公开(公告)号：DE2455757A1

公开(公告)日：1976-06-10

申请号：DE2455757

申请日：1974-11-26

Applicant: BASF AG

Inventor： HEIL EDUARD DIPL ING ,  SMITS HARALD DIPL ING DR

IPC: B29B9/06 ,  B29B1/02

Abstract: A thermoplastic mass is granulated by extruding it through a nozzle plate into the chamber pressurised by gas and filled with fine droplets of fluid, of a water-ring cutter. On emerging from the nozzles, the thermoplastic is sheared off by cooled, rotating knives, the particles being superficially chilled, projected centrifugally into the ring of fluid set up on the inner wall of the chamber, and washed out by it. Unwanted cooling of the extrusion head is prevented by the continuous circulation across its face of a stream of gas picked up by the revolving knives and rid by centrifugal force, by any droplets of fluid. There is no adhesion between the granules or linkage by filaments. Excessive wear on knives and extrusion plate is avoided.