層構造を有する壜体成形用の一次成形品 （以 下、 プリフォームとも云う） を成形する力、 或いは、 P E T樹脂にナイ ロン （MX D—6 ) などのガスパリァ材をブレンドした一次成形品を射 出成形し、 これを二軸延伸ブロー成形することにより、 二次成形品であ る壜体にガスバリア性を付与することが行なわれている。
ところで、 前者の積層構成の壜体の口部 （ネックリングを含む口筒部 を云う。 以下、 同じ） は、 延伸されない部分であって肉厚が厚くなつて いるので、 特にガスバリア材層を設けなくても、 充分なガスバリア性を 有しているのであるが、 上記した従来技術にあっては、 プリフォーム成 形時のバラツキにより、 ガスバリア材層の上端 （フローフロント） が口 部の下端まで達しないことを防止すべく、 口部にも胴部と略同様にガス バリア材層を設けているので、 通常、 充填されるガスバリア材全体量に 対して、 2 0〜4 0 %程度、 平均して約 3 0 %程度のガスバリア材がロ 部に位置することになり、 口部におけるガスバリア材の無駄となり、 ガ スバリア材が有効利用されていない、 と云う問題があった。
また、 口部を白化 （熱結晶化） 処理する耐熱壜体にあっては、 口部内 に多量のガスバリァ材層が存在すると、 P E T樹脂とガスバリア材との 収縮率の相違により、 白化処理による収縮度合いが小さくなるため、 口 部の白化後寸法が設定値よりも大きくなる傾向があり、 口部形状が楕円 形状になり易く、 設定寸法に確実に形成し難い、 と云う問題があった。 そこで、 本発明は、 上記した従来技術における問題点を解消すべく創 案されたもので、 P E T樹脂層内にガスバリア材層を設けた二軸延伸ブ ロー成形壜体の一次成形品及ぴ壜体において、 口部内に積層するガスバ リア材をできるだけ少なくすることを技術的課題とし、 もって、 ガスバ リァ材の有効利用を図ると共に、 口部を白化処理する耐熱壜体にあって は、 口部の白化後寸法を、 設定寸法に容易に確実に形成できるようにす ることを目的とする。 発明の開示
上記技術的課題を解決する本発明の内、 請求項 1記載の発明の手段は、 ポリエチレンテレフタレートを主体とする樹脂層内に、 ガスバリア材層 を、 少なくとも一層以上積層した二軸延伸ブロー成形壜体の一次成形品 に関するものであること、
ガスバリア材層を、 ネックリングを含めた口部の途中の、 少なくともネ ックリングの上位部分から有底筒状をした胴部の略下端部まで設けるこ と、
口部におけるガスバリア材層の平均肉厚を、 胴部内のガスバリア材層の 最大肉厚の 1 3以下に形成すること、
にある。
この請求項 1記載の発明にあっては、 ガスバリア材層の上端を、 口部 の途中の、 少なくともネックリングの上位部分から形成するので、 成形 時にバラツキがあっても、 ガスバリア材層のフローフロントが口部の下 端まで達しないことは全く無く、 よって、 ブロー成形された壜体の肩部 や胴部上端部に、 ガスバリア材層が存在しない箇所が生じる恐れは無い。 口部内のガスバリア材層を、 口部の途中から、 かつその平均肉厚を胴 部内のガスバリア材層の最大肉厚の 1 Z 3以下に形成するので、 口部内 に位置するガスバリア材の量は、 胴部内に位置するガスバリア材の量に 比べてはるかに少なく、 このためガスパリァ材の殆ど全てを、 胴部内に 位置させることになり、 もって、 ガスパリァ材の有効利用を図ることが できる。
また、 本発明の内、 請求項 2記載の発明の手段は、
ポリエチレンテレフタレートを主体とする樹脂層内に、 ガスバリア材層 を少なくとも一層以上積層した二軸延伸ブロー成形壜体であること、 ガスバリア材層を、 ネックリングを含めた口部の途中の、 少なくともネ ックリングの上位部分から胴部の略下端部と底部に至る範囲内の位置ま でに納める様設けること、
口部内のガスバリア材層の占有率を、 全体のガスバリア材重量に対し 1 5 %以内に形成すること、
Ifしあ 。
