METHOD FOR THE CONTINUOUS PRODUCTION OF SHEETS OF THERMOPLASTICS MATERIAL

摘要

A process for the continuous manufacture of sheeting from thermoplastic synthetic resins includes the steps of applying thermoplastic synthetic resin, in the form of particles, such as shreds, crumbs, cuttings, pieces, chips, or the like, continuously as a sheet-like layer of raw material to a moving support; passing the raw material layer through a heating zone to thereby preheat the material layer to a temperature approximately in the range from 100 DEG to 140 DEG C.; pressing the preheated material layer continuously over its full area during travel through a treatment zone so that, in a first phase, the raw material layer is compacted and welded under the effect of a pressure of from about 10 to 60 kp/cm2 and at the same time the material layer is heated to a temperature in the range from about 160 DEG to 220 DEG C; and, in a second, directly following phase, while maintaining said pressure, cooling the material layer and simultaneously pressing the layer to the thickness dimension predetermined by the amount of raw material layer applied to the moving support.