Warm Global Customers
With China Plastic Machinery
With China Plastic Machinery
The venting extruder is a special extruder, which is designed with a vent in the middle of the barrel to remove air and volatiles from the plastic.
The working principle of the venting extruder is similar to that of other extruders. Its core components include the extrusion system, transmission system and heating and cooling system. These systems work together to enable the plastic to complete the process of plasticization, melting, venting and molding in the extruder. The design of the vent allows the gas and volatiles in the plastic to be effectively discharged, thereby improving the quality and performance of the product.
The extrusion system is the core part of the extruder, including the screw, barrel, hopper, die and mold. The plastic is plasticized into a uniform melt through the extrusion system and is continuously extruded from the die under pressure. Among them, the screw is a key component of the extruder, which directly affects the application range and production efficiency of the extruder. The barrel and the screw work closely together to crush, soften, melt, plasticize and compact the plastic and transport it to the molding system. The hopper is responsible for providing plastic raw materials and can be precisely controlled by the cut-off device and metering device. The die and mold are responsible for converting the molten plastic into the required shape and specifications.
The transmission system is responsible for driving the screw and providing the torque and speed required during the extrusion process. It is usually composed of a motor, a reducer and a bearing.
The heating and cooling system is an indispensable part of the plastic extrusion process. Extruders usually use electric heating, including resistance heating and induction heating. The heating devices are distributed in the body, neck, head and other parts to ensure that the plastic can reach the appropriate temperature. The cooling device is used to keep the plastic within the temperature range required by the process to avoid excessive temperature causing the plastic to decompose or difficult to shape. Common cooling methods include water cooling and air cooling. Large extruders often use water cooling, while small extruders are more suitable for air cooling. In addition, screw cooling usually uses central water cooling to enhance the material conveying capacity, stabilize the glue output and improve product quality.
The auxiliary equipment of the extruder unit includes a pay-off device, a straightening device, a preheating device, a cooling device, a traction device, a meter, a spark tester and a take-up device. These devices can be selected and configured according to different extrusion requirements. For example, the straightening device can effectively reduce the eccentricity problem in plastic waste, while the preheating device helps to remove moisture and oil from the surface of the plastic to ensure the extrusion quality. The cooling device ensures that the extruded plastic can be quickly shaped and avoid deformation through water cooling or air cooling.
The control system of the extruder includes a heating system, a cooling system and a process parameter measurement system. These systems work together to control and adjust the various process parameters of the extruder to ensure the consistency and stability of the extrusion quality. The control system also includes electrical appliances, instruments and actuators, such as control panels and operating consoles, which work together to achieve precise control of the extrusion process.
Venting extruders are widely used in processing highly hygroscopic polymer raw materials, such as rigid polyvinyl chloride, ABS, nylon, polyoxymethylene and polymethyl methacrylate. Due to its good venting effect, the bubbles in the extrudate are significantly reduced, which significantly improves the quality of the finished product. Venting extruders are widely used in granulation and molding.
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