CN107558002A - A kind of method for improving carbon fiber felt feed increcement - Google Patents

Abstract

The invention relates to a method for improving the needle punching efficiency of carbon fiber felt, which belongs to the technical field of textile processing. The method refers to that in the carbon fiber felt needling process, when the carbon fiber net after opening, carding and netting passes through the upper surface of the needling table, the fluffy carbon fiber net is subjected to negative pressure adsorption under negative pressure conditions, The adsorbed carbon fiber net shrinks in the direction of negative pressure operation. While the carbon fiber net shrinks, the upper acupuncture plate above the acupuncture table performs acupuncture on the shrunk carbon fiber net. The negative pressure first absorbs and shrinks the fluffy carbon fiber net to make the carbon fiber net dense, reduces the number of needling times, and improves the needling efficiency of the carbon fiber felt; the negative pressure adsorption of the carbon fiber bundle by the negative pressure overcomes the carbon fiber due to the smooth surface The needling efficiency of the carbon fiber mesh is low, thereby improving the needling effect of the carbon fiber felt and improving the quality of the finished product, and reducing the production cost.

Description

A Method for Improving Needling Efficiency of Carbon Fiber Felt

technical field

The invention relates to a method for improving the needling efficiency of carbon fiber felt, which belongs to the technical field of textile processing.

Background technique

Carbon fiber felt has high axial strength and modulus, low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, good fatigue resistance, acid and alkali resistance, high temperature resistance, non-combustibility, oxidation resistance, and sound insulation. Good X-ray permeability, good electrical and thermal conductivity, good electromagnetic shielding, etc. Carbon fiber felt has been widely used in various fields of military and civilian industries. From civilian industries such as aerospace, aviation, automobiles, electronics, machinery, chemicals, and textiles to sports equipment and leisure products. Carbon fiber reinforced composite materials can be used in military fields such as aircraft manufacturing, industrial fields such as wind power blades, electromagnetic shielding materials, artificial ligaments and other body substitute materials, as well as for the manufacture of rocket shells, motor ships, industrial robots, automotive leaf springs and Drive shafts, etc., sports fields such as bats. The production process of conventional carbon fiber felt is to open and comb the carbon fiber before laying the net, and use a barbed needle to penetrate several layers of carbon fiber net for needle punching. When the needle penetrates into the carbon fiber net, the carbon fiber bundle formed passes through the carbon fiber. The fiber bundles run through different layers of carbon fiber meshes, on the one hand, it increases the interlayer strength between the carbon fiber meshes, and on the other hand, it also makes the carbon fibers in each layer of fiber meshes change from a fluffy state to a dense state, gradually forming layers with Strong carbon fiber felt between. For example, the Chinese Patent Publication No. CN104999724A, published on October 28, 2015, the name of the invention is "a carbon fiber oxygen-enriched silk needle felt and its preparation method and application". The felt is mainly divided into a primary layer composed of a pre-needled single-layer mesh, a high-density layer composed of two or more layers of carbon fiber oxygen-enriched silk single-layer mesh cloth, and a carbon fiber oxygen-enriched silk main needle that has been needle-punched and calendered. The heat-sealing layer consists of the surface, in which the preliminary pre-layer, high-density layer and heat-sealing layer are made by four composite processes of the main lamination machine and the counter lamination machine. Its shortcoming is that in the process of forming carbon fiber oxygen-enriched silk needle felt by needle punching, due to the smooth surface of carbon fiber, when the needle barbs to form fiber bundles, some carbon fibers have low friction coefficient, resulting in low fiber bundle formation efficiency, resulting in needle punching The efficiency of achieving compactness is low; and due to the small friction of carbon fiber bundles, it is unfavorable for the increase of interlayer strength of carbon fiber oxygen-enriched wire needle felt.

