IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0001560
(2004-11-30)
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등록번호 |
US-7534479
(2009-07-01)
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발명자
/ 주소 |
- Utz, Martin
- Lengfeller, Karl
- Wilkes, Michael
- Venkatasanthanam, Sriram
- Heydarpour, Ramin
- Chu, Chia Hsi
- Ugolick, Ronald
- Mehrabi, Ali R.
|
출원인 / 주소 |
- Avery Dennison Corporation
|
인용정보 |
피인용 횟수 :
4 인용 특허 :
41 |
초록
▼
A card sheet including a top material having punched lines, the front side of the top material being printable. A carrier material of at least one polymer layer is directly applied as by extruding to the back side of the top material. The polymer has a stress-at-break in the range of 10 to 30 MPa an
A card sheet including a top material having punched lines, the front side of the top material being printable. A carrier material of at least one polymer layer is directly applied as by extruding to the back side of the top material. The polymer has a stress-at-break in the range of 10 to 30 MPa and an elongation at break in the range of 10 to 120%. From the card sheet individual cards may be broken out to form high quality calling (business) cards, photograph cards, post cards or the like.
대표청구항
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What is claimed is: 1. A printable sheet comprising: a top material including a first polymer and having a back side and a print-receptive front side; a polymer carrier layer attached directly to the back side in a manner so as to prevent separation therefrom and including a second polymer which is
What is claimed is: 1. A printable sheet comprising: a top material including a first polymer and having a back side and a print-receptive front side; a polymer carrier layer attached directly to the back side in a manner so as to prevent separation therefrom and including a second polymer which is a different polymer than the first polymer; at least one cut line through the top material to form at least a portion of a perimeter of a subdivided sheet; and the polymer carrier layer having stress and elongation properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the sheet, the printable sheet can be folded so that the polymer carrier layer snap breaks along one of the at least one cut line to form an edge of a separate or separable printed subdivided sheet whose bottom surface is formed by a portion of a bottom surface of the printable sheet. 2. The printable sheet of claim 1 wherein the first polymer is a polyolefin. 3. The printable sheet of claim 1 wherein the first polymer is a printable polymer. 4. The printable sheet of claim 1 wherein the first polymer is polypropylene and the second polymer is polymethylpentene. 5. The printable sheet of claim 1 wherein the printable sheet snap-breaks with only a single fold. 6. The printable sheet of claim 5 wherein the single fold is a forward fold towards the front side. 7. The printable sheet of claim 1 wherein the second polymer is selected from the group of polymethylpentene, polyolefins, polyesters, polypropylene, polyethylene, copolymers of propylene and ethylene, polymethyl methacrylate, polystyrene, and compatible mixtures thereof. 8. The printable sheet of claim 1 further comprising a layer which can be printed with at least one of an inkjet printer or a laser printer, on a side of the polymer carrier layer opposite to the top material. 9. The printable sheet of claim 1 wherein the at least one cut line does not penetrate into the polymer carrier layer. 10. The printable sheet of claim 1 wherein the second polymer is a crystalline polymer. 11. The printable sheet of claim 1 wherein the second polymer is a semi-crystalline polymer. 12. The printable sheet of claim 1 wherein the polymer carrier layer includes the second polymer and a nucleating agent. 13. The printable sheet of claim 1 wherein the printable sheet defines a card sheet and the printed subdivided sheet defines a card. 14. The printable sheet of claim 1 wherein the at least one cut line includes intersecting horizontal and vertical cut lines through the top sheet and defining perimeters of a plurality of cards in a central area of the top sheet and surrounded by a waste border portion of the top material. 15. The printable sheet of claim 1 further comprising a printable layer on a side of the polymer carrier layer opposite that of the top material and having a bottom surface which has been treated to enhance printability thereof by an inkjet or laser printer. 16. The printable sheet of claim 1 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point. 17. The printable sheet of claim 1 wherein the top material comprises a top material layer. 18. The printable sheet of claim 1 further comprising an antistatic coating on a back side of the polymer carrier layer. 19. The printable sheet of claim 1 wherein the printable sheet has a thickness of 7-15 mils. 20. The printable sheet of claim 1 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point. 21. A printable sheet comprising: a top material including a first polymer and having a front side and a back side; a polymer carrier layer attached to the back side in a manner so as to prevent separation therefrom and including a second polymer which is a different polymer than the first polymer; intersecting horizontal and vertical cut lines through the top material and defining perimeters of a plurality of cards in a central area of the top material and surrounded by a waste border portion; the polymer carrier layer and the vertical and horizontal cut lines having properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the front side, the printable sheet can be folded with only a single first fold to snap break the polymer carrier layer along one of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet and the printable sheet can be folded with only a single second fold to snap break the polymer carrier layer along a portion of the other of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet; and the separate or separable printed subdivided sheet including a portion of the top material and a portion of the polymer carrier layer attached to the portion of the top material in a manner so as to prevent separation of the portions. 