Apparatus for producing pipe with annular ribs

Details Apparatus for producing pipe with annular ribs Apparatus for producing pipe with annular ribs

B - Operations, Transporting

29

C

18/759

B29C 47/32 (2006.01) B29C 47/12 (2006.01) B29C 47/92 (2006.01)

Patent

CA 1303315

ABSTRACT The invention concerns apparatus for molding thermoplastic tubing having solid annular ribs. The apparatus is of the type where a tubular mold is defined by cooperatively interengaged mold block of a pair of mold assemblies. An annular extrusion orifice for the tube extends into the mold tunnel and tubine is extruded about a mandrel. The invention provides an accumulator chamber in the region of the extrusion nozzle to provide for pressure differences which build up at that point. Thus, the effective volume of the accumulator chamber can compensate for the varying requirement for the thermoplastic material resulting from the varying radial wall thickness.

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