CA2464434A1 - Polypropylene container and process for making it - Google Patents

Polypropylene container and process for making it Download PDF

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Publication number
CA2464434A1
CA2464434A1 CA 2464434 CA2464434A CA2464434A1 CA 2464434 A1 CA2464434 A1 CA 2464434A1 CA 2464434 CA2464434 CA 2464434 CA 2464434 A CA2464434 A CA 2464434A CA 2464434 A1 CA2464434 A1 CA 2464434A1
Authority
CA
Canada
Prior art keywords
container
preform
layer
approximately
thickness
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.)
Granted
Application number
CA 2464434
Other languages
French (fr)
Other versions
CA2464434C (en
Inventor
Guy Richards
A. B. M. Bazlur Rashid
Robert W. Knoll
Sahin Emre
Kevin James Curie
Randolph Lee Davidson
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.)
Alcan Packaging Flexible France SAS
Original Assignee
Individual
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Filing date
Publication date
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Application filed by Individual filed Critical Individual
Publication of CA2464434A1 publication Critical patent/CA2464434A1/en
Application granted granted Critical
Publication of CA2464434C publication Critical patent/CA2464434C/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • 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
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • 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
    • 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
    • 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
    • B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/08—Injection 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • 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
    • B29C49/78—Measuring, controlling or regulating
    • B29C2049/7879—Stretching, e.g. stretch rod
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C2949/07—Preforms or parisons characterised by their configuration
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0723—Preforms or parisons characterised by their configuration having variable wall thickness at flange portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0724—Preforms or parisons characterised by their configuration having variable wall thickness at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/072—Preforms or parisons characterised by their configuration having variable wall thickness
    • B29C2949/0725—Preforms or parisons characterised by their configuration having variable wall thickness 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
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/073—Preforms or parisons characterised by their configuration having variable diameter
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
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    • B29C2949/0732—Preforms or parisons characterised by their configuration having variable diameter at flange portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
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    • B29C2949/0733—Preforms or parisons characterised by their configuration having variable diameter at body portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • B29C2949/0762—Conical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C2949/077—Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C2949/0772—Closure retaining means
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B65D2501/00—Containers having bodies formed in one piece
    • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
    • B65D2501/0018—Ribs
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    • 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
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    • 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
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    • 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
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    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • 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
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31855—Of addition polymer from unsaturated monomers
    • Y10T428/31909—Next to second addition polymer from unsaturated monomers
    • Y10T428/31913—Monoolefin polymer

Landscapes

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

Abstract

Polypropylene containers, preforms, methods and stretchrods used in making them are disclosed.

Claims (50)

