Method and apparatus for producing pipe with annular ribs

Details Method and apparatus for producing pipe with annular ribs Method and apparatus for producing pipe with annular ribs

1989-09-11

1991-06-11

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

264 407, 264508, 264167, 4253261, 425393, 425396, 425465, 425466, B29C 4722

Patent

active

050230298

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 tubing 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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