HEAT RESISTANT SEWING THREAD AND METHOD OF ITS MANUFACTURING Russian patent published in 2010 - IPC D02G3/46 

FIELD: textile, paper.

SUBSTANCE: heat resistant sewing thread contains at least two twisted reinforced threads and preparing composition. Each reinforced thread includes core and braiding. Core consists of one or two complex threads from heat resistant non-thermoplastic paraamide threads with decay temperature over 500°, with permanent strain after rupture 2.5-5.0% and strength of 150-245 gs/tex. Braiding is made of thermomelting and heat shrinkable polyester fibres with melt temperature of 240-260°, with zero strength temperature of 260-280°, with heat shrinkage prior to fibre melt 38-44%, fibre length of 35-40 mm, with linear density of 0.12-0.17 tex. Share of coverage with polyester fibres equals 33.7-51.6 wt % of finished thread. Method for production of heat resistant sewing thread includes formation of at least two reinforced threads, their cabling, twisting into twisted thread, thermal fixation, application of preparing composition. At the same time, during formation of reinforced thread, polyester fibres are thinned with drawing multiple to 24-32 into broken thread of linear density of 6.4-13.4 tex, in zone of twisting triangle, core is pulled with force that exceeds force of broken thread drawing 2.2 times.

EFFECT: invention provides for increased strength and heat resistance of sewing threads with preservation of tension, resistance to bends and sewing properties.

4 cl, 4 dwg, 5 tbl