1. A multilayer container comprising:
a first layer defining an outermost layer of the container and comprising polypropylene; and a second layer comprising a barrier material, directly bonded to said first layer;
at least one of said first and second layer further comprising an adhesive incorporated therein in an amount of up to approximately 0.20% by weight.
2. The container of claim 1 wherein said first layer comprises up to approximately 0.03% by weight of adhesive.
3. The container of claim 2 wherein the adhesive is maleic anhydride.
4. The container of claim 1 wherein said barrier material comprises EVOH.
5. The container of claim 1 wherein said container has a haze value of less than approximately 29% measured through a section of the container having a total thickness of greater than approximately 0.015 inch.
6. The container of claim 1 having a haze value of approximately 10%-12%
measured through a section of the container having a total thickness of greater than approximately 0.015 inch.
7. A multilayer container comprising:
a first layer defining an innermost layer of the container and comprising polypropylene; and a second layer comprising a barrier material, directly bonded to said first layer;
at least one of said first and second layer further comprising an adhesive incorporated therein in an amount of up to approximately 0.20% by weight.
8. The container of claim 7 wherein said first layer comprises up to approximately 0.03% by weight of adhesive.
9. The container of claim 8 wherein the adhesive is maleic anhydride.
10. The container of claim 7 wherein said barrier material comprises EVOH.
11. The container of claim 7 wherein said container has a haze value of less than approximately 29% measured through a section of the container having a total thickness of greater than approximately 0.015 inch.
12. The container of claim 7 having a haze value of approximately 10%-12%
measured through a section of the container having a total thickness of greater than approximately 0.015 inch.
13. A stretch blow molded multilayer container comprising:
a first layer having polypropylene; and a second layer comprising a barrier material, directly bonded to the first layer, the container having a haze value of less than approximately 29%
through a section of the container having a total wall thickness of at least 0.015 inch.
14. The container of claim 13, the haze value is less than approximately 12%.
15. The container of claim 13 being manufactured by reheat stretch blow molding.
16. The container of claim 13 further comprising a third layer having polypropylene, directly bonded to the second layer opposite the first layer.
17. The container of claim 13, the barrier material being EVOH.
18. The container of claim 13, at least one of the first and third layers further comprising an adhesive agent to facilitate the bonding of the first and third layers to the second layer.
19. A multilayer container comprising:
a first layer defining an innermost layer of the container and comprising a barrier material;
a second layer directly adjacent to the first layer and comprising polypropylene and an adhesive agent;
a third layer directly adjacent to the second layer and comprising a barrier material.
20. The container of claim 19, further comprising a fourth layer defining an outermost layer of the container and comprising polypropylene.
21. The container of claim 20, further comprising a discrete adhesive agent layer between the third Payer and the fourth layer.
22. The container of claim 20, further comprising a regrind layer between the third and fourth layer.
23. The container of claim 19, the adhesive agent comprising a maleic anhydride.
24. The container of claim 22, the maleic anhydride being present in the second layer in the amount of up to 0.03% by weight.
25. An injection molded preform for reheat stretch blow molding a container comprising polypropylene and having a finish, a neck extending from the finish, a sidewall extending from the neck and a base extending from the sidewalk the preform comprising a finish having a support flange, and a preform blow section having a neck extending from the support flange, a sidewall extending from the neck and a base closing the blew section, the preform sidewall having a thickness at feast approximately 2.3 times the thickness of the container sidewall.
26. The preform of claim 24, the preform sidewall having a thickness at least 2.5 times tho thickness of the container sidewall.
27. The preform of claim 24, the preform sidewall having a thickness at least 2.7 times the thickness of the container sidewall.
28. The preform of claim 24, the average thickness of the preform sidewall being at least 2.5 times the average thickness of the container sidewall.
29. The preform of claim 25, the preform sidewall thickness varying from 0.074-0.120 inch and the container sidewall thickness ranging from 0.425-0.032 inch.
30. The preform of claim 24, the average radial stretch ratio to produce the container being less than approximately 4.5:1.
31. The preform of claim 24, the average radial stretch ratio to produce the container being between approximately 1.5:1 and 4.5:1.
32. The preform of claim 24, the preform comprising at least 90%
polypropylene.
33. An injection molded preform for stretch blow molding a container comprising polypropylene, the preform defining a longitudinal axis anti comprising a finish having a support flange, and a preform blow section comprising a neck extending from the support flange, a sidewall extending from the neck and a base closing the blow section, the base having a portion of increased thickness defining a thickness greater than all other portions of the blow section, a lower end of the sidewall and the base are directed inward toward the preform longitudinal axis.
34. The preform of claim 32, the base portion thinning from the base portion of increased thickness to the preform longitudinal axis.
35. The preform of claim 32, the sidewall increasing in thickness from the neck to the base.
36. The preform of claim 32, comprising an intermediate barrier layer.
37. The preform of claim 32, the preform comprising at least 90%
polypropylene.
38. An injection molded preform for stretch blow molding a container comprising polypropylene, and having a finish, a neck extending from the finish, a sidewall extending from the neck and a base extending from the sidewall, the preform comprising a finish having a support flange, and a preform blow section having a neck extending from the support flange, a sidewall extending from the neck and a base closing the blow section, the preform facilitating an average radial stretch ratio of less than approximately 4.5:1 to produce the container.
39. The preform of claim 36, the average radial stretch ratio to produce the container being between approximately 1.5:1 and 4.5:1.
40. The preform of claim 36, the preform comprising at least 90%
polypropylene.
41. The preform of claim 36, the axial stretch ratio to produce the container being less than approximately 1.6:1.
42. The method of reheating a preform for stretch blow molding the preform defining a longitudinal axis and comprising a finish and a preform blow section comprising a neck extending from the finish, a sidewall extending from the neck and a base closing the blow section, the base having a portion of increased thickness defining a thickness greater than all other portions of the blow section, the method of repeating comprising exposing the preform blow portion to a plurality of repeat bulbs to elevate the temperature of the preform blow portion, an outer skin of the preform base portion of increased thickness being exposed to heating rays by substantially by only one bulb.
43. The method of claim 40, the heating rays being infrared heating rays.
44. The method of claim 40, the preform comprising polypropylene.
45. The method of claim 42, the preform comprising at least 90% polypropylene.
46. A stretch blow molding stretchrod comprising an elongated rod and a tip fixed to the end of the elongated rod, the tip defining a backside and an arcuate stretching surface for engaging a preform, the backside comprising a surface variation to increase the surface area of the tip backside.
47. The stretchrod of claim 44, the surface variation comprising a hole defined by the tip backside.
48. The stretchrod of claim 44, the surface variation comprising a groove defined by the tip backside.
49. The stretchrod of claim 44, the surface variation comprising a fin extending from the tip backside.
50. The stretchrod of claim 44, the tip being annular about a longitudinal axis.
CA 2464434 2001-10-24 2002-10-23 Polypropylene container and process for making it Expired - Fee Related CA2464434C (en)

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