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United States Patent 6102560
Douris , ê et al.

Screw tip for closing a temperature-control bore of an extruder screw

Grimm , Ê et al. August 15, 2000

Abstract

An extruder screw, includes a head portion having a front end and having formed therein a temperature-control bore and a counterbore extending the bore to the front end for supply and drainage of a fluid. A locking screw has a screw thread, with a first section of the screw thread received in the bore and a second section of the screw thread extending in the counterbore and projecting out of the head portion. The extruder screw further includes a screw tip which threadably engages the second section of the screw thread to close off the extruder screw, and a sealing member which is received in a counterbore of the head portion, wherein the locking screw is so configured as to apply a substantial force against the sealing member when engaging the locking screw into the bore, to thereby effectively seal the bore.