PRESS MOLD FOR PRESSURE DIE CASTING OF DISK-SHAPED PLASTIC PRODUCTS WITH CENTRAL OPENING Russian patent published in 1997 - IPC

FIELD: production of disk-shaped plastic products. SUBSTANCE: press mold has heating devices for keeping basic material in channel 10 in plastic state. First heating device 23 is formed as shell positioned concentrically with respect to sleeve 9. Second heating device 27 is positioned about block 26 of pouring basin 16, which has slightly inclined conical surface positioned in zone below pouring input gate 13 and adapted to prevent central opening wall of product from damage during opening of press mold. Inlet pouring gate 13 may be made in the form of openings positioned circumferentially of sleeve 16 or in the form of annular opening positioned about sleeve 16. EFFECT: increased efficiency, simplified construction and improved quality of plastic products. 11 cl, 5 dwg