How to select plastic injection molding machine:  

We could select the plastic injection machine  by: 

injection volume, injection pressure and injection mold cavity number:                

1. Injection volume    injection volume  the theoretical injection volume by injection machine each time V= (π*D2*S)/4  V=The maximum theoretical injection volume (cm3) D= screw diameter, cm;  S=Maximum injection molding travel ,cm   Nominal injection volume: In the injection molding process, due to the change of temperature and pressure, the density of plastic will change, plus with the material leakage, the maximum injection capacity of the injection molding machine(Nominal injection capacity) V=K*(π*D2*S)/4  V=The maximum theoretical injection volume (cm3) D= screw diameter, cm;  S=Maximum injection molding travel ,cm  K=Injection coefficient（crystallized polymers：0.85;Non-crystallized polymers:0.93）

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