CA1227760A - Biaxially oriented plastic container with excellent heat-resistence and gas barrier properties - Google Patents

Biaxially oriented plastic container with excellent heat-resistence and gas barrier properties

Info

Publication number
CA1227760A
CA1227760A CA000475607A CA475607A CA1227760A CA 1227760 A CA1227760 A CA 1227760A CA 000475607 A CA000475607 A CA 000475607A CA 475607 A CA475607 A CA 475607A CA 1227760 A CA1227760 A CA 1227760A
Authority
CA
Canada
Prior art keywords
gas barrier
barrier properties
biaxially oriented
container
plastic
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.)
Expired
Application number
CA000475607A
Other languages
French (fr)
Inventor
Kazumi Machida
Hiroyuki Orimoto
Yoshinori Nakamura
Daiichi Aoki
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.)
Nissei ASB Machine Co Ltd
Original Assignee
Nissei ASB Machine 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 Nissei ASB Machine Co Ltd filed Critical Nissei ASB Machine Co Ltd
Application granted granted Critical
Publication of CA1227760A publication Critical patent/CA1227760A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B29C45/1646—Injecting parison-like articles
    • 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
    • B29C49/0005—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the material
    • 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
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a general shape other than plane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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—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, by deep-drawing operations performed on sheet material
    • 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—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, 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B29C45/1646—Injecting parison-like articles
    • B29C2045/1648—Injecting parison-like articles the parison core layer being a barrier material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/081—Specified dimensions, e.g. values or ranges
    • B29C2949/0829—Height, length
    • B29C2949/0837—Height, length 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
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3008—Preforms or parisons made of several components at neck portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—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
    • 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
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • 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
    • 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
    • B29K2995/0068—Permeability to liquids; Adsorption
    • B29K2995/0069—Permeability to liquids; Adsorption non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
    • B32B2262/10—Inorganic fibres
    • B32B2262/101—Glass fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/60—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.]
    • Y10T428/131—Glass, ceramic, or sintered, fused, fired, or calcined metal oxide or metal carbide containing [e.g., porcelain, brick, cement, etc.]
    • Y10T428/1314—Contains fabric, fiber particle, or filament made of glass, ceramic, or sintered, fused, fired, or calcined metal oxide, or metal carbide or other inorganic compound [e.g., fiber glass, mineral fiber, sand, etc.]
    • 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]

Abstract

ABSTRACT OF THE DISCLOSURE

A biaxially oriented plastic container having, in section, three layers formed by concentrically injecting two types of plastic into a cavity to mold a bottomed parison and stretch-blow molding said parison to form a biaxially oriented container with excellent heat-resistance and gas barrier properties; said two types of plastic having between them an intermediate layer of plastic having selected lengths of glass fiber.

Description

,4.5~ 6 I` /
~227760 SPECIFICATION

TITLE OF THE INVENTION
-BIAXIALLY ORIENTED PLASTIC CONTAINER WITH
EXCELLENT HEAT-RESISTANCE AND GAS BARRIER PROPERTIES

BACKGROUND OF THE INVENTION
1. Field of the Invention This invention relates to a biaxially oriented container such as a bottle wherein two kinds of plastics are concentrically injected into a cavity to form a prison, and the prison is stretch-blow molded to obtain a section in the form of a three-layer, which is excellent in heat-resistance and gas barrier properties.
2. Prior Art Plastics used for biaxially oriented containers include plastics, which have the gas barrier properties but are poor in heat-resistance, such as polyethylene terephthalate, vinyl chloride and vinylidene chloride, and plastics which have the heat-resistance but are poor in gas barrier properties, such as polycarbonate, polystyrene and polypropylene.
In bottles for carbonated drinks and the live, both pressure-resistance and gas barrier properties are regarded as important but for container for accommodating contents l;;~Z7760 require heating when or after the container is filled, it is said that they should have the heat-resistance in addition to the gas barrier properties.
Accordingly, the plastics such as polycarbonate having the heat-resistance are poor in gas barrier properties, and therefore, they are difficult to be used for the packing containers. The polyethylene terephthalate which has the gas barrier properties and can withstand a filling temperature by heat treatment is widely used not only as containers for carbonated drinks but as packing containers for contents which require heating and filling.
However, since there is a limit in gas barrier properties and heat-resistance of polyethylene terephthalate, a means is merely left in which plastics accepted as a container material and plastics having the gas barrier properties or heat-resistance may be formed into a composite in order to obtain a packing container with excellent performances.
The plastics as a container may be formed into a composite by making a sectional composition of wall portions of the container a two-layer or a three-layer. However, in either case, both the gas barrier properties and heat-resistance are not yet enhanced by one layer.

