CA2458136A1 - Heat-shrinkable packaging - Google Patents

Heat-shrinkable packaging Download PDF

Info

Publication number
CA2458136A1
CA2458136A1 CA002458136A CA2458136A CA2458136A1 CA 2458136 A1 CA2458136 A1 CA 2458136A1 CA 002458136 A CA002458136 A CA 002458136A CA 2458136 A CA2458136 A CA 2458136A CA 2458136 A1 CA2458136 A1 CA 2458136A1
Authority
CA
Canada
Prior art keywords
seal
film
bag
tube
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
CA002458136A
Other languages
French (fr)
Other versions
CA2458136C (en
Inventor
Gregory Robert Pockat
Thomas Andrew Schell
David A. Busche
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.)
Bemis Co Inc
Original Assignee
Curwood Inc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=32737997&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CA2458136(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from US10/371,950 external-priority patent/US20040166261A1/en
Application filed by Curwood Inc filed Critical Curwood Inc
Publication of CA2458136A1 publication Critical patent/CA2458136A1/en
Application granted granted Critical
Publication of CA2458136C publication Critical patent/CA2458136C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • 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
    • B65D75/00Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
    • B65D75/002Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers in shrink films

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Laminated Bodies (AREA)
  • Making Paper Articles (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

An individual end-sealed packaging receptacle, such as a bag, formed from a sheet of heat-shrinkable film having a first edge and an opposing second edge. The packaging receptacle includes a first seal bonding the first edge and second edge to define a tube member having a first bag wall, a second bag wall, first and second opposing lay-flat bag edges, an end and an open mouth.
The packaging receptacle includes a second seal through the first and second bag walls, extending laterally across the width of both the first and second walls and thereby closing the end.
Preferably, at least one of the first and second seals is a peelable seal. The first seal may be a lap seal, a fin seal, a butt-seal or a seal strip. A method of forming a individual, end-sealed, heat-shrinkable packaging receptacle is also disclosed.

Claims (105)

1. An individual end-sealed packaging receptacle formed from a sheet of a heat-shrinkable film, said film having a first edge and an opposing second edge, said receptacle comprising:

a first seal bonding said first edge and said second edge thereby defining a tube member having a first tube wall, a second tube wall, opposing first and second lay-flat edges, an end and an open mouth, said first seal being positioned between said first and second lay-flat edges;

a second seal provided through said first and second tube walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end, whereby an empty product receiving chamber is def ned by said first wall, said second wall, said second seal and said open mouth.
2. A receptacle according to claim 1, wherein said first seal comprises a fin seal, a lap seal or a butt-seal.
3. A receptacle according to claim 1 or 2, wherein said film has a thickness from about 1.5 mil to about 4.0 mil.
4. A receptacle according to any preceding claim, wherein said film comprises a biaxially stretched film having a shrinkage value of at least 30 % shrink at 90°C in at least one direction.
5. A receptacle according to claim 4, wherein said shrinkage value is in the machine direction.
6. A receptacle according to claim 4 or 5, wherein said biaxially stretched film comprises a multilayer film having an inner layer, a core layer and an outer layer.
7. A receptacle according to claim 6, wherein said core layer comprises a polymer selected from the group consisting of vinylidene chloride copolymer, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer, polyamide and blends thereof.
8. A receptacle according to any preceding claim, wherein said film comprises a seven-layer film.
9. A receptacle according to claim 8, wherein said seven-layer film comprises an inner layer/a second layer/a first tie layer/a barrier layer/a second tie layer/a third layer/an outer layer structure.
10. A receptacle according to claim 9, wherein said barrier layer comprises a polymer selected from the group consisting of vinylidene chloride copolymer, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-methyl acrylate copolymer, ethylene-vinyl alcohol copolymer, polyamide and blends thereof.
11. A receptacle according to claim 9 or 10, wherein said first tie layer comprises an ethylene-methyl acrylate copolymer.
12. A receptacle according to any of claims 9, 10 or 11, wherein said second tie layer comprises an ethylene-methyl acrylate copolymer.
13. A receptacle according to any of claims 9 to 12, wherein said inner layer comprises a polyolefin having a Melt Index of at least 7.0 g/10 min.
14. A receptacle according to any of claims 9 to 13, wherein said outer layer comprises a polyolefin having a Melt Index of at least 16.0 g/10 min.
15. A receptacle according to any preceding claim, wherein said receptacle includes indicia thereon.
16. A receptacle according to claim 15, wherein said indicia is printed.
17. An end-sealed packaging receptacle formed from a sheet of a heat-shrinkable film, said film having a first edge and an opposing second edge, said receptacle comprising:

a first seal bonding said first edge and said second edge and defining a tube member having a first tube wall, a second tube wall, opposing first and second lay-flat edges, a closed end and an open mouth, said first seal comprising a lap seal;

a second seal provided through said first and second walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end, whereby a product receiving chamber is defined by said first wall, said second wall, said second seal and said open mouth.
18. An end-sealed packaging receptacle formed from a sheet of a heat-shrinkable film, said film having a first edge and an opposing second edge, said receptacle comprising:

a first seal bonding said first edge and said second edge and defining a tube member having a first tube wall, a second tube wall, opposing first and second lay-flat edges, a closed end and an open mouth, said first seal comprising a butt-seal;

a second seal provided through said first and second walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end, whereby a product receiving chamber is defined by said first wall, said second wall, said second seal and said open mouth.
19. A method of forming an individual, end-sealed, heat-shrinkable packaging receptacle from a flat sheet of film, said method comprising the steps of (1) providing a heat-shrinkable thermoplastic film having a first edge and an opposed second edge;

(2) bringing said first and second edges together;

(3) forming a first seal joining said first and second edges to form a tube member having a first tube wall, a second tube wall, a bottom and an open mouth; and, (4) providing a second seal through said first and second tube walls, said second seal extending laterally across said tube member at a position approximate said bottom.
20. A method according to claim 19, wherein said heat-shrinkable thermoplastic film includes an indicia.
21. A method according to claim 19 or 20, wherein said first seal comprises a lap seal, a butt-seal or a fin seal.
22. A method according to any of claims 19 to 21, wherein said flat sheet of film is slit to a desired width prior to bringing said first and second edges together.
23. A method according to any of claims 19 to 22, wherein said heat-shrinkable thermoplastic film has a shrinkage value of at least 30 % at 90°C in at Least one direction.
24. A method according to any of claims 19 to 23, wherein said method further includes the step of providing a cut laterally through said tube member, said cut extending laterally across at least the width of both first and second tube walls to separate said receptacle from said continuous roll of flat sheet film.
25. A method according to claim 24, wherein said cut is provided prior to providing said second seal.
26. A method according to any of claims 19 to 25, wherein said heat-shrinkable thermoplastic film is formed by coextruding a primary film tube, cooling the primary film tube, collapsing the primary film tube, inflating the primary tube, reheating the inflated primary film tube, biaxially stretching the primary film tube, cooling the primary film tube, recollapsing the primary film tube and slitting the primary film tube to produce a sheet of film.
27. A method according to any of claims 19 to 26, wherein said first seal is linear.
28. A method according to any of claims 19 to 27, wherein said second seal and said cut are curved.
29. A method according to any of claims 19 to 28, wherein said first seal has a seal strength of at least 8,000 g.
30. A method of forming a heat-shrinkable bag comprising the steps of:

1. coextruding a primary film tube;

2. biaxially stretching said film tube to provide a heat-shrinkable film tube stock;

3. slitting said tube stock to form a continuous sheet of film;

4. slitting said continuous flat sheet of film longitudinally to form a desired-width bag film; said desired-width bag film having a first edge and an opposing second edge;

5. sealing said first and second edges to form a tube member having a first wall, a second wall and a product receiving chamber defined between said first and second walls;