この請求項 2記載の発明にあっては、 二軸延伸プ口一成形された壜体 の口部におけるガスバリア材の占有率を、 全体のガスバリア材重量に対 し 1 5 %以内に形成するので、 壜体成形後においても口部内に位置する ガスバリア材の量は、 胴部内に位置するガスパリァ材の量に比べてはる かに少なく、 このためガスバリア材の殆ど全てを、 胴部内に位置させる ことになり、 もって、 ガスバリア材の有効利用を図ることができる。 口部を白化処理する耐熱壜体にあっては、 口部内のガスバリア材層の 肉厚が極めて薄く、 かっこのガスバリア材層が口部の下部に偏って位置 しているので、 白化処理による収縮に対するガスバリア材の影響はほと んど無く、 もって、 口部の白化後寸法を、 設定寸法に容易に確実に形成 することができる。 図面の簡単な説明
図 1は、 本発明のプリフォームの一実施例を示す、 全体半縦断面図で ある。
図 2は、 図 1に示した実施例の、 要部拡大縦断面図である。
図 3は、 図 1に示したプリフォームから成形した壜体の一実施例の、 全体正面図である。 発明を実施するための最良の形態
以下、 本発明の一実施例を、 図面を参照しながら説明する。
二軸延伸ブロー成形壜体の一次成形品であるプリフォーム 1は、 共射 出成形法等により、 P E T樹脂ノガスバリァ材 Z P E T樹脂の積層構造 に成形されている。
P E T樹脂層 2内のガスパリァ材層 3は、 ネックリング 5を含む口部 4の略中間の高さから胴部 6の略下端部まで設けてあり、 外周面に螺条 を設けた口部 4の略上半分および底部 7は、 P E T樹脂単体で形成ざれ ている。
そして、 口部 4内のガスバリア材層 3の肉厚は、 できるだけ薄くする (好ましくは、 胴部 6内のガスバリア材層 3の最大肉厚の 1 1 0以 下） のが良いのであるが、 実用的には、 その平均肉厚を、 胴部 6内のガ スバリァ材層 3の最大肉厚の 1ノ 3〜 1 10に形成するのが良い。 例えば、 50 Om 1壜体用プリフォーム 1の場合、 胴部 6のガスパリ ァ材層 3の最大肉厚 0. 5mmに対して、 口部 4内のガスバリア材層 3 の厚さを、 最大部分で 0. 3 mm、 最小部分で 0. 05mm、 平均で 0. 15 mmに形成する。
ガスバリア材としては、 エチレンビュルアルコール共重合体 （EVO H) 、 m_キシリ レンジァミン含有ポリアミド （商品名 MXD— 6) 等 のガスバリァ性樹脂や、 このガスバリァ性樹脂に脂肪族ナイ口ンおよび 芳香族ナイロンのマトリ ックス中に、 遷移金属系触媒 （例えば C o、 F e、 Mn、 N i、 T i ) を含む無機酸塩、 あるいは有機酸塩の錯塩の形 で一般に使用されている酸素吸収樹脂を含有させたものが好適である。 尚、 本実施例では、 PETZガスバリア材ノ PETの 2種 3層の例を 示しているが、 本発明はこれに限られることはなく、内外層を PET樹 脂にガスバリア材をブレンドした材料で構成したり、 或いは、 層構成を、 例えば PETZガスパリァ材 PET (再生材使用の場合を含む） ガ スバリア材 PETの 2種 5層若しくは 3種 5層構成とすることも可能 である。
次に、 本発明による一次成形品であるプリフォーム 1から二軸延伸ブ ロー成形された PET樹脂製壜体 1， の一例を図 3に示す。
図 3に示した壜体 1， は、 500m l壜体であって、 胴部 6' の上端 に肩部を介して連設された口部 4は、 プリフォーム 1の口部 4と同じで あり、 この壜体 1， のガスバリア材充填率おょぴガスバリア性を、 比較 例と共に、 表 1に示す。 なお、 ガスパリァ材は商品名 MXD— 6 (三菱 ガス化学 （株） 製） を使用し、 そのフローフロント位置は両例で同一と した。 尚、 二軸延伸ブロー成形に当たっては、 1 回の延伸ブロー成形で最終 品を形成^ Tる通常の二軸延伸ブロー成形方法や、 特公平 0 7— 6 7 7 3 2号に示されるような、 2回の延伸ブロー成形と強制加熱収縮工程との 組合わせによる二軸延伸ブ口一成形方法等が適宜適用可能である。 表 1
