The Correct Way to Start and Stop the Twin Screw Extruder

The Correct Way to Start and Stop the Twin Screw Extruder

1. Common errors in the operation:

Operators used to come to the factory in the morning to warm up the double screw extrusion machine, and then go to do other things. This allows the two screw extruder to sit idle for several hours after being heated up to the designed temperature. This operation will cause the polymer to adhere to the screw and barrel, and the polymer material will continue to degrade and carbonize. Then, it is difficult to completely remove these materials when cleaning the polymer extruder machine. What is worse, once the twin screw machine starts to produce products, black spots will periodically exist in the materials extruded from the screw and barrel, polluting the products and leading to substandard product quality.

2. The correct method to start up the machine:

Plan well in advance when you will actually start processing the product, and then figure out the time period required for the set temperature to reach the predetermined value. It is also necessary to do well other preparatory work. After reaching the preheating temperature, feed the barrel and fill in the material immediately to start production.

3. The correct method to shut down the machine:

Before shutting down, fill the twin screw extrusion machine with inert polymer (such as HDPE) as much as possible to seal the machine gaps. HDPE removes oxygen and coats the metal, greatly reducing the formation of carbon oxides. After the twin screw extruder is "sealed", it is better to quickly cool the extruder rather than leave it in the air to cool naturally for 18 hours. The so-called rapid cooling is to set all temperatures to zero and open all cooling water valves. Turn on the cooling water pump, so that the cooling water will flow through all the barrel to achieve rapid cooling. Rapid cooling will avoid polymer degradation and carbonization.

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