Back to results
US 5,492,670 AGranted
Injection molding method
AssigneeNissei Plastic Industrial Co., Ltd.
InventorsMasaaki Minamimura, Fumio Shiozawa
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeNissei Plastic Industrial Co., Ltd.
InventorsMasaaki Minamimura, Fumio Shiozawa
Estimating the term…
An injection molding method characterized in that after resin charging is completed, with the screw allowed to rotate, process is shifted to the metering process, and using the back pressure in the metering process as a dwelling pressure, dwelling is performed simultaneously with the resin metering. In addition, with the back pressure required for metering set to a higher value as a primary back pressure, and using the back pressure as a dwelling pressure, dwelling is performed simultaneously with the resin metering, and after the dwelling time has elapsed, with the pressure allowed to lower so as to use as a secondary back pressure, the metering is continued to a set time. According to the above-mentioned method, as a whole, the required cycle time becomes shorter than in a conventional case where metering is started after dwelling.
An injection molding method comprising a metering process in which with a screw for injection provided in an injection heating cylinder, a resin supplied into the injection heating cylinder is made plasticated under a back pressure while rotating the screw and stored in a head portion of the injection heating cylinder by the backward movement of the screw associated with the plastication, and an injecting process in which the metered resin is injection charged into a cavity of a mold by the forward movement of the screw and after the charging is completed, dwelling is performed, characterized in that:
An injection molding method comprising a metering process in which with a screw for injection provided in an injection heating cylinder, a resin supplied into the injection heating cylinder is made plasticated under a back pressure while rotating the screw and stored in the head portion of the injection heating cylinder by the backward movement of the screw associated with the plastication, and an injecting process in which the metered resin is charged into the cavity of a mold by the forward movement of the screw and after the charging is completed, dwelling is performed, characterized in that:
Dependencies are inferred from the claim text.