Intermittent multi-layer multi-parison extrusion head

Details Intermittent multi-layer multi-parison extrusion head Intermittent multi-layer multi-parison extrusion head

B - Operations, Transporting

29

C

B29C 47/26 (2006.01) B29C 47/06 (2006.01) B29C 47/22 (2006.01) B29C 47/92 (2006.01)

Patent

CA 2094877

ABSTRACT OF THE DISCLOSURE A multi-layer, multi-parison extrusion head in which nearly identical parisons are extruded from each extrusion station of the head when operated in an intermittent mode. Resin passages are provided within the extrusion head for supplying each of the resins to each extrusion station with the passages configured in a manner such that the ratio of resin volume for one resin in the passages for a given extrusion station compared to the volume of a second resin in the flow passages to the same extrusion station is the same for all extrusion stations while the volumes of resins feeding each station are not equal. As a result, a relatively simple configuration of passages is provided without requiring all of the passages to be of equal length.

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