Nippon Petrochemicals Company, Limited

Polymer Processing Research Inst., Ltd.

Hirotsune Okada

Kazuhiko Kurihara

Hiroshi Yazawa

Toshikazu Ohishi

Tsutomu Matsuzaki

A rotary splitting tool for splitting a web of plastic material to fabricate a fibrillated web, comprising a rotatable body having a plurality of transverse ridges provided on the periphery in a circumferentially equidistant relationship and extending generally parallel to the central rotation axis, and rows of cutting edges provided on the transverse ridges, respectively. Convex walls are provided on the periphery of the body between the adjacent transverse ridges. The convex wall means receives a web to be split so that oscillation of the web during repeated operations of the cutting edges can be minimized to reduce noise and prevent irregular slits.

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Yachiyo, Japan

Hirotsune Okada