6. providing a first lateral seal through said first and second walls, said seal extending laterally across the width of said tube member; and 7. providing a cut through said tube member, said cut extending laterally across the width of said tube member, whereby a bag is formed having a bag mouth on one end formed by said cut and having said first lateral seal proximate a bag end at an opposing end from said bag mouth.
31. A method according to claim 30, wherein said continuous sheet of film is wound onto a roll prior to being slit to form said desired-width bag film.
32. A tubular film for producing end-sealed packaging receptacles, said tubular film formed from a sheet of a heat-shrinkable film, said film having a first edge and an opposing second edge, said tubular film comprising:

a first seal longitudinally joining said first edge and said second edge and defining a tube member having a first tube wall, a second tube wall and opposing first and second lay-flat edges;
said first seal selected from the group consisting of a lap seal, a butt-seal and a fin seal, wherein said tube member has a lay-flat width of greater than or equal to 22 inches.
33. A tubular film for producing end-sealed packaging receptacles, said tubular film formed from a sheet of a heat-shrinkable film, said film having a first edge and an opposing second edge, said tubular film comprising:

a first seal longitudinally joining said first edge and said second edge and defining a tube member having a first tube wall, a second tube wall and opposing first and second lay-flat edges;
said first seal selected from the group consisting of a lap seal, a butt-seal and a fin seal, wherein said tube member includes an indicia thereon.
34. A tubular film according to claim 33, wherein said indica indicates a bone-containing product is contained therein.
35. A tubular film for producing end-sealed packaging receptacles, said tubular film formed from a sheet of a heat-shrinkable film, said film having a first edge and an opposing second edge, said tubular film comprising:

