Method of stretching film and such film

Details Method of stretching film and such film Method of stretching film and such film

B - Operations, Transporting

29

C

B29C 55/16 (2006.01)

Patent

CA 2393474

A method of stretching films in which all or a portion of the width of the film is cooled during or just after stretching so as to improve the uniformity of the film. The method includes stretching a polymeric film (26) in a tenter (10) that grasps the film with a plurality of clips (22, 24) along the opposing edges of the film (26) and propels the clips (22, 24) to thereby stretch the film. The tenter (10) includes driven clips (22) and idler clips (24), with at least one idler clip (24) between respective pairs of driven clips (22). The cooling is done so as to improve the uniformity of the clip spacing relative to the spacing obtained at otherwise identical process conditions without such cooling.

L'invention concerne un procédé d'étirement de films consistant à refroidir la totalité ou une partie de la largeur d'un film pendant ou juste après un étirement de manière à améliorer l'uniformité de ce film. Ce procédé consiste à étirer un film polymérique (26) dans une rame (10) permettant de retenir le film au moyen d'une pluralité d'attaches (22, 24) le long des bords opposés dudit film (26) et de faire avancer ces attaches (22, 24) de façon à étirer le film. Cette rame (10) comprend des attaches à entraînement (22) et des attaches libres (24), au moins une attache libre (24) se trouvant entre des paires respectives d'attaches à entraînement (22). Le refroidissement permet d'améliorer l'uniformité de l'espacement des attaches par rapport à l'espacement obtenu dans des conditions de traitement identiques mais sans ce refroidissement.

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