Apparatus for applying foam coating to preformed pipe

Details Apparatus for applying foam coating to preformed pipe Apparatus for applying foam coating to preformed pipe

1974-01-30

1976-03-02

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

With means applying coating material to work or work contact...

Separate means applying material directly to shaping means,...

118DIG11, 264 469, 425113, 425817C, B29F 310

Patent

active

039415317

ABSTRACT:
A foamable synthetic plastic composition such as a polyurethane is foamed in place around a pipe within a tubular former disposed concentrically about the pipe while the former moves longitudinally along the pipe. Conditions are regulated to form an external skin on the foam. A hot melt glue or similar composition is applied as an outer sealer onto the foam within the tubular former. Preferably a spiral wrapping of polyethylene film or the like is applied while the sealer is still hot and adhesive, and an aluminum jacket may be applied on top of the spiral wrapping.

REFERENCES:
patent: 2579815 (1951-12-01), Gialanella
patent: 2581769 (1952-01-01), Olson
patent: 3366719 (1968-01-01), Lueders
patent: 3432582 (1969-03-01), Bender
patent: 3709751 (1973-01-01), Carlson et al.
patent: 3797981 (1974-03-01), Van Dijk
patent: 3840384 (1974-10-01), Reade et al.

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