WO1998006557A1 - Improved plastic container and preform for making - Google Patents

Improved plastic container and preform for making Download PDF

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Publication number
WO1998006557A1
WO1998006557A1 PCT/US1997/013590 US9713590W WO9806557A1 WO 1998006557 A1 WO1998006557 A1 WO 1998006557A1 US 9713590 W US9713590 W US 9713590W WO 9806557 A1 WO9806557 A1 WO 9806557A1
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WO
WIPO (PCT)
Prior art keywords
molecular weight
average molecular
preform
intrinsic viscosity
pet
Prior art date
Application number
PCT/US1997/013590
Other languages
French (fr)
Inventor
Stephen W. Cornell
Original Assignee
Crown Cork & Seal Technologies Corporation
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
Priority to US2390196P priority Critical
Priority to US60/023,901 priority
Priority to US79555697A priority
Priority to US08/795,556 priority
Application filed by Crown Cork & Seal Technologies Corporation filed Critical Crown Cork & Seal Technologies Corporation
Publication of WO1998006557A1 publication Critical patent/WO1998006557A1/en

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/36Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B29C49/0005Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor characterised by the choice of material
    • 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
    • B29C49/22Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons
    • B29C49/221Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using multilayered preforms or parisons at least one layer being injected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS 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
    • B65D1/00Containers 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
    • B65D1/02Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • 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
    • B29B2911/00Indexing scheme related to making preforms for blow-moulding bottles or the like
    • B29B2911/14Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like
    • B29B2911/14006Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration
    • B29B2911/14046Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered
    • B29B2911/14053Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered at neck portion
    • 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
    • B29B2911/00Indexing scheme related to making preforms for blow-moulding bottles or the like
    • B29B2911/14Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like
    • B29B2911/14006Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration
    • B29B2911/14046Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered
    • B29B2911/1408Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered at body portion
    • 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
    • B29B2911/00Indexing scheme related to making preforms for blow-moulding bottles or the like
    • B29B2911/14Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like
    • B29B2911/14006Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration
    • B29B2911/14046Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered
    • B29B2911/14093Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered at bottom portion
    • 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
    • B29B2911/00Indexing scheme related to making preforms for blow-moulding bottles or the like
    • B29B2911/14Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like
    • B29B2911/14006Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration
    • B29B2911/14046Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered
    • B29B2911/14106Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered having at least one layer
    • B29B2911/14113Layer configuration, geometry, dimensions or physical properties of preforms for blow-moulding bottles or the like layer configuration multilayered having at least one layer having at least two layers
    • 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
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00Containers; Receptacles
    • B32B2439/40Closed containers
    • B32B2439/60Bottles

Abstract

A preform for making a PET container (20) such as a bottle for a carbonated soft drink includes an outer wall (12) that defines an interior space into which a pressurized fluid may be introduced to expand the preform into a container which includes an interior layer of a first PET material (16) having a first average molecular weight, and an exterior layer (18) of a second PET material having a second average molecular weight that is different from the first average molecular weight. This makes possible a container that has improved stress crack resistance and material creep resistance, in comparison to conventional PET containers, at given wall thickness.

Description

IMPROVED PLASTIC CONTAINER AND PREFORM FOR MAKING BACKGROUND OF THE INVENTION

This application claims §119(e) priority based on provisional application 60/023,901 , filed on August 12, 1996. 1. Field of the Invention

This invention relates in general to the packaging industry, and more particularly, to the field of making plastic containers from a preform, such as the PET containers that are used for packaging soft drinks. 2. Description of the Related Technology Polyethylene terephthalate (PET) is in wide use throughout the world for bottles for carbonated soft drinks. Draw-blow-formed polyester bottles prepared have been broadly used as packaging vessels for carbonated drinks and other products because they have such preferred characteristics as high toughness, light weight, high transparency, high pressure resistance and act as a good gas barrier.

It is well known that by maximizing the average molecular weight of the PET resin, improved strength and creep resistance characteristics will be imparted to the container. It is common in this area of technology to characterize average molecular weight by referring to viscosity data rather than to average molecular weight itself. This is made possible by the known fact that properly normalized viscosity values of similar polymers are reflections of the relative molecular weight of the polymers. The benchmark used for expressing viscosity data is the Intrinsic Viscosity (IV) value, defined as being as measured in o-chlorophenol at 25o C. In order for a conventional PET preform to have sufficient resistance to crystallization during processing, it is generally understood thought that the IV of the polymer must be at least 0.72 dl/g, and very desirably at least 0.78 dl/g. There is no specific upper limit for the IV of the modified PET in the product, but the practical requirements of processing the polymer set an effective upper limit. Generally, during processing (injection molding step) the molecular weight, and the IV, of the polymer tend to decrease.