22. The printable sheet of claim 21 wherein the first polymer is a polyolefin. 23. The printable sheet of claim 21 wherein the first polymer defines a polymer layer and the top material includes a printable coating on the polymer layer. 24. The printable sheet of claim 21 wherein the first polymer is a printable polymer. 25. The printable sheet of claim 21 wherein the first polymer is polypropylene and the second polymer is polymethylpentene. 26. The printable sheet of claim 21 wherein the polymer carrier layer is extruded onto the back side. 27. The printable sheet of claim 21 wherein the printable sheet snap-breaks with only a single fold. 28. The printable sheet of claim 27 wherein the single fold is a forward fold towards the front side. 29. The printable sheet of claim 27 wherein the single fold is between 45 and 165 degrees. 30. The printable sheet of claim 21 wherein the second polymer is selected from the group of polymethylpentene, polyolefins, polyesters, polypropylene, polyethylene, copolymers of propylene and ethylene, polymethyl methacrylate, polystyrene, and compatible mixtures thereof. 31. The printable sheet of claim 21 further comprising a layer which can be printed with at least one of an inkjet printer or a laser printer, on a side of the polymer carrier layer opposite to the top material. 32. The printable sheet of claim 21 wherein the horizontal and vertical cut lines do not penetrate into the polymer carrier layer. 33. The printable sheet of claim 21 wherein the second polymer is a crystalline polymer. 34. The printable sheet of claim 21 wherein the second polymer is a semi-crystalline polymer. 35. The printable sheet of claim 21 wherein the polymer carrier layer includes the second polymer and a nucleating agent. 36. The printable sheet of claim 21 wherein the printable sheet defines a card sheet and the printed subdivided sheet defines a card. 37. The printable sheet of claim 21 wherein the polymer carrier layer and the top material are coextensive with one another. 38. The printable sheet of claim 21 wherein a bottom print-receptive surface of the printable sheet opposite to the front side is printable by a printer or copier when the printable sheet is passed through the printer or copier. 39. The printable sheet of claim 21 wherein there is no intervening material between the back side and the polymer carrier layer. 40. The printable sheet of claim 21 wherein the top material comprises a top material layer. 41. The printable sheet of claim 21 further comprising an antistatic coating on a back side of the polymer carrier layer. 42. The printable sheet of claim 21 wherein the printable sheet has a thickness of 7-15 mils. 43. A printable sheet comprising: a top material including a first polymer and having a back side and a print-receptive front side; a polymer carrier layer attached directly to the back side in a manner so as to prevent separation therefrom and including a second polymer which is a different polymer than the first polymer; at least one cut line through the top material to form at least a portion of a perimeter of a subdivided sheet; the polymer carrier layer having stress and elongation properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the printable sheet, the printable sheet can be folded so that the polymer carrier layer snap breaks along one of the at least one cut line to form an edge of a separate or separable printed subdivided sheet; a bottom laser or ink-jet print-receptive surface of the printable sheet opposite to the front side being printable by a printer or copier when the printable sheet is passed through the printer or copier; a printable layer on the polymer carrier layer and which includes the print-receptive surface; and the print-receptive front side forming a top surface of the separate or separable printed subdivided sheet and the print-receptive surface forming a bottom surface of the separate or separable printed subdivided sheet. 44. The printable sheet of claim 43 wherein the print-receptive surface is an ink jet print-receptive surface. 45. The printable sheet of claim 43 wherein the print-receptive surface is a laser print-receptive surface. 46. The printable sheet of claim 43 wherein the first polymer is a polyolefin. 47. The printable sheet of claim 43 wherein the first polymer defines a polymer layer and the top material includes a printable coating on the polymer layer. 48. The printable sheet of claim 43 wherein the first polymer is a printable polymer. 49. The printable sheet of claim 43 wherein the first polymer is polypropylene and the second polymer is polymethylpentene. 50. The printable sheet of claim 43 wherein the polymer carrier layer is directly on the back side. 51. The printable sheet of claim 43 wherein the polymer carrier layer is extruded onto the back side. 52. The printable sheet of claim 43 wherein the printable sheet snap-breaks with only a single fold. 53. The printable sheet of claim 52 wherein the single fold is a forward fold towards the front side. 54. The printable sheet of claim 52 wherein the single fold is between 45 and 165 degrees. 55. The printable sheet of claim 43 wherein the second polymer is selected from the group ofpolymethylpentene, polyolefins, polyesters, polypropylene, polyethylene, copolymers of propylene and ethylene, polymethyl methacrylate, polystyrene, and compatible mixtures thereof. 