Abstract: A foam composite with a skin formed in one shot by charging plastic powders or minute particles together with polyolefin pellets that can be cross-linked and foamed in a mold, and heating the mold while rotating. The composite absorbs almost no moisture, having satisfactory strength, being excellent as an insulating material. Further, providing a covering of a non-foaming or a slightly foaming material to the pellet of polyolefin that can be cross-linked and foamed, and conducting the forming, foamed granules as a core, and a covering of a reinforcing member for the core.

Abstract: A foam composite with a skin formed in one shot by charging plastic powders or minute particles together with polyolefin pellets that can be cross-linked and foamed in a mold, and heating the mold while rotating. The composite absorbs almost no moisture, having satisfactory strength, being excellent as an insulating material. Further, providing a covering of a non-foaming or a slightly foaming material to the pellet of polyolefin that can be cross-linked and foamed, and conducting the forming, foamed granules as a core, and a covering of a reinforcing member for the core.

Abstract: Plastic foam has excellent heat insulation properties, however, moisture absorption is causing a decrease in the heat insulation, and plastic foam has almost no mechanical strength. Therefore, a heat insulation material that absorbs almost no moisture and has satisfactory strength is desired to appear. According to the present invention, a foam composite with a skin can be formed in one shot by charging plastic powders or minute particles together with polyolefin pellets that can be cross-linked and foamed in a mold, and heating the mold while rotating. The composite absorbs almost no moisture, having satisfactory strength, being excellent as an insulating material. Further, providing a covering of a non-foaming or a slightly foaming material to the pellet of polyolefin that can be cross-linked and foamed, and conducting the forming, foamed granules of preferably 5 to 50 mm largeness as a core, and a covering of a reinforcing member with 0.05 to 0.

Abstract: Plastic foam has excellent heat insulation properties, however, moisture absorption is causing a decrease in the heat insulation, and plastic foam has almost no mechanical strength. Therefore, a heat insulation material that absorbs almost no moisture and has satisfactory strength is desired to appear. According to the present invention, a foam composite with a skin can be formed in one shot by charging plastic powders or minute particles together with polyolefin pellets that can be cross-linked and foamed in a mold, and heating the mold while rotating. The composite absorbs almost no moisture, having satisfactory strength, being excellent as an insulating material. Further, providing a covering of a non-foaming or a slightly foaming material to the pellet of polyolefin that can be cross-linked and foamed, and conducting the forming, foamed granules of preferably 5 to 50 mm largeness as a core, and a covering of a reinforcing member with 0.05 to 0.

Abstract: This invention provides a method of continuously manufacturing a cross-linked polyvinyl chloride resin foam sheet which has a low density, uniformly fine cell, excellent thermal moldability and high heat resistance and is neither deformed nor deteriorated even by long storage characterized by uniformly kneading the polyvinyl chloride resin with a blowing agent, stabilizer, plasticizer and cross-linking promoter without causing the blowing agent to decompose itself, thereby providing an unfoamed kneaded composition in which the polyvinyl chloride resin is gelled and forming said composition into a continuing sheet, irradiating said sheet with ionizing radiation to cross-link the resin; and thermally foaming the cross-linked sheet.

Abstract: A tough board of thermoplastic resin foam provided with skin layers on both surfaces thereof and formed of large cells elongated in the direction of the thickness of said board, wherein an intermediate high density layer thicker than 0.1mm lies substantially halfway between the upper and lower surfaces of said board. The board is formed by extruding thermoplastic resin containing dissolved foaming agent as a sheet, cooling the upper and lower surfaces rapidly to form solid skin layers and then slowly cooling while allowing controlled expansion thereof between expansion restricting members.

Abstract: A method of manufacturing a foamed polyolefin sheet which comprises the steps of laminating a film of noncross-linked thermoplastic resin free from a cross-linking agent to at least one surface of a cross-linked polyolefin base sheet containing a thermally decomposable foaming agent or a polyolefin base sheet containing the above-mentioned foaming agent and a cross-linking agent, and carrying out the thermal foaming of said film-fitted sheet while placing it on a supporting member under atmospheric pressure with the film-laminated surface of the polyolefin sheet being in contact with said supporting member.

Abstract: A method of molding plastics material which comprises the steps of feeding plastics material into an extruder for softening and mixing; extruding the mixed mass in the form of a rod having a diameter of at least 15 mm through an extruder die; charging the extruded mass into a metal mold whose inner walls are provided with grooves to attain the smooth movement of plasticized resin; and compression molding the extruded mass while being plasticized to form a molded product.

Abstract: A method of manufacturing foamed moldings having a compartment-structure therein, the average wall thickness of all compartments being at least 0.1 mm, which comprises heating an aggregate of foamable materials, each comprising a layer of plastics or rubber, capable of forming the said compartment wall whereby the foamed materials are bonded with one another at the layer thereof to form an integrated foamed molding.

Abstract: The present invention provides a foamable polyolefin composition comprising a polyolefin, a crosslinking agent, a blowing agent decomposable at temperatures higher than the decomposition temperature of said crosslinking agent and a gas trapping agent as well as a method for manufacturing foamed polyolefin from said foamable polyolefin composition.