SCREW FOR INJECTION MOLDING MACHINE

PROBLEM TO BE SOLVED: To make a density of melted resin material stored at an end of a screw constant by dividing a supply unit into a first region under a material supply port and a second region of its downstream, decreasing a material conveying amount of the first region smaller than that of the second region, and preventing occurrence of retention at the supply unit with satisfactory biting of resin material with the port. SOLUTION: A screw 10 of a full flight is sequentially formed from a rear end to a front end with a supply unit A, compressing unit B and metering unit C. The unit A is divided into a first region (a) under a material supply port 11 and a second region (b) of its downstream area. In this case, material conveying amount of the region (a) becomes smaller than that of the region (b) such that a lead width L1 of a flight 12 of the region (a) and thread root of the screw are set, for example, to L1