SHAPING TOOL FOR INFORMATION CARRIER DISC BLANKS

摘要

The invention relates to a shaping tool for the injection molding or injecti on compression of information carrier disc blanks (11) made of polymethacrylate plastic which is suited as a component of an injection molding or injection compression machine. The shaping tool is comprised of two mold parts (1, 2), whereby one mold part (1) contains a bottom part (8) of a mold with the information data and, together with the second mold part (2), forms a cavity for the one information carrier blank and one sprue bush (4) for a sprue pie ce (5) in the tool having a concentrically positioned feed orifice (6). In addition, the tool comprises a impact cylinder (9) for shearing the sprue piece (5) and has an ejector pin (10). The invention is characterized in tha t the injection gap (SP) between the feed orifice (6) of the sprue piece (5) a nd the information carrier disc blank (11) is less than 0.3 mm. In addition, th e cutting gap (SN) between the edge of the impact cylinder (9) and the information carrier disc blank (11) is less than 0.2 mm.