Introduction Of Hygroscopic And Quick Drying Nonwovens Shoes Materials

< p > < a > href= > http://www.91se91.com/ > > nonwoven material > /a > moisture absorption and quick drying are determined by 4 processes: wetting, moisture absorption, dehumidification and evaporation of nonwoven materials.

Because there are two kinds of sweat in human body: liquid and gaseous water.

The first is the direct contact of liquid moisture with nonwoven materials. The inner surface of the nonwoven material is wetted and absorbed by nonwoven material in the form of liquid water, and it is pported to the outer surface of the nonwoven material by the capillary action formed by the gap between the fibers, and then evaporated into water vapor and diffused into the outer space.

Two, evaporated water vapor is absorbed directly on the surface of non-woven material, and is condensed into liquid water on the surface of nonwoven material, and then pferred to the outer surface of nonwoven material by the same mechanism, evaporating into steam and migrating to outer space.

Because the moisture absorption and sweating process of nonwovens is a comprehensive physical process, the different raw materials, nonwovens structure and finishing process will have different effects on the different stages of the comprehensive physical process.

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< p > there are 4 steps in the process of moisture absorption and quick drying of nonwovens. The wetting and moisture absorption process determines the moisture absorption properties of nonwoven materials, and dehumidification and evaporation determine the quick drying properties of nonwoven materials.

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< p > < strong > experimental operation, the key data < /strong > /p >

< p > moisture diffusion refers to the gradual expansion of the moisture absorbed by nonwoven materials from the surface of the inner surface of the nonwoven material and the moisture absorbed by the nonwoven material to the non-woven material.

The diffusion process of moisture diffusion mainly depends on the capillary action formed by the cavity inside the fiber, the groove on the surface of the single fiber, and the crevice of the nonwoven material.

Therefore, the fiber profile heterogeneity, fine denier, single fiber surface morphology and the density of nonwoven material structure have a significant effect on enhancing the moisture conductivity of nonwoven materials.

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< p > evaporation refers to the evaporation of non-woven materials absorbed into outer space, thus realizing the quick drying process of nonwoven materials.

If there are too many hydrophilic groups in fiber chemical structure (such as cotton fiber, viscose fiber, etc.), it is obviously not conducive to quick drying. On the contrary, reducing the number of hydrophilic groups or increasing the non hydrophilic synthetic fibers can improve the quick drying performance. At the same time, increasing evaporation specific surface area, cross-sectional profile, fine denier and surface roughening can also accelerate the evaporation rate and improve the dry speed performance.

The ambient temperature and air velocity also play an important role in the evaporation process of nonwovens.

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< p > Design 4 kinds of viscose and polyester mixture ratio, 10, 0, 10: 1, 10: 2, 10: 3 (viscose: polyester), the sample numbers are 1, 2, 2, and 2, respectively.

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< p > electronic scale is used to weigh two kinds of < a href= "http://www.91se91.com/" > fiber > /a > 1, 2, 3 and 4 respectively. The amount of viscose is 5kg, and the amount of polyester is 0kg, 0.5kg, 1kg and 1.5kg.

The fiber is initially mixed by number and then laid on the feeding curtain.

The fiber is fed into the cotton opener by feeding curtain, and the loose fibers in the opener are fed to the cotton machine through the air channel.

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< p > > a href= "http://www.91se91.com/" > the distance between the rollers of the carding machine < /a > directly affects the carding effect, which is an important way of adjusting besides adjusting the speed ratio among the rollers.

The distance between the rolls in the experiment is as follows: < /p >

< p > there are 3 ways of acupuncture in the course of this research. They are 3 processes, namely, pre piercing, barbed needles and main needles. The needling machine used is produced by Taiwan first line machinery industrial Limited by Share Ltd and its model is SNP250H4.

The number of needles in the pricker is 8250 needles, the horsepower is 15, the width is 2.5 meters, the working frequency is 2.5 meters, the needle frequency is 650HZ, the number of needles in the barbed needles is 3300 needles /m, the horse power is 22, the acupuncture frequency is 1000HZ, the stroke is 50m/min, the needle label is 15 x 18 * 40 * 3 R330, the number of unit needles of the main stab machine is 3300 needle /m, the horse power is 22, the acupuncture frequency is 1200HZ, the journey is 26m/min, the needles used are 22, x, x, and X * R330.