At present PET containers are nearly invariably made for single use application, meaning that they are intended to be made, filled with a product, the product consumed and the container discarded. This mode of operation has proved economically competitive with single use glass bottles but, environmentally, is less than ideal. A refillable container, i.e., one that is intended to be made, filled with a product, the product consumed, and the container being returned for refilling at least several times before being discarded, would be environmentally preferable. A refillable container must be chemically resistant to the washing medium that is used to clean the container after it is returned and it must resist to stress cracking that is promoted by the washing process and by exposure of the container to other alkaline mediums. As PET containers become thinner and lighter in weight, stress cracking becomes more of a concern. The avoidance of stress cracking is particularly a concern for refillable pressurized footed carbonated soft drink bottles as the filling process for carbonated drinks often applies peak pressures to the bottle in excess of the mean pressure during storage after filling and use. Failure at the filling stage is highly undesirable, not least for the mess it creates. A further need is that the bottle must not change its size or shape during use. A particularly undesirable form of size change arises from creep of the material of the bottle while it is under pressure, e.g., during storage between filling and consumption of the soft drink. Creep typically occurs in the cylindrical main wall of the bottle giving an axial expansion and thus increasing the volume of the bottle. As bottle filling lines typically fill by volume, the apparent extent of filling of the level of drink in the bottle on reuse is lower if the bottle has suffered creep. Not surprisingly, consumers much prefer apparently full bottles to bottles which seem 'underfilled'.

A need exists in this area of technology for an improved PET container and preform therefor that provides better resistance to stress cracking and material creep at a given wall thickness than has been considered possible by use of the conventional technology.

SUMMARY OF THE INVENTION Accordingly, it is an object of the invention to provide an improved PET container and preform therefor that provides better resistance to stress cracking and material creep at a given wall thickness than has been considered possible by use of the conventional technology.

In order to achieve the above and other objects of the invention, a preform for making a PET container such as a bottle for a carbonated soft drink includes an outer wall that defines an interior space into which a pressurized fluid may be introduced to expand the preform into a container, and wherein said outer wall includes an interior layer of a first PET material having a first average molecular weight, and an exterior layer of a second PET material having a second average molecular weight, and wherein the second average molecular weight is different than the first average molecular weight. According to a second aspect of the invention, a PET container, such as a bottle for a carbonated soft drink, includes a neck that defines an opening therein; and a body portion that includes an outer wall that defines an interior space which is in communication with the opening, wherein the outer wall includes an interior layer of a first PET material having a first average molecular weight, and an exterior layer of a second PET material having a second average molecular weight, and wherein the second average molecular weight is different than the first average molecular weight.

These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and forming a part hereof. However, for a better understanding of the invention, its advantages, and the objects obtained by its use, reference should be made to the drawings which form a further part hereof, and to the accompanying descriptive matter, in which there is illustrated and described a preferred embodiment of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIGURE 1 is a fragmentary cross sectional view depicting a preform that is constructed according to a preferred embodiment of the invention;

FIGURE 2 is a fragmentary cross sectional view depicting a container that is constructed according to a preferred embodiment of the invention; and FIGURE 3 is a close up view of a portion of the container that is illustrated in FIGURE 2.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTfS) Referring now to the drawings, wherein like reference numerals designate corresponding structure throughout the views, and referring first to FIGURE 1 , it will be seen that improved preform 10 for making a PET container such as a bottle for a carbonated soft drink includes an outer wall 12 that defines an interior space 14 into which a pressurized fluid may be introduced to expand the preform 10 into a container 20, and that the outer wall 12 includes an interior layer 16 of a first PET material having a first average molecular weight, and an exterior layer 18 of a second PET material that has a second average molecular weight. The second average molecular weight of the exterior layer 18 is different from the first average molecular weight of the interior layer 16, according to one advantageous aspect of the invention.