.

lZ27760 SUMMARY OF THE INVENTION
This invention has been achieved in view of the above-described circumstances. An object of the invention is to provide a biaxially oriented thin-wallthickness container in which gas barrier properties and heat-resistance which are still insufficient are improved by the provision of an intermediate layer inside plastics which form a container.
It is a further object of the present invention to provide a biaxially oriented container which comprises an intermediate layer made of an inorganic material which is itself excellent in heat-resistance as compared with any other thermoplastics and even has gas barrier properties.
A biaxially oriented container according to the present invention having the above-described objects is a container which has three sections, wherein a plastic which forms a container and an inorganic material which forms an intermediate layer are concentrically injected into a cavity to form a prison which composition of wall portions has three layers, and said prison is stretch-blow molded, the resultant container being provided with the gas barrier properties and heat-resistance by the provision of said intermediate layer.
For the above-described inorganic material, glass fiber is used. The length of the glass fiber is preferably
- 3 -122776(~

in the range of 1 to 4 mm, and said glass fiber is used while being mixed with plastics having the gas barrier properties for the purpose of improving the fluidity at the time of injection and the gas barrier properties.
The above-described plastics having the gas barrier properties include saponified ethylene-vinylacetate copolymer, ethylene-vinylalcohol copolymer, m-xylene-type polyamide, and polyethylene terephthalate, and the glass fiber in the ratio of 0.5 - 3.0 weight % is added these plastics.
Plastics for forming a container include polyethylene terephthalate, vinyl chloride, polystyrene, polypropylene, and polycarbonate, which are accepted as materials for containers, these material being acceptable as far as stretch-; blow molding is possible to make.
The molding conditions of prisons required to obtain a biaxially oriented container according to this invention are determined by the molding conditions of plastics of which a container is formed. Even in the case where the glass fiber as the intermediate layer is simultaneously injected into the cavity, molding without major difference from the case of a single layer may be carried out without occurrence of bubbles as far as the glass fiber is sufficiently mixed with plastics for forming the intermediate layer along with the glass fiber and the same is charged with high back pressure.

~lZZ7760 Furthermore, even in stretch-blow molding of prisons, it is possible to obtain a biaxially oriented container having an intermediate layer without constituting an obstacle to axial stretching and radial expansion due to air pressure if the amount of glass fiber is in the range of 0.5 - 3.0 weight %.

BRIEF DESCRIPTION OF THE DRAWING
The single drawing is a partially enlarged longitudinal sectional view of a biaxially oriented container with excellent heat-resistance and gas barrier properties in accordance with this invention.

