Skinned double wall pipe and apparatus for making same

Details Skinned double wall pipe and apparatus for making same Skinned double wall pipe and apparatus for making same

1994-11-10

1996-08-06

Nguyen, Khanh P.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

425141, 425462, 425466, B29C 4706, B29C 4722, B29C 4726

Patent

active

055428347

ABSTRACT:
An extrusion die for making skinned double wall pipe has an elongated tubular body into which flowing plastic is injected. The tubular body has first and second plastic flow channels in which the first flow channel guides the flowing plastic to a first extrusion orifice in the die for making outer pipe wall and the second flow channel guides the flowing plastic to a second extrusion orifice in the die for making the inner pipe wall. The die also includes an injection opening to at least one of the plastic flow channels through which further plastic is injected to form the skin on the pipe.

REFERENCES:
patent: 2957201 (1960-10-01), Fields et al.
patent: 4249875 (1981-02-01), Hart et al.
patent: 4629650 (1986-12-01), Kataoka
patent: 4789327 (1988-12-01), Chan et al.
patent: 5108682 (1992-04-01), Tompkins et al.
patent: 5320797 (1994-06-01), Hegler et al.

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