Process for production of polypropylene sheets or films

Details Process for production of polypropylene sheets or films Process for production of polypropylene sheets or films

1991-10-07

1993-05-18

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642102, 2642105, 264235, 264280, 264346, 425 71, B29C 4790

Patent

active

052118991

ABSTRACT:
A process for producing a polypropylene resin sheet or film by introducing a polypropylene resin in a film form, which has been extruded from a T-die in a molten state, into a slit through which cooling water is flowing, passing the polypropylene resin film between nip rolls, and pressing the obtained sheet or film from both sides thereof under a pressure of at least 5 kg/cm.sup.2, while heating at a temperature of 155.degree. to 160.degree. C., by the use of a metal belt having a surface roughness of not more than 0.1 .mu.m. The process produces a sheet or film of a polypropylene resin which is unstretched and is excellent in transparency, surface gloss and heat moldability.

REFERENCES:
patent: 3345447 (1967-10-01), Grant
patent: 3383375 (1968-05-01), van der Vegt et al.
patent: 4548778 (1985-10-01), Fujii
patent: 4832770 (1989-05-01), Nojiri et al.
patent: 4863653 (1989-09-01), Takubo et al.
patent: 4925379 (1990-05-01), Boorelier

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