56. The printable sheet of claim 43 wherein the at least one cut line does not penetrate into the polymer carrier layer. 57. The printable sheet of claim 43 wherein the second polymer is a crystalline polymer. 58. The printable sheet of claim 43 wherein the second polymer is a semi-crystalline polymer. 59. The printable sheet of claim 43 wherein the polymer carrier layer includes the second polymer and a nucleating agent. 60. The printable sheet of claim 43 wherein the printable sheet defines a card sheet and the printed subdivided sheet defines a card. 61. The printable sheet of claim 43 wherein the at least one cut line includes a vertical cut line and an intersecting horizontal cut line; and the polymer carrier layer and the vertical and horizontal cut lines have properties such that after the printable sheet has been passed through the printer or copier and the desired indicia printed on the front side, the printable sheet can be folded with only a single first fold so that the polymer carrier layer snap breaks along one of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet and the printable sheet can be folded with only a single second fold so that the polymer carrier layer snap breaks along a portion of the other of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet. 62. The printable sheet of claim 43 wherein the at least one cut line includes intersecting horizontal and vertical cut lines through the top sheet and defining perimeters of a plurality of cards in a central area of the top sheet and surrounded by a waste border portion of the top material. 63. The printable sheet of claim 43 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point. 64. The printable sheet of claim 43 wherein the top material comprises a top material layer. 65. The printable sheet of claim 43 wherein the printable sheet has a thickness of 7-15 mils. 66. The printable sheet of claim 43 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point. 67. A printable sheet comprising: a top material including a first polymer and having a back side and an exposed printable front side; a polymer carrier layer extruded directly on the back side in a manner so as to prevent separation therefrom and including a second polymer which is a different polymer than the first polymer; at least one cut line through the top material to form at least a portion of a perimeter of a subdivided sheet; the polymer carrier layer having stress and elongation properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the front side, the printable sheet can be folded so that the polymer carrier layer snap breaks along one of the at least one cut line to form an edge of a separate or separable printed subdivided sheet; and the printable sheet being contact adhesive free between the top material and the polymer earner layer. 68. The printable sheet of claim 67 wherein the polymer carrier layer is coextruded with the top material. 69. The printable sheet of claim 67 wherein the first polymer is a polyolefin. 70. The printable sheet of claim 67 wherein the first polymer defines a polymer layer and the top material includes a printable coating on the polymer layer. 71. The printable sheet of claim 67 wherein the first polymer is a printable polymer. 72. The printable sheet of claim 67 wherein the first polymer is polypropylene and the second polymer is polymethylpentene. 73. The printable sheet of claim 67 wherein the printable sheet snap-breaks with only a single fold. 74. The printable sheet of claim 73 wherein the single fold is a forward fold towards the front side. 75. The printable sheet of claim 73 wherein the single fold is between 45 and 165 degrees. 76. The printable sheet of claim 67 wherein the second polymer is selected from the group of polymethylpentene, polyolefins, polyesters, polypropylene, polyethylene, copolymers of propylene and ethylene, polymethyl methacrylate, polystyrene, and compatible mixtures thereof. 77. The printable sheet of claim 67 wherein the at least one cut line does not penetrate into the polymer carrier layer. 78. The printable sheet of claim 67 wherein the second polymer is a crystalline polymer. 79. The printable sheet of claim 67 wherein the second polymer is a semi-crystalline polymer. 80. The printable sheet of claim 67 wherein the polymer carrier layer includes the second polymer and a nucleating agent. 81. The printable sheet of claim 67 wherein the at least one cut line includes a vertical cut line and an intersecting horizontal cut line; and the polymer carrier layer and the vertical and horizontal cut lines have properties such that after the printable sheet has been passed through the printer or copier and the desired indicia printed on the front side, the printable sheet can be folded with only a single first fold so that the polymer carrier layer snap breaks along one of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet and the printable sheet can be folded with only a single second fold so that the polymer carrier layer snap breaks along a portion of the other of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet. 82. The printable sheet of claim 67 wherein the at least one cut line includes intersecting horizontal and vertical cut lines through the top sheet and defining perimeters of a plurality of cards in a central area of the top sheet and surrounded by a waste border portion of the top material. 83. The printable sheet of claim 67 wherein a bottom print-receptive surface of the printable sheet opposite to the front side is printable by a printer or copier when the printable sheet is passed through the printer or copier. 