The basic form of water nozzle can be divided into straight-through type, closed-mouth type, hot runner type, multi-runner type three, our factory is currently using straight-through nozzle. Through nozzle is a kind of nozzle widely used, which is characterized by the nozzle sphere directly contact with the mold main pouring sleeve sphere, the nozzle arc radius and flow channel is smaller than the mold, injection, high-pressure melt directly through the mold runner system filling into the mold cavity, two-color injection molding machine is fast, small pressure loss, manufacturing and installation are more convenient. The closed nozzle mainly solves the salivation problem of the straight-through nozzle and is suitable for processing low viscosity polymers (such as PA).

During the premolding process, the nozzle flow path can be closed to prevent the phenomenon of melt salivation, and the melt can be opened under the action of injection pressure to inject the mold cavity. 2. The working principle of the injection cylinder is: when the injection cylinder is fed, the piston rod of the domestic injection molding machine brand and the bearing located in the thrust seat drive the piston rod to push the screw forward or backward. The axial position of the two parallel piston rods and the axial position of the injection screw can be adjusted at the same time.