Extrusion machines

Details Extrusion machines Extrusion machines

B - Operations, Transporting

29

C

18/729

B29C 47/58 (2006.01) B29B 9/06 (2006.01) B29C 47/30 (2006.01)

Patent

CA 1056120

ABSTRACT OF THE DISCLOSURE A plastic extrusion machine having a screw rotatable in a chamber for plasticating and transporting plastic material. An annularly perforated wall is provided at one end of the cham- ber through which material is extruded. A collar is slidable on the end of the screw against a central portion of the wall in response to movement of material in the chamber towards the said wall forming a seal to prevent ingress of the material into a stagnant area between the end of the screw and the wall.

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