Abstract: An injection screw comprise a rear end to a front end of an effective length of the screw compartmented in the order of a feed zone, a compression zone and a metering zone, wherein the metering zone is constituted by the first metering zone, the second metering zone and the relaxation zone. A root diameter of the second metering zone is formed in a smaller diameter than a root diameter of the first metering zone and a screw channel depth is set deeper than a screw channel depth of the first metering zone. Variations in a resin temperature at injecting is solved and melting and kneading through a entire screw further are improved by only partial changing of the configuration of the metering zone.

Abstract: A data processing method of an injection molding machine detects predetermined physical amounts, for example, filling velocities V1, V2 and V3 relative to operations of a plurality of injection apparatuses successively when different materials to be molded are injected into a cavity of a single mold from a plurality of injection apparatuses to fill the cavity so that molding is performed, calculates a characteristic data concerning the sum total of the detected filling velocities V1, V2 and V3, and processes data on the basis of the characteristic data. The axis of abscissa of the characteristic data can take a time or a total capacity of the material successively filled into the mold. The data processing includes display processing for displaying the characteristic data with a graph and the displayed characteristic data is utilized for setting the molding condition and the data analysis.