Methods of producing polyolefin foam sheets and articles made thereof
AssigneeToray Plastics (America), Inc.
InventorsJesse J. Baldwin, Gary H. Clark, Donald A. Foltz, Paul F. Geibler, Pawel Sieradzki
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Abstract
A method of manufacturing a polyolefin foam sheet composition includes extruding a polyolefin sheet, irradiating the extruded sheet to obtain a physically crosslinked sheet, foaming the physically crosslinked sheet with heat to obtain a foamed layer, and skiving the foamed layer to obtain a foam sheet with at least one skived surface. The surface roughness of the skived surface of the foam sheet is different from the surface roughness of an unskived surface.
Claims33
A method of manufacturing a polyolefin foam sheet composition comprising:
- (a) extruding a foaming agent and at least one polyolefin resin selected from the group consisting of a polypropylene and a polyethylene to obtain an unfoamed, extruded sheet;
- (b) irradiating the extruded sheet with ionizing radiation to obtain a physically crosslinked sheet;
- (c) foaming the physically crosslinked sheet with heat to obtain a foamed layer;
- and
- (d) skiving the foamed layer to obtain a foam sheet with at least one skived surface,
- wherein the skived surface of the foam sheet has a Sa of about 20 to about 150 μm and an Sz of about 250 to about 1000 μm.
A physically crosslinked polyolefin foam sheet comprising at least one polyolefin resin selected from the group consisting of a polypropylene and a polyethylene, wherein a surface of the physically crosslinked foam sheet is skived to obtain at least one skived surface and the skived surface of the foam sheet has a Sa of about 20 to about 150 μm and an Sz of about 250 to about 1000 μm.
Dependencies are inferred from the claim text.