pictured in fig1 this thread is composed of a core 1 of six 6 basic threads made of poly p phenylene terephthalamide commercially sold by the e i dupont de nemours amp company under the trademark kevlar with the individual fineness of 1 670 decitex each basic thread composed of 1000 strands not allowing any torsion and a wrapping thread 2 composed of a polyester thread 440 decitex 100 strands zero 0 torsion turn per meter prior to the wrapping three 3 threads are formed the three threads being composed of a copolyamide 6 6 of 220 decitex 20 strands commercially sold under the name grillon by the grillon company the winding of the wrapping thread 2 is done in such a way that the spiral turns formed around the core are regular and joined ones this wrapping is made by 2000 turns per meter in an s direction the formed thread in which the grillon threads are firmly held between the core and the wrapping thread is wound and the formed bobbins are heat treated with steam at a temperature of one hundred five degrees centigrade 105 u00b0 c for thirty 30 minutes this operation of heat treatment achieves the fusion of the three threads made of grillon.