Large-scale cone double-extruder foaming screw

Abstract

The invention relates to a large-scale extruder foaming cone double screw comprising a feeding section, a compression section, a metering section, an exhaust section, a mixing section, a pre-compression section and a dynamic mixing head; intermeshing screw flights are arranged in the feeding section, the pre-compression section, the compression section, the metering section, the exhaust section and the mixing section; and screw grooves are formed between the adjacent screw flights, and the dynamic mixing head is provided with intermeshing convex blocks. Compared with the prior art, according to the large-scale extruder foaming cone double screw, the compression section is separated into the pre-compression section and a compression section, the aspect ratio of the screw is improved and theresidence time of materials is prolonged, the efficiency of heat control during the processing is improved, and the plasticization of the materials is completed with minimum stress; by arranging thedynamic mixing head, quantity of heat of the materials when the materials are extruded from the screw is reduced, the temperature of the materials can be effectively prevented from rising due to shearheat, and the precipitation of foaming gas to the surface of the materials is reduced; the length of the cone double screw and the diameter of the screw are extended, the screw volume and surface area are increased to enable the interior of the screw to accommodate more materials, and the production is improved.

Description

technical field [0001] The invention relates to a component of extrusion equipment, in particular to a foaming screw of a large conical double extruder. Background technique [0002] In recent years, people's requirements for plastic products have been continuously improved, especially in terms of energy conservation and environmental protection. Plastic production equipment and processes are required to reduce production costs as much as possible while meeting the use requirements of products, improve resource utilization, and realize green manufacturing. Due to its low thermal conductivity, good acoustic damping, easy mechanical processing, high flame retardancy, good heat resistance and chemical resistance, and low cost brought by its low density, foamed plastics are different from non-woven fabrics. Compared with the foaming process, the consumption of raw materials is significantly reduced, and the environmental pressure is reduced. Among them, the appearance of PVC ri...

AI Technical Summary

Problems solved by technology

At present, the largest conical twin-screw extrusion equipment in China is SJZ80 / 156 conical twin-screw extruder, and its output is about 250kg / h, but the output of this extruder can no longer meet the requirements of the market. Research on large conical twin-screw extruders Foam extruder is the trend of social development in the future

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