公开(公告)号：DE3615609A1

公开(公告)日：1987-11-12

申请号：DE3615609

申请日：1986-05-09

Applicant: BASF AG

Inventor： PFLEGER KLAUS DR ,  BOETTCHER KLAUS DR ,  KURSAWE SIEGFRIED ,  KANNE FRIEDRICH DR ,  ARNOLD GERHARD ,  GLOMB HANS ,  SCHIERLING HELMUT

IPC: B29C47/08 ,  B29C48/76 ,  B29C47/76

Abstract: Screw extruder for removing gaseous constituents from plastic materials, comprising a screw surrounded by a barrel with a feed opening for the materials to be treated, a drive unit and a degassing device arranged between the feed opening and the drive unit. The degassing device is formed by a stuffing box housing (4), which covers over and seals off the screw (2), is connected positively and non-positively to the barrel (1) and has on its inner wall (6), on the side facing the barrel, a spiral groove (7) running counter to the cut of the screw, and adjoining the said spiral groove an eccentric annular chamber which has one or more openings. The said screw extruder is characterised in that a defined amount of paraffin oil is pumped into the spiral groove of the degassing ring.