Waster Plastic granulation extruder extrusion machinery principle

The basic mechanism of Waster Plastic granulation extruder extrusion is simple – a screw rotates in the barrel and pushes the plastic forward. The screw is actually a bevel or slope that is wrapped around the center layer. Its purpose is to increase the pressure in order to overcome the large resistance. In the case of an extruder, there are three types of resistance that need to be overcome: the friction of the solid particles (feed) against the wall of the cylinder and the mutual friction between the coils before the rotation of the screw (feeding zone); Adhesion on the wall of the barrel; the internal flow resistance of the melt as it is pushed forward.

Newton has explained that if an object does not move in a given direction, the force on the object is balanced in this direction. The screw does not move in the axial direction, although it may rotate laterally rapidly near the circumference. Therefore, the axial force on the screw is balanced, and if the Waster Plastic granulation extruder applies a large forward thrust to the plastic melt, it also applies an identical rearward thrust to the object. Here, the thrust applied is the bearing acting on the thrust bearing behind the feed port.
Waster Plastic granulation extruder Most single screws are right-handed threads, like screws and bolts used in woodworking and machinery. If they look from the back, they are rotating in the opposite direction because they try to spin out the barrel as far as possible. In some twin-screw extruders, the two screws rotate in opposite directions in two cylinders and cross each other, so one is right-handed and the other is left-handed. In other occlusal twin screws, the two screws rotate in the same direction and thus have the same orientation. However, in either case, there is a thrust bearing that absorbs the backward force, and Newton’s principle still applies.

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