Patent ID: 6582640
Filing Date: 2003-06-24
Classification: B27N,B29C,B29K,C10L,Y02E,Y10T

Abstract:
A process for the continuous production of a mat which is a preform for sheets, made from a mixture composed of fibers and/or pellets which break down to give fibers made from cellulose or from wood and one or more hot-curing resins, comprising the steps of(a) mixing from about 50 to about 90% by weight of fibers having a bulk density of from about 50 to about 300 kg/m3 and/or pellets with a bulk density of from about 400 to about 500 kg/m3 with from about 10 to about 50% by weight of hot-curing resin, where each of the percentages by weight is based on the total weight of the mixture, (b) kneading and homogenizing the mixture and passing the mixture onward to an extruder, (c) heating the mixture in the extruder to an extruder exit temperature at which the resin begins to cure, (d) extruding the mixture, which has not entirely cured, as a homogeneous composition and distributing the homogeneous composition within a calender line, (e) exerting pressure onto the homogeneous composition in the calender line, to an extent which gives a mat which is a preform, and (f) removing the preform and stabilizing a desired shape.