Process for production of continuous inorganic fibers and appara

Details Process for production of continuous inorganic fibers and appara Process for production of continuous inorganic fibers and appara

1986-01-02

1988-02-09

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264205, 425461, D01D 504, D01D 402

Patent

active

047241098

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.

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