Toray Industries, Inc.

Isoo Saito

Kotaro Fujioka

Katsumi Hasegawa

Michio Ohno

Hideo Nagahara

Takuji Sato

Hideo Saruyama

Hajime Arai

Koichi Kubota

Masaharu Yamamoto

Michikane Tuduki

Ryoji Okano

Hiroyuki Terasawa

Eiji Ohtsubo

Treatment for reducing friction of seat belts

High-strength polyamide fiber

A conjugated fiber having a sheath-core conjugated structure comprising a polyester core component composed mainly of polyethylene terephthalate and a polyamide sheath component composed mainly of polyhexamethylene adipamide, is disclosed, which has excellent mechanical properties such as a high tenacity, a high modulus, and an improved dimensional stability, and an improved adhesion to a rubber, especially a high-temperature adhesion, an improved heat resistance in a rubber, and a high fatigue resistance, and thus is useful as an industrial material. By adopting a high-speed spinning procedure in the fiber preparing process, the peel resistance in the interface of the sheath-core conjugated structure is greatly improved, and the following valuable characteristics not possessed by conventional conjugated yarns can be obtained:

High-tenacity conjugated fiber and process for preparation thereof

A thermoplastic polymer yarn is spun into a spinning tube charged with a pressurized gas of more than 1 kg/cm.sup.2 G and withdrawn through a yarn exit provided with a unique sealing device which substantially prevents the charged gas from leakage but allows passage of the yarn out from the spinning tube. The resultant yarn has a high molecular orientation due to the improved quenching effect and the increase of resistance against yarn travelling of the charged gas.

Apparatus for melt-spinning thermoplastic polymer fibers

A thermoplastic polymer yarn is spun into a spinning tube charged with a pressurized gas of more than 1 kg/cm.sup.2 G and withdrawn through a yarn exit provided with a unique sealing means which substantially prevents the charged gas from leakage but allows passage of the yarn out from the spinning tube. The resultant yarn has a high molecular orientation due to the improved quenching effect and the increase of resistance against yarn travelling of the charged gas.

Method for melt-spinning thermoplastic polymer fibers

A polyester multifilament yarn which has the following properties: an initial modulus (Mi) of 90 to 130 grams per denier, a terminal modulus (Mt), a shrinkage index value (.DELTA.S/IV) of 2 to 8 percent, a birefringence (.DELTA.n) of 165.times.10.sup.-3 to 190.times.10.sup.3, a crystalline orientation function (fc) of 0.93 to 0.97, a crystal size (D) 47 to 55 angstroms, a long period (Lp) of 130 to 145 angstroms, a molecular orientation index in the amorphous region (F) of 0.80 to 0.92, and a concentration of carboxyl end groups (--COOH) of 0 to 25 equivalents per 10.sup.6 grams of the polymer is disclosed. The yarn is improved in modulus and shrinkage. A textile reinforcement for tire cord obtained from the multifilament yarn, exhibits exceedingly improved resistance to fatigue and durability to heating. The polyester multifilament yarn is obtained by (A) melt-spinning polymer at high speed (B) solidifying the spun yarn through a solidification zone comprising (a) a heating zone and (b) cooling zone adjacent to the lower part of the heating zone, and (C) withdrawing the solidified yarn, and (D) hot drawing the yarn.

Polyester multifilament yarn and process for producing thereof

Process for producing polyamide monofilament including partially orienting polyamide monofilament, steaming the partially oriented monofilament, heating and relaxing under low tension for disturbing the molecular orientation of the skin layer of said monofilament and drawing the relaxed monofilament to raise the molecular orientation of its core. Monofilaments of this invention are high in knot strength and are two-layer structures comprising a core and a skin layer. The monofilaments have an average index of birefringence of at least about 50.times.10.sup.-3 and a degree of molecular orientation in the amorphous region of said skin layer of not more than about 0.5.

Process for producing high knot strength polyamide monofilaments

Growing community of inventors

Okazaki, Japan

Isoo Saito