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What is the effect of extrusion screen on the temperature of molten material

  • Categories:NEWS
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  • Time of issue:2021-11-11 21:16
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(Summary description)Extruder Screens will affect the temperature of molten material.Extruder Screen is fixed on a porous or grooved protective plate, which can form a seal between the extruder and the die. The pressure generated by clean filter screen is small, which may be only 50 ~ 100lb / in2. With the increase of pressure, the amount of impurities in the resin intercepted by the filter screen becomes more, which blocks the filter screen.

What is the effect of extrusion screen on the temperature of molten material

(Summary description)Extruder Screens will affect the temperature of molten material.Extruder Screen is fixed on a porous or grooved protective plate, which can form a seal between the extruder and the die. The pressure generated by clean filter screen is small, which may be only 50 ~ 100lb / in2. With the increase of pressure, the amount of impurities in the resin intercepted by the filter screen becomes more, which blocks the filter screen.

  • Categories:NEWS
  • Author:
  • Origin:
  • Time of issue:2021-11-11 21:16
  • Views:
Information

Extruder Screens will affect the temperature of molten material.Extruder Screen is fixed on a porous or grooved protective plate, which can form a seal between the extruder and the die. The pressure generated by clean filter screen is small, which may be only 50 ~ 100lb / in2. With the increase of pressure, the amount of impurities in the resin intercepted by the filter screen becomes more, which blocks the filter screen.

When the blocked extruder screens 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. This situation can be corrected by automatic or manual adjustment of the die.

Behind the extruder screens converter, a gear pump that can ensure the stable entry of molten materials into the mold can prevent the occurrence of the above problems. However, the temperature change of molten material after extruder screens replacement still needs to be solved by adjusting the mold. 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 a fine filter screen. The reason why some rigid PVC processors are unwilling to use the filter screen is that the filter screen 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 PVC special filter screen converter is used, the cost will also be increased. Therefore, most rigid PVC processors either avoid using the filter screen or use the coarse filtration device without converter to filter only the impurities of larger particles.

The extrusion screen manufacturer tells you the effect of the screen on the temperature of the molten material.

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