Contents of the invention

In view of the above-mentioned problems, the purpose of the present invention is to provide a method for improving the efficiency of carbon fiber mat needling. In order to achieve the above-mentioned purpose, its technical solution is:

A method for improving the efficiency of carbon fiber felt needle punching, the carbon fiber mesh needle punching means that a negative pressure device is set under the needle punching table, and the carbon fiber mesh after opening, carding and web laying is transported at a speed of 10-20m/min When passing through the upper surface of the acupuncture table, the fluffy carbon fiber mesh is subjected to negative pressure adsorption under the condition of a negative pressure of 0.1-10MPa in the negative pressure device. , the needles on the upper needle punching board above the needle punching table needle the shrunk carbon fiber mesh at a frequency of 1000-1500 times/min, and the density of needles on the upper needle punching board is 2000-3000 pieces/m.

Due to the adoption of the above technical scheme, the present invention needles the carbon fiber web after opening, carding and laying under negative pressure without changing the existing carbon fiber felt needle punching process. The negative pressure of the negative pressure device performs negative pressure adsorption on the fluffy carbon fiber mesh. Due to the airflow formed by the negative pressure of the negative pressure device, the carbon fibers in the carbon fiber mesh are placed on the acupuncture table, and the gaps between the carbon fibers are reduced. The bottom carbon fiber mesh first Shrink in the negative pressure direction, then the upper carbon fiber mesh and the bottom carbon fiber mesh gradually shrink in the negative pressure direction, and finally the carbon fiber mesh shrinks in the negative pressure direction as a whole, the volume density increases, and the carbon fiber mesh reaches a dense state. While the carbon fiber mesh is shrinking, the upper needling plate above the needle punching table needles the shrunk carbon fiber mesh. Since the carbon fiber mesh reaches a dense state before acupuncture, the number of carbon fibers per unit volume increases, and the gap between the carbon fibers increases. The friction force increases. When the needle punches the shrunk carbon fiber mesh, the needle drops to drive the amount of carbon fiber in the carbon fiber bundle to increase. The increase in the amount of carbon fiber and the increase in the friction between the carbon fibers lead to the tightness of the carbon fiber bundle and the enhanced cohesion. As a result, the riveting effect of carbon fiber bundles is strengthened, the interlayer strength between carbon fiber meshes is increased, and the negative pressure adsorption of carbon fiber bundles by negative pressure overcomes the problem of low efficiency of carbon fiber mesh needle punching due to the small surface friction coefficient of carbon fibers. Therefore, by adopting this technical scheme, the negative pressure first absorbs and shrinks the fluffy carbon fiber net to make the carbon fiber net compact, reduces the number of needling, improves the needling efficiency of the carbon fiber felt, and improves the finished product quality of the carbon fiber felt. The bulk density and product quality of the carbon fiber felt are increased, and the production cost is reduced.

detailed description

The carbon fiber felt negative pressure needling method of the present invention will be described in further detail below in conjunction with specific examples: a method for improving the efficiency of carbon fiber felt needling, which is to open and comb carbon fibers without changing the existing carbon fiber felt needling process , carbon fiber web laying, and carbon fiber web acupuncture process, a negative pressure device is installed under the acupuncture table. The negative pressure device can use a vacuum pump or a centrifugal fan. When the conveying speed passes through the upper surface of the acupuncture table, the fluffy carbon fiber mesh is subjected to negative pressure adsorption under the condition of a negative pressure of 0.1-10MPa in the negative pressure device. While shrinking, the needles on the upper needle punching board above the needle punching table needle the shrunk carbon fiber mesh at a frequency of 1000-1500 times/min, and the density of needles on the upper needle punching board is 2000-3000 pieces/m. The negative pressure first absorbs and shrinks the fluffy carbon fiber net, which makes the carbon fiber net tightly connected, reduces the number of needling, improves the needling efficiency of the carbon fiber felt, thereby improves the quality of the finished product, increases the volume density of the carbon fiber felt and the product quality and reduce the cost of production.

specific embodiment

Example 1

After the carbon fiber has been opened, carded and laid, the carbon fiber web passes through the upper surface of the acupuncture table at a conveying speed of 10m/min, and the fluffy carbon fiber web is subjected to negative pressure adsorption under the condition of a negative pressure of 0.1MPa generated by a vacuum pump. , the adsorbed carbon fiber mesh shrinks in the direction of negative pressure operation, and the needles on the upper needle punching board above the needle punching table needle the adsorbed carbon fiber mesh at a frequency of 1000 times/min, and the density of the needles on the upper needle punching board is 2000 pieces /m. The carbon fiber felt after negative pressure needle punching was cut and weighed.

