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:
Feb. 09, 1988
Filed:
Jan. 02, 1986
Mitsuo Yamashita, Niigata, JP;
Akihisa Shirasaka, Fujieda, JP;
Ichiro Nagashima, Fujieda, JP;
Katunosin Isogai, Itoigawa, JP;
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Nitivy Co., Ltd., Tokyo, JP;
Abstract
A process for the production of continuous inorganic fibers is disclosed which comprises causing a spinning dope composed of a water-soluble organic polymer, a water-soluble inorganic salt capable of forming a refractory inorganic oxide, additives, and water and adjusted to a viscosity of 200 to 2000 poises at 20.degree. C. to be dry spun by the use of a spinning nozzle containing a plurality of spinnerets each provided on the spinning dope outlet side of a nozzle plate with a protuberance having a wall thickness of not more than 0.5 mm at the tip thereof and subjecting the spun threads of the spinning dope to a thermal treatment. An apparatus for working the process is also disclosed which is provided with a spinning nozzle having a plurality of spinnerets bored through a nozzle plate and severally through protuberances formed on the spinning dope outlet side of the nozzle plate in such a manner that the walls of the protuberances surrounding the spinnerets have a thickness of not more than 0.5 mm at the tips of the protuberances and the spinnerets so piercing the protuberances are radially constricted on the spinning dope outlet side.