CN107675365A - A kind of negative pressure needle-punching method of quartz fiber felt - Google Patents

Abstract

The invention relates to a negative pressure acupuncture method for quartz fiber felt, which belongs to the technical field of textile processing. The method refers to that in the quartz fiber mat needling process, when the opened, carded and laid quartz fiber web passes through the upper surface of the needle punching table, negative pressure is applied to the fluffy quartz fiber web under negative pressure. Pressure adsorption, the adsorbed quartz fiber web shrinks in the direction of negative pressure operation, while the quartz fiber web shrinks, the upper acupuncture plate above the acupuncture table performs acupuncture on the shrunk quartz fiber web. The negative pressure first absorbs and shrinks the fluffy quartz fiber net to make the quartz fiber net dense, reduces the number of needle punches, and reduces the damage to the fiber; The smoothness leads to the problem of low needle punching efficiency of the quartz fiber mat, thereby improving the needle punching effect and the quality of the finished product of the quartz fiber mat, and reducing the production cost.

Description

A negative pressure acupuncture method for quartz fiber felt

technical field

The invention relates to a negative pressure acupuncture method for quartz fiber felt, which belongs to the technical field of textile processing.

Background technique

Quartz fiber felt is due to its characteristics of chemical corrosion resistance, fire prevention, flame retardant, waterproof, aging resistance, weather resistance, insulation and so on. It is widely used as fiberglass base cloth, anti-corrosion, heat preservation, fire-proof and flame-retardant, waterproof material, sound insulation material, thermal lining material, filter material, epoxy copper clad board and electrical insulation products, etc. The production process of conventional quartz fiber felt is to open and comb the quartz fiber before laying the net, and use a needle with a barb to pass through several layers of quartz fiber nets for needle punching. When the needles penetrate the quartz fiber net, the quartz The fiber bundles pass through the quartz fiber nets, and the fiber bundles run through between different layers of quartz fiber nets. On the one hand, the interlayer strength between the quartz fiber nets is increased; on the other hand, the quartz fibers in each layer of fiber nets are changed from a fluffy state. It changes to a compact state and gradually forms a quartz fiber felt with interlayer strength. The effect of acupuncture includes compaction and reinforcement. The living quartz fiber passes through the quartz fiber net layer with the needle, and the quartz fiber intertwines and entangles with each other to form a fiber bundle during the movement, which makes the quartz fiber net squeeze to a certain extent and compresses the quartz fiber net. After the needle penetrates into a certain depth, it rises up. At this time, the crochet is in the forward direction, and the quartz fiber leaves the barb and stays in the quartz fiber net in a nearly vertical state to form a riveting effect to realize the acupuncture process, so that the quartz fiber net is riveted to achieve reinforcement. Purpose. For example, Chinese Patent Publication No. CN1886542A, published on December 27, 2006, the name of the invention is "needle-punched glass mat". Needle-punched the thread layer to obtain a glass mat. Its disadvantage is that in the process of forming quartz fiber felt by needle punching, due to the smooth surface of the quartz fiber, when the needle barbs to form a fiber bundle, some quartz fibers have a low friction coefficient, resulting in low fiber bundle formation efficiency, resulting in a dense needle punching. The efficiency is low, which eventually leads to low interlayer strength of the quartz fiber mat.

Contents of the invention

For the above-mentioned problems, the object of the present invention is to provide a negative pressure acupuncture method for quartz fiber felt. In order to achieve the above-mentioned purpose, its technical solution is:

A negative pressure acupuncture method for quartz fiber felt, said quartz fiber felt negative pressure acupuncture method refers to that a negative pressure device is set under the acupuncture table, and the quartz fiber web after opening, carding and laying is 5- When the conveying speed of 15m/min passes through the upper surface of the acupuncture table, the fluffy quartz fiber web is subjected to negative pressure adsorption under the condition of a negative pressure of 0.1-5MPa in the negative pressure device, and the adsorbed quartz fiber web runs toward the negative pressure. Direction shrinkage, while the quartz fiber web shrinks, the needles on the upper needle punching board above the needle punching table perform needle punching on the shrunk quartz fiber web at a frequency of 1000-2000 times/min, and the needle density of the upper needle punching board is 1000- 2000 pieces/m.

