What is the characteristics of injection molding?

When the flow plastic is homogenized inside the barrel, the material is injected into the mold cavity in a short time, maybe less than one second. 

When the cavity is over packed, the volume of injected material is more than the part in order to compensate the shrinkage, the pressure is reduced and the cooling system start to work. After the parts are solidified, the back platen of press moves and ejects the parts. Then the process completes

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