B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
18/738
B29C 47/22 (2006.01)
Patent
CA 1304900
ABSTRACT OF THE DISCLOSURE An extruder die head for extruding profiles, particularly plastic pipes. The die head includes an inner mandrel and an outer sleeve, between which is defined a flow channel. Adjacent the outlet of the die head, the flow channel defines an outlet flow zone that tapers inwardly toward the axis of the die head to define a converging flow passage, and at a point upstream of the outlet flow zone the flow passage diverges outwardly in the direction of material flow, to provide a pressure balance zone whereby the axial pressures acting on the outer sleeve are in opposite directions to substantially offset each other. The outer sleeve is axially movable relative to the mandrel by means of an external thread that engages with a rotatable adjusting sleeve that is driven through a gear train by a drive motor. The outer sleeve is restrained from rotation relative to the mandrel, and is movable only in an axial direction relative thereto. The outlet flow zone is defined by a pair of opposed curved surfaces that are preferably circular arcs and that flare inwardly toward the die head axis so that the material that passes through the outlet flow zone flows in a direction generally tangential to the axis of the die head to provide a smooth, substantially tangential flow path at the die head outlet.
549840
Borden Ladner Gervais Llp
Cincinnati Milacron Inc.
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