Due to the adoption of the above technical scheme, the present invention needles the opened, carded and laid quartz fiber web under negative pressure conditions without changing the existing quartz fiber felt needle punching process. The negative pressure of the negative pressure device performs negative pressure adsorption on the fluffy quartz fiber net. Due to the air flow formed by the negative pressure of the negative pressure device, the quartz fiber in the quartz fiber net is placed on the acupuncture table, and the gap between the quartz fibers is reduced. The bottom quartz fiber mesh first shrinks in the direction of negative pressure, then the upper quartz fiber mesh and the bottom quartz fiber mesh gradually shrink in the direction of negative pressure, and finally the quartz fiber mesh shrinks in the direction of negative pressure as a whole, the volume density increases, and the quartz fiber mesh to a dense state. While the quartz fiber net shrinks, the upper needling plate above the needling table performs acupuncture on the shrunk quartz fiber net. Since the quartz fiber net reaches a dense state before needling, the number of quartz fibers per unit volume increases. , the friction between the quartz fibers increases. When the needle punches the shrunk quartz fiber web, the falling of the needle drives the amount of quartz fibers in the quartz fiber bundle to increase, and the increase in the amount of quartz fibers and the friction between the quartz fibers increase. The large size leads to the tightness of the quartz fiber bundles and the enhanced cohesion, which strengthens the riveting effect of the quartz fiber bundles, increases the interlayer strength between the quartz fiber meshes, and the negative pressure adsorption on the quartz fiber bundles overcomes the smooth surface of the quartz fibers. This leads to the problem of low needle punching efficiency of the quartz fiber web. Therefore, by adopting this technical scheme, the negative pressure first absorbs and shrinks the fluffy quartz fiber net to make the quartz fiber net compact, which reduces the number of needle punches, reduces the damage to the quartz fiber caused by the puncture, and affects the compacted quartz fiber. Acupuncture of the net improves the acupuncture effect of the quartz fiber felt and the quality of the finished product, and this method improves the needle punching efficiency of the quartz fiber felt, increases the volume density and product quality of the quartz fiber felt, and reduces the production cost.

detailed description

The negative pressure acupuncture method of quartz fiber felt of the present invention will be further described in detail below in conjunction with specific examples: a negative pressure acupuncture method of quartz fiber felt, which is a method without changing the quartz fiber felt in the existing quartz fiber felt needle punching process. Fiber opening and carding, quartz fiber web laying, and quartz fiber web acupuncture processes, 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 net passes through the upper surface of the acupuncture table at a conveying speed of 5-15m/min, the fluffy quartz fiber net is subjected to negative pressure adsorption under the condition of a negative pressure of 0.1-5MPa in the negative pressure device, and the adsorbed quartz fiber net Shrink in the direction of negative pressure operation, while the quartz fiber web shrinks, the needles on the upper needle punching board above the needle punching table perform needle punching on the shrunk quartz fiber web at a frequency of 1000-2000 times/min, and the needles on the upper needle punching board The density is 1000-2000 pieces/m. Negative pressure first absorbs and shrinks the fluffy quartz fiber net, which makes the quartz fiber net tightly connected, reduces the number of needling, reduces the damage to the quartz fiber, and improves the needling effect of the quartz fiber mat and the quality of the finished product. , and the method improves the needling efficiency of the quartz fiber felt, increases the volume density and product quality of the quartz fiber felt, and reduces the production cost.

specific embodiment

Example 1

After the quartz fiber has been opened, carded and laid, the quartz fiber web passes through the upper surface of the acupuncture table at a conveying speed of 5m/min, and the fluffy quartz fiber web is treated under the condition of a negative pressure of 0.1MPa generated by a vacuum pump. Negative pressure adsorption, the adsorbed quartz fiber web shrinks in the direction of negative pressure operation, the needles on the upper needling board above the acupuncture table perform acupuncture on the adsorbed quartz fiber web at a frequency of 1000 times/min, and the upper needling board The needle density is 1000 pieces/m. The quartz fiber mat after negative pressure needle punching was cut and weighed.

