Method and apparatus for biaxially stretching a tubular film

Details Method and apparatus for biaxially stretching a tubular film Method and apparatus for biaxially stretching a tubular film

B - Operations, Transporting

29

C

18/1040

B29C 55/28 (2006.01) B29C 55/16 (2006.01) B29C 35/04 (2006.01)

Patent

CA 1159214

ABSTRACT OF THE DISCLOSURE Longitudinal and transverse stretching of a tubular film is effected by gripping opposite selvages of .the .tubular film between a pair of substantially coplanar pulleys and a pair of endless belt means trained arcuately around the pulleys, res- pectively, and by rotating the pulleys at a peripheral speed greater than a speed of feed of .the tubular film. As the film selvages progress along a pair of arcuate divergent paths, res- pectively, around the pulleys,..the film is heated, reversed in direction of travel, and cut along the selvages into a pair of biaxially stretched sheets. Before stretching of the film, live steam is introduced into the .tubular film for heàting same.

362699

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