Methods of stretching films and such films

Details Methods of stretching films and such films Methods of stretching films and such films

B - Operations, Transporting

29

C

B29C 55/16 (2006.01)

Patent

CA 2348097

A method of biaxially stretching a polymeric film according to an overstretch stretch profile to a final first direction stretch parameter and a final second direction stretch parameter. The method comprising the steps of: a) imparting a sufficiently high temperature to the film to allow a significant amount of biaxal stretch; b) biaxial tenter stretching the film to a peak first direction stretch parameter (48) that is at least 1.2 times the final first direction stretch parameter (14), wherein the final first direction stretch parameter is no larger than the final second direction stretch parameter; and c) subsequent to step (b), retracting the film in the first direction to the final first direction stretch parameter.

Procédé permettant d'étirer biaxialement un film polymère en fonction d'un profil d'étirement d'hyper-étirement jusqu'à un paramètre d'étirement de première direction final et à un paramètre d'étirement de seconde direction final. Le procédé comprend les étapes suivantes: a) on soumet le film à une température suffisamment élevée pour permettre un étirement biaxial significatif; b) on étire le film biaxialement sur une rame jusqu'à un paramètre d'étirement de première direction maximum (48), qui est au moins égal à 1,2 fois le paramètre d'étirement de première direction final (14), le paramètre d'étirement de première direction final n'étant pas supérieur au paramètre d'étirement de seconde direction final; et c) après l'étape (b), on rétracte le film dans la première direction jusqu'au paramètre d'étirement de première direction final.

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