In order to reduce the wear of the barrel and screw, we […]
In order to reduce the wear of the barrel and screw, we have taken corresponding measures in the design and manufacturing process. Through continuous improvement, the barrel and screw design can adapt to different, updated and higher requirements. In order to reduce the wear of the barrel and screw, we can take certain measures to reduce the wear of the barrel and screw during production.
1. Filler: In order to reduce the production cost of PVC pipes, profiles, and aggregates, more and more calcium carbonate is used in the formulation. The wear caused by calcium carbonate is mainly abrasive wear, especially when the amount of additives is large. The content and quality of calcium carbonate have a great influence on the degree of wear. Unreasonable amount of lubricant in the formulation (excessive external lubricant, such as organic wax or stearic acid), will slow down the plasticization process and accelerate the wear process. Attention should be paid to minimize damage to the equipment.
2. Recycled material processing: For the guided rotating twin screw, the material is conveyed in the axial direction, similar to a pair of calendering rollers (calendering effect). The screw is subjected to upward and outward forces, and the screw is pushed onto the barrel, causing abrasion of the screw and the barrel. This is a common phenomenon, but it is more prominent when processing materials. It can be considered that the above-mentioned force is the main factor affecting the degree of screw wear. The larger the particles, the more severe the wear. When processing recycled materials, the particle size of recycled materials should be as small as possible.
3. Processing of rigid PVC particles: the particle size of the particles is basically the same as that of the recycled particles. The main difference between the two is that the shape and size of the granular material is more uniform than that of the recycled material, and the "hard particle effect" brought about by the similar density and geometric shape is basically the same. Therefore, the particle size of the processed aggregate should also be as small as possible.