Vacuum pinning process

Details Vacuum pinning process Vacuum pinning process

B - Operations, Transporting

29

C

18/1036

B29C 39/42 (2006.01) B29C 41/26 (2006.01) B29C 47/88 (2006.01)

Patent

CA 1319243

13 TITLE VACUUM PINNING PROCESS Abstract of the Disclosure A process improvement for preparing thermoplastic polymeric film, preferably of polyethylene terephthalate, by extruding a web in melt form onto a quench drum with a surface roughness of at least 3 microinches. In casting webs of less than about 5 mils in thickness the improvement involves drawing the melt to a melt drawdown ratio of less than about 25 and spacing the die lips from the quench roll at less than about 120 mils, preferably 20 to 80 mils. It is also preferred that the flow stability index be greater than 5.

573832

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