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Screw and Barrel for Plastic Sheet Machine manufacturers teach you how to slow down the wear of plastic extruder screw barrel
The manufacturer of Screw and Barrel for Plastic Sheet Machine tells you that the screw barrel is the core component of the plastic extruder, which can be called the "heart", so people are very concerned about the service life of the barrel and screw when using the plastic extruder. Because the plastic extruder screw barrel is affected by its own material hardness, wear resistance, design, processing technology, assembly, production efficiency and other factors, it is inevitable that it will be worn during use. Once it is worn, it will affect Extrusion effect, is there any way to slow down its wear and tear?
The manufacturer of Screw and Barrel for Plastic Sheet Machine tells you that the screw is generally made of high-strength, corrosion-resistant alloy steel, and the barrel is basically a metal cylinder, which is made of high heat resistance, high compressive strength, firmness and It is made of corrosion-resistant alloy steel or composite steel pipe lined with alloy steel.
The manufacturer of Screw and Barrel for Plastic Sheet Machine tells you that the barrel and the screw cooperate with each other to realize the crushing, softening, melting, plasticizing, exhausting and compacting of plastics, and convey them to the molding system continuously and uniformly Plastic, and the barrel is also a support for many devices during installation.
How to slow down the wear speed of the barrel and screw and improve the effective service life is a problem that many users are very concerned about.
If the residence time of the material in the screw is reduced, it will easily lead to uneven mixing and plasticization of the material. After excessive shearing, it may cause the material to rise sharply and thermally decompose, and the difficulty of extrusion stability control will increase. Once the extrusion is unstable, it will cause the size of the extrudate to change.
The accuracy of auxiliary devices and control systems should be improved. If the screw and barrel are severely worn, high wear-resistant and ultra-high wear-resistant materials need to be used. When the reducer and bearing are running at high speed, their service life must also be guaranteed. .
The manufacturer of Screw and Barrel for Plastic Sheet Machine tells you that when using a plastic extruder, users can use some relatively simple methods to improve the wear resistance of the barrel and screw. The screw and barrel can be designed to be in the barrel The original gap between the inner diameter of the wall and the outer diameter of the flight provides greater melting efficiency. Generally speaking, these gaps are relatively small, so that good heat transfer and shear rates can be exerted.
Once the screw rotates in the barrel, it is inevitable that there will be wear and tear. The manufacturer of Screw and Barrel for Plastic Sheet Machine tells you that wear occurs in many parts, which can occur on the screw flight or the surface of the machine barrel, or on the surface of the screw flight and the machine barrel at the same time. Whether it is grinding fillers in the polymer being processed, or metal particles that do not belong to the melt flow properties, as long as the material being processed is harder, the faster the barrel and screw will wear, and the original clearance will also be lost. Increase.
Once the gap increases, the melting efficiency will decrease. If the melting efficiency decreases compared with the original setting, many users tend to increase the back pressure and temperature of the barrel by increasing the screw speed, so that it can be improved through compensatory adjustments. melting efficiency.
With these adjustments, the occurrence of unmelted material can be properly avoided, the generation of waste can be reduced, and the temperature of the lubricating melt can be increased. However, it should be known that such changes are gradual and are not usually noticed, but these changes will affect product quality and production efficiency.
The manufacturer of Screw and Barrel for Plastic Sheet Machine tells you that when the plasticizing rate, productivity, and waste rate cannot meet the user's requirements, the user begins to want to find out the reason, and the wear of the barrel and screw of the plastic extruder is the cause of these problems The main reason is that at this time, the problem needs to be solved by replacing the screw or barrel.