In a first, preferred embodiment of the invention, the first average molecular weight of the interior layer 16 is greater than the second average molecular weight of the exterior layer 18. More specifically, the first average molecular weight of the interior layer 16 is represented by an intrinsic viscosity (IV) that is between about 0.76 to about 0.86. On the other hand, the second average molecular weight of the exterior layer 18 is represented by an intrinsic viscosity (IV) that is between about 0.65 to about 0.81. Preferably, the first average molecular weight of the interior layer 16 is represented by an intrinsic viscosity (IV) that is between about 0.03 to about 0.15 greater than the intrinsic viscosity of the second average molecular weight of the exterior layer 18. Preferably, the perform 10 includes about 35% to about 80% by weight of the higher molecular weight of the interior layer 16 and about 65% to about 20% by weight of the relatively lower molecular weight exterior layer 18. A PET container 20 that is manufactured from the preform 10 illustrated in FIGURE 1 is depicted in FIGURES 2 and 3. PET container 20, as may be seen in FIGURE 2, includes a neck 22 that defines an opening 24 therein, and a body portion that includes an outer wall 28 that defines an interior space 26 which is in communication with the opening 24. The outer wall 28 includes an interior layer 30 of the first PET material having a first average molecular weight, an exterior layer of 32 of a second PET material having a second average molecular weight. Preferably, again, the first average molecular weight of the interior layer 30 is greater than the second average molecular weight of the exterior layer 32. As a result of the decrease of molecular weight that inherently occurs during processing of the preform 10 into the PET container 20, the first average molecular weight of the interior layer 30 is preferably from between about 0.74 to about 0.86. The second average molecular weight of the exterior layer 32 has an intrinsic viscosity that is preferably between about 0.63 to about 0.81. The container 20 depicted FIGURES 2 and 3 preferably includes about 35% to 80% by weight of the higher molecular weight interior layer 30, and about 65% to about 20% by weight of the relatively lower molecular weight exterior layer 32.

Any of the commonly used stretch blow molding processes can be used to make the PET container 20 from the preform 10. Such processes most be capable of introducing strain induced crystallinity to the level that the container 20 is useful as a pressure vessel.

When a pressure vessel was made from a preform with a 61% by weight exterior layer 18 of PCR (Post-consumer Reclaim) of 0.71 IV and a 39% interior layer 16 of 0.84 IV of PET, the resulting container had a better stress crack resistance than the same container made with 100% by weight 0.84 IV PET when subjected to the same standard stress crack test. Test pressures ranged from 1.8 volumes of carbonation to 4.0 volumes of carbonation. The strain in the exterior layer was relieved to a greater extent than it was in the single material bottle, made from the same tool.

According to a second embodiment of the invention, the first average molecular weight of the interior layer 16 of the preform 10 would be less than the second average molecular weight of the exterior layer 18. This would result in a container 20 that, similarly, have an outer wall 28 wherein the interior layer have a first average molecular weight that is less than second average molecular weight of the exterior layer. By taking advantage of the advantageous design characteristics that are created by the invention, the crystallinity produced in the inside layer may be increased by designing the preform stretch ratio higher than is presently commercially practiced and using the outer layer as a carrier to permit this extra stretching. In addition, an easily crystallized exterior surface can be created which, when heat set by conventional practices, produces higher crystallinity on the surface because of the more rapid crystallization and will result in lower shrinkage of the bottle under desire used conditions than a bottle that is made by the identical practice using a higher IV single layer resin.

It is to be understood, however, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.

Claims

WHAT IS CLAIMED IS:
1. A preform for making a PET container such as a bottle for a carbonated soft drink, comprising: an outer wall that defines an interior space into which a pressurized fluid may be introduced to expand the preform into a container, and wherein said outer wall comprises an interior layer of a first PET material having a first average molecular weight, and an exterior layer of a second PET material having a second average molecular weight, and wherein the second average molecular weight is different than the first average molecular weight.
2. A preform according to claim 1 , wherein the first average molecular weight is greater than the second average molecular weight.
3. A preform according to claim 2, wherein the first average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.76 to about 0.86.
4. A preform according to claim 1 , wherein the first average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.76 to about 0.86.
5. A preform according to claim 2, wherein the second average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.65 to about 0.81.
6. A preform according to claim 1 , wherein the second average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.65 to about 0.81.
7. A preform according to claim 1 , wherein the first average molecular weight is represented by an intrinsic viscosity that is between about
0.03 to about 0.15 greater than an intrinsic viscosity of the second average molecular weight.
8. A preform according to claim 3, wherein the first average molecular weight is represented by an intrinsic viscosity that is between about 0.03 to about 0.15 greater than an intrinsic viscosity of the second average molecular weight.
9. A preform according to claim 5, wherein the first average molecular weight is represented by an intrinsic viscosity that is between about 0.03 to about 0.15 greater than an intrinsic viscosity of the second average molecular weight.
10. A preform according to claim 1 , wherein the first average molecular weight is less than the second average molecular weight.
11. A PET container, such as a bottle for a carbonated soft drink, comprising: a neck that defines an opening therein; and a body portion that comprises an outer wall that defines an interior space which is in communication with said opening, wherein said outer wall comprises an interior layer of a first PET material having a first average molecular weight, and an exterior layer of a second PET material having a second average molecular weight, and wherein the second average molecular weight is different than the first average molecular weight.
12. A preform according to claim 11 , wherein the first average molecular weight is greater than the second average molecular weight.
13. A preform according to claim 12, wherein the first average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.74 to about 0.86.
14. A preform according to claim 11 , wherein the first average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.74 to about 0.86.
15. A preform according to claim 12, wherein the second average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.63 to about 0.81.
16. A preform according to claim 11 , wherein the second average molecular weight is represented by an intrinsic viscosity (IV) that is between about 0.63 to about 0.81.
17. A preform according to claim 11 , wherein the first average molecular weight is represented by an intrinsic viscosity that is between about 0.03 to about 0.15 greater than an intrinsic viscosity of the second average molecular weight.
18. A preform according to claim 13, wherein the first average molecular weight is represented by an intrinsic viscosity that is between about
0.03 to about 0.15 greater than an intrinsic viscosity of the second average molecular weight.
19. A preform according to claim 15, wherein the first average molecular weight is represented by an intrinsic viscosity that is between about 0.03 to about 0.15 greater than an intrinsic viscosity of the second average molecular weight.
20. A preform according to claim 1 , wherein the first average molecular weight is less than the second average molecular weight.
PCT/US1997/013590 1996-08-12 1997-08-01 Improved plastic container and preform for making WO1998006557A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US2390196P true 1996-08-12 1996-08-12
US60/023,901 1996-08-12
US79555697A true 1997-02-06 1997-02-06
US08/795,556 1997-02-06

