Patent ID: 7014447
Filing Date: 2006-03-21
Classification: B29C

Abstract:
1. An extruder for welding plastic components, having a front part for plasticizing and ejecting additional plastic welding material, and a rear part for feeding in a feeding direction and breaking up a continuous filament made of said additional plastic material; said rear part comprising: at least one feed channel and a worm screw arranged therein, said at least one feed channel being delimited by a thread of said worm screw on a first side thereof and by a sliding surface for said filament on a second opposite side thereof, and wherein a distance between said sliding surface and a crest of said thread decreases in the feeding direction along which said filament is fed, in order to provide scoring of increasing depth on said filament, said thread comprising at least one discontinuity of the worm thread that has a sharp discontinuity end for cropping said filament at said scoring.