METHOD AND APPARTUS FOR CONTROLLING FLUIDITY INDEX OF MOLTEN RESIN

    公开(公告)号:US20230302701A1

    公开(公告)日:2023-09-28

    申请号:US17772563

    申请日:2020-10-21

    Inventor: Hiroshi OKUYAMA

    Abstract: There is provided a method for controlling a fluidity index of a molten resin, which can detect the fluidity of a molten resin even during successive molding operations and, in addition, can control the fluidity within a target range. The method includes: assuming that a narrow flow path, formed in a flow path for the molten resin, is a capillary or an orifice, and measuring, based on the amount of a metered molten resin and the back pressure applied to the screw during a metering step, a fluidity index which indicates the fluidity of the metered molten resin; and feeding back the measured fluidity index value and comparing it with a target value, and controlling the back pressure or the rotating speed of the screw so as to eliminate a deviation between the target value and the measured value.

Patent Agency Ranking