Process for the production of biaxially stretched films and appa

Details Process for the production of biaxially stretched films and appa Process for the production of biaxially stretched films and appa

1987-06-09

1989-02-07

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264 25, 2642107, 26421113, 26421118, 2642112, 264216, 2642358, 2642902, 264327, 425 66, 425 721, 425224, 4251744, B29C 4788

Patent

active

048030279

ABSTRACT:
In the process for the production of thin, biaxially stretched films from polypropylene, the latter is melted in an extruder and extruded from a slot die over the surface of a take-off roll. The plastic melt cooled on the surface of the take-off roll into an intermediate film is temperature-treated in the region of the take-off roll in a zone and the intermediate film is subsequently biaxially stretched and heat-set in a known way. At a take-off roll temperature T.sub.W of between 10.degree. C. and 100.degree. C., blowing air of a temperature T.sub.L greater than/equal to 30.degree. C. is blown onto the film surface on the air side not in contact with the circumferential surface of the take-off roll, the duration for this temperature treatment being at least 1.5 seconds.

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