Calendered film of polypropylene resin

Details Calendered film of polypropylene resin Calendered film of polypropylene resin

1997-06-02

1998-10-13

Teskin, Fred

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428143, 4283179, 428409, 428910, 521143, 521144, 524427, 524583, 524584, 525198, 525240, 5263481, B29D 701

Patent

active

058209700

ABSTRACT:
Polypropylene films which have cavities distributed in the film and on the surfaces are suitable for writing or printing and have a low density. The films have surface qualities of each side of surface within .+-.2.times.10.sup.-6 inch of the average depth of the cavities, .+-.2% of the average of the gloss at 45.degree. angle and .+-.0.02 of the average of coefficient of friction. Such a film is obtained by passing the molded film from the calender through a set of heating rolls at temperatures revealed in this invention before entering the stretching system. The obtained polypropylene film has superior printability, low density and high stiffness, and thus is suitable for use as a paper substitute.

REFERENCES:
patent: 3765999 (1973-10-01), Toyeda
patent: 3790435 (1974-02-01), Tanba et al.
patent: 4318950 (1982-03-01), Takashi et al.
patent: 5233924 (1993-08-01), Ohba et al.
patent: 5439628 (1995-08-01), Huang

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