Polymerisation From 6-carbon caprolactam to nylon 6 granules Polymerisation From 6-carbon caprolactam to nylon 6 granules 1: Polymerisation 2: Spin-Drawing & Texturing 3: Twisting & Heat-Setting Our ProductsOur InnovationYour PartnerOur StoryJobsOur teamPressContact The art of metamorphosis Home > Our Products > Polymerisation Back to products The process behind our core business explained. Got an inquiry? Contact us 1/ Polymerisation FROM CPL TO NYLON 6 POLYMERS A nylon 6 granule starts life as caprolactam (CPL), an organic compound that has 6 carbon atoms, hence the name. When caprolactam is heated to a set temperature in a nitrogen atmosphere, the reaction of step-growth polycondensation occurs, synthesizing a string of nylon 6 polymers. The trademark granules or chips are born when the PA6 string is cooled and then cut to size in a granulator, after which the pellets are drained, dried and stored. The caprolactam residue is extracted from the excess water and recycled back into the reactor, so nothing goes to waste. 2/ Stretching the point FROM TINY GRANULES TO TEXTURED YARNS First, the PA6 granules are smelted in an extruder. The molten polymer is then pumped into a spinning machine, which siphons precise volumes of the product through a filter system and a perforated spinneret. In a later stage of the extrusion process, the partially orientated filaments are air-quenched and pre-tensioned in a specially designed chute and converge into oiled yarns before being "drawn" (stretched) and spun to achieve the desired tensile strength, size and orientation. The morphology of the fibers will have a great effect on their ability to absorb dye at a later stage. After the spin-drawing, the yarn is primed for texturing. The thread is run through a special chamber filled with hot air. By creating an overfeed,the yarn is naturally crimped and goffered as it heats up on the go.. It is then sent to a cooling drum, which fixes in place the uniform texture and the structural features of the yarn—breathability, bulk, warmth, softness, opaqueness, stretch and shrink factor, and so on. Finally, the yarn is relaxed, entangled and automatically collected on cylindrical bobbins, which are replaced when fully wound. 3/ Forging the bond FROM TEXTURED YARNS TO HEAT-SET YARNS Twisting and Heat-setting: from textured yarn to finished product In the last station of our integrated production line, the bobbins are placed in a twisting machine, which uses the centrifugal force of rotation to ply together the individual strands as they are fed through the system. This twist enhances the dimensional stability and strength of the yarn, and gives it more substance. Heat-setting or thermal fixation, finally, is the process in which the twisted yarn is exposed to a carefully calibrated mixture of heat and humidity, which determines its torque and toughness, thereby improving the overall quality and performance of the finished product. Our Products Products Process Certificates Our Innovation R&D A tradition of innovation Your Partner Our promise Our Story History Vision & Mission Our Team Our team Our Jobs Press Nyobe Nv Groene Dreef 5 9770 Kruishoutem (Belgium) T. + 32 9 338 14 99 info@nyobe.Be © 2018 - NYOBE NV