Example 2

After the quartz fiber has been opened, carded and laid, the quartz fiber web passes through the upper surface of the acupuncture table at a conveying speed of 10m/min, and the fluffy quartz fiber web is treated under the condition of a negative pressure of 0.1MPa generated by the centrifugal fan. Negative pressure adsorption is performed, and the adsorbed quartz fiber web shrinks in the direction of negative pressure operation. The needles of the upper acupuncture plate above the acupuncture table perform acupuncture on the adsorbed quartz fiber web at a frequency of 1500 times/min. The needle density of the board is 1500 pieces/m. The quartz fiber mat after negative pressure needle punching was cut and weighed.

Example 3

After the quartz fiber has been opened, carded and laid, the quartz fiber web passes through the upper surface of the acupuncture table at a conveying speed of 15m/min, and the fluffy quartz fiber web is treated under the condition of a negative pressure of 0.1MPa generated by a vacuum pump. Negative pressure adsorption, the adsorbed quartz fiber web shrinks in the direction of negative pressure operation, the needles on the upper acupuncture plate above the acupuncture table perform acupuncture on the adsorbed quartz fiber web at a frequency of 2000 times/min, and the upper acupuncture plate The needle density is 2000 pieces/m. The quartz fiber mat after negative pressure needle punching was cut and weighed.

Example 4

After the quartz fiber has been opened, carded and laid, the quartz fiber web passes through the upper surface of the acupuncture table at a conveying speed of 15m/min, and the fluffy quartz fiber web is negatively charged under the condition of a negative pressure of 3MPa generated by a vacuum pump. Pressure adsorption, the adsorbed quartz fiber web shrinks in the direction of negative pressure operation, and the needles on the upper acupuncture board above the acupuncture table perform acupuncture on the adsorbed quartz fiber web at a frequency of 2000 times/min, and the needles on the upper acupuncture board The density is 2000 pieces/m. The quartz fiber mat after negative pressure needle punching was cut and weighed.

Example 5

After the quartz fiber has been opened, carded and laid, the quartz fiber web passes through the upper surface of the needle punching table at a conveying speed of 15m/min, and the fluffy quartz fiber web is subjected to negative pressure under the condition that the negative pressure generated by the vacuum pump is 5MPa. Pressure adsorption, the adsorbed quartz fiber web shrinks in the direction of negative pressure operation, and the needles on the upper acupuncture board above the acupuncture table perform acupuncture on the adsorbed quartz fiber web at a frequency of 2000 times/min, and the needles on the upper acupuncture board The density is 2000 pieces/m. The quartz fiber mat after negative pressure needle punching was cut and weighed.

Table 1 Comparison table of bulk density of quartz fiber felt after negative pressure needle punching and quartz 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 quartz fiber net, the volume density of the quartz fiber mat after acupuncture increases, and the quartz fiber mat is denser. As the negative pressure of the negative pressure device increases, the volume of the quartz fiber mat increases. The density increases. It can be seen that the negative pressure improves the needle punching effect of the quartz fiber felt.

Claims (1)

1. a negative pressure acupuncture method for quartz fiber felt, comprising quartz fiber opening and carding in the quartz fiber felt needle punching process, quartz fiber web laying, quartz fiber web needle punching, characterized in that: described quartz fiber Mesh acupuncture means that a negative pressure device is installed under the acupuncture table. When the quartz fiber mesh after opening, carding and netting passes through the upper surface of the acupuncture table at a conveying speed of 5-15m/min, the negative pressure of the negative pressure device Negative pressure adsorption is carried out on the fluffy quartz fiber net under the condition of pressure of 0.1-5MPa. After the adsorption, the quartz fiber net shrinks in the negative pressure running direction. The puncture needles are used to puncture the shrunk quartz fiber web at a frequency of 1000-2000 times/min, and the needle density of the upper needle-punching board is 1000-2000 pcs/m.