Bamboo joint type back-mixing screw rod for enhancing heat transfer and mixing

Abstract

The invention discloses a bamboo joint type back-mixing screw rod for enhancing heat transfer and mixing, and belongs to the technical field of polymer processing and molding. The bamboo joint type back-mixing screw rod for enhancing heat transfer and mixing comprises a threaded section and a back-mixing element, wherein the back-mixing element comprises a barrier wall and a plurality of notches,one surface of the barrier wall in the flow direction is a back-mixing surface in the process of forward conveying materials, and the back-mixing surface is a convergent curved surface with variable curvature from the bottom to the top of the barrier wall; the back-mixing surface can enable materials to generate tumbling counterflow in the conveying process, and a part of fluid flows reversely andis fully mixed on the cross section of a flow channel; and the top of the barrier wall is provided with a plurality of notches which are uniformly distributed. According to the bamboo joint type back-mixing screw rod for enhancing heat transfer and mixing, the mixing and plasticizing performance of the screw rod is improved, so that the product has better use performance and surface quality, meanwhile, a convergent flow channel is formed, the stretching effect is strengthened, large shearing force generated in the processing process is avoided, and the processing flexibility of various materials is increased.

Description

technical field [0001] The invention belongs to the technical field of polymer processing and molding, and in particular relates to a slub-type back-mixing screw for enhancing heat transfer and mixing. Background technique [0002] The screw is the core component of the polymer processing and molding device (extruder, injection molding machine, etc.), and its mixing and plasticizing performance determines the quality of the final product and the production cost, so it is of great significance to the optimization of the screw structure. Especially in some special product fields, higher requirements are put forward for the screw. For example, for cellulose-reinforced bio-based nanocomposites, low-shear, high-mixing screws are required, and at the same time, it is necessary to prevent overheating and decomposition of nanomaterials such as filled cellulose, which is particularly important for temperature control and thermal energy management during the entire plasticization proc...

AI Technical Summary

Problems solved by technology

[0003] Chinese invention patent application CN104526996A discloses a high-shear high-mixing plasticizing screw, which mainly improves the shearing and plasticizing effects of the screw through the special structural design of the double-threaded melting section and the mixing section, but its structure Relatively complex, high processing cost, and some materials are easy to decompose under the action of high shear force, which limits the scope of its use

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