Apparatus for applying foam coating to preformed pipe
AssigneeJoyce Western Corporation
InventorWilliam D. Parker
Life of this patent
Estimating the term…
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.
Claims10
Apparatus for coating a preformed pipe, comprising a rigid tubular sleeve adapted to be positioned around a pipe with an annular gap between the pipe and the inner wall of said sleeve, support means for said sleeve, drive means connected to said support means for moving said sleeve longitudinally relative to said pipe, means separate from said drive means for supplying a foamable composition to fill the gap between the pipe and said sleeve as said sleeve moves along said pipe and means cooperating with the inner wall of said sleeve to apply a layer of a sealant to the external surface of foam produced from said foam forming composition while within said sleeve.
Dependencies are inferred from the claim text.