Pipe molding apparatus with air assist of plastic onto cooling p

Details Pipe molding apparatus with air assist of plastic onto cooling p Pipe molding apparatus with air assist of plastic onto cooling p

1998-03-31

2000-12-05

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

425336, 425384, 4253871, 425392, 425396, 425464, B29C 4790

Patent

active

061558133

ABSTRACT:
A pipe molding apparatus for forming double walled plastic pipe comprises an extruder which feeds first and second parisons of flowing plastic material to a moving mold tunnel to make respectively the outer and inner walls of the pipe. The moving mold tunnel includes a cooling plug over which the second parison moves to form the inner pipe wall while the outer wall of the pipe is formed against the interior surface of the mold tunnel. An air assist is provided internally of and helps to move the inner parison onto the cooling plug.

REFERENCES:
patent: 4510013 (1985-04-01), Lupke et al.
patent: 5320797 (1994-06-01), Hegler et al.
patent: 5405569 (1995-04-01), Lupke

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