Patent ID: 6237208
Filing Date: 2001-05-29
Classification: B27N,B29C,B29D,E06B,Y10S,Y10T

Abstract:
A process for the production of section material, comprising:a) providing a first blending component comprised of thermoplastic plastics waste;b) providing a second blending component with a content of additives;c) thoroughly mixing and compacting the first and second blending components by thermally plasticising said first blending component, with said second blending component added thereto, to form a strand-forming mixture;d) supplying the strand-forming mixture to a point of influx;e) from said point of influx, introducing the strand forming mixture into a distribution mains connected to a plurality of preliminary section forming ducts via a corresponding plurality of connecting valves, said distribution mains having an inflowing end for the strand-forming mixture, an end remote from said inflowing end and a longitudinal extent therebetween, said connecting valves being distributed between the inflowing end and the remote end in the longitudinal direction of said distribution mains;f) cleaning the distribution mains by opening a cleaning valve located at the remote end thereof;g) charging the plurality of preliminary section forming ducts connected to said distribution mains with the strand-forming mixture by opening the respective connecting valves successively beginning at the remote end of said distribution mains and progressing to the inflowing end; said strand-forming mixture being introduced, under pressure, into each preliminary section forming duct until the duct is filled up and the strand-forming mixture is shaped to form a thick-walled preliminary section;h) at least partially hardening the preliminary section by cooling;i) removing the preliminary section as a longitudinal part from the preliminary section forming duct with a length corresponding to the length of the preliminary section forming duct;j) providing a rest time for shrinkage of the preliminary section;k) after said rest time, shaping the preliminary section at least in part by machining at least part of the circumference of the preliminary section to form an intermediate section; andl) coating the intermediate section on at least a part of its section circumference with a surface finishing layer of coating material.