a first seal longitudinally joining said first edge and said second edge and defining a tube member having a first tube wall, a second tube wall and opposing first and second lay-flat edges;
said first seal selected from the group consisting of a lap seal, a butt-seal and a fin seal, wherein said tube member has a lay-flat width of greater than or equal to 22 inches and said tube member includes an indicia thereon.
36. A tubular film according to any of claims 32 to 35, wherein said film has a thickness from about 1.5 mil to about 4.0 mil.
37. A tubular film according to any of claims 32 to 36, wherein said film comprises a biaxially stretched film having a shrinkage value of at least 20 % shrink at 90°C in at least one direction.
38. An individual, end-sealed packaging bag formed from a sheet of a heat-shrinkable film, said sheet of a heat-shrinkable film having a first side, an opposing second side, an inner surface and an outer surface, said bag comprising:
a first seal connecting said first side to said second side and defining a tube member having a first bag wall, a second bag wall, opposing first and second bag edges, an end and an open mouth opposite said end;
a second seal provided through said first and second bag walls, said second seal extending laterally across the width of both said first and second bag walls at a position proximate said end, whereby an empty product receiving chamber is defined by said first bag wall, said second bag wall, said second seal and said open mouth; and, wherein at least one of said first and second seals comprising a peelable seal.
39. A bag according to claim 38, wherein said first seal is selected from the group consisting of a lap seal, a fin seal, a butt-seal and a seal strip and said first seal comprises a peelable seal.
40. A bag according to claim 38 or 39, wherein said first seal comprises a butt-seal, said butt-seal including a butt-seal tape having a first border and a second border, a first heat seal joining said first border to said first side, and a second heat seal joining said second border to said second side.
41. A bag according to claim 40, wherein said butt-seal tape includes a pull flap.
42. A bag according to claim 40 or 41, wherein said first border is heat sealed to the inner surface of said first side and said second border is heat sealed to the inner surface of said second side.
43. A bag according to claims 40, 41 or 42, wherein at least one of said first and second sides extends outwardly to form a pull flap.
44. A bag according to any of claims 40 to 43, wherein said butt-seal tape comprises a butt-seal film including a peelable system.
45. A bag according to any of claims 38 to 44, wherein said first and second heat seals are peelable.
46. A bag according to any of claims 38 to 45, wherein said sheet of heat-shrinkable film includes a peelable system.
47. A bag according to any of claims 38 to 46, wherein said first seal includes a seal strip, said seal strip comprising a strip film having a first margin, a second margin, an inside surface and an outward surface; a first heat seal joining said outward surface of said first margin to said inner surface of said first side; and a second heat seal joining said inside surface of said strip film to said outer surface of said second side.
48. A bag according to claim 47, wherein said second heat seal is a peelable seal.
49. A bag according to claim 47 or 48, wherein said first heat seal is a peelable seal.
50. A bag according to any of claims 47 to 49, wherein said strip film comprises a peelable system.
51. A bag according to any of claims 47 to 50, wherein said strip film includes a pull flap.
52. A bag according to any of claims 40 to 51, wherein said sheet of heat-shrinkable film includes a peelable system.
53. A bag according to any of claims 40 to 52, wherein said film comprises a multilayer barrier film.
54. A bag according to claim 53, wherein said multilayer barrier film comprises:
(a) an inner heat sealing layer;
(b) a barrier layer;
(c) a core layer;
(d) a tie layer; and, (e) an outer heat sealing layer.
55. A bag according to claim 54, wherein said outer heat sealing layer forms the outer surface of said bag.
56. A bag according to claim 54 or 55, wherein said tie layer is permanently bonded to said core layer and peelably bonded to said outer heat sealing layer.
57. A bag according to claim 54 or 55, wherein said tie layer is permanently bonded to said outer heat sealing layer and peelably bonded to said core layer.
58. A bag according to any of claims 54 to 57, wherein said tie layer comprises a blend of polybutylene and at least one other constituent.
59. A bag according to claim 58, wherein said at least one other constituent comprises polyethylene.
60. A bag according to any of claims 54 to 59, wherein said outer heat sealing layer comprises polyethylene.
61. A bag according to any of claims 54 to 60, wherein said core layer comprises a blend of polyethylene and an ethylene-vinyl acetate copolymer.
62. A bag according to any of claims 54 to 61, wherein said barrier layer is selected from the group consisting of vinylidene chloride copolymers, ethylene vinyl alcohol copolymers, polyacrylonitriles and polyamides.
63. A bag according to claim 62, wherein said barrier layer comprises a vinylidene chloride copolymer.
64. A bag according to any of claims 54 to 63, wherein said inner heat sealing layer comprises a blend of polyethylene and ethylene-vinyl acetate copolymer.
