Multi-task machines for the manufacture of synthetic silk.
Part 1. Recent advances in the integration of the manufacturing machines
Various improvements in the process of synthetic silk manufacture due to the elimination of many steps and operations have been presented. These include the reduction of monomer and oligomers content in raw polyamide silk and resigning from hydrothermal treatment of twisted polyamide-6 and poly(ethylene terephthalate) silk in favour of the thermal fixation both during the two-stage formation (fibre spinning with subsequent stretching) and during the one-stage formation (fibre spinning with simultaneous stretching). The modifications in the design of fibre-forming machines (melt-spinning-take-up machines) have been presented. These changes aim at taking-over by these machines the operations performed by corresponding specialized machines. This let to the construction of automatic and more reliable universal machines coping with much higher take-up velocities, up to 6000 m/min.
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