Title: Apparatus for applying foam coating to preformed pipe

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.

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Inventors: Parker, William D. (Tulsa, OK, US)

Application Number: 437766
Filing Date: 1974-01-30
Publication_date: 1976-03-02
Assignee: Joyce Western Corporation (Andover, NY)
Primary Class(es): 425/96 118/DIG11, 264/46.9, 425/113, 425/817C
Other Classes:
US Patent Ref:

2579815	Dec, 1951	Gialanella	425/97.
2581769	Jan, 1952	Olson	425/104.
3366719	Jan, 1968	Lueders	425/4.
3432582	Mar, 1969	Bender	425/817.
3709751	Jan, 1973	Carlson et al.	156/78.
3797981	Mar, 1974	Van Dijk	425/110.
3840384	Oct, 1974	Reade et al.	118/DIG.

Other Refs:
Primary Examiner: Baldwin, Robert D.
Assistant Examiner: Rosenbaum, Mark
Attorney: Laurence, Stokes & Neilan