B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/00 (2006.01) B29C 47/12 (2006.01) B29C 47/20 (2006.01) B29D 23/00 (2006.01) B29C 47/56 (2006.01) B29C 49/00 (2006.01)
Patent
CA 2485798
Die apparatus configured for forming corrugated pipe from thermoplastic material in association with transported wall mold sets defining a wall forming tunnel. The apparatus employs two homogenizer stations, a first at its entrance for providing homogenized material to an outer wall delivery channel extending to an outer wall extrusion nozzle. Plastic material is delivered under pressure along a heated internally disposed extender pipe to a liner homogenizer stage located downstream and feeding a liner extrusion nozzle. An access region is made available between the outer wall extrusion nozzle and the liner extrusion nozzle.
Cyphert David L.
Karr Gary L.
Mcfadden Fincham
Modern Machine Corporation
Quality Culvert Inc.
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