Figure imgf000008_0001
表 1から明らかなように、 本発明品によれば、 一次成形品から延伸ブ 口一成形した二軸延伸ブロー成形壜体 1 ' においても、 比較例と比べて、 口部 4内のガスバリア材の量が全体量の 1 5 %以内と大幅に減少すると 共に、 その分、 胴部 6 ' 内のガスバリア材層 3の肉厚を厚くすることが できるので、 ガスバリア材の有効利用を効果的に図ることができ、 これ により壜体 1 ' のガスバリア性が向上する。 発明の効果
本発明は、 上記した構成となっているので、 以下に示す効果を奏する < 請求項 1記載の発明においては、 口部内のガスバリア材層を、 口部の 途中から、 かつその平均肉厚を胴部内のガスバリア材層の最大肉厚の 1 ノ 3以下に形成するので、 口部内に使用するガスバリア材の量を大幅に 減らすことができ、 もって、 ガスバリア材の有効利用を図ることができ' る。
また、 ガスバリア材層の上端を、 口部の途中の、 少なくともネックリ ングの上位部分から形成するので、 成形時にバラツキがあっても、 ガス バリア材層のフローフロントが口部の下端まで達しないことは全く無く、 もって、 ブロー成形された壜体の肩部や胴部上端部に、 ガスバリア材層 が存在しない箇所が生じる恐れは無い。
請求項 2記載の発明においては、 二軸延伸ブロー成形された壜体の口 部におけるガスバリア材の占有率を、 全体のガスバリア材重量に対し 1 5 %以内に形成するので、 壜体成形後においても口部内に位置するガス パリア材の量は、 胴部内に位置するガスバリア材の量に比べてはるかに 少なく、 このためガスバリア材の殆ど全てを、 胴部内に位置させること になり、 もって、 ガスパリァ材の有効利用を図ることができる。
また、 口部を白化処理する耐熱壜体にあっては、 口部内のガスバリア 材層の肉厚が極めて薄いので、 白化処理による収縮に対するガスパリア 材の影響はほとんど無く、 もって、 口部の白化後寸法を、 設定寸法に容 易に確実に形成することができる。

Claims

請求の範囲
1 . ポリエチレンテレフタレートを主体とする樹脂層 (2)内に、 ガスバ リァ材層 (3)を少なく とも一層以上積層した二軸延伸ブロー成形壜体の 一次成形品であって、 前記ガスバリア材層 (3)を、 ネックリング (5)を含 めた口部 (4)の途中の、 少なく とも前記ネックリング (5)の上位部分から 有底筒状をした胴部 (6)の略下端部まで設けると共に、 前記口部 (4)内の ガスバリァ材層 (3)の平均肉厚を、 前記胴部 (6)内のガスバリァ材層 (3)の 最大肉厚の 1 / 3以下に形成して成る二軸延伸ブ口一成形壜体の一次成 形品。
2 . ポリエチレンテレフタレートを主体とする樹脂層 (2)内に、 ガスバ リァ材層 (3)を少なく とも一層以上積層した二軸延伸ブロー成形壜体で あって、 前記ガスバリア材層 (3)を、 ネックリングは)を含めた口部 (4)の 途中の、 少なく とも前記ネックリング (5)の上位部分から胴部の略下端 部と底部に至る範囲内の位置までに納める様設けると共に、前記口部 (4) 内のガスバリア材層 (3)の占有率を、 全体のガスバリア材重量に対し 1 5 %以内に形成して成る二軸延伸ブ口一成形壜体。
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CN1463221A (zh) 2003-12-24
CN1238177C (zh) 2006-01-25
US20040146675A1 (en) 2004-07-29
EP1433587B1 (en) 2013-12-18
CA2444558C (en) 2011-04-19
JP2003071911A (ja) 2003-03-12

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