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Degradation Processes in Production of Vidlon Polycaproamide Cord Thread

“…As a result of oxidation, the chemical composition and physicochemical properties of PCA change [2]. During oxidation that takes place according to a radical chain mechanism [3], stable chemical crosslinks are formed [4], which worsens the quality indexes of the polymer and correspondingly the fibres made from it.In preparation of the polymer for spinning at the polyamide fibre plant in Vidin, PCA crumb is oxidized immediately after the molten polymer flows out of the pouring unit of the polymerization apparatus and in drying at 160°C in nitrogen medium in fluidized bed driers (FBD plants own design [5,6]). In addition to thermooxidative processes, thermal degradation also takes place in the polymer during drying, primarily because of the severe temperature conditions and design flaws in the FBD, since these driers have dead zones.…”

“…In preparation of the polymer for spinning at the polyamide fibre plant in Vidin, PCA crumb is oxidized immediately after the molten polymer flows out of the pouring unit of the polymerization apparatus and in drying at 160°C in nitrogen medium in fluidized bed driers (FBD plants own design [5,6]). In addition to thermooxidative processes, thermal degradation also takes place in the polymer during drying, primarily because of the severe temperature conditions and design flaws in the FBD, since these driers have dead zones.…”