Methods for producing glass strand and glass yarn

Abstract

A method for producing a glass strand, the method including: (1) a drawing step of drawing raw filaments composed of a glass composition containing SiO2 in a compositional amount of 90% by mass or more into glass fibers under conditions of a melting temperature of 1,500 to 3,500° C. and a tension of 0.1 to 1.0 cN per filament; and (2) a bundling step of bundling 30 to 400 of the glass fibers obtained in the drawing step to produce a glass strand. This can provide a method for producing a glass strand in which the occurrence of thread breakage during drawing into glass fibers is reduced, and a method for producing a glass yarn in which the occurrence of thread breakage or fuzzing during thread twisting is reduced and a variation in quality is small between the beginning part and end part of winding in a long-length glass yarn.

Dependencies are inferred from the claim text.