How to protect the extrusion screw?

How to protect the extrusion screw?

The design of screw and the structure of screw and barrel are very important when extruding thermoplastic composites. If you think about these issues ahead of time. The processing of thermoplastic composites can be successfully completed. Generally speaking, the screw design of thermoplastic composite materials mainly involves two different aspects, one is the mixture of materials; The second is the mixture of materials. The other is the processing of thermoplastic composites. This article focuses on the latter. But many of the issues discussed are directly related to both.

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Screw design
The main functions of most screws used for thermoplastic resin extrusion are: feeding, plasticizing and extrusion. Typically, the feed section of the screw is used to transport solid resins and fillers. Compared with thermoplastic polymers without fillers, the screw feed segments of thermoplastic composites are structurally very different, which is mainly affected by the relative friction coefficient of solid particles. Generally speaking, the friction generated in the feeding stage comes from three aspects, namely: friction between particles and cylinder wall, friction between particles and screw, and friction between particles and particles. Although it PERFORMS WELL WHEN FED WITH PURE resin without filler, the friction coefficient changes significantly when foundation is added, which greatly affects the feed efficiency of the screw. For example, when mica is added, the friction coefficient is significantly reduced and the feed section of the screw should be lengthened and kept at a constant depth. Ensure that the material receives sufficient feeding force (stable pressure) before entering the screw plasticizing section (including conveying section and barrier section).
Similarly, in order to improve the delivery efficiency of particles, it is necessary to change the temperature environment, which can be achieved by increasing the temperature of the first section of the cylinder to increase the friction coefficient between particles and the wall surface. Cartridge, so that the polymer adheres to the barrel and is transported forward. Often, an unstable or inefficient feeding process directly leads to a decrease in yield and adversely affects processing.