Toyo Boseki Kabushiki Kaisha

Kasuga Denki Co., Ltd.

Kunio Takeuchi

Katsuaki Kuze

Hajime Suzuki

Osamu Makimura

Akito Hamano

Masahiro Kobayashi

Meiji Anahara

Arao Kakinaka

Tokio Kokubu

Hiroshi Hashimoto

Haruo Okudaira

Yoshiyasu Arai

Masanori Saka

Yasutomi Yoshino

Takeshi Ohta

Maki Matsuo

Eiichi Nagayasu

Yoji Komura

Fumio Nishimura

Haruhiko Watanabe

Tohji Yoshida

Tsukasa Akaishi

Shigeru Takematsu

Yukio Ikushima

Hiroyoshi Kamatani

Koichi Matsunaga

Mamoru Shimakura

A process for preparing a polyamide type film which comprises melt-extruding a polyamide resin having a metal compound and a melt specific resistance of not more than 1.5.times.10.sup.5 .OMEGA.cm at 260.degree. C. in a form of a film, contacting the melt-extruded film closely with a revolving cooling drum through static electricity and taking up the film while cooling rapidly to solidify, which provides remarkable improved adhesion by static electricity. As a result, increasing the take-up rate of the revolving cooling drum does not cause trapping of air between the drum and the film so that a film having excellent uniformity in thickness and transparency can be produced.

Process for preparing polyamide film

A biaxially stretched polyester film comprising a polyester and zirconium as an internal particle material, produced by polycondensation of terephthalic acid or its esterified derivative and alkylene glycol as the major essential monomeric components in the presence of a polycondensation catalyst, during which zirconium in the form of any compound thereof in an amount of 80 to 2500 ppm in terms of zirconium atom to the polyester as produced being introduced into the reaction system at a stage after the initiation of the reaction and before the intrinsic viscosity of the reaction mixture reaching 0.2, and subjecting the produced polyester to film forming.

Biaxially stretched polyester films

A process for production of a sheet of a polyamide material which comprises extruding the polyamide material in a melt state in the form of sheet and bringing the extruded sheet in a melt state into contact with the surface of a moving chill body for quenching to give an undrawn film, characterized in that a direct current of high voltage is applied between an electrode and the extruded sheet so as to product a discharge in a streamer corona state onto the extruded sheet, whereby the extruded sheet is brought into tight and close contact with the surface of the moving chill body electrically grounded so as to be chilled quickly.

Electrostatic pinning of extruded polyamide film

An apparatus for detecting a defect in a sheet like material, comprising: a photodetector provided opposite to a textile sheet in the vicinity of the weaving line of a weaving machine, and a prime mover for slidably driving said photodetector in the lateral direction throughout the width of the weaved textile sheet, characterized in that normally the said prime mover is adapted to convert the moving direction whenever the photodetector reaches either side edge of the weaved textile sheet but is further adapted to reverse the moving direction whenever the photodetector detects a defect in the weaved textile sheet, whereby said photodetector is caused to detect repeatedly the same defect and the weaving machine is controlled to stop the weaving operation whenever the photodetector detects the same defect more times than a predetermined number of times.

Apparatus for detecting defects in sheet material

Method and apparatus suitable for producing a spun yarn at high speed from short fibers less than 50 mm. in length. A bundle of fibers having a particular thickness distribution in its width direction is supplied through a fluid jet false-twist nozzle in which a throttle portion connecting the upstream and downstream portions of the yarn passageway is provided non-eccentrically or eccentrically with respect to the downstream portion, and the downstream portion has a fluid conduit opening eccentrically there into and inclined toward the outlet end of the downstream portion. Air preferably containing water at room temperature in the form of mist is used as the fluid jetted through said nozzle.

Process and apparatus for producing yarns

Growing community of inventors

Inuyama, Japan

Kunio Takeuchi