Humidification treatment method and device for unwinding polyacrylonitrile precursors for carbon fibers during carbonization

Abstract

The present invention relates to a method and device for humidifying and treating polyacrylonitrile precursors for carbonization of carbon fibers; the polyacrylonitrile precursors are drawn, and the tows are clamped by cotton cloth in a humidifying device above the comb teeth before the filaments are separated. Cotton cloth contact, control the water volume through the water flow control ball valve on the desalinated water delivery pipe, and drop water to the cotton cloth, tow and wet cotton cloth clip on the cotton cloth clip in the humidification device through the perforated water spray pipe on the upper part of the cotton cloth clip contact with the cotton cloth, so that the tow is moistened by desalinated water, and the tow with a wet surface and good bundling property is obtained; this method solves the problems of high static electricity, many wool filaments, and poor bundling property of the polypropylene raw silk, and the qualified rate of the product is improved. About 3%, the strength index increased by 0.4GPa.

Description

[0001] Technical field: [0002] The invention relates to a method and a device for humidifying polyacrylonitrile precursors during unwinding in the carbonization production process of carbon fibers. [0003] Background technique: [0004] In the process of producing carbon fiber, the raw polyacrylonitrile yarn is drawn by the transmission device, and the raw yarn is withdrawn with a constant tension. Each heating process of carbonization is completed through multiple heating furnaces, and finally carbon fibers are produced. During the unwinding of the raw silk, if the raw silk has the problems of many wools, high static electricity, and poor bundling, in the subsequent carbonization production process, it is easy to break the silk and easily entangle the roller, making it difficult to run smoothly, and the production stability becomes poor. The rate of qualified products decreased. Scientists in this field are actively seeking ways to eliminate static electricity, reduce fuz...

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