Twin-nozzle extrusion head

Details Twin-nozzle extrusion head Twin-nozzle extrusion head

B - Operations, Transporting

29

C

18/756

B29C 47/26 (2006.01) B29C 47/02 (2006.01) B29C 47/06 (2006.01) B29C 47/28 (2006.01)

Patent

CA 1203961

ABSTRACT A twin-nozzle extrusion head includes basically three axially spaced but radially overlapping annular housing members, together establishing two nozzle gaps. A first and a middle one of the two members are provided with annular feeder ducts for these nozzles Each duct has on its exit side a baffle ring, one baffle ring being effective on its radially inner surface while the second baffle ring is effective on its radially outer surface of larger diameter. These surfaces are non-circular in a predetermined manner to establish nonuniform gap widths related directly to the location of feed ducts for the annular channels. Generally, the gaps are wider in locations out of proximity to the feed ducts. The nozzle gaps are both frustoconical and of different steepness and terminate in a common plane. The nozzles are particular- ly provided for disposing an adhesive on top of a steel pipe and a polyethylene coating and envelope on top of the adhesive.

416454

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