PLASTIC INJECTION MOLD AND METHOD FOR INJECTION MOLDING PLASTIC USING THE MOLD

摘要

PROBLEM TO BE SOLVED: To carry out the improvement in the transfer rate by suppressing the temperature distribution irregularity to a specified range and reduce or delete the molding failure. ;SOLUTION: This plastic injection mold comprises a plurality of channels 8 near the cavity 7 of the mold to feed a heating medium to the plurality of channels 8. In this case, pressure water or cooling water at 100°C or higher at a specified flow rate is fed to the channels 8 to abruptly raise the temperature of the wall surface of the cavity 7, rapidly cooled and further the water surface distance ratio Kt obtained by the general formula (wherein the distance from the wall of the cavity 7 to the wall of the channel 8 is Y, the diameter of the channel 8 is (d) and the pitch distance is P) is set to 2.0 or less or preferably 1.5 or less. Thus, the temperature distribution irregularity of the mold wall surface is suppressed to the range which does not interfere in practical use.;COPYRIGHT: (C)1997,JPO