Flame-perforated films having controlled tear...

Details Flame-perforated films having controlled tear... Flame-perforated films having controlled tear...

B - Operations, Transporting

26

F

B26F 1/26 (2006.01) B32B 3/10 (2006.01)

Patent

CA 2693696

The disclosure is directed to methods, sys-tems, and apparatus for obtaining flame-perforated films which reduce or eliminate skewing of perforations in such films caused by thermal creep, whereby the film has per-forations arranged to provide controlled tear characteris-tics, especially in both the lengthwise or machine direction (MD), and the crosswise or transverse direction (TD).

L'invention concerne des procédés, des systèmes et des appareils pour obtenir des films perforés à la flamme qui réduisent ou éliminent la déformation de perforation dans de tels films provoquée par un fluage thermique, moyennant quoi le film comporte des perforations agencées pour conférer des caractéristiques de déchirement maîtrisées, spécialement à la fois dans la direction longitudinale ou de la machine (MD) et la direction de la largeur ou transversale (TD).

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