The extruder screw is an important part of the plastic machine equipment, and it is directly related to the plasticizing effect and output of the plastic machine.
The material of the extruder screw must have high mechanical strength, be able to accept huge torque and have the performance of not deforming under high temperature and high pressure conditions.
The reason: The rotation of the extruder screw in the barrel is carried out under high temperature, high pressure and high torque. Because it needs to forcefully push the material forward during rolling, and it also has to accept strong friction and corrosion from plastic differentiation corrosive gases, it is necessary for the extruder screw to have these advantages.
During the rotation of the extruder screw mainly relies on the screw edge to shear and plasticize the plastic and push the plastic forward, so the screw edge will receive huge shear stress and friction.
Because of working under harsh conditions for a long time, the screw edge is worn and smaller, and the gap with the barrel increases. As a result, the amount of plastic extrusion is reduced. In severe cases, plastic reflow will occur, and the plasticizing effect will be reduced, resulting in a decline in crystal grains and productivity.
Briefly introduce the process of melt extrusion:
The process of melt extrusion is to feed the pre-mixed materials into the extruder barrel from the feeding port. The first section of the barrel of the extruder is the feeding section. The material will not melt at this stage, but will be driven by the extruder screw. The material is brought into the second stage as the compression stage. This stage is the heating stage, the materials begin to melt, and the friction between the materials increases, forming a high-viscosity body. The third section that continues to be driven by the extruder screw into high shear is the homogenization section. This stage will make it very effective to separate the pigment aggregates and achieve the purpose of full dispersion.
The quality of the extruder directly determines the degree of dispersion of the material. At present, the extruder equipment used in powder coatings is twin screw extruder, single screw extruder and star screw extruder. Although the type and internal structure of the extruder are different, the design intent is the same, that is, to maximize the uniform dispersion of materials.
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