Vacuum pinning process

Details Vacuum pinning process Vacuum pinning process

1987-06-17

1988-11-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264216, 264237, 264348, 425 66, 425224, 4253261, B29C 3942

Patent

active

047833041

ABSTRACT:
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.

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patent: 3423274 (1969-01-01), Lahm et al.
patent: 3423493 (1969-01-01), Klenk et al.
patent: 3456293 (1969-07-01), De Smedt et al.
patent: 3502757 (1970-03-01), Spencer
patent: 3734984 (1973-05-01), Hoffman
patent: 4066729 (1978-01-01), Van Cappellen

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