small pu disc plastic moulding machine in United
Used Plastic Extruders | Plastic Extrusion Machines for Sale. The primary function of the screw extruder in injection molding is simply to obtain a melt whereas in a plastic extrusion machine, the screw must mix, homogenize and melt the material.Also to achieve better mixing of the polymers used, the screws used in extrusion process are longer than the ones in injection molding machines.
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