Injection molding apparatus and scroll for injection molding apparatus

An injection molding apparatus which injection-molds a product by injecting a plasticized material into a cavity of a mold, comprising:

• a plasticizing block that includes therein a plasticizing and force-feeding mechanism which heats and plasticizes a material and force-feeds the material while kneading it;
• a weighing block that is connected to the plasticizing block in close contact with it, and includes therein a weighing and feeding mechanism which weighs and feeds out the material force-fed by said plasticizing and force-feeding mechanism;
• a fixed die plate that includes therein an injection mechanism which injects the material weighed and fed out by said weighing and feeding mechanism into a cavity;
• a movable die plate that advances to and retreats from the fixed die plate and makes said cavity a substantially closed space when abutting on the fixed die plate;
• and
• a clamping housing that includes therein a movable die plate drive mechanism which is fixedly provided at a predetermined distance from said fixed die plate by a plurality of tie bars for guiding said movable die plate, advances and retreats the movable die plate to and from said fixed die plate, and generates a predetermined clamping force when the movable die plate abuts on said fixed die plate.