PAPER-MACHINE FELT

摘要

The invention concerns a recondensed paper-machine felt consisting of a polyamid base fabric with a needled-in polyamide face layer, the felt having a relative viscosity in sulphuric-acid solution of at least 5 when determined in accordance with DIN 53 727. The invention also concerns a method of increasing the molecular weight of paper-machine felt, the felt being impregnated with a solution of recondensation catalysts, dried and subsequently thermally condensed in the solid phase in the absence of oxygen at a temperature below the melting point of the polyamide.