65. A bag according to any of claims 54 to 64, wherein said tie layer comprises a blend of polybutylene and at least one other constituent; said outer heat sealing layer comprises polyethylene; said core layer comprises a blend of polyethylene and an ethylene-vinyl acetate copolymer; said barrier layer comprises a vinylidene chloride copolymer; and said inner heat sealing layer comprises a blend of polyethylene and ethylene-vinyl acetate copolymer.
66. A bag according to claim 65, wherein said at least one other constituent comprises polyethylene and said barrier layer comprises a blend of vinylidene chloride-methyl acrylate copolymer and vinylidene chloride-vinyl chloride copolymer.
67. A bag according to claim any of claims 54 to 66, wherein said inner heat sealing layer comprises from about 0 to about 50%, said barrier layer comprises about 0 to about 20%;
said core layer comprises about 0 to about 28%; said tie layer comprises about 0 to about 15%;
and said outer heat sealing layer comprises about 0 to about 15%, based on the total thickness of said film.
68. A bag according to any of claim 38 to 67, wherein said first seal is peelable and has a seal strength of less than 2 kilograms for a one inch strip.
69 69. A bag according to any of claims 38 to 68, wherein said first seal is peelable and has a seal strength of less than 1.5 kilograms for a one inch strip.
70. A bag according to any of claims 38 to 69, wherein said second seal is peelable and has a seal strength of about 500 to about 1000 grams for a one inch strip.
71. A bag according to any of claims 38 to 70, wherein said second seal is nonpeelable.
72. A bag according to any of claims 38 to 71, wherein said sheet of heat-shrinkable film has a thickness from about 1.25 mil to about 8.0 mil.
73. A bag according to any of claims 38 to 72, wherein said sheet of heat-shrinkable film has a thickness from about 1.75 mil to about 3.0 mil.
74. A bag according to any of claims 38 to 73, wherein said sheet of heat-shrinkable film comprises a biaxially stretched film having a shrinkage value of at least 20%
shrink at 90°C in at least one direction.
75. A bag according to claim 74, wherein said shrinkage value is in the machine direction.
76. A bag according to claim 74, wherein said shrinkage value is in the transverse direction.
77. A bag according to claim 74, wherein said shrinkage value is in both the machine direction and the transverse direction.
78. A bag according to any of claims 54 to 77, wherein said first seal comprises a lap seal and said inner heat sealing layer forms the inside surface of the bag.
79. A bag according to any of claims 38 to 78, wherein said first seal comprises a lap seal and said first side includes an unsealed portion extending outwardly beyond said first seal.
80. An end-sealed packaging bag formed from a sheet of a heat-shrinkable film, said film having a first side and an opposing second side, said bag comprising:
a first seal bonding said first side and said second side along the lengths thereof thereby defining a tube member having a first bag wall, a second bag wall, opposing first and second bag edges, an end and an open mouth, said first seal comprising a lap seal and being peelable;
a second seal provided through said first and second walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end;
and, a product receiving chamber defined by said first wall, said second wall, said second seal and said open mouth.
81. A method of forming an end-sealed, heat-shrinkable packaging bag having at least one peelable seal from a flat sheet of film comprising:
(5) providing a sheet of heat-shrinkable thermoplastic film having a first side and an opposed second side;
(6) providing a first seal between said first and second sides to form a tube member, said tube member having a first bag wall, a second bag wall, a bottom and an open mouth;
and, (7) providing a second seal through said first and second bag walls, said second seal extending laterally across said tube member at a position approximate said bottom;
wherein at least one of said first and second seals comprise a peelable seal.
82. A method according to claim 81, wherein said sheet of heat-shrinkable thermoplastic film is slit to a desired width prior to bringing said first and second sides together.
83. A method according to claim 81 or 82, wherein said sheet of heat-shrinkable thermoplastic film has a shrinkage value of at least 20% at 90°C in at least one direction.
84. A method according to any of claims 81 to 83 wherein said sheet of heat-shrinkable thermoplastic film comprises a continuous roll of film sheet and said method further includes (f) providing a cut laterally through said tube member, said cut extending laterally across at least the width of both said first and second bag walls thereby separating a portion of said tube member including said second seal from said tube member.
85. A method according to any of claims 81 to 84, wherein said heat-shrinkable thermoplastic film is formed by coextruding a primary film tube, cooling the primary film tube, collapsing the primary film tube, inflating the primary tube, reheating the inflated primary film tube, biaxially stretching the primary film tube, cooling and recollapsing the primary film tube, slitting the primary film tube longitudinally and laying open the slit primary tube to produce a flat sheet of biaxially oriented film.
86. A method of forming a heat-shrinkable bag comprising the steps of:
coextruding a primary film tube;
2. biaxially stretching said film tube to provide a heat-shrinkable film tube stock;
3. slitting said tube stock to form a continuous flat sheet of film;
4. slitting said continuous flat sheet of film longitudinally to form a desired-width bag film; said desired-width bag film having a first side and an opposing second side;

