Method for melt-spinning thermoplastic polymer fibers

Abstract

A thermoplastic polymer is melt-spun into a spinning tube decompressed to not more than 0.7 atm and withdrawn therefrom to the outer air through a narrow groove provided in a bottom sealing body which substantially seals the interior of the spinning tube from the outer air. The bottom sealing body is provided with a plurality of regulating chambers communicating with the groove, which chambers are controlled to have interior pressures of intermediate values between those of the spinning tube and the outer air, whereby the pressure pulsation of an air stream flowing into the interior of the spinning tube from the outer air through the groove can be avoided. This, in turn, ensures a smooth spinning operation and uniform yarn quality.

Dependencies are inferred from the claim text.