GAS SUPPLY DEVICE, INJECTION MOLDING MACHINE, AND FOAM MOLDING METHOD
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United States of America Patent
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Issued Date -
Jan 18, 2024
app pub date -
Nov 17, 2021
filing date -
Dec 4, 2020
priority date (Note) -
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Abstract
An injection device (2) of an injection molding machine (1) includes a heating cylinder (18) having a gas introduction port (30) and a screw (19), and a gas supply device (5) is connected to the gas introduction port (30). The gas supply device (5) includes a gas supply source (33) and a gas pressure regulating unit (34). The gas pressure regulating unit (34) regulates a gas pressure and supplies the gas when a gas from the gas supply source (33) is introduced into the gas introduction port (30). Specifically, the gas pressure is caused to change in a molding cycle and is increased to a high pressure in a metering process (61). That is, a pressure increasing period (71) in which the gas pressure increases at least partially overlaps with the metering process (61).
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