Abstract: A multi-layer sheet of the present invention comprises a thermoplastic resin foam sheet, a reinforcing sheet layered on integrated with at least one side of the thermoplastic resin foam sheet; the reinforcing sheet being formed by a non-woven fabric which comprises non-meltable fibers which are interwound with one another and which are bound together with a thermoplastic resin, the thermoplastic resin foam sheet having an aspect ratio Dz/Dxy of bubbles of 1.2 or more, and an expansion ratio of 5˜50 cc/g, and therefore the sheet is excellent in bending strength, compressive strength, thermo-forming property and dimensional stability as well as lightweight property, and so can ideally be used for an upholstery material for vehicles, a heat-insulation material, a buffer material and the like.

Abstract: An object of the present invention is to provide a composite foam having a high compressive strength. A polyolefin resin is melted and kneaded with a modifying monomer to react them. A thermally decomposable chemical foaming agent is added to the obtained modified resin, and the mixture is kneaded. The obtained foamable resin composition is shaped into a sheet. A sheet-like facing material (3) having a strength sufficient to inhibit the foamable sheet from expanding in in-plane directions during thermal foaming is laminated on at least one side of the foamable sheet. The obtained foamable composite sheet is thermally foamed to produce a composite foam (1) having rugby-ball-shaped cells (2) oriented in the direction of the sheet thickness.

Abstract: An object of the present invention is to provide polyolefin resin composite laminates prepared only from polyolefin resin materials which are environmentally friendly and flexible, the laminates being lightweight, having high rigidity, remaining free of decay, showing no dimensional variations if subjected to temperature or humidity variations and being amenable to recycling. A polyolefin resin is reacted with a modifying monomer to modify the resin. A chemical blowing agent is added to the modified resin obtained, followed by kneading. The resulting expandable resin composition is shaped into a sheet. A facing material is laminated to one surface of the expandable sheet obtained, the facing material having a strength capable of inhibiting the sheet from expanding in in-plane directions when the sheet is heated for expansion. The expandable sheet is heated for expansion to obtain a polyolefin resin composite laminate.