84. The printable sheet of claim 67 wherein the front side includes a laser or ink jet receptive coating. 85. The printable sheet of claim 67 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point. 86. The printable sheet of claim 67 wherein the top material comprises a top material layer. 87. The printable sheet of claim 67 further comprising an antistatic coating on a back side of the polymer carrier layer. 88. The printable sheet of claim 67 wherein the printable sheet has a thickness of 7-15 mils. 89. The printable sheet of claim 67 further comprising a printable layer on a side of the polymer carrier layer opposite that of the top material and having a bottom surface which has been treated to enhance printability thereof by an inkjet or laser printer. 90. A printable sheet comprising: a top material including a first polymer and having a back side and an exposed printable front side; a polymer carrier layer coated directly on the back side in a manner so as to prevent separation therefrom and including a second polymer which is a different polymer than the first polymer; at least one cut line through the top material to form at least a portion of a perimeter of a subdivided sheet; the polymer carrier layer having stress and elongation properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the front side, the printable sheet can be folded so that the polymer carrier layer snap breaks along one of the at least one cut line to form an edge of a separate or separable printed subdivided sheet whose bottom surface is formed by a portion of a bottom surface of the printable sheet; and the separate or separable printed subdivided sheet including a portion of the top material and a portion of the top material attached to a portion of the polymer carrier layer in a manner so as to prevent separation of the portions. 91. The printable sheet of claim 90 wherein the first polymer is a polyolefin. 92. The printable sheet of claim 90 wherein the first polymer defines a polymer layer and the top material includes a printable coating on the polymer layer. 93. The printable sheet of claim 90 wherein the first polymer is a printable polymer. 94. The printable sheet of claim 90 wherein the first polymer is polypropylene and the second polymer is polymethylpentene. 95. The printable sheet of claim 90 wherein the printable sheet snap-breaks with only a single fold. 96. The printable sheet of claim 95 wherein the single fold is a forward fold towards the front side. 97. The printable sheet of claim 95 wherein the single fold is between 45 and 165 degrees. 98. The printable sheet of claim 90 wherein the second polymer is selected from the group of polymethylpentene, polyolefins, polyesters, polypropylene, polyethylene, copolymers of propylene and ethylene, polymethyl methacrylate, polystyrene, and compatible mixtures thereof. 99. The printable sheet of claim 90 further comprising a layer which can be printed with at least one of an inkjet printer or a laser printer, on a side of the polymer carrier layer opposite to the top material. 100. The printable sheet of claim 90 wherein the at least one cut line does not penetrate into the polymer carrier layer. 101. The printable sheet of claim 90 wherein the second polymer is a crystalline polymer. 102. The printable sheet of claim 90 wherein the second polymer is a semi-crystalline polymer. 103. The printable sheet of claim 90 wherein the polymer carrier layer includes the second polymer and a nucleating agent. 104. The printable sheet of claim 90 wherein the printable sheet defines a card sheet and the printed subdivided sheet defines a card. 105. The printable sheet of claim 90 wherein the at least one cut line includes a vertical cut line and an intersecting horizontal cut line; and the polymer carrier layer and the vertical and horizontal cut lines have properties such that after the printable sheet has been passed through the printer or copier and the desired indicia printed on the front side, the printable sheet can be folded with only a single first fold so that the polymer carrier layer snap breaks along one of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet and the printable sheet can be folded with only a single second fold so that the polymer carrier layer snap breaks along a portion of the other of the vertical or horizontal cut lines to form an edge of a separate or separable printed subdivided sheet. 106. The printable sheet of claim 90 wherein the top material comprises a top material layer. 107. The printable sheet of claim 90 wherein the at least one cut line includes a grid of intersecting horizontal cut lines and vertical cut lines. 108. The printable sheet of claim 90 further comprising an antistatic coating on a back side of the polymer carrier layer. 109. The printable sheet of claim 90 wherein the printable sheet has a thickness of 7-15 mils. 110. A printable sheet comprising: a top material including a first polymer and having a front side and a back side; the front side including a laser or ink jet receptive coating; a polymer carrier layer directly on and abutting the back side and attached thereto in a manner so as to prevent separation therefrom; the polymer carrier layer including a second polymer which is a different polymer than the first polymer; at least one cut line through the top material to form at least a portion of a perimeter of a subdivided sheet; the polymer carrier layer having stress and elongation properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the coating, the printable sheet can be folded so that the polymer carrier layer snap breaks along one of the at least one cut line to form an edge of a separate or separable printed subdivided sheet whose top surface is formed by a portion of the laser or ink jet receptive coating and whose bottom surface is formed by a portion of a bottom surface of the printable sheet; and the printable sheet being free of contact adhesive layers. 