CA2525551A1 - Longitudinal shrink films - Google Patents

Longitudinal shrink films Download PDF

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Publication number
CA2525551A1
CA2525551A1 CA002525551A CA2525551A CA2525551A1 CA 2525551 A1 CA2525551 A1 CA 2525551A1 CA 002525551 A CA002525551 A CA 002525551A CA 2525551 A CA2525551 A CA 2525551A CA 2525551 A1 CA2525551 A1 CA 2525551A1
Authority
CA
Canada
Prior art keywords
film
polystyrene
viscosity value
polymer blend
heat
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
CA002525551A
Other languages
French (fr)
Other versions
CA2525551C (en
Inventor
Denis Leon Vynckier
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.)
Plastic Suppliers Inc
Original Assignee
Plastic Suppliers, Inc.
Denis Leon Vynckier
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 Plastic Suppliers, Inc., Denis Leon Vynckier filed Critical Plastic Suppliers, Inc.
Publication of CA2525551A1 publication Critical patent/CA2525551A1/en
Application granted granted Critical
Publication of CA2525551C publication Critical patent/CA2525551C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • 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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/003—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor characterised by the choice of material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • 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
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0088—Blends of polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • 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.]
    • Y10T428/1328—Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, 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]

Abstract

A heat-shrinkable film and a method of its manufacture are provided. In an exemplary embodiment, a polystyrene film exhibits heat-induced growth in the cross direction of great than or equal to 5% with greater than or equal to 30%
concomitant shrinkage in the machine direction. The films may comprise crystal polystyrene, high impact polystyrene, and/or elastomers. A method of manufacture is disclosed which includes a post~extrusion temperature conditioning step.

Claims (41)

1. A shrink film comprised of a polystyrene polymer blend which, upon exposure to heat, exhibits shrinkage in the length direction and controlled growth in the cross direction, thus allowing the film to exhibit reduced curling of its outer edges as the film shrinks upon exposure to heat.
2. The shrink film of claim 1 in which the film exhibits shrinkage in the length direction in the range of about 10% to about 90% and exhibits a shrinkage in the cross direction in the range of about 30% to about -30% (a negative value indicates growth) When subjected to heat in a hot air oven at 120 °C after about five minutes.
3. The shrink film of claim 2 in which the film exhibits shrinkage in the length direction of about 50% and exhibits a shrinkage in the cross direction of about -10% (a negative value indicates growth) when subjected to heat in a hot air oven at 120 °C
after about five minutes.
4. The shrink film of claim 2 in which the film exhibits shrinkage in the length direction of about 30% and exhibits a shrinkage in the cross direction of about -5% (a negative value indicates growth) when subjected to heat in a hot air oven at 120 °C
after about five minutes.
5. The shrink film of claim 2 in which the film exhibits shrinkage in the length direction of up to about 50% or greater and exhibits a shrinkage in the cross direction of up to about -10% (a negative value indicates growth) when subjected to heat in a hot air oven over a temperature range of about 220°F to about 250 °F after about five minutes.
6. The shrink film of claim 1 in which the polystyrene polymer blend includes crystal polystyrene and elastomers.
7. The shrink film of claim 1 in which the polystyrene polymer blend includes high impact polystyrene and elastomers.
8. The shrink film of claim 1 in which the polystyrene polymer blend includes crystal polystyrene, high impact polystyrene and elastomers.
9. The shrink film of claim 8 in which the polystyrene polymer blend includes 48 parts crystal polystyrene, 2 parts high impact polystyrene and 50 parts elastomers.
10. The shrink film of claim 8 in which the polystyrene polymer blend includes 33 parts crystal polystyrene, 2 parts high impact polystyrene and 65 parts elastomers.
11. The shrink film of claim 8 in which the polystyrene polymer blend includes 68 parts crystal polystyrene, 2 parts high impact polystyrene and 30 parts elastomers.
12. The shrink film of claim 8 in which the polystyrene polymer blend includes 58 parts crystal polystyrene, 2 parts high impact polystyrene and 40 parts elastomers.
13. A packaged good comprising a consumable item and a heat treated film wrapped around at least a portion of the consumable item, which heat treated film is obtained by exposing to heat a shrink film comprised of a polystyrene polymer blend which exhibits shrinkage in the length direction and controlled growth in the cross direction upon exposure to heat.
14. The packaged good of claim 13 in which the consumable item includes batteries, cans, bottles, disposable lighters, pens and decorative items.
15. The packaged good of claim 13 in which the consumable item is a battery.
16. The packaged good of claim 13 in which the heat treated film forms a perforated or non-perforated neck band around the consumable item.
17. The packaged good of claim 13 in which the heat treated film is clear, matte, translucent, or opaque.
18. The packaged good of claim 13 in which the heat treated film includes a packaging label.
19. The packaged good of claim 18 in which the packaging label is printed onto the film.
20. A method of making a shrink film comprising (a) providing pellets of a polystyrene polymer blend, (b) drying the pellets, (c) melting the pellets to form a molten mass at a first desired viscosity value or range of values, (d) increasing the viscosity of the molten mass to a second desired viscosity value or range of values, (e) stretching the resulting molten mass to form a film, and (f) annealing the resulting film.
21. The method of claim 20 in which the drying step is carried out in an air dryer.
22. The method of claim 20 in which the melting step is carried out at a temperature range of about 150 °C to about 300 °C.
23. The method of claim 22 in which the melting step is carried out at a temperature range of about 180 °C to about 270 °C.
24. The method of claim 23 in which the melting step is carried out as a temper store of about 200 °C.
25. The method of claim 20 in which the first viscosity value ranges from about 3,000 P to about 6,000 P at about 240 °C and an apparent shear rate of about 55 seconds-1.
26. The method of claim 25 in which the first viscosity value ranges from about 4,000 P to about 5,000 P at about 240 °C and about 55 seconds 1.
27. The method of claim 26 in which the first viscosity value is about 4,500 P
at about 240 °C
and about 55 seconds-1.
28. The method of claim 20 in which the second viscosity value ranges from about 16,000 P
to about 19,500 P at about 180 °C and an apparent shear rate of about 55 seconds-1.
29. The method of claim 28 in which the second viscosity value ranges from about 16,500 P
to about 18,000 P at about 180 °C and about 55 seconds-1.
30. The method of claim 29 in which the second viscosity value is about 17,500 P at about 180 °C and about 55 seconds-1.
31. The method of claim 20 in which the viscosity increasing step is carried out in a polymer cooling unit.
32. The method of claim 20 in which the stretching step orients the film.
33. The method of claim 32 in which the stretching step is carried out using a blown film orientation process.
34. The method of claim 20 in which the annealing step is carried out at a temperature ranging from about 25 °C to about 200 °C.
35. The method of claim 34 in which the annealing step is carried out at a temperature ranging from about 30 °C to about 175 °C.
36. The method of claim 35 in which the annealing step is carried out at a temperature ranging from about 50 °C to about 100 °C.
37. The method of claim 36 in which the annealing step temperature is about 90 °C.
38. A method of increasing the viscosity of a polystyrene polymer blend suitable for shrink films, comprising (a) providing pellets of a polystyrene polymer blend, (b) melting the pellets to form a molten mass at a first desired viscosity value or range of values, and (c) cooling the molten mass to a second desired viscosity value or range of values in a polymer cooling unit.
39. The method of claim 38 in which the second desired viscosity value falls in the range of about two times to about ten times the first desired viscosity value.
40. The method of claim 38 in which the second desired viscosity value falls in the range of about four times to about eight times the first desired viscosity value.
41. The method of claim 38 in which the second desired viscosity value falls about six times the first desired viscosity value.
CA2525551A 2003-02-06 2004-02-05 Longitudinal shrink films Expired - Fee Related CA2525551C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US44527203P 2003-02-06 2003-02-06
US60/445,272 2003-02-06
PCT/US2004/003200 WO2004072155A2 (en) 2003-02-06 2004-02-05 Longitudinal shrink films