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU38248/97A AU3824897A (en) 1996-08-12 1997-08-01 Improved plastic container and preform for making

Publications (1)

Publication Number Publication Date
WO1998006557A1 true WO1998006557A1 (en) 1998-02-19

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WO (1) WO1998006557A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6090337A (en) * 1997-07-30 2000-07-18 Plastipak Packaging, Inc. Method for making multi-layer plastic preform for blow molding
US10486891B2 (en) 2016-12-02 2019-11-26 S.C. Johnson & Son, Inc. Plastic bottle for a pressurized dispensing system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105825A2 (en) * 1982-09-07 1984-04-18 THE GOODYEAR TIRE & RUBBER COMPANY Multi-layer polyisophthalate and polyterephthalate articles and process therefor
GB2138350A (en) * 1983-02-28 1984-10-24 Toyo Seikan Kaisha Ltd Process for producing stretched multilayer polyester bottle
JPS6277908A (en) * 1985-09-30 1987-04-10 Unitika Ltd Manufacture of multi-ply polyester prefoam
JPS6279258A (en) * 1985-10-02 1987-04-11 Teijin Ltd Polyester bottle and production thereof
EP0325440A2 (en) * 1988-01-19 1989-07-26 Kamaya Kagaku Kogyo Co., Ltd. Method and apparatus for the manufacture of three-layered containers
EP0335594A2 (en) * 1988-03-26 1989-10-04 Mitsubishi Chemical Corporation Copolymerized polymer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0105825A2 (en) * 1982-09-07 1984-04-18 THE GOODYEAR TIRE & RUBBER COMPANY Multi-layer polyisophthalate and polyterephthalate articles and process therefor
GB2138350A (en) * 1983-02-28 1984-10-24 Toyo Seikan Kaisha Ltd Process for producing stretched multilayer polyester bottle
JPS6277908A (en) * 1985-09-30 1987-04-10 Unitika Ltd Manufacture of multi-ply polyester prefoam
JPS6279258A (en) * 1985-10-02 1987-04-11 Teijin Ltd Polyester bottle and production thereof
EP0325440A2 (en) * 1988-01-19 1989-07-26 Kamaya Kagaku Kogyo Co., Ltd. Method and apparatus for the manufacture of three-layered containers
EP0335594A2 (en) * 1988-03-26 1989-10-04 Mitsubishi Chemical Corporation Copolymerized polymer

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 011, no. 278 (M - 623) 9 September 1987 (1987-09-09) *
PATENT ABSTRACTS OF JAPAN vol. 011, no. 282 (C - 446) 11 September 1987 (1987-09-11) *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6090337A (en) * 1997-07-30 2000-07-18 Plastipak Packaging, Inc. Method for making multi-layer plastic preform for blow molding
US6319574B1 (en) 1997-07-30 2001-11-20 Plastipak Packaging, Inc. Multi-layer plastic preform for blow molding
US10486891B2 (en) 2016-12-02 2019-11-26 S.C. Johnson & Son, Inc. Plastic bottle for a pressurized dispensing system

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Publication number Publication date
AU3824897A (en) 1998-03-06

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