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< p > based on GB/T 21655.1 - 2008, evaluation of moisture absorption and dryness. Part I: single combination test method to evaluate moisture absorption and quick drying performance.

The experiment was carried out under three standard atmospheric conditions. The instruments and devices used in the experiment were: electronic balance, precision 0.001g, burette, 1ml, timer, precision 0.1s, capillary effect instrument, thermometer, sample suspension device.

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< p > before the experiment, the sample was lowered in the relaxation state by the wet balance. Under normal circumstances, the natural fiber sample was wetted for more than 16 hours, and the synthetic fiber sample was at least 2 hours. The sample with a constant moisture regain rate of 0 did not need to be dampening.

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< p > raw materials and instruments < /p >

< p > Dan Xilin single way carding machine (Jin an Machinery Co., Ltd.), the experimental raw material is viscose fiber and polyester fiber, polyester fiber is produced by Taiwan Qi trade Industrial Limited by Share Ltd, viscose fiber is produced by the Far East advanced fiber Limited by Share Ltd.

The morphology and mechanical properties of the two fibers are shown in the table below.

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< p > water absorption test < /p >

< p > take three samples with a size of 10cm * 10cm flat and non wrinkle. The quality of the sample is called M0, then the sample is completely entered into the volume of three level water. After 5min, the sample is taken out, and the sample is vertically suspended vertically. Until the water drops, the quality of the sample is m, and the water absorption rate is calculated.

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< p > data analysis to determine the best process < /p >

The water absorption test data of < p > different proportioning samples are shown in the following table.

It can be seen from the following table that the water absorption rate of nonwoven materials decreases with the decrease of the proportion of viscose fiber.

This is because viscose fiber molecular structure contains a large number of hydroxyl (- OH) groups, which can adsorb large amounts of water molecules, and the viscose fibers have larger molecular gap and loose arrangement, which greatly improves the polarity and moisture absorption ability of fibers.

With the decrease of viscose fiber content, the hydrophilic group in the nonwoven material decreases, so the moisture absorption becomes worse and the water absorption decreases.

The data in the table show that the water absorption rate of the test sample meets the requirements. Of course, the higher the water absorption rate is, the more obvious the moisture absorption effect is.

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< p > drip diffusion time test results are shown below.

A, B, C and D are the traces of the 1, 2, 3 and 4 water diffusion at the end of the test.

The diffusion time of drip water can reflect the characteristics of water diffusion and water conduction from the side.

It can be seen from the data in the following table that the drop diffusion time of nonwoven materials increases with the decrease of the proportion of hydrophilic fibers in non-woven materials.

According to theoretical research, the volume of absorption of certain volume droplets in non-woven materials with thickness of H is inversely proportional to the thickness of h of non-woven materials and the square of the cosine of contact angles. Therefore, under a certain thickness and contact angle, the larger the proportion of polyester fiber, the harder the non-woven material is wetting, which is not conducive to the diffusion and conduction of water.

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< p > evaporation time and rate test results are shown in the table below.

According to the data in the table, the evaporation rate of nonwoven materials is inversely proportional to the content of viscose fibers in non-woven materials. The smaller the viscose fiber content, the greater the evaporation rate of nonwoven materials.

This is due to the fact that there are too many hydrophilic groups in nonwovens, and some moisture exists in the form of bound water in nonwoven materials.

The test sample 4 meets the requirements for evaporation rate in moisture absorption and quick drying technology.

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< p > the test results of core suction height are shown in the following table.

It can be seen from the table that the wicking height of nonwoven materials decreases with the decrease of viscose content in non-woven materials, and the core suction height directly reflects the moisture conductivity of nonwoven materials. The moisture conduction in nonwoven materials is due to the capillary effect force of water, the greater the capillary effect force and the higher the height value.

The sample is made by needling method and penetrated through the fiber inside the product. In the process of water conduction, fiber acts as capillary tube, so the thinner the fiber, the thinner the capillary is, and the bigger the core suction height is.

