1, choose the right heating device
The use of fire or baking to remove the screw on the plastics, plastic processing units are the most common and most effective way, but absolutely cannot use acetylene flame to clean the screw. Acetylene flame temperature up to 3000 ° C, with acetylene flame to clean the screw will not only destroy the screw metal characteristics, but also significantly affect the screw mechanical tolerances.
If the acetylene flame in the baking screw in a bit of a lasting blue, then means that the screw rod of the metal structure has changed, which will lead to the site wear resistance, even wear resistance layer and substrate metal stripping. In addition, the use of acetylene flame local heating can also cause the screw side overheating, resulting in screw bending. Most screw adopts 4140. H.T. Steel manufacturing, tolerances are very tight, generally within 0.03mm.
The straightness of the screw is mostly within 0.01mm, when the screw is baked and cooled by acetylene flame, it is usually difficult to return to the original flatness. Correct and effective method: Use the torch for cleaning immediately after the screw is used. Because the screw is in the process of heat, so the heat distribution of the screw is even.
2, choose the correct detergent
Commodity economy is highly developed today, the market there are a variety of screw cleaner (screw cleaning materials), most of the price is expensive, the use of different effects. Whether the use of commercial detergents, according to different manufacturers and production conditions; plastics processing enterprises can also be based on their own production conditions, using different resins to make screw cleaning materials, can be a unit to save a small expense.
3, choose the correct cleaning method
The first step in cleaning the screw is to turn off the feeding plate, which is to shut down the bottom of the hopper, and then reduce the screw speed to 15-25r/min, and keep this speed until the melt flow stops at the front of the die head. The temperature of all heating areas of the barrel shall be set at 200 ° C. Once the barrel reaches this temperature, start cleaning immediately.
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