Example 2

When the carbon fiber web after the carbon fiber has been opened, carded and laid passes through the upper surface of the needle punching table at a conveying speed of 15m/min, under the condition that the negative pressure generated by the centrifugal fan is 0.1MPa, negative pressure is applied to the fluffy carbon fiber web. Adsorption, the carbon fiber mesh after adsorption shrinks in the direction of negative pressure operation, and the needles on the upper needle punching board above the needle punching table perform needle punching on the adsorbed carbon fiber mesh at a frequency of 1200 times/min, and the density of the needles on the upper needle punching board is 2500 Pieces/m. The carbon fiber felt after negative pressure needle punching was cut and weighed.

Example 3

After the carbon fiber has been opened, carded and laid, the carbon fiber web passes through the upper surface of the acupuncture table at a conveying speed of 20m/min, and the fluffy carbon fiber web is subjected to negative pressure adsorption under the condition of a negative pressure of 0.1MPa generated by a vacuum pump. , the adsorbed carbon fiber mesh shrinks in the direction of negative pressure operation, and the needles on the upper needle punching board above the needle punching table perform acupuncture on the adsorbed carbon fiber mesh at a frequency of 1500 times/min, and the needle density of the upper needle punching board is 3000 pieces /m. The carbon fiber felt after negative pressure needle punching was cut and weighed.

Example 4

When the carbon fiber web after the carbon fiber has been opened, carded and laid passes through the upper surface of the acupuncture table at a conveying speed of 20m/min, the fluffy carbon fiber web is subjected to negative pressure adsorption under the condition of a negative pressure of 5MPa generated by the vacuum pump. The carbon fiber mesh after adsorption shrinks in the direction of negative pressure operation. The needles on the upper needle punching board above the needle punching table perform needle punching on the adsorbed carbon fiber mesh at a frequency of 1500 times/min. The density of the needles on the upper needle punching board is 3000 pieces/ m. The carbon fiber felt after negative pressure needle punching was cut and weighed.

Example 5

When the carbon fiber web after the carbon fiber has been opened, carded and laid passes through the upper surface of the acupuncture table at a conveying speed of 20m/min, the fluffy carbon fiber web is subjected to negative pressure adsorption under the condition of a negative pressure of 10MPa generated by the vacuum pump. The carbon fiber mesh after adsorption shrinks in the direction of negative pressure operation. The needles on the upper needle punching board above the needle punching table perform needle punching on the adsorbed carbon fiber mesh at a frequency of 1500 times/min. The density of the needles on the upper needle punching board is 3000 pieces/ m. The carbon fiber felt after negative pressure needle punching was cut and weighed.

Table 1 Comparison table of bulk density of carbon fiber felt after negative pressure needle punching and carbon fiber felt produced by conventional needle punching process

It can be seen from Table 1 that due to the effect of negative pressure on the carbon fiber mesh, the volume density of the carbon fiber felt after needle punching increases, and the carbon fiber felt is denser. As the negative pressure of the negative pressure device increases, the volume density of the carbon fiber felt increases. It can be seen that the negative pressure improves the needling efficiency of the carbon fiber felt and improves the needling effect of the carbon fiber felt.

Claims (1)

1. a kind of method for improving carbon fiber felt feed increcement, the carbon fiber shredding comb being included in carbon fiber felt needling process Reason, carbon fiber lapping, carbon fibre web acupuncture, it is characterised in that：Described carbon fibre web acupuncture refers to set below acupuncture platform Negative pressure device, the carbon fibre web after shredding combing and lapping pass through acupuncture platform upper surface with 10-20m/min transporting velocity When, negative-pressure adsorption is carried out to the carbon fibre web of puffy under conditions of being 0.1-10MPa in the negative pressure of negative pressure device, after absorption Carbon fibre web shrinks to negative pressure traffic direction, while carbon fibre web shrinks, upper acupuncture board pricker above acupuncture platform with 1000-1500 times/min frequency carries out acupuncture to the carbon fibre web after contraction, and upper acupuncture board pricker density is 2000-3000 Piece/m.