IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0250919
(2002-01-07)
|
우선권정보 |
GB-0100352.4(2001-01-08) |
국제출원번호 |
PCT/EP02/000075
(2002-01-07)
|
§371/§102 date |
20031008
(20031008)
|
국제공개번호 |
WO02/053473
(2002-07-11)
|
발명자
/ 주소 |
- Hewitt,Jonathan
- Mills,Peter
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
16 인용 특허 :
4 |
초록
▼
There is described a flexible oriented film (301) which acts a replacement for tear film, the film (301) having at least one tear susceptible line (307, 309) or pattern thereon (preferably weaker than the surrounding film), the film tearing substantially therealong when tearing is initiated therealo
There is described a flexible oriented film (301) which acts a replacement for tear film, the film (301) having at least one tear susceptible line (307, 309) or pattern thereon (preferably weaker than the surrounding film), the film tearing substantially therealong when tearing is initiated therealong, characterised in that the line (307, 309) or pattern has substantially the same thickness normal to the film surface (gauge) as the rest of the film; and/or the film material therealong is substantially differently (preferably more) oriented (in extent and/or direction) to that in the rest of the film. The means for forming the line (307, 309) or pattern is preferably a laser (e.g. infra-red CO2 laser) set at a sufficiently low power not to ablate material therealong but at a sufficiently high power to reorient the film therealong. A method of preparing such films (301) and packaging (721) (such as cigarette packs) overwrapped with such films ( 601) are also described.
대표청구항
▼
The invention claimed is: 1. A flexible, oriented polymeric, film having a thickness of from about 10 to about 120 microns and having at least one tear susceptible line(s) and/or pattern(s) thereon, wherein the film material within the line(s) and/or pattern(s) has a substantially improved, enhance
The invention claimed is: 1. A flexible, oriented polymeric, film having a thickness of from about 10 to about 120 microns and having at least one tear susceptible line(s) and/or pattern(s) thereon, wherein the film material within the line(s) and/or pattern(s) has a substantially improved, enhanced or redirected orientation to material in the rest of the film, the line(s) and/or pattern(s) lines having substantially the same gauge as the rest of the film, and the line(s) and/or patterns being formed by a directed chemical and/or radiation treatment which removes substantially no material from the film. 2. A film as claimed in claim 1, in which the material in the line(s) and/or pattern(s) is substantially more oriented in extent and/or direction that the material in the rest of the film. 3. A film according to claim 1, which comprises a thermoplastic polymer. 4. A film according to claim 1, which comprises a polyolefin and/or polyester. 5. A film according to claim 1, which comprises polypropylene. 6. A film as claimed in claim 1, which is biaxially oriented in substantially perpendicular directions. 7. A film as claimed in claim 1, in which in which the line(s) and/or pattern(s) thereon are formed by a directed treatment selected from irradiation through patterned lithographic masks, positioning of a chemical along the line; and/or focussed electromagnetic radiation and/or particulate radiation. 8. A film according to claim 1, in which the line(s) and/or pattern(s) are formed by ink-jet printing, chemical treatment or coating onto the film. 9. A film according to claim 1 in which the line(s) and/or pattern(s) are formed by laser treatment. 10. A film according to claim 9, in which the laser is a CO2 laser having a wavelength about 10.6 μm. 11. A film according to claim 1, which has printing thereon. 12. A film according to claim 11, in which the printing indicates a position for initiating tearing of the film along at least one of the line(s) and/or pattern(s). 13. A film according to claim 1, in which at least one of the line(s) and/or pattern(s) extend to an edge of the film. 14. A film according to claim 1, having a cut extending from the edge of the film and/or a tab affixed thereto to assist in the initiation of a tear along at least one of the line(s) and/or pattern(s) on the film. 15. A film according to claim 1, in which at least one of the line(s) and/or pattern(s) on the film is sufficiently weaker than the rest of the film to enable tearing to be initiated therealong by hand pressure. 16. A package comprising at least one article wrapped in a flexible polymeric film as claimed in any of claim 1. 17. A package as claimed in claim 16, which is capable of being opened by finger pressure substantially along the line(s) and/or pattern(s) when tearing is initiated therealong. 18. A package according to claim 16, in which the film has been sealed around the article and tearing occurs with peeling of the seal. 19. A package according to any of claim 16, in which the film has been heat sealed around the article. 20. A package according to any of claim 16, in which printing thereon indicates a position for initiating tearing of the film to open the package. 21. A package according to any of claim 16, in which at least one tear susceptible line and/or pattern extends to the edge of the film on the package. 22. A package according to any of claim 16, having a cut extending from the edge of the film to assist in the initiation of a tear along a tear susceptible line and/or pattern on the film.
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