HIGH-RELATIVE VISCOSITY FILAMENTS, AND APPLIANCES AND PROCESSES FOR MANUFACTURING RELATIVE HIGH-VISCOSITY POLYAMIDE SCAMS AND FILAMENTS.

摘要

Apparatus for solid phase polymerization of polymer scales having a polyamidation catalyst dispersed within the scales and a relative viscosity referred to formic acid of 40 to 60 based on putting the scales in contact with inert gas practically free of oxygen, said comprising apparatus: a solid phase polymerization assembly to increase the relative viscosity of the scales, the assembly having: a container with a scale inlet to admit the scales, a scale outlet to remove the scales after they have been subjected to polymerization in solid phase, a gas inlet to admit gas; a gas system to make the gas circulate through the interstices between the scales in the container, the gas system having: a filter to separate and remove dust and / or polymer fines from the gas, a gas blower to circulate the gas, a heater to heat the gas, and a first conduit that connects in series and successively the gas outlet, the filter, the blower, the heater and the gas inlet; and a regenerative drying system with two desiccant beds connected in series that is connected in parallel with the first duct between the blower and the gas inlet, the drying system being to decrease the dew point temperature of at least a part of the circulating gas such that the dew point temperature of the gas at the gas inlet is no more than 20 ° C, whereby a solid state polymerization of the scales takes place which increases its relative viscosity relative to the formic acid while the gas circulates through the interstices between the scales thereby establishing contact with them in the container at a temperature of 120 ° C to 200 ° C for a period of time from 4 hours to 24 hours, after which they can be removed by the output of scales, scales that have a relative viscosity referred to formic acid of at least 90.