The difference in vertical and horizontal direction is due to the fact that most fibers in the nonwoven materials are horizontally arranged horizontally and are conducive to pverse water conduction.

This topic requires the higher the core suction height of nonwovens.

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< p > the moisture permeability of nonwoven materials with different ratios was measured by evaporation method.

It can be seen from the diagram that the moisture permeability of nonwoven materials is inversely proportional to the content of viscose fibers in nonwoven materials. The more hydrophilic groups in nonwoven materials, the worse the moisture permeability of nonwoven materials.

This is due to the expansion of viscose fibers in nonwovens, which is not conducive to water conduction. Polyester fibers play a role in capillary core, which is conducive to the pmission of moisture from one side to the other side, and polyester fiber increases, and its moisture permeability increases.

The test sample 4 meets the requirement of moisture permeability.

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< p > experiments show that the No. 4 sample finally meets the technical requirements of moisture absorption and quick drying of non-woven materials. It can be seen that the blending technology of hydrophilic fibers and polyester fibers can be used as a method to improve the moisture absorption and quick drying performance of products.

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< p > discussion area < /p >

< p > find the best collocation in fiber mix ratio < /p >

< p > flax fiber is reinforced composite material < a target= "_blank" href= "http://www.91se91.com/" > shoes < /a > material should have good moisture absorption and sweat perspiration performance. If sweat is accumulated in shoes for a long time, it will cause excessive moisture inside the shoes, which will affect the comfort of shoes, and there will also be slippage.

This kind of slip phenomenon is a terrible hidden danger in some jobs or sports.

In this paper, viscose fiber and polyester fiber are used as raw materials, and 10 kinds of fiber mixing ratios of 0 to 10, 1, 10: 2, 10 to 3 are designed. The non-woven material shoe material is made by needling reinforcement and hot pressing. The performance indexes such as water absorption, drip diffusion time, evaporation time, core suction height and moisture permeability are tested, so as to select the best fiber to mix ratio and develop moisture absorption and quick drying nonwovens.

This is the author Liu Huanglin < /p >.

< p > nonwoven nano antibacterial finishing is worth looking forward to < /p >

"P >" I think that no matter how to adjust the ratio of viscose and polyester fibers, it is not a fundamental solution to the problem of the poor moisture content. This is the defect of the raw material itself, but in recent years, researchers have studied the nonwoven antibacterial shoe material of nonwoven fabric, which is the nano antibacterial finishing to the elastic nonwoven fabric, and then the nano antibacterial elastic nonwovens are processed into the shoe material.

It is said that the shoe material processed by this method has excellent elasticity and antibacterial deodorization function, and the insole product has different characteristics from traditional products.

I haven't used this product yet, but I really want to get in touch with it.

Jin Minjian, general manager of Taizhou Hua Min shoe material Co., Ltd. < /p >

< p > the problem of high formaldehyde content is still unsolved. < /p >

< p > at present, in the south, such as Quanzhou, Guangzhou, Shenzhen and other places, although the scale of shoe materials is relatively large and output is large, there is basically no innovation in technology.

The main problem is that the problem of high formaldehyde content is not solved in terms of viscose. Although the shape and comfort are good after finishing, the moisture permeability is very low and the air permeability is very poor.

Although theory 10: 3 can be said to be an ideal ratio of raw materials, such matching does not solve the problem of high formaldehyde content. Therefore, I think that the problem of moisture absorption and quick drying of shoe materials should be further studied.

-- Zhang Yu, director of Technology Department of Panyu shoe material Co., Ltd., /p

< p > 10: 3 practice proved to be the best proportion < /p >.

< p > the sweat glands of the soles of the feet remove a large amount of sweat, and at the same time emit a lot of heat. This creates a damp and hot environment inside the shoes. This environment is conducive to the reproduction of bacteria, which will cause many kinds of diseases such as beriberi, and at the same time it will stink. This problem is difficult to solve thoroughly.

The proportion of viscose fiber and polyester fiber used by the company is about 3: 1, which is not the same as the 10 to 3 conclusion.

Under this ratio, the moisture permeability of shoe material is the best.

-- Guangdong Teti nonwoven shoe material company technician Ye Zong < /p >