The influence of extruder screen pack for plastic extrusion molding

Plastic extruder belonging to one of the plastic machinery, plastic melt in the process of extrusion through the filter to be delivered to the mold, filter material filter and can improve material mixed results, but the filter also makes a technological process to produce fluctuations lead to back pressure and temperature rise or reduce molten material. The following works of plastic extrusion factory in changshu, said the influence of plastic extruder screen pack for plastic extrusion molding.

when replacement block extrusion filter pressure will suddenly drop, plastic melt temperature may drop to change the size of the extrusion product. In order to maintain the product of the same size can adjust extruder screw speed, adjust the linear speed of extruder. When extrusion circular products these changes may not cause serious problems, but out of the flat or irregular shape of the profiles, profiles, the temperature of the molten material size changes may affect the appearance of extrusion profiles.

behind the screen pack changer equipped with a can guarantee the stability of the molten material into the mold of the gear pump can prevent the occurrence of the above problems, but that happened after the molten material in the filter replacement temperature change still needs to be solved through the adjustment of the mould. At the same time because of the gear pump is easy to damage of solid impurities, so gear pump also need to be careful screen pack protection.

some of the hard PVC plastic extruding processors are reluctant to use screen is the cause of screen can make PVC plastic melt temperature and degraded, so you need a better thermal stability material additives to increase the cost of materials, and if use PVC special screen pack changer will increase costs, so most of the hard PVC plastic extruding processors or I do not know with filter, or use without coarse filtering device of the converter.