How to Control the Temperature of Plastic Extruder

Those who have operated plastic extruder equipment know that in order to produce high-quality plastic products, effective and precise control of the temperature of the plastic extruder is necessary. The accuracy of temperature control directly affects the quality of the plastic finished product. The temperature control of the screw is particularly important as it directly affects the plasticization and melting state of the polymer material.

Causes and solutions of screw wear in extruders

Normal wear of the screw and barrel of the jwell extruder mainly occurs in the feeding and metering areas. The main cause of wear is dry friction between the material particles and the metal surface. When the material particles are heated and softened, the wear is reduced. When the screw is locked by a ring or foreign matter, abnormal wear occurs. Ring-locking means that the screw is locked by condensed material. If the plastic extruder lacks good protection, the powerful driving force may cause the screw to twist or break. If the screw is jammed, excessive resistance will be generated, seriously damaging the surface structure of the screw and producing serious scratches. The design principle of the barrel is to ensure that its service life is longer than that of the screw. Normal barrel wear is usually not repaired. The method of repairing threads is usually used to restore the radial gap between the inner hole of the barrel and the outer diameter of the screw.

Method: The local damage of the extruder screw and barrel can be repaired by special corrosion-resistant and wear-resistant alloy surfacing. Usually, inert gas protection welding and plasma argon arc welding are used, and metal spraying technology can also be used for repair. The worn surface of the screw is ground to about 1.5mm, and then the alloy layer is covered with sufficient size to ensure sufficient processing margin. The outer periphery and side surface of the screw are ground to the original size of the screw. The screw structure is complex and technical. We recommend that when the screw has problems and has seriously affected the normal operation of the plastic extruder, it should be evaluated and repaired by a screw and barrel for extruder factory to some extent.

Temperature control of plastic extruders

Before production, plastic products need to be preheated to a specific temperature in the plastic extruder before the equipment can be started normally and the rubber raw materials can be added to the feeding system.

How is the temperature of the plastic extruder controlled? The answer is water. Generally, manufacturers use water-type mold temperature machines to raise the temperature of water, and then use pressure to circulate the conductor through the equipment waterway to achieve temperature control. When using a plastic extruder, the temperature is divided into several sections, and each mold temperature machine controls a temperature control section. After the temperature is constant, the water temperature is transferred to the barrel and screw of the equipment, and the equipment can then achieve temperature increase.

During the production process, the barrel and screw of the equipment continuously work with each other, so the temperature of the equipment also increases under the operation of the barrel and screw.

However, excessively high temperatures will be detrimental to the processing of rubber products, so the temperature needs to be controlled within a reasonable range to avoid the continuous high temperature affecting the processing. Therefore, when the temperature of the equipment is too high, cooling is required, and cooling also needs to use cooling water to reduce the temperature, which requires the use of a chiller.