| 摘要 |
PURPOSE: To collect a part of using gas by communicating an inlet opening for the gas with a gas pressure accumulator of a predetermined volume via a conduit with substantially predetermined pressure of gas in a container, and regulating a flow of the gas passing the conduit via a variable throttle valve provided at the conduit, thereby obtaining a unit for regulating the flow of the gas into a simple nozzle from a conventional unit. CONSTITUTION: An inlet opening 22 of a gas of a nozzle 10 communicates a gas pressure accumulator 29 having a predetermined volume with a conduit 28, and the accumulator communicates with a gas booster 30, i.e., a pressure increasing unit. And, the unit supplies a gas such as nitrogen from a gas bottle via a gas source 31, i.e., an extended part of the conduit 28. And, the conduit 28 has variable throttle valves 32, 33 and a branched conduit 39, recovers the gas flow into the conduit 28 via the valve 32 and the conduit 39, and recirculates it. The valve 33 is normally closed, and the booster 30 holds a constant pressure of 100 to 1,000 atms in the accumulator 29. And, a valve disc 24 is in contact with a seat 25 in the nozzle to prevent the melt plastic from entering into the nozzle. At the time of making a plastic product, the nozzle 10 is in contact with a molding tool 12, and the disc 24 is moved to a left to urge the plastic to a passage 17 to about 500 to 1,000 atms. |
