Development of Fire Resistant/Heat Resistant Sewing Thread
Final rept. Oct 2014-Jun 2015
SAM M BUTLER INC LAURINBURG NC
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This report documents work carried out by Service Thread to show that domestic technology exists which would reduce base fiber costs, versus current Nomex and Kevlar type threads and the processes and costs associated with such threads. Multifilament polyester yarn was used as a core, treated and untreated. Modified acrylic fiber Pyro-Tex was used as the sheath. Core to sheath ratio was 5050. The NeC 162 construction offered excellent physical properties. Modified acrylic fiber shed during processing and bi-component construction could not be dyed successfully to a solid, level Tan 499 shade. Finished thread sewed satisfactorily at high speeds however, it shed severely during sewing trials, indicating fiber tenacity was too low for use in a sewing thread construction. It is expected that a polyester core treated with a flame retardant finish and wrapped with Nomex fiber, with a core to sheath ratio of 7030 will offer a high performance, low cost sewing thread with required fire resistantheat resistant properties.