The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 04, 2011
Filed:
Feb. 20, 2008
Hisao Okumura, Matsuyama, JP;
Fuyuki Terasaka, Matsuyama, JP;
Hisao Okumura, Matsuyama, JP;
Fuyuki Terasaka, Matsuyama, JP;
Teijin Fibers Limted, Osaka, JP;
Abstract
The polyethylene naphthalate fiber for industrial material having a low fatigue in a composite is a polyethylene naphthalate fiber for industrial material containing an ethylene-2,6-naphthalate unit in 80% or more, characterize by having a strength of 6 cN/dtex or more and a secondary yield point elongation degree of 8% or less. The production method thereof is a method for producing a fiber in which a fiber having been obtained by melt-spinning a polyethylene naphthalate is subjected to stretching, characterized in that prestretch satisfying such conditions as the fiber temperature of from 80° C. to 120° C. and from 0.05 to 0.3 N/dtex is performed, a first stretch satisfying such conditions as the fiber temperature of from 130° C. to 180° C. and stretch tensile force of not more than the prestretch tensile force is performed, the total stretch magnification including subsequent stretches is set to 5 or more, and finally heat-treatment under tension with a stretch ratio of from 0 to 2% is performed.