Pre-oxidation furnace

Abstract

The invention discloses a pre-oxidation furnace. The pre-oxidation furnace comprises a furnace body shell, a roller, a circulating fan and an exhaust fan, wherein the circulating fan and the exhaust fan are connected with the furnace body shell by virtue of connecting pipelines, two ends of the furnace body shell are provided with furnace end humidifying devices, a humidifying pipe is arranged inside each furnace end humidifying device, a humidifying hole is formed in the humidifying pipe, and each humidifying pipe is connected with a humidifying liquid storage tank by virtue of a connecting pipeline. Two ends of the pre-oxidation furnace are provided with the furnace end humidifying devices, so that in the pre-oxidation production process, the mechanical abrasion and damage of carbon fibers can be greatly reduced, the quantity of broken filaments on the surface of the carbon fibers can be greatly reduced, a pre-oxidized filament obtained by pre-oxidizing carbon fiber crude filaments by virtue of the pre-oxidation furnace basically has no skin-core structure or has a slightly skin-core structure, the tensile strength and the tensile elastic modulus of the carbon fibers prepared by carbonizing the pre-oxidized filament are greatly improved, and the carbon fibers are not prone to break.

Description

technical field [0001] The invention relates to the field of carbon fiber production equipment, in particular to a pre-oxidation furnace. Background technique [0002] In the middle and late 20th century, carbon fiber began to be widely used in aerospace, sporting goods and other fields due to its excellent performance as a fiber-reinforced composite material. The carbon fiber manufacturing process includes pre-oxidation, carbonization, surface treatment and other steps, and each step has an important impact on the quality of carbon fiber. High-performance, high-quality carbon fiber requires the performance of the product to maintain good uniformity and stability. For the production of high-performance carbon fibers, the performance and uniformity of raw materials in the production process, the production conditions of each step of pre-oxidation and carbonization, and the stability of production equipment all directly determine the final performance of carbon fiber products...

AI Technical Summary

Problems solved by technology

Since the double diffusion process of the carbon fiber precursor is from the surface to the inside during solidification into fibers, it has a slight skin-core structure; and the existing pre-oxidation furnace is also carried out from the surface to the inside during the pre-oxidation process, so The pre-oxidation process will intensify the skin-core structure, and the skin-core structure of the pre-oxidized wire will eventually cause the mechanical properties of carbon fibers to gradually decrease from the surface to the inside, and the mechanical properties of carbon fibers are generally lower

[0004] Patent CN201193260Y discloses a pre-oxidation furnace, which is provided with a base, a roller, an exhaust duct, a circulation fan, a return air duct, and an air supply duct. However, this patent mainly solves the problem that the existing oxidation furnace has poor sealing performance and isothermal zone The problem of unevenness, the improvement of the pre-oxidized silk sheath-core structure is not mentioned

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