As a main component of injection molding machine, nozzle is used to prevent polymer
melt from leaking during plasticizing and provide an access injecting polymer melt into the mold cavity
during injecting process. The straight-through nozzles and shut off nozzles with hydraulic or
pneumatic are adopted in the traditional injection molding machine. The paper reviews various patents
on nozzles with new structures and optimized design in recent years. A spring-sliding valve type nozzle
is introduced to solve melt leaking, nozzle blocking, and melt thermal decomposition. Moreover, this new type of shut
off nozzle is more compacted and low-cost.
Keywords: Injection molding machine, mold, polymer melt, shut off nozzle, sliding valve, spring.
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