Method for continuously stretching plastic film

Details Method for continuously stretching plastic film Method for continuously stretching plastic film

B - Operations, Transporting

29

C

18/523

B29C 61/06 (2006.01) B29C 55/02 (2006.01) B29C 55/18 (2006.01) B29C 47/00 (2006.01)

Patent

CA 1150919

13589 METHOD FOR CONTINUOUSLY STRETCHING PLASTIC FILM ABSTRACT OF THE DISCLOSURE This invention relates to the treatment of plastic sheet material and especially co-extruded sheet of orientable plastic material which is comprised of film and foam layers which are continuously stretched in a longitudinal direction. The stretching is effected between a pair of rolls which are maintained at different temperatures and rotated at different rates of rotation to effect a cold stretching of the film-foam laminate to improve its shrink capability and lower its shrink temperature upon usage in various packaging applications. A preferred material is polyethylene which is co-extruded into a laminate of film and foam layers and which exhibits improved shrinkage characteristics when employed in the form of tubular sleeves for container labels or bands.

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