There are three basic types of plastics processing machines.: 1. Extruders; 2. Blow Molding machines; 3. Injection molding machines. Screw and barrel is considered as the heart of any plastic processing machine. The screw is a rotating component in the barrel which is stationary. The basic process taking place in any plastic processing machine is that the plastic raw material in the form of granules is added to the barrel through the hopper. The rotating screw carries the material in the forward direction. Heaters are provided on the outside diameter of the barrel; which heat the granules & transform them into paste form. In addition to the heating, the screw has smaller core diameters which are in taper shape. The taper core squeezes the material further.
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