Patent ID: 6555195
Filing Date: 2003-04-29
Classification: B29C,B29D,B29K,G11B,Y10T

Abstract:
A mold apparatus, suitable as a component of an injection-molding or compression-molding machine, for injection molding or compression molding of information-carrying disk blanks of polymethacrylate plastic, the mold apparatus comprising two mold parts, wherein one mold part contains a female die with the information data and together with the second mold part forms a cavity for the one information-carrying disk blank, a sprue bushing for a sprue piece with a centrally positioned gate, and an impact cylinder for shearing the sprue piece in the apparatus and an ejector pin are also provided,wherein the injection gap between the gate of the sprue piece and the information-carrying disk blank is smaller than 0.3 mm and the cutting gap between the rim of the impact cylinder and the information-carrying disk blank is smaller than 0.2 mm, and wherein the stroke of the impact cylinder is 0.3 to 1.3 mm.