Method of and apparatus for stretching film

Details Method of and apparatus for stretching film Method of and apparatus for stretching film

B - Operations, Transporting

29

C

18/1044, 18/1077

B29C 55/02 (2006.01)

Patent

CA 1096128

E.I. du Pont de Nemours and Company (Levy, S.B. & Garlington, W.D.) ABSTRACT OF THE DISCLOSURE A method and apparatus are provided for stretching polymeric film wherein a web of film is preferentially heated and thereafter stretched, such heating being accomplished by air moving past electric heaters positioned in thermal isola- tion zones in a duct the bottom wall of which has an aperture located closely adjacent a surface of the film and between the inner edges of tenter frame clips carrying the film whereby, by varying the input to a selected heater, air pass- ing through the aperture onto the web will preferentially heat it.

273606

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