5. providing a first seal between said first and second sides to form a tube member having a first bag wall, a second bag wall and a product receiving chamber defined between said first and second bag walls, said first seal comprising a peelable seal;

6. providing a second seal between said first and second walls, said second seal extending laterally across the width of said tube member and being a permanent seal; and 7. providing a cut through said tube member, said cut extending laterally across the width of said tube member and separating a portion of said tube member containing said lateral seal from said tube member.
87. An end-sealed packaging bag formed from a sheet of a heat-shrinkable film, said film having a first side, an opposing second side, an inner surface and an outer surface, said bag comprising:
a first seal joining said first side and said second side along the lengths thereof and defining a tube member having a first bag wall, a second bag wall, opposing first and second bag edges, an end and an open mouth, said first seal comprising a lap seal and being peelable;
a second seal provided through said first and second walls, said second seal extending laterally across the width of both said first and second walls at a position approximate said end;
and, a product receiving chamber defined by said first wall, said second wall, said second seal and said open mouth.
88. A bag according to claim 87, wherein said film comprises a multilayer barrier film.
89. A bag according to claim 87 or 88, wherein said film comprises a multilayer barrier film comprising:
(a) an inner heat sealing layer;
(b) a barrier layer adjacent said inner heat sealing layer;
(c) a core layer adjacent said barrier layer;
(d) a tie layer adjacent said core layer; and, (e) an outer heat sealing layer adjacent said tie layer.
90. A bag according to claim 89, wherein said tie layer comprises a blend of polybutylene and at least one other constituent.
91. A bag according to claim 90, wherein said at least one other constituent comprises polyethylene.
92. A bag according to any of claims 89 to 91, wherein said outer heat sealing layer comprises polyethylene.
93. A bag according to any of claims 89 to 92, wherein said core layer comprises a blend of polyethylene and an ethylene-vinyl acetate copolymer.
94. A bag according to any of claims 89 to 93, wherein said barrier layer is selected from the group consisting of vinylidene chloride copolymers, ethylene vinyl alcohol copolymers, polyacrylonitriles and polyamides.
95. A bag according to any of claims 89 to 94, wherein said barrier layer comprises a vinylidene chloride copolymer.
96. A bag according to any of claims 89 to 95, wherein said inner heat sealing layer comprises a blend of polyethylene and ethylene-vinyl acetate copolymer.
97. A bag according to any of claims 89 to 96, wherein said tie layer comprises a blend of polybutylene and at least one other constituent; said outer heat sealing layer comprises polyethylene; said core layer comprises a blend of polyethylene and an ethylene-vinyl acetate copolymer; said barrier layer comprises a vinylidene chloride copolymer; and said inner heat sealing layer comprises a blend of polyethylene and ethylene-vinyl acetate copolymer.
98. A bag according to claim 97, wherein said at least one other constituent comprises polyethylene and said barrier layer comprises a blend of vinylidene chloride-methyl acrylate copolymer and vinylidene chloride-vinyl chloride copolymer.
99. A bag according to any of claims 89 to 98, wherein said inner heat sealing layer comprises from about 0 to about 50 %, said barrier layer comprises about 0 to about 20%; said core layer comprises about 0 to about 28%; said tie layer comprises about 0 to about 15%; and said outer heat sealing layer comprises about 0 to about 15%, based on the total thickness of said film
100. A bag according to any of claims 87 to 99, wherein said first seal has a seal strength of greater than 3 kilograms per inch.
101. A bag according to any of claims 87 to 100, wherein said first seal has a seal strength of greater than 6 kilograms per inch.
102. A bag according to any of claims 87 to 101, wherein said second seal has a seal strength of greater than 3 kilograms per inch.
103. A bag according to any of claims 89 to 102, wherein said outer heat sealing layer forms the outer surface of said bag.
104. A bag according to any of claims 89 to 103, wherein said tie layer is permanently bonded to said core layer and peelably bonded to said outer heat sealing layer.
105. A bag according to any of claims 89 to 104, wherein said tie layer is permanently bonded to said outer heat sealing layer and peelably bonded to said core layer.
CA2458136A 2003-02-20 2004-02-19 Heat-shrinkable packaging Expired - Fee Related CA2458136C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US10/371,950 US20040166261A1 (en) 2003-02-20 2003-02-20 Heat-shrinkable packaging receptacle
US10/371,950 2003-02-20
US10/645,186 US7527839B2 (en) 2003-02-20 2003-08-21 Easy open heat-shrinkable packaging
US10/645,186 2003-08-21

Publications (2)

Publication Number Publication Date
CA2458136A1 true CA2458136A1 (en) 2004-08-20
CA2458136C CA2458136C (en) 2012-01-03

Family

ID=32737997

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2458136A Expired - Fee Related CA2458136C (en) 2003-02-20 2004-02-19 Heat-shrinkable packaging

Country Status (9)

Country Link
EP (1) EP1449787B2 (en)
JP (1) JP4750367B2 (en)
AU (1) AU2004200759B2 (en)
BR (1) BRPI0402590A (en)
CA (1) CA2458136C (en)
IL (1) IL160470A (en)
NO (1) NO20040765L (en)
NZ (1) NZ531295A (en)
PL (1) PL365437A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006038700A1 (en) * 2004-10-04 2006-04-13 Kyoraku Co., Ltd. Filling-packaging body
US7279206B2 (en) * 2005-03-22 2007-10-09 Curwood, Inc. Packaging laminates and articles made therefrom
US20080274239A1 (en) 2007-05-01 2008-11-06 Kraft Foods Holdings, Inc. Ingredient Package and Method
JP5957807B2 (en) * 2011-05-26 2016-07-27 キョーラク株式会社 Packaging bag
DE102014008957A1 (en) * 2014-06-23 2015-12-24 Tesseraux Spezialverpackungen Gmbh Round bottom bag, method for producing a round bottom packaging and hotmelt adhesive package
JP6627378B2 (en) * 2015-09-30 2020-01-08 凸版印刷株式会社 Packaging bag
TW201723001A (en) * 2015-12-16 2017-07-01 陶氏全球科技有限責任公司 Package with peelable and non-peelable heat seals
CN113650275A (en) * 2021-07-28 2021-11-16 佛山市弘禾新材料科技有限公司 Preparation device and preparation method of antibacterial waterproof fresh-keeping bag

