CA2458136A1 - Heat-shrinkable packaging - Google Patents
Heat-shrinkable packaging Download PDFInfo
- 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
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract 16
- 238000000034 method Methods 0.000 claims abstract 23
- 229920006257 Heat-shrinkable film Polymers 0.000 claims abstract 18
- 239000010410 layer Substances 0.000 claims 42
- 239000012793 heat-sealing layer Substances 0.000 claims 24
- 230000004888 barrier function Effects 0.000 claims 19
- 239000004698 Polyethylene Substances 0.000 claims 16
- 239000000203 mixture Substances 0.000 claims 16
- -1 polybutylene Polymers 0.000 claims 16
- 239000012792 core layer Substances 0.000 claims 15
- 229920001577 copolymer Polymers 0.000 claims 12
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims 12
- 229920000573 polyethylene Polymers 0.000 claims 12
- 229920001169 thermoplastic Polymers 0.000 claims 9
- 239000004416 thermosoftening plastic Substances 0.000 claims 9
- 239000000470 constituent Substances 0.000 claims 8
- 239000005038 ethylene vinyl acetate Substances 0.000 claims 8
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 claims 4
- 239000004952 Polyamide Substances 0.000 claims 4
- 229920001986 Vinylidene chloride-vinyl chloride copolymer Polymers 0.000 claims 4
- 238000001816 cooling Methods 0.000 claims 4
- 229920002647 polyamide Polymers 0.000 claims 4
- 229920001748 polybutylene Polymers 0.000 claims 4
- 229920006225 ethylene-methyl acrylate Polymers 0.000 claims 2
- 239000000155 melt Substances 0.000 claims 2
- 229920002239 polyacrylonitrile Polymers 0.000 claims 2
- 229920000642 polymer Polymers 0.000 claims 2
- 229920000098 polyolefin Polymers 0.000 claims 2
- 238000003303 reheating Methods 0.000 claims 2
- 210000000988 bone and bone Anatomy 0.000 claims 1
- 238000007789 sealing Methods 0.000 claims 1
Classifications
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/002—Packages 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)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Making Paper Articles (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.
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.
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.
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.
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.
(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.
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.
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.
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.
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.
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.
(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.
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.
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.
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.
(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.
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.
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.
(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.
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) |
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| JP4937754B2 (en) * | 2004-10-04 | 2012-05-23 | キョーラク株式会社 | Filled package and manufacturing method thereof |
| 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 |
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-
2004
- 2004-02-19 IL IL160470A patent/IL160470A/en not_active IP Right Cessation
- 2004-02-19 CA CA2458136A patent/CA2458136C/en not_active Expired - Fee Related
- 2004-02-20 BR BR0402590-3A patent/BRPI0402590A/en not_active IP Right Cessation
- 2004-02-20 NZ NZ531295A patent/NZ531295A/en not_active IP Right Cessation
- 2004-02-20 PL PL04365437A patent/PL365437A1/en unknown
- 2004-02-20 EP EP04250922.4A patent/EP1449787B2/en not_active Expired - Lifetime
- 2004-02-20 JP JP2004044321A patent/JP4750367B2/en not_active Expired - Fee Related
- 2004-02-20 NO NO20040765A patent/NO20040765L/en not_active Application Discontinuation
- 2004-02-25 AU AU2004200759A patent/AU2004200759B2/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| JP4750367B2 (en) | 2011-08-17 |
| BRPI0402590A (en) | 2004-11-30 |
| IL160470A0 (en) | 2004-07-25 |
| AU2004200759A1 (en) | 2004-09-09 |
| NO20040765L (en) | 2004-08-23 |
| EP1449787B1 (en) | 2009-05-06 |
| IL160470A (en) | 2010-05-17 |
| JP2004269053A (en) | 2004-09-30 |
| AU2004200759B2 (en) | 2009-11-05 |
| EP1449787B2 (en) | 2015-03-04 |
| NZ531295A (en) | 2005-11-25 |
| EP1449787A1 (en) | 2004-08-25 |
| PL365437A1 (en) | 2004-08-23 |
| CA2458136C (en) | 2012-01-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20170220 |