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Function of high quality extruder screens products

(Summary description)In the extrusion process of the extruder, the molten material is transported to the die through the screen of the high-quality extruder screens products of extruder can filter the materials and improve the mixing effect of materials. However, the extruder screens can also make the process fluctuate, resulting in the rise and sometimes decrease of back pressure and molten material temperature

Function of high quality extruder screens products

(Summary description)In the extrusion process of the extruder, the molten material is transported to the die through the screen of the high-quality extruder screens products of extruder can filter the materials and improve the mixing effect of materials. However, the extruder screens can also make the process fluctuate, resulting in the rise and sometimes decrease of back pressure and molten material temperature

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In the extrusion process of the extruder, the molten material is transported to the die through the screen of the high-quality extruder screens products of extruder can filter the materials and improve the mixing effect of materials. However, the extruder screens can also make the process fluctuate, resulting in the rise and sometimes decrease of back pressure and molten material temperature.

High quality extruder screens products are fixed on a porous or grooved protective plate, which can form a seal between the extruder and the die. The pressure generated by clean extruder screen products is small, which may be only 50 ~ 100lb / in2 (1lb = 0.4536kg, 1in = 25.4mm). With the increase of pressure, the amount of impurities in the resin intercepted on the screen product of the extruder becomes more, which blocks the filter screen single screw extruder.

When the blocked extruder screen is replaced, the pressure will drop suddenly, and the temperature of molten material may also drop, resulting in the change of product size. In order to keep the same size of the product, the screw speed of the extruder and the linear speed of the extruder can be adjusted. These changes may not cause serious problems when extruding round products, but when extruding flat or irregular products, the change of molten material temperature may affect the overall dimensions of the products. For example, in a flat die, the colder molten material may make the center of the sheet thinner and the periphery thicker. In this case, the twin-screw extruder can be corrected by automatic or manual adjustment of the die.

Behind the screen product converter of the extruder, a gear pump that can ensure the stable entry of molten materials into the die can prevent the occurrence of the above problems. However, the temperature change of molten material after the replacement of extruder screen products still needs to be solved by adjusting the die. At the same time, because the gear pump is easy to be damaged by hard impurities, the gear pump also needs to be protected by fine filter screen.

The reason why some hard PVC processors are unwilling to use high-quality extruder screen products is that high-quality extruder screen products will increase the temperature of PVC molten materials and be prone to degradation, which requires materials with better thermal stability, thus increasing the cost of materials. If the high-quality PVC extruder screen product converter is used, the cost will also be increased. Therefore, most rigid PVC processors either avoid the use of extruder screen products, or use the coarse filtration device without converter to filter only the impurities of larger particles.

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