Crawler-type mixing device for long fiber reinforced thermoplastic composite material

Abstract

The invention relates to a crawler-type mixing device for a long fiber reinforced thermoplastic composite material. The crawler-type mixing device comprises a housing and two groups of crawler mechanisms distributed in parallel; a feed opening and a discharge opening are correspondingly formed in two opposite side walls of the housing; the crawler mechanisms are mounted and fixed in the housing; apassage used for transporting a mixture is formed between the two groups of crawler mechanisms; bulges used for extruding the mixture in the passage are formed in the surfaces of the crawlers on thesurfaces of the crawler mechanisms; a closed structure is formed between each of the two side edges of the passage and the inner wall of the housing; and openings in the feed end and the discharge endof the passage are in one-to-one correspondence with the feed opening and the discharge opening and communicate with the feed opening and the discharge opening. A fiber yarn is subjected to fixed length cutting off by a roller cutter, is only preliminarily mixed with thermoplastic resin, and is extruded by the waved bulges on the outer walls of the crawlers in the mixing device, so that the sufficient mixing of a blank is ensured, the shearing wear to fibers is reduced, and the improving effect of the mechanical property of a product is remarkable.

Description

technical field [0001] The invention relates to the technical field of composite material equipment, in particular to a crawler-type mixing equipment for long fiber reinforced thermoplastic composite materials. Background technique [0002] Fiber-reinforced thermoplastic composite materials are widely used in automobiles, electrical appliances, rail transit, construction industries, civil and light industries and other fields due to their excellent characteristics of light weight, high strength, environmental protection and recyclability. [0003] The mixing process of fiber and thermoplastic resin is an important link to determine the performance of thermoplastic composite materials. At present, the more mature mixing equipment includes the D-LFT production line of Coperion W&P Company of Germany and the LFT-D-ILC of Dieffenbacher Company of Germany. production line. The cutting and dispersion of fibers in the above production line and the mixing of fibers and thermoplasti...

AI Technical Summary

Problems solved by technology

The cutting and dispersion of fibers in the above production line and the mixing of fibers and thermoplastic resin are carried out in the screw extruder. In order to achieve a better mixing effect, the fiber inlet is usually set at the front end of the extruder. During the cutting and mixing process, the resulting problem is: the shearing effect of the screw on the fiber is obvious. Generally, the actual length of the fiber is 5-10mm, which is far less than the design length of the fiber of 15-25mm, resulting in a significant decrease in the performance of the product.

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