Abstract: In the method, an upper mould is fixed on an upper portion of a base body, and a lower mould is provided. When the primary molding is performed, the lower mould moves up at a different speed. The beads are drilled during the primary molding. After the primary molding, the lower mould moves down slightly. Gases generated while a material for the beads is cured are discharged, and the lower mould moves up to secondarily mold the beads. The lower mould is positioned on a pin plate fixed to a piston shaft of a cylinder. Semi-circular recesses of the lower mould are provided with pin holes. While pins fitted into the pin plate enters into and exits from the pin holes, the beads are drilled. The pin plate moves down by descent of the lifting plate, and thus the pins escape from the molded beads.

Abstract: A method for coating thermoplastic resin beads for use in imitation pearls includes the steps of: applying to celluloid a surface treatment compound (A) dissolved into a mixed solution of acetone, ethylacetate, butylacetate, and benzene; coating the surface treated celluloid with compounds for an under coat and a mid coat, each compound being obtained by dissolving celluloid into a mixed solution of ethylacetate and amylacetate, and adding a pigment thereto; and coating the celluloid with a compound for a top coat (D) that is prepared by dissolving celluloid into ethylacetate, and adding a pigment thereto.

Abstract: A method for coating thermoplastic resin beads for use in imitation pearls includes the steps of: applying to celluloid a surface treatment compound (A) dissolved into a mixed solution of acetone, ethylacetate, butylacetate, and benzene; coating the surface treated celluloid with compounds for an under coat and a mid coat, each compound being obtained by dissolving celluloid into a mixed solution of ethylacetate and amylacetate, and adding a pigment thereto; and coating the celluloid with a compound for a top coat (D) that is prepared by dissolving celluloid into ethylacetate, and adding a pigment thereto.

Abstract: The present invention relates to compounds for an under coat (A), a mid coat (B) and a top coat (C) of the imitation pearl, in which the compounds for the under and mid coats (A) and (B) of the imitation pearl are prepared by dissolving pyroxylin into a mixed solution of acetone and ethylacetate and another mixed solution of butylacetate and amylacetate, and adding a pigment to the pyroxylin solution, and the compound for the top coat (C) of the imitation pearl is prepared by dissolving pyroxylin into a mixed solution of ethylacetate and butylacetate and adding a pigment to the pyroxylin solution.