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How to properly clean the twin-screw extruder screw

by:TENGDA     2022-12-30
1. Choose the correct heating device.
It is the most common and effective method for plastic processing units to remove the plastic fixed on the screw of the twin-screw extruder by burning or roasting. But never use an acetylene flame to clean the screw.
The temperature of the acetylene flame can reach 3000°C. Cleaning the screw with the acetylene flame will not only destroy the metal properties of the screw, but also affect the mechanical tolerance of the screw. If the acetylene flame turns into a persistent blue color when baking a certain part of the screw, it means that the metal structure of the screw has changed, which will cause the wear resistance of this part to decrease, and even the wear-resistant layer will peel off from the base metal. In addition, locally heating the acetylene flame can also cause overheating on one side of the screw, causing the screw to bend.
Correct and effective method: Clean the screw of the twin-screw extruder with a blowtorch immediately after use. Since the screw has heat during processing at this time, the heat distribution of the screw is still uniform.
Second, choose the correct detergent.
Today, when the commodity economy is highly developed, there are many screw cleaners (screw cleaners) for various twin-screw extruders on the market, most of which are expensive and have different effects. Whether to use commercial cleaners depends on different manufacturers and production conditions; plastic modification processing companies can also use different resins as screw cleaning materials according to their own production conditions, which can save a lot of money for the unit.
Third, choose the correct cleaning method.

The first step to clean the screw is to close the feed gate, that is, close the feed port at the bottom of the hopper; then reduce the screw speed to 15-25r/min, and maintain this speed until the melt flow at the front of the die stops flowing. The temperature of all heating zones of the barrel should be set at 200°C. When the barrel reaches this temperature, start cleaning immediately. Depending on the extrusion process (the die may need to be removed to reduce the risk of high extruder head pressure).

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If you follow these straightforward steps you can keep your extruder machine manufacturers plastic extruder machine manufacturers. I think this article will help you make a wise decision on choosing the right .
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