In the plastic industry, twin-screw extruder is a key equipment to add different materials in accordance with a certain proportion, through the shearing and mixing of the screw, with the temperature setting of the equipment to achieve materials uniform mixing (or reaction extrusion, etc.), and then through a certain extruder equipment to obtain particles with good performance. Therefore, temperature setting is also a key control parameter of twin-screw extruder.
However, the temperature setting of each area of the twin-screw extruder is often a key challenge.
This article will deeply discuss the temperature settings in different areas of the twin-screw extruder and their effects on the extrusion process and the final product.
Twin-screw extruder plays a vital role in the manufacture of plastic products.
It consists of several regions, and the temperature setting of each area has an important impact on the quality of the final product.
This article describes these areas and their temperature settings in detail.
Area 1: feed area of twin-screw extruder
The first area zone of the extrusion process is the feed area.
Here, the original plastic particles are introduced into the extruder.
The temperature setting is critical here,usually different plastics havve different melt temperatures. The temperature here is set as close to or higher than the melting temperature of the material as possible, the purpose is to quickly melt the material, but here we must note that: generally the feed port is cooled by water. The purpose is to cool the material and increase the friction between the material and the barrel screw. To increase its conveying capacity, the temperature is set from the second barrel zone, generally the second barrel zone temperature is set below the melting temperature of about 20 degrees, and the temperature is higher than or close to the melting temperature from the third barrel zone. Keep the temperature in the back barrel zones.
Area 2: melting zone of twin-screw extruder
The melting zone is the place where plastic particles melt for the first time.
The temperature setting is usually between 150 °C and 280 °C（The melting temperature of different plastics varies greatly） to ensure that the plastic melts completely but avoids overheating.
Area 3: twin-screw extruder extrusion zone
The temperature setting of the extrusion zone is generally lower than the melting temperature of 10-20°C, because in the extruder section area, the material has been completely melted, and the reduction of temperature in this area can ensure that the material is extruded at a low temperature, and can also prevent the material from decomposing after overheating (typical particles are PVC heat-sensitive materials)
Area 4: twin-screw extruder die area
The die area is the last area, and the temperature is usually between 250 °C and 280 °C.
The temperature setting here affects the appearance and performance of the final product.
Importance of temperature adjustment of twin-screw extruder
It is very important to adjust the temperature of each area properly.
If the temperature is not set properly, it may lead to quality problems of the product, such as bubbles, sintering or melt instability. Therefore, the operator must carefully monitor and adjust these temperatures.
correct temperature adjustment can help reduce energy consumption in the production process. By setting the temperature in an appropriate range, the energy consumption of the heating and cooling system can be reduced, thereby saving energy and reducing production costs.
reasonable temperature control can prevent plastic materials from decomposing or deteriorating in the case of overheating. This can not only improve production efficiency, but also reduce material waste.
The temperature control of the extruder should be stable and consistent.
Through the use of real-time temperature monitoring system, we can ensure that the temperature of each area is always within the required range, in order to achieve consistent product quality.
proper temperature adjustment can improve production efficiency.
When the temperature is at that time, the plastic material is easier to extrude, reducing the extrusion resistance in production, thus increasing the extrusion speed and output.
excessively high or low temperature settings may cause failure or damage to the extruder. Regular temperature adjustment and monitoring can extend the life of the equipment and reduce the need for maintenance and replacement parts.
In the production process of twin-screw extruder, the temperature setting of each area has a unique importance. Operators must understand the characteristics of the plastic materials used and carefully adjust the temperature to ensure optimal product quality, production efficiency and energy efficiency. Therefore, temperature adjustment is an indispensable part of the operation of twin-screw extruder.
Our Nanjing Granuwel’s temperature control system adopts Omron PID dual-channel temperature control meter or Siemens PLC high-precision temperature control module. Conventional temperature control can be controlled at + – 2°C. The process of heating and cooling is sensitive and the response time is fast. Temperature control can be divided into fast, slow and fine tuning processes through self-diagnosis. Effectively save heat loss caused by excessive heating or cooling. The heating interval is self-adjusted according to the heating power during constant temperature maintenance. Reduces component damage and energy consumption caused by frequent startup of heater elements.
The Challenge of temperature setting of Twin Screw Extruder
Temperature setting is a complex task because different types of plastics require different temperature ranges.
The operator must understand the characteristics of the material used and the specifications of the extruder.
Real-time Monitoring of temperature setting of Twin Screw Extruder
In order to ensure the best product quality, modern twin-screw extruders are equipped with real-time temperature monitoring system.
These systems can automatically adjust the temperature to adapt to the changes in production.
Factors affecting the performance of Twin Screw Extruder
The temperature setting of each area of the twin-screw extruder affects not only the appearance of the product, but also its physical properties.
For example, improper temperature setting may lead to insufficient strength or thermal deformation of the product.
Energy Saving consideration of Twin Screw Extruder
Proper temperature setting not only contributes to product quality but also saves energy. By effectively controlling the temperature, energy consumption and production cost can be reduced. In the production process of twin-screw extruder, the temperature setting of each area is very important. The correct temperature setting can ensure the quality of the final product, reduce production costs, and improve energy efficiency. Now you have learned the importance of the temperature setting in each area of the twin-screw extruder for production. If you would like more information or have any questions, please feel free to contact us.
Nanjing Granuwel Machinery CO., LTD is specializing in R&D design and manufacture of high polymer extruders, our team of top-level extrusion professionals provides the right extruder for your exact application.
We possess excellent capability of innovation and product development, and desire to provide best products for our customers through the improvement of equipment structure and reduction of equipment energy consumption through our practical experiences and technical innovation.
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