Toray Industries, Inc.

Yoko Iwaisaki

Makoto Sato

Isamu Moriguchi

Keitaro Onishi

An object of the invention is to provide a plastic film that is inapt to cause winding deviation, wrinkling and blocking even under a high-speed running condition. The invention provides a plastic film wherein at least 1,000 positive electrified patterns and at least 1,000 negatively electrified patterns each having an area of at most 10 mm,and an arbitrary shape are distributed per 100 cm,of the film, and a polypropylene film wherein the static friction coefficient &mgr;,between one surface of the film and another surface of the film is at least 0.2, and the dynamic friction coefficient &mgr;,therebetween is at least 0.08.

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Tsuchiura, Japan

Yoko Iwaisaki