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Measures to reduce screw wear

2021-06-25

Measures to reduce screw wear
1. Measures taken in the design and manufacture of the machine to reduce the wear of the screw and barrel

The geometry of the screw is designed according to the specific application. If the operating conditions are normal and meet the operating requirements, it should be able to achieve gentle processing of different materials and a long service life of the screw and barrel. In order to reduce the wear of the screw and barrel, corresponding measures have been taken in the design and manufacture of the machine. Through continuous improvement, the geometric design of the screw can be adapted to different, newer and higher requirements.

2. Measures to be taken to reduce the wear of the screw and barrel in terms of process parameters and operations

(1) Packing

In order to reduce the production cost of PVC pipes, profiles and pellets, 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 addition is large (>8 parts), the wear will be very serious. The quantity and quality of calcium carbonate have a great influence on the degree of wear.

Unreasonable amount of lubricant added in the formula (excessive amount of external lubricant, such as organic wax or stearic acid) will slow down the plasticization process and accelerate the wear process.

The above points should be paid attention to when using, and the damage to the equipment should be minimized.

(2) Processing of recycled materials

For the guided-rotating twin screw, the material is conveyed in the axial direction, similar to the situation of a pair of calendering rollers (calendering effect). The screw is subjected to upward and outward forces, and the screw is pushed to the barrel, causing the screw and barrel to wear. This is a common phenomenon, but it is more prominent when processing materials. It is conceivable that the above-mentioned force is proportional to the size of the recycled material (hard particles) and the particle size is the main influencing factor for the degree of wear of the screw and barrel. 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 hard PVC pellets

The particle size of the pellets has basically the same effect as the particle size of the recycled materials. The main difference between the two is that the shape and size of the pellets are more uniform than the recycled materials, and the "hard particle effect" brought b

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