Lab Scale TPE Thermoplastic Elastomers

The effect of twin screw extruder filter screen on plastic extrusion

by：TENGDA 2022-01-11

Nanjing twin-screw extruder manufacturer introduces the influence of twin-screw extruder filter screen on plastic extrusion. 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 through the action of the screw, it reaches the head. During this operation, the movement of the material is It will be different according to the rotation direction of the screw and the way of meshing. Among them, the filter has a certain influence on the extrusion of plastic.

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

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

The above Nanjing twin-screw extruder manufacturer-Tengda Machinery introduced the influence of twin-screw extruder filters on plastic extrusion, and everyone has a certain understanding. After replacing the filter, the temperature change of the molten material still needs to be solved by adjusting the mold. At the same time, because the gear pump is easily damaged by hard impurities, the twin-screw extruder manufacturer suggests that the gear pump also needs to be protected by a filter.

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