Apparatus for making foam plastic pipe

Details Apparatus for making foam plastic pipe Apparatus for making foam plastic pipe

1974-12-13

1976-06-15

Husar, Francis S.

Plastic article or earthenware shaping or treating: apparatus

Diverse distinct type shaping means

Shaping orifice and either a downstream preform reshaping...

264 459, 264209, 425379R, 425380, 425404, 425467, 425817C, B29D 2304, B29D 2700

Patent

active

039634035

ABSTRACT:
An apparatus for extruding a tubular article from a cellular plastic compound comprising a bushing defining a passage extending therethrough, an internal mandrel within the passage of the bushing and cooperating therewith to define a die passage, and an external mandrel downstream of the internal mandrel. The die passage has a tapered section and an outlet section with the overall width of the tapered section reducing as it extends toward the outlet. The outlet section terminates in an outlet. The gap dimension of the tapered section is greater than the gap dimension of the outlet section. The die passage has a transition section which is of progressively reducing thickness to smoothly blend the tapered section and the outlet section.

REFERENCES:
patent: 3212135 (1965-10-01), Branscum
patent: 3229005 (1966-01-01), Reifenhauser
patent: 3393427 (1968-07-01), Larsen
patent: 3538209 (1970-11-01), Hegler
patent: 3560600 (1971-02-01), Gliniecki
patent: 3609809 (1971-10-01), Slicker
patent: 3702226 (1972-11-01), Kim et al.
patent: 3764642 (1973-10-01), Boutillier
patent: 3870451 (1975-03-01), Gokcen

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