In injection molding, when gas generated from molten resin becomes deposited in the gas-vents of molds, burns and short-shot are formed on products. In this study, we developed a mold for evaluating gas-vent performance, and proposed a quantitative evaluation method of gas-vent performance by supplying a known gas to gas-vent grooves where mold deposits increase during continuous molding. We applied this method for gas-vent grooves with three kinds of gaps and quantitatively inspected the effective cross-sections of the gas-vent grooves by flow rate Q and time T when gas pressure was reduced by half. Furthermore, we applied this method to the continuous molding process and detected the changes in Q and T with shots, calculated the clogging ratio of the effective cross-sectional area of the gas-vent groove, and confirmed that changes in the gas-vent performance can be evaluated quantitatively.
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Research Article| February 05 2019
Measurement of gas-vent clogging ratio using evaluation mold of gas-vent performance
AIP Conf. Proc. 2065, 030042 (2019)
Eisaku Shimomura, Michihiro Tatsuno, Hidetoshi Yokoi; Measurement of gas-vent clogging ratio using evaluation mold of gas-vent performance. AIP Conf. Proc. 5 February 2019; 2065 (1): 030042. https://doi.org/10.1063/1.5088300
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