Manufacturing methods of glass strands and glass yarn

Abstract

[Lesson] The present invention provides a method of fabricating glass strands that produce less broken yarn when extended as fiberglass, and a method of fabricating glass yarns that produce less broken yarn, fluffing and long strips of glass yarn with a small quality deviation at the beginning and end of the coil when extended as fiberglass. [Solution Means] A method of manufacturing glass strands characterized by the inclusion of: (1) an extension step in which the raw yarn containing the glass composition is extended into glass fibers at melting temperatures of 1,500–3,500°C and a tension of 0.1–1.0 cN / root, which contains more than 90 mass% of SiO2 composition; In the bundling step, the glass fibers obtained in the aforementioned extension step were tied into bundles with 30 to 400 roots to produce glass strands.