Method for preventing occurrence of impact pressure in injection molding machine
AssigneeNissei Plastic Industrial Co., Ltd.
InventorsKenichi Shimizu, Masahiko Miyajima, Daiki Tanemura
Life of this patent
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Abstract
Gas (air) is supplied into an oil transfer line extending between a front oil chamber of an injection cylinder and an oil tank during a molding cycle, excluding an injection step, thereby preventing impact which would otherwise occur due to oil pressure generated upon start of injection in the injection step. Thus, immediately before the start of the injection step, the oil transfer line becomes empty of or almost empty of oil. Accordingly, even when high-pressure oil is supplied into the injection cylinder in an impactive manner upon start of injection, pressure oil ejected from the injection cylinder flows swiftly through the oil transfer line.
Claims9
A method for preventing occurrence of impact pressure in an injection molding machine comprising the following steps:
- supplying gas into an oil transfer line extending between a front oil chamber of an injection cylinder and an oil tank during a molding cycle;
- and
- terminating the supply of gas during an injection step.
Dependencies are inferred from the claim text.