▎ 摘　　要

NOVELTY - Method for preparing oriented heat conducting sheet involves preparing a fluid composition for a heat conducting sheet, placing the fluid composition in an orientation molding device, applying circumferential shear force to the fluid composition layer by layer to enable thermal conducting fillers in the fluid composition to be oriented along shear direction to form oriented thin-layer composition (7), collecting thin-layer composition layer by layer in a die (9) to form continuous multilayer aggregate (8), heat-curing the continuous multilayer aggregate to obtain an oriented composition block, and slicing the oriented composition block along a direction perpendicular to an orienting direction of the oriented composition block, where the orientation molding device has a cylindrical rotating barrel (2), a sleeve barrel (3), where the sleeve barrel is sleeved outside the cylindrical rotating barrel, the die provided with inner cavity and its opening, and an electric heating module (13). USE - Method for preparing oriented heat conducting sheet used in semiconductor heat dissipating device (claimed). DETAILED DESCRIPTION - Method for preparing oriented heat conducting sheet involves preparing a fluid composition for a heat conducting sheet, placing the fluid composition in an orientation molding device, applying a circumferential shear force to the fluid composition layer by layer to enable thermal conducting fillers in the fluid composition to be oriented along a shear direction to form an oriented thin-layer composition, collecting the thin-layer composition layer by layer in a die to form a continuous multilayer aggregate, heat-curing the continuous multilayer aggregate to obtain an oriented composition block, and slicing the oriented composition block along a direction perpendicular to an orienting direction of the oriented composition block, where the orientation molding device has a cylindrical rotating barrel, where a rotating shaft (5) is fixed on a central axis of the cylindrical rotating barrel, one end of the rotating shaft is provided with a first motor (6), the first motor drives the cylindrical rotating barrel to rotate via the rotating shaft, the cylindrical rotating barrel is provided with a loading zone (1) and a rotating barrel opening is provided at a lower side of the loading zone, a sleeve barrel, where the sleeve barrel is sleeved outside the cylindrical rotating barrel, the cylindrical rotating barrel is configured to rotate inside the sleeve barrel and a sleeve barrel opening with a same size as the rotating barrel opening is arranged at an end of the sleeve barrel opposite to the rotating barrel opening, the die, where the die is provided with an inner cavity and an inner cavity opening, an edge of the inner cavity opening is flush with and next to an edge of the sleeve barrel opening, the edge of the inner cavity opening extends inwardly along a horizontal direction perpendicular to the central axis of the cylindrical rotating barrel to form a side wall of the inner cavity, a piston (12) and a second motor (11) are provided next to the side wall of the inner cavity, the second motor is configured to drive the piston away from the sleeve barrel opening and a starting position of the piston is flush with the sleeve barrel opening, and an electric heating module, where the electric heating module is configured to heat the inner cavity of the die, there is a gap (14) of 0.1-5 mm between the cylindrical rotating barrel and the sleeve barrel and the piston is driven by the second motor to leave the sleeve barrel opening intermittently. INDEPENDENT CLAIMS are included for: (1) the oriented heat conducting sheet prepared by the preparation method; and (2) a semiconductor heat dissipating device, which includes the oriented heat conducting sheet, where the oriented heat conducting sheet is sandwiched between a packaged chip and a radiator. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of the orientation molding device. 1Loading zone 2Cylindrical rotating barrel 3Sleeve barrel 5Rotating shaft 6First motor 7Oriented thin-layer composition 8Multilayer aggregate 9Die 11Second motor 12Piston 13Electric heating module 14Gap