Publications (2)

Publication Number Publication Date
CA2525551A1 true CA2525551A1 (en) 2004-08-26
CA2525551C CA2525551C (en) 2012-03-27

Family

ID=32869329

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2525551A Expired - Fee Related CA2525551C (en) 2003-02-06 2004-02-05 Longitudinal shrink films

Country Status (4)

Country Link
US (3) US6897260B2 (en)
EP (1) EP1644260A4 (en)
CA (1) CA2525551C (en)
WO (1) WO2004072155A2 (en)

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US8133558B2 (en) 2004-08-30 2012-03-13 Plastics Suppliers, Inc. Polylactic acid blown film and method of manufacturing same
US7846517B2 (en) * 2005-04-19 2010-12-07 Plastic Suppliers, Inc. Polylactic acid shrink films and methods of manufacturing same
EP1913079A1 (en) * 2005-07-28 2008-04-23 Dow Gloval Technologies Inc. Biaxially oriented polystyrene film containing small rubber particles and low rubber particle gel content
WO2007015245A2 (en) * 2005-08-04 2007-02-08 Polysack Plastic Industries Ltd Thermoplastic shrinkable polymeric film
WO2007058783A1 (en) * 2005-11-15 2007-05-24 Dow Global Technologies Inc. Oriented multi-layer shrink labels
ES2615341T3 (en) * 2005-11-21 2017-06-06 Plastic Suppliers, Inc. Methods of molding shrinkable films of polylactic acid
WO2008013542A2 (en) * 2006-07-27 2008-01-31 Dow Global Technologies Inc. Shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
WO2008024170A2 (en) * 2006-08-24 2008-02-28 Dow Global Technologies Inc. Window envelopes with scratch resistant window film patches
JP5286763B2 (en) * 2006-12-20 2013-09-11 東洋紡株式会社 Heat-shrinkable polystyrene film and method for producing the same
US8431198B2 (en) 2007-10-02 2013-04-30 Dow Global Technologies Inc. Multilayer coextruded shrink labels of oriented polystyrene film containing small rubber particles and low rubber particle gel content and block copolymers
US20100170618A1 (en) * 2008-06-09 2010-07-08 Keeney Sean M Cut-and-stack label made from shrink film and related methods
US20090301636A1 (en) * 2008-06-09 2009-12-10 Keeney Sean M Cut-and-stack label made from shrink film and related methods
US20090325440A1 (en) * 2008-06-30 2009-12-31 Thomas Oomman P Films and film laminates with relatively high machine direction modulus
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Also Published As

Publication number Publication date
WO2004072155A2 (en) 2004-08-26
EP1644260A4 (en) 2007-10-10
CA2525551C (en) 2012-03-27
US6897260B2 (en) 2005-05-24
US20050100698A1 (en) 2005-05-12
US7101935B2 (en) 2006-09-05
US20040242786A1 (en) 2004-12-02
WO2004072155A3 (en) 2004-11-25
US20050158492A1 (en) 2005-07-21
EP1644260A2 (en) 2006-04-12

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Effective date: 20150205