Apparatus and high speed process for making highly stretched...

Details Apparatus and high speed process for making highly stretched... Apparatus and high speed process for making highly stretched...

B - Operations, Transporting

29

C

B29C 55/00 (2006.01) B29C 55/06 (2006.01) B29D 7/00 (2006.01)

Patent

CA 2319305

An apparatus and high speed process for heating and stretching a film having a bridle mechanism comprising a first heated roll and a second heated roll. The film is stretched as the film is transferred from the first heated roll to the second heated roll which rotates at a speed greater than the speed at which the first heated roll rotates. The film is fed into the bridle mechanism at a rate of about 1,500 fpm to about 2,500 fpm wherein it is stretched to a length that is up to about 450% greater than its initial, pre-stretched length. The increased contact between the large diameter heated rolls and the film and the short draw gap between the two heated rolls result in a highly stretched film having minimal neck-in.

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