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Analysis and introduction of filter screen of twin-screw extruder

by:TENGDA     2022-10-06

If the twin-screw extruder extrudes irregular or flat products, changes in the temperature of the molten material may affect the overall dimensions of the product; but if the twin-screw extruder extrudes round products, these changes will It will not cause serious consequences; in a flat mold, if the molten material is cold, it may cause the sheet to be thicker at the periphery and thinner at the center. It can be solved by manual or automatic adjustment of the correcting mold. In addition, behind the filter screen changer, a gear pump can be equipped to ensure that the molten material can enter the mold stably.

The amount of filter screen of the twin-screw extruder is very large. When the filter is blocked and needs to be replaced, the pressure will drop suddenly, so the temperature of the molten material may also drop, which will change the size of the product. Therefore, in order to keep the size of the product the same, two methods can be used to solve it, one of which is to adjust the linear speed of the twin-screw extruder; the other is to adjust the screw speed of the twin-screw extruder.

The twin-screw extruder is composed of a screw, a barrel, a feeding device and a transmission device. During the operation, the material is added in the feeding device, and reaches the head through the action of the screw. During this operation, the movement of the material It will be different according to the rotation direction and meshing mode of the screw, and the filter screen has a certain influence on the extrusion of plastic.

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