Sekisui Chemical Co., Ltd.

Masanori Hirata

Masashi Okabe

Koji Yamaguchi

Katsuo Matsuzaka

Michitaka Tsujimoto

Masafumi Ishiyama

A polyolefin resin drawn sheetis laminated on at least one face of a sheet-form core materialhaving a density of 30 to 300 kgf/m. At this time, a sheet or filmmade of a bonding synthetic resin or rubber having a flow starting temperature lower than the thermal deformation temperature of the core materialand the melting point of the drawn sheetis interposed between the core materialand the drawn sheet. The resultant stack product is heated to not less than the flow starting temperature of the synthetic resin or the rubber and not more than the thermal deformation temperature of the core materialand the melting point of the drawn sheet. At the same time of or after the heating, the stack product is pressed to apply a compression strain of 0.01 to 10% to the core material

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Osaka, Japan

Masanori Hirata