Compound co-extrusion conical screw extruder

Abstract

The invention relates to a compound co-extrusion conical screw extruder which mainly consists of a charging device, a cylinder, screws, an extruder head, a motor and a driving device. The embedded inner screw and outer screw are arranged in the cylinder. The screwing directions of the inner screw and the outer screw are opposite, and the inner screw and the outer screw do reverse opposite rotation. The two screws can adopt three combination methods that: the inner screw is a conical screw, and the outer screw is a parallel screw; the inner screw is a parallel screw, and the outer screw is a conical screw; and the inner screw and the outer screw are all the conical screws. The embedded screws are connected with the same extruder head. The invention realizes single-machine double-layer co-extrusion, thereby decreasing the quality of the co-extruder hosts, saving the investment and land occupation space of equipment, simultaneously exerting the advantages of the conical screws and enhancing the extruding efficiency and the product processing quality.

Description

technical field [0001] The composite co-extrusion conical screw extruder of the present invention can be used for composite co-extrusion of plastic products such as composite plates, films, pipes, sheets, optical fiber cables, and the like. Background technique [0002] Composite co-extrusion is a processing method in which two or more polymers with different properties are co-extruded to form a multi-layer single product. Such as multi-layer sheets, films, plates, pipes, cables and multi-layer hollow containers. At present, most of the equipment used for composite co-extrusion is composed of two or more than two screw extruders, and different materials are extruded into the co-extrusion die for compounding. The equipment investment is large and complex, and the equipment occupies an area of Larger, especially the more layers of composite products, the more prominent this problem is, in addition, the molten materials from different extruder barrels need to be redistributed ...

AI Technical Summary

Problems solved by technology

At present, most of the equipment used for composite co-extrusion is composed of two or more than two screw extruders, and different materials are extruded into the co-extrusion die for compounding. The equipment investment is large and complex, and the equipment occupies an area of Larger, especially the more layers of composite products, the more prominent this problem is, in addition, the molten materials from different extruder barrels need to be redistributed to meet the requirements of the designed product shape, the molten polymer is distributed In the process, different flow areas are caused, resulting in different melting temperature and residence time distribution, which not only has low efficiency, but also affects the appearance and quality of the product.

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