DETAILED DESCRIPTION OF THE INVENTION
In the figure, a reference numeral 1 designates a bottle, and a side wall 2 and a bottom wall 3 are molded into a three-layer in section. Two inner and outer layers
4 which forms the bottle 1 is formed from stretch-blow moldable thermoplastic resin.
A reference numeral 5 designates an intermediate layer, which comprises a material in which a glass fiber 6 is mixed into thermoplastic resin having gas barrier properties, the heat-resistance being imparted to the bottle 1 by the glass fiber 6. In this case, when the amount of glass fiber in the plastics exceeds 3.0 weight %, stretch-- i227760 blow molding of the injection-molded bottomed prison becomes difficult, and if the content thereof is small in amount, the good result is not obtained.
The above-described bottle 1 may be very easily molded by already known means. This molding comprises positioning plastic of the intermediate layer 5 with glass fiber mixed therewith in the center of resin for forming the inner and outer layers 4, 4, injecting both materials into the cavity in a concentric fashion, and molding a bottomed prison which has three layers in section.
A thickness of the intermediate layer within said prison varies with the object of use of bottles molded, and the percentage between the inner and outer layers and the intermediate layer can be controlled at will by the injection quantity.
The aforesaid bottle 1 may be easily molded by axially stretching the prison by conventional means and expanding it by air pressure.
In the bottle 1 with glass fiber molded in the aforementioned process, the glass fiber is not exposed to the surface of the bottle 1 in the state it is contained inside, and therefore the external appearance as a bottle is not impaired and the shock strength in the bottom wall 3 of the bottle 1 increases, and therefore, it is possible to simplify the construction of the bottom as compared with a l.Z;~7760 conventional bottle molded as a self-support bottle.
Next, examples and a comparative example are described.
Example 1 Inner and outer layers:
Polyethylene terephthalate Intermediate layer:
saponified ethylene-vinylacetate copolymer 2 weight % of glass fiber (length; 3 mm) Wall-thicknesses (mm):
Outer layer - 0.12, intermediate layer - 0.15 and inner layer - 0.14.
Example 2 Inner and outer layers:
Polyethylene terephthalate Intermediate layer:
Polyethylene terephthalate 2.5 weight % of glass fiber (length: 3 mm) Wall-thicknesses (mm):
Outer layer - 0.15, intermediate layer - 0.16 and inner layer - 0.11.
Comparative example Degree of shrinkage of 90C hot water (%) Example 1 3.4 - 3.6 Example 2 3.2 - 3.4 *PET (single layer) 25 - 30 ~Z27760 * The bottle of PET (polyethylene terephthalate) is so deformed that the external appearance is disappeared but those in Examples 1 and 2 show no variation in external appearance. In addition, the gas barrier properties are also enhanced as compared with the case of the single layer.

: - 8 -.

Claims (3)

THE EMBODIMENTS OF THE INVENTION TO WHICH AN EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a biaxially oriented container having three layers in section obtained by concentrically injecting two kinds of plastics into a cavity to mold a bottomed parison and stretch-blow molding said parison to form said biaxially oriented container with excellent heat-resistance and gas barrier properties) an intermediate layer of said container being formed of plastic containing selected lengths of glass fiber; said glass fiber having a length of 1-4 mm and being present in a percentage of 0.5-3.0 percent by weight with respect to plastic which forms the intermediate layer.
2. A biaxially oriented container with excellent heat-resistance and gas barrier properties as defined in Claim 1 in which the plastic for forming said intermediate layer comprises plastic with excellent gas barrier pro-perties.
3. A biaxially oriented container with excellent heat-resistance and gas barrier properties as defined in Claim 1 in which said intermediate layer consists of plastic material selected from the group consisting of polyethylene terephthalate, saponified ethylene-vinylacetate copolymer, ethylene-vinylalcohol copolymer, and m-xylene-type polyamide.
CA000475607A 1984-03-02 1985-03-01 Biaxially oriented plastic container with excellent heat-resistence and gas barrier properties Expired CA1227760A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59-40071 1984-03-02
JP59040071A JPS60183334A (en) 1984-03-02 1984-03-02 Biaxial oriented vessel having excellent heat resistance andgas barrier property

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CA1227760A true CA1227760A (en) 1987-10-06

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US (1) US4680208A (en)
EP (1) EP0153894B1 (en)
JP (1) JPS60183334A (en)
KR (1) KR920000005B1 (en)
AU (1) AU577094B2 (en)
CA (1) CA1227760A (en)
DE (1) DE3575708D1 (en)
ES (1) ES292867Y (en)

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Publication number Publication date
ES292867Y (en) 1987-04-16
AU3929485A (en) 1985-09-05
EP0153894A3 (en) 1987-08-12
KR850006155A (en) 1985-10-02
JPH0427094B2 (en) 1992-05-11
US4680208A (en) 1987-07-14
ES292867U (en) 1986-08-01
EP0153894A2 (en) 1985-09-04
AU577094B2 (en) 1988-09-15
EP0153894B1 (en) 1990-01-31
KR920000005B1 (en) 1992-01-06
JPS60183334A (en) 1985-09-18
DE3575708D1 (en) 1990-03-08

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