Extrusion apparatus and method with pressure equalization

Details Extrusion apparatus and method with pressure equalization Extrusion apparatus and method with pressure equalization

B - Operations, Transporting

29

C

B29C 47/06 (2006.01) B29C 47/56 (2006.01) B29C 47/68 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2168273

An extrusion apparatus and method for producing a composite profile strip characterized by an extrusion head having plural flow channels extending to an extrusion die and at least two extruders for feeding respective components at respective different pressures into the flow channels for passage to the extrusion die. The extrusion die has a common die outlet from which the components are discharged to form the composite profile strip, and respective flow restriction devices are disposed in the flow channels between the extruders and the extrusion die. The flow restriction devices are operative to decrease the difference in pressure between the components before being brought together at the extrusion the extrusion die and further to dampen the effect changes in extruder speed has on the profile of the composite profile strip.

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