Extrusion coating method with polyolefin foam

Details Extrusion coating method with polyolefin foam Extrusion coating method with polyolefin foam

B - Operations, Transporting

29

C

18/642

B29C 47/02 (2006.01) B29C 44/32 (2006.01)

Patent

CA 1088383

ABSTRACT OF THE DISCLOSURE A procedure is disclosed for continuous extrusion coating by the use of a coating die of a hollow core material with a highly expanded polyolefin composition containing a volatile organic liquid blowing agent, the improvement comprising externally, cooling the outer surface of the extruded molten mass of expandable polyolefin resin, at the point at which the molten mass begins to foam, by by contacting the surface with a cooling gas or water to allow the pressure of foaming to be exerted inwardly and also to cause the growth of foam to proceed in the direction of the internal core for thereby enabling the poly- olefin foam to adhere fast to the hollow core and giving rise to a coating hav- ing a smooth surface condition, wherein the expanded polyolefin foam has an ex- pansion ratio of not less than 3. This thereby enhances the fastness of ad- hesion of the highly expanded polyolefin foam with the hollow core material and at the same time facilitates the release of the two materials thus joined.

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