How Many Types of Nozzles in the Injection Molding Machine?

How Many Types of Nozzles in the Injection Molding Machine?

There are three types of nozzle tips based on their design in the injection molding process, including general-purpose, reverse taper, and free flow. The method of mold filling depends upon the creation of the nozzle tip and size. If there is a small orifice size-wise, the required injection pressure would be high for the material injection. As a result, the machine pressure to fill and pack the mold might be lowered. Body of nozzle and tip: a nozzle comprises two parts - the nozzle body and the thread of the nozzle. The thread of the nozzle is tied to the barrel. The point above the thread of the nozzle is hexagonal. To this point, the head of the barrel is tightened. The nozzle acts as a connector between the radius of the nozzle's sprue bruce and the radius of the adaptor of the barrel. The end of the nozzle may contain a convex radius. For example, the tip of the nozzle includes a convex surface.

The radius of the nozzle is lower than the radius of the sprue bruce. The nozzle's surface is concave, and that of sprue bruce is convex; if this is reversed, leakage might occur. Heating bands are also attached to the nozzle. Nozzle transfers the material to the mold. Thus, due to the presence of heating bands, plastic material is melted. Nozzle helps in feeding the material to the cavity of the mold. The shape of the nozzle is cylindrical.


Generally, we use following types of nozzles.

  • Simple nozzle

  • Hydraulic shut off nozzle

  • Spring shut off nozzle

  • Reverse paper nozzle


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