Family Cites Families (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1154760B (en) * 1959-03-04 1963-09-19 Albert A Vail Packaging for food and food products or the like.
US3456044A (en) 1965-03-12 1969-07-15 Heinz Erich Pahlke Biaxial orientation
US3655503A (en) 1969-01-13 1972-04-11 Crown Zellerbach Corp Package of composite film with peelable, heatsealable surfaces
US4058632A (en) 1974-12-16 1977-11-15 Koninklijke Emballage Industrie Van Leer B.V. Light-weight, flexible, easy-open, impermeable package system
US4252846A (en) 1975-09-22 1981-02-24 The Dow Chemical Company Packages embodying a controlled peel seal and method of preparing same
US4189519A (en) 1978-08-30 1980-02-19 American Can Company Heat sealable resin blends
US4550141A (en) 1983-08-22 1985-10-29 E. I. Du Pont De Nemours And Company Blends of ionomer with propylene copolymer
US4615926A (en) 1984-07-20 1986-10-07 American Can Company Film and package having strong seals and a modified ply-separation opening
US4666778A (en) 1984-08-31 1987-05-19 Shell Oil Company Packaging film and sheet capable of forming peelable seals with good optics
US4737391A (en) 1984-12-03 1988-04-12 Viskase Corporation Irradiated multilayer film for primal meat packaging
US4875587A (en) 1985-02-21 1989-10-24 W. R. Grace & Co.-Conn. Easy open shrinkable laminate
CA1340037C (en) 1985-06-17 1998-09-08 Stanley Lustig Puncture resistant, heat-shrinkable films containing very low density polyethylene copolymer
US5128414A (en) 1985-06-28 1992-07-07 Shell Oil Company Polymer packaging film and sheet capable of forming peelable seals made from ethylenic and butene-1 polymers
US4937139A (en) 1987-04-30 1990-06-26 American National Can Company Peelable packaging and sheet materials and compositions for use therein
US4784885A (en) 1986-08-29 1988-11-15 R. J. Reynolds Tobacco Company Peelable film laminate
US4916190A (en) 1987-05-15 1990-04-10 Shell Oil Company Film and sheet capable of forming retortable and easy-open packagings
US4798751A (en) 1987-05-28 1989-01-17 Viskase Corporation Heat shrinkable multilayer film for primal meat packaging
JPH0784222B2 (en) * 1987-10-30 1995-09-13 出光石油化学株式会社 Multi-layer packaging bag
US4944409A (en) * 1988-02-10 1990-07-31 Curwood, Inc. Easy open package
US4882229A (en) 1988-04-29 1989-11-21 Shell Oil Company Blends of high molecular weight polybutylene with low density polyethylene
US5547752A (en) 1988-06-20 1996-08-20 James River Paper Company, Inc. Blend of polybutylene and ionomer forming easy-open heatseal
US5079051A (en) * 1989-12-08 1992-01-07 W. R. Grace & Co.-Conn. High shrink energy/high modulus thermoplastic multi-layer packaging film and bags made therefrom
US5023121A (en) 1990-04-12 1991-06-11 W. R. Grace & Co.-Conn. Coextruded film with peelable sealant
US6221410B1 (en) * 1992-09-25 2001-04-24 Cryovac, Inc. Backseamed casing and packaged product incorporating same
US5302402A (en) 1992-11-20 1994-04-12 Viskase Corporation Bone-in food packaging article
BR9405336A (en) 1993-04-09 1999-08-31 Viskase Corp Film, bag and packaging for cheese, and process for packaging food products that breathe and their process
DK170114B1 (en) 1993-05-05 1995-05-29 Raackmanns Fab As Bag packaging made of flexible packaging material and method of making it
DE19548789A1 (en) 1995-12-27 1997-07-03 Hoechst Trespaphan Gmbh Peelable, sealable polyolefinic multilayer film, process for its preparation and its use
US5759648A (en) 1996-07-05 1998-06-02 Viskase Corporation Multilayer plastic film, useful for packaging a cook-in foodstuff
US5888648A (en) 1996-09-12 1999-03-30 Mobil Oil Corporation Multi-layer hermetically sealable film and method of making same
US5928740A (en) 1997-02-28 1999-07-27 Viskase Corporation Thermoplastic C2 -α-olefin copolymer blends and films
US6015235A (en) 1997-03-07 2000-01-18 Curwood, Inc. Puncture-resistant barrier pouch
US6790468B1 (en) * 1997-09-30 2004-09-14 Cryovac, Inc. Patch bag and process of making same
ATE258206T1 (en) 1998-04-16 2004-02-15 Cryovac Inc TERNARY POLYMER MIXTURE AND FILM BASED THEREOF AND EASY-TO-OPEN PACKAGING MADE THEREFROM
US6355287B2 (en) * 1998-06-22 2002-03-12 Cryovac, Inc. Packaged food product having added liquid
US6004599A (en) 1998-08-10 1999-12-21 Viskase Corporation Bag for packaging bone-in cuts of meat
JP2000142724A (en) * 1998-11-09 2000-05-23 Toppan Printing Co Ltd Easily unsealable bag-shaped packaging body
US6224410B1 (en) * 2000-04-04 2001-05-01 Chuan-Ying Chen Structure of a copper head socket for a light bulb
JP5582669B2 (en) * 2000-08-22 2014-09-03 三井化学株式会社 SEALANT RESIN COMPOSITION, SEALANT FILM AND USE THEREOF
FR2841223B1 (en) * 2002-06-19 2004-10-15 Sleever Int PACKAGING FOR OBJECTS (S) OF HEAT SHRINKABLE MATERIAL WITH ESSENTIALLY SMOOTH INTERNAL OR EXTERNAL SIDE
US20090017239A1 (en) 2006-01-31 2009-01-15 Felice Ursino Hermetically Sealable, Easy-Opeanable, Flexible Container of Heat-Shrinklable Thermoplastic Material

