Injection molding machine for foam molding and method for molding foam molded product
AssigneeThe Japan Steel Works, Ltd.
InventorsAkihiro NAITO, Takuya Yufu
Life of this patent
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Abstract
An injection molding machine for foam molding includes a heating cylinder having a gas injection port, a screw which is drivable in the heating cylinder, a gas supply device configured to supply a gas to the gas injection port, the gas supply device including a valve mechanism in a gas flow path, and a control device. The control device is configured to control the valve mechanism to close the valve mechanism at least once in a molding cycle, and keep the valve mechanism open at least in a measuring step.
Claims23
An injection molding machine for foam molding, comprising:
- a heating cylinder having a gas injection port;
- a screw which is drivable in the heating cylinder;
- a gas supply device configured to supply a gas to the gas injection port, the gas supply device comprising a valve mechanism in a gas flow path;
- and
- a control device configured to control the valve mechanism to:
- close the valve mechanism at least once in a molding cycle;
- and
- keep the valve mechanism open at least in a measuring step.
A method for molding a foam molded product using an injection molding machine for foam molding,
- the injection molding machine comprising:
- a heating cylinder provided with a gas injection port;
- a screw which is drivable in the heating cylinder;
- a gas supply device configured to supply a gas to the gas injection port;
- and
- a valve mechanism provided in a gas flow path of the gas supply device,
- the method comprising:
- controlling the valve mechanism to:
- close the valve mechanism at least once in a molding cycle;
- and
- keep the valve mechanism open to supply the gas to a resin in the heating cylinder at least in a measuring step.
Dependencies are inferred from the claim text.