Mitsubishi Gas Chemical Company, Inc.

Mgc Filsheet Co., Ltd.

Masataka Sugiyama

Osamu Kakinoki

Masahide Takeda

Shotaro Ohno

Takeshi Onishi

A shaping roll for melt extrusion molding used for melt extrusion molding of thermoplastic resin, the shaping roll for melt extrusion molding comprises a metal roll body, a first cylinder, and a second cylinder. The metal roll body has a heat medium passage internally. The first cylinder covers a surface of a middle portion of the roll body part. The second cylinder covers surfaces of both end portions of the roll body part. The first cylinder comprises a first metal material having a thermal conductivity of 40 W/m&#xb7;K or more. The second cylinder comprises a second metal material having a thermal conductivity of 20 W/m&#xb7;K or less. The first cylinder and the second cylinder are at least partially joined to each other.

Shaping roll for melt extrusion molding, shaping roll assembly for melt extrusion molding, and melt extrusion molding method

An optical sheet is formed by laminating, by co-extrusion molding, a first layer containing a polycarbonate resin, a second layer containing a polyamide resin, and a third layer, wherein the second layer is laminated between the first layer and the third layer, the first layer and second layer, and the second layer and third layer can each be peeled at the interface, and the outer surface of the first layer has a fine grooved structure. The optical sheet, which is provided with a plurality of layers in such a way, is capable of retaining, a sufficient amount of heat in a laminate in a mold since the entire sheet can be made thick during melt extrusion molding, and is able to improve the transferability of the fine grooved structure. In addition, the optical sheet can be made thinner by using only the peeled first layer as an optical sheet.

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Saitama, Japan

Masataka Sugiyama