In the mold design process of plastic injection molding, it is necessary to know the molding shrinkage rate. It reflects the molding shrinkage, cavity surface temperature, and injection molding pressure of several major thermoplastics.
The main runner is the first place where the plastic melt passes to the injection mold cavity. It introduces the plastic melt from the nozzle of the injection molding machine into the runner or injection mold cavity. Its shape is conical, which facilitates the smooth flow of the melt forward.
When the mold is opened, the sprue aggregate can be pulled out smoothly. The size of the sprue directly affects the flow rate of the plastic melt and the filling time. Because the sprue has to repeatedly contact and collide with the high-temperature plastic and the injection molding machine nozzle. It is usually not directly opened on the fixed mold. Instead, it is separately designed as a main runner sleeve and inserted into the fixed mold.
The sprue sleeve is usually made of high carbon tool steel.
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