Method for reducing needling density of polyimide fiber felt

Abstract

The invention relates to a method for reducing the needling density of a polyimide fiber felt, and belongs to the technical field of textile processing. According to the method, a fluffy polyimide fiber mesh after opening, combing and lapping is subjected to negative pressure adsorption when passing a needling table under the condition of negative pressure, and the adsorbed polyimide fiber mesh retracts in a negative pressure running direction, so that the polyimide fiber mesh is compact. Besides, an upper needling plate needle positioned on the needling table performs needling on the retracted polyimide fiber mesh. The negative pressure adsorption action on polyimide fiber bundles by the negative pressure solves the problem of fluffy property of the polyimide fiber mesh due to low moisture regain and poor static electricity resistance of polyimide fibers, on the premise of similarity of the volume density of the polyimide fiber felt and the conveying speed and the needling frequency of the polyimide fiber mesh, the needling density is reduced, so that the needling efficiency and the final product quality of the polyimide fiber felt are improved, and production cost is reduced.

Description

technical field [0001] The invention relates to a method for reducing the needle-punched density of polyimide fiber felt, which belongs to the technical field of textile processing. Background technique [0002] Polyimide fiber mat is characterized by its high temperature resistance, low temperature resistance, corrosion resistance, self-lubrication, low wear, excellent mechanical properties, good dimensional stability, small thermal expansion coefficient, high insulation, low thermal conductivity, no melting, no rust, etc. . It is used to replace metals, ceramics, PTFE and engineering plastics, and is widely used in petrochemical, mining machinery, precision machinery, automobile industry, microelectronic equipment, medical equipment, aviation, aerospace, microelectronics, nano, liquid crystal, Separation membrane, laser and other fields. The production process of the conventional polyimide fiber mat is to lay the polyimide fiber after opening and carding, and use a needl...

AI Technical Summary

Problems solved by technology

Its shortcoming is that in the process of forming polyimide fiber felt by needle punching, the needle punching method adopted is the conventional needle punching method, because the polyimide fiber has low moisture regain and poor antistatic ability, resulting in polyimide The amine fiber web is fluffy, the formation efficiency of fiber bundles is low, and the efficiency of needle punching to achieve compaction is low, resulting in a higher needle punching density to achieve the required volume density of the product, which will cause greater damage to the polyimide fiber. The quality of the finished fiber mat is not good; and due to the static electricity between the polyimide fiber bundles, the interlayer strength of the polyimide fiber mat is low

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