111. The printable sheet of claim 110 wherein the first polymer is a polyolefin. 112. The printable sheet of claim 110 wherein the first polymer is a printable polymer. 113. The printable sheet of claim 110 wherein the first polymer is polypropylene and the second polymer is polymethylpentene. 114. The printable sheet of claim 110 wherein the printable sheet snap-breaks with only a single fold. 115. The printable sheet of claim 114 wherein the single fold is a forward fold towards the front side. 116. The printable sheet of claim 114 wherein the single fold is between 45 and 165 degrees. 117. The printable sheet of claim 110 wherein the second polymer is selected from the group of polymethylpentene, polyolefins, polyesters, polypropylene, polyethylene, copolymers of propylene and ethylene, polymethyl methacrylate, polystyrene, and compatible mixtures thereof. 118. The printable sheet of claim 110 further comprising a layer which can be printed with at least one of an inkjet printer or a laser printer, on a side of the polymer carrier layer opposite to the top material. 119. The printable sheet of claim 110 wherein the at least one cut line does not penetrate into the polymer carrier layer. 120. The printable sheet of claim 110 wherein the second polymer is a crystalline polymer. 121. The printable sheet of claim 110 wherein the second polymer is a semi-crystalline polymer. 122. The printable sheet of claim 110 wherein the polymer carrier layer includes the second polymer and a nucleating agent. 123. The printable sheet of claim 110 wherein the printable sheet defines a card sheet and the printed subdivided sheet defines a card. 124. The printable sheet of claim 110 wherein the at least one cut line includes intersecting horizontal and vertical cut lines through the top sheet and defining perimeters of a plurality of cards in a central area of the top sheet and surrounded by a waste border portion of the top material. 125. The printable sheet of claim 110 wherein a bottom print-receptive surface of the printable sheet opposite to the front side is printable by a printer or copier when the printable sheet is passed through the printer or copier. 126. The printable sheet of claim 110 wherein the top material comprises a top material layer. 127. The printable sheet of claim 110 wherein the at least one cut line includes a grid of intersecting horizontal cut lines and vertical cut lines. 128. The printable sheet of claim 110 further comprising an antistatic coating on a back side of the polymer carrier layer. 129. The printable sheet of claim 110 wherein the printable sheet has a thickness of 7-15 mils. 130. The printable sheet of claim 110 wherein the subdivided sheet is adapted to form a printed business card after the printable sheet has been passed through the printer or copier and the desired indicia printed on the coating and the subdivided sheet has been separated from the rest of the printable sheet by snap-break folding along the at least one cut line. 131. The printable sheet of claim 110 wherein the polymer carrier layer is directly on and abutting the back side without any intervening adhesive. 132. The printable sheet of claim 110 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point. 133. A printable sheet comprising: a top material including a first polymer and having a back side and a print-receptive front side; a polymer carrier layer including a second polymer which is a different polymer than the first polymer; a tie layer directly between the back side and a top side of the polymer carrier layer; the tie layer preventing separation of the top material from the polymer carrier layer; the tie layer being selected from the group of anhydride modified polypropylene, anhydride modified polyethylene, anhydride modified ethylene vinyl acetate, anhydride modified ethyl methyl acrylate, anhydride modified ethyl acrylic acid, ethylene vinyl acetate and copolymers and mixtures thereof; at least one cut line through the top material to form at least a portion of a perimeter of a subdivided sheet; and the polymer carrier layer having stress and elongation properties such that after the printable sheet has been passed through a printer or copier and desired indicia printed on the sheet, the printable sheet can be folded so that the polymer carrier layer snap breaks along one of the at least one cut line to form an edge of a separate or separable printed subdivided sheet whose top surface is formed by a portion of the print-receptive front side and whose bottom surface is formed by a portion of a bottom surface of the printable sheet. 134. The printable sheet of claim 133 wherein the second polymer is polymethylpentene and the first polymer is a polyolefin. 135. The printable sheet of claim 133 wherein the printable sheet has a thickness of 7-15 mils. 136. The printable sheet of claim 133 further comprising a printable layer on a side of the polymer carrier layer opposite that of the top material and having a bottom surface which has been treated to enhance printability thereof by an inkjet or laser printer. 137. The printable sheet of claim 133 wherein when the printable sheet is folded to snap break along the one of the least one cut line the polymer carrier layer snap breaks at a fracture point along the one of the at least one cut line, and wherein the adhering force between the top material and the polymer carrier layer is strong enough to concentrate the breaking stress of the printable sheet on the fracture point.
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