Process for producing carbon fibers with less damage

Abstract

The invention discloses a process for producing carbon fibers with less damage. The process comprises the following steps of a, unwinding of filaments and collection of lines, wherein raw filaments are selected, and new filaments and old filaments are connected through heat-resistant fibers after bundle separation and erected on a line collecting plate; b, initial drying, wherein the line collecting plate and the raw filaments are conveyed into a drying device for drying to remove moisture contained in the raw filaments; c, pre-oxidation, wherein the dried raw filaments are fed into three pre-oxidation ovens arranged continuously for pre-oxidation; d, carbonization; e, surface treatment; f, sizing; g, filament collection. The process has the advantages that by adopting yarn expanding equipment adjustable in height in a sizing process and adjusting the height of yarn expanding fixed rollers, the tension of yarn can be adjusted, so that the stress of the carbon fibers is released, the carbon fibers are protected from fuzzing, damage and twisting, and therefore the production quality of the carbon fibers is improved.

Description

technical field [0001] The invention relates to the technical field of carbon fiber production, in particular to a carbon fiber production process with little damage. Background technique [0002] Carbon fiber is a new type of material made from organic matrix fibers by pyrolysis. It has the characteristics of high temperature resistance, friction resistance, electrical conductivity, thermal conductivity and corrosion resistance. Its shape is fibrous and can be processed into various fabrics. The carbon fiber graphite microcrystalline structure is preferentially oriented along the fiber axis, so it has high strength and modulus along the fiber axis direction, and its own density is small, and the specific strength and specific modulus are high. In the prior art, carbon fiber is often used as a reinforcing material to be compounded with resin, metal, ceramics and carbon, etc., and processed into a high-strength composite material. Among them, the specific strength and specif...

AI Technical Summary

Problems solved by technology

The texture of carbon fiber is relatively brittle. In the process of carbon fiber prepreg, hairs will be generated during the process of carbon fiber spinning, which will have a negative impact on product quality; and when carbon fiber is processed into thermosetting resin-based composite materials, the curing process is irreversible. If the carbon fiber has defects (such as surface damage), the material has to be scrapped, resulting in high production costs