Also Published As

Publication number Publication date
JP4750367B2 (en) 2011-08-17
NZ531295A (en) 2005-11-25
EP1449787B1 (en) 2009-05-06
EP1449787A1 (en) 2004-08-25
BRPI0402590A (en) 2004-11-30
CA2458136C (en) 2012-01-03
NO20040765L (en) 2004-08-23
IL160470A (en) 2010-05-17
AU2004200759B2 (en) 2009-11-05
PL365437A1 (en) 2004-08-23
AU2004200759A1 (en) 2004-09-09
JP2004269053A (en) 2004-09-30
IL160470A0 (en) 2004-07-25
EP1449787B2 (en) 2015-03-04

Similar Documents

Publication Publication Date Title
EP2075201B1 (en) Heat-shrinkable packaging
US5878549A (en) Packages with controlled easy-open features
EP0480605B1 (en) Easy open flexible containers
US20030231811A1 (en) Internally scored film, package and methods of making the same
US20040173492A1 (en) Reclosable packages and method for forming, filling and sealing such packages
EP1396436A1 (en) Failure-resistant receptacle and method of manufacture
CA1323336C (en) Draw tape bag with two single draw tapes and method of manufacture
CA2458136A1 (en) Heat-shrinkable packaging
JP2004269053A5 (en)
EP1541493A1 (en) Paired bags and method of making same
EP0957044B1 (en) Easy opening system for shrunk hermetic bags
JP4074083B2 (en) Gusset bag with chuck tape and method for manufacturing the same
US20140287172A1 (en) Patch Bag Having Separated Tear Initiators
JP4530404B2 (en) Zippered packaging material and package
JP3953786B2 (en) Gusset bag with chuck tape and method for manufacturing the same
JP7440737B2 (en) Film for bag making and filling, bag making and filling method
WO2020105710A1 (en) Form-fill-sealing film and form-fill-sealing method
CA2067416C (en) Perforated tear strip for easy-open flexible containers
JP2003137341A (en) Packaging bag from which content is easily taken out and packaged item made by using it
CA2183720A1 (en) Hermetically sealed package with heat-sealable tear strip and method of manufacture
MXPA96003529A (en) Hermetically sealed package, with thermosellable stripping strips and product method
JP2005153883A (en) Gusset bag with chuck tape
MXPA98001750A (en) Barrier bag resistant to perforac

Legal Events

Date Code Title Description
EEER Examination request
MKLA Lapsed

Effective date: 20170220