Fuji Photo Film Company, Limited

Hiroshi Okuyama

Hideo Kawaguchi

Noburo Hibino

Akira Hasegawa

Teruo Kobayashi

Hisao Takahashi

Kikuo Yamagisi

Kikuo Yamagis

An embossing device for roughening a lateral edge of a molded thermo-plastic sheet material by deforming it with a mechanical deforming device is disclosed. The device comprises a pair of rollers whose outer walls are rough and a structure for abutting these rollers against each other under pressure. The rough outer wall of at least one of the pair of rollers having a rough surface is provided with a plurality of relatively smooth stripes. The stripes are arranged in the width-wise direction of said roller.

Edge embossing device

A film embossing process of roughening a lateral edge of a thermo-plastic film by mechanically deforming said lateral edge. The lateral edge is subjected to the film embossing process at a temperature of from the glass transition temperature (Tg) of the film to the temperature of (tg+60.degree. C.). Subsequently the film is subjected to heat treatment at a temperature higher than the temperature of said film embossing process by at least 10.degree. C. to 30.degree. C.

Film embossing process

A process for the production of a polyethylene terephthalate film characterized by carrying out heat setting after biaxial elongation so that the heat set temperature and heat set time may satisfy the following relations:

Production of polyethylene terephthalate film having improved resistance

A colored polyetylene terephthalate film to be employed as the support in radiographic films, having incorporated therein certain specific anthraquinone dyes.

Growing community of inventors

Minami-ashigara, Japan

Hiroshi Okuyama