Conical double screw extruder special for wood plastic composite material

Abstract

The present invention belongs to a special cone-shaped double-screw extruding machine for a wood-plastic composite material of the plastic processing machine, including a power source, a reduction gear box, a screw-machine barrel accessory, a machine frame and a feeding bucket. The power source is connected with a screw inside the screw-machine barrel accessory through the reduction gear box. The feeding bucket communicates with a machine barrel inside the screw-machine barrel accessory. The screw is installed inside the machine barrel. Cooling and temperature-reducing device are installed at the lower part of a feeding opening of the machine barrel and at a closely adjacent section to make the two sections as cooling sections, the sections after which are provided with heating devices which make the rest sections as the heating sections. Only one vent is arranged at the machine barrel. The screw, which is installed inside the machine barrel, is the cone-shaped screw and is provided with a mixing section, and the same time the length-diameter ratio of the machine barrel and the screw is more than 30. Before the vent, the present invention can convey, compress, heat and plastify the wood-plastic composite material under the quite low temperature; after being completely plastified, the plastic can complete enwrap the heated wooden powder before the vent and mix with the wooden powder uniformly; a double-screw vacuum exhausting and flash-preventing device which continuously rotates downwards can exhaust as well as never flash.

Description

Technical field: [0001] The invention belongs to the technical field of plastic machinery, in particular to a special extruding device for plastic composite materials. Background technique [0002] At present, in terms of wood-plastic composite material extrusion equipment at home and abroad, most of the popular conical twin-screw extruders are mainly designed for PVC plastics, and are not specially designed and manufactured for wood-plastic composite materials. However, the extrusion of wood-plastic composite materials and other pure plastic materials, and the extrusion of other plastic composite materials are very different: that is, a large amount of wood powder in wood-plastic composite materials, or other natural fiber materials may contain a lot of water, and also There are other substances which are easily decomposed at high temperature. At the same time, wood powder cannot be melted. The length-to-diameter ratio of existing conical twin-screw extruders is around 22...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to design a method that completely solves the overheating decomposition of wood powder or other fiber materials in the extrusion of wood-plastic composite materials, insufficient plasticization of raw materials, uneven mixing of various components of the material, and overflow of wood powder at the exhaust port. Conical twin-screw extruder for wood-plastic composite materials with problems such as unstable extrusion process

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