BUSH FOR AXIALLY RETAINING AND RADIALLY CENTERING MOTHER DIE IN INJECTION MOLDING TOOL

摘要

PURPOSE: To produce a disc-shaped data carrier having no stripes by discharging air compressed at a time of injection molding in the slight gap generated between the undersurface of a flange and the upper surface of a matrix according to circumstances. CONSTITUTION: A bush 1 has a conical adapting surface 2, a conical centering range 3 and a flange 4 equipped with an outer edge part 5 and an undersurface 6. A matrix 7 equipped with an upper surface 8 and a hole 9 is held on a mirror surface plate 10 by the bush 1. A gap is allowed to remain between the undersurface 6 of the flange 4 and the upper surface 8 of the matrix 7. A compact disk(CD) equipped with a laminating projected part is placed on the bush 1 and the matrix 7. The upper surface of the CD 12 is formed by the mirror surface plate 14. Further, a passage 17 has a collecting passage 19 and a collecting conduit 20 to advantageously discharge compressed air.