Teijin Limited

Atsushi Yamamoto

Hideo Katoh

Tomio Adachi

Yukio Kitamura

Satoshi Yakushiji

Nobuo Yoshioka

A polyester film characterized by having many uneven units on its surface, each of said uneven units being composed of a fine projection and a depression existing therearound, and a process for producing aforesaid polyester film, which comprises pre-heating an unstretched polyester film containing internal particles attributed to an inert additive having an average particle diameter of 0.05 to 5 .mu.m and/or a catalyst residue to a temperature of 80.degree. to 120.degree. C.; stretching the film in a first axial direction to 2.6 to 3.5 times at a temperature of 110.degree. to 145.degree. C.; thereafter, stretching the film in a second axial direction at right angles to the first axial direction to 3.0 to 4.0 times at a temperature of 100.degree. to 150.degree. C.; and then heat-setting the stretched film at a temperature of 160.degree. to 240.degree. C.

Polyester film with projections and depressions on the surface

A method of taking up a bundle of filaments is disclosed wherein the bundle of filaments is ejected together with a compressed fluid toward a container and coils of the bundle of filaments are formed when the bundle of filaments is received in the container. Before arriving at the container, the above-mentioned compressed fluid is deviated from a passage of the bundle of filaments having a spiral shape. The apparatus for effectively carrying out this method comprises a rotary member rotating around the central line of the upstream portion of a guide passage for feeding the bundle of filaments toward the container and means, which ejects the bundle of filaments being conveyed into the rotary member in the above-mentioned upstream portion by means of a compressed fluid. The rotary member has a guide passage that expands gradually toward the outlet end of the guide passage. When the above-mentioned apparatus is operated, the bundle of filaments runs along the rearmost portion of the inside wall of the guide passage, which defines the running passage of the bundle of filaments, while the compressed fluid is separated from the above-mentioned bundle of filaments and discharged in a different direction.

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Matsuyama, Japan

Atsushi Yamamoto