In the application process of textiles, the structure of the fabric has a great impact on the application performance, and there are a lot of studies on this in the industry. The introduction and conclusions of this article are as follows:
1. The relationship between fabric structure and flame retardant performance
Some people have studied the relationship between the microstructure of the fabric and the flame retardant performance, and the results show that the limiting oxygen index and weight of the fabric have a univariate linear relationship. On this basis, a series of studies have been carried out to show that there is a binary linear relationship between the influence of fabric structure and fabric weight on its combustion performance, that is, under the premise of consistent fabric materials, the shorter the average floating length of fabric weave, the heavier the weight of the fabric, and the higher the limiting oxygen index value of the fabric.
Second, the relationship between the structure of the fabric and the wrinkle resistance of the fabric
The structure of the fabric also has a great influence on the wrinkle resistance of the fabric. For example, knitted fabrics are fluffier and softer than woven fabrics, and their breathability, wrinkle resistance, and hand feel are very different. The study on the relationship between the structure, tightness and other indicators of cotton woven fabrics and the anti-wrinkle performance shows that under the same tightness and different tissues, the larger the weave coefficient, the thicker the texture, the looser the structure and the larger the swelling of the fabric, due to the large room for movement between the yarns, in the wrinkling process of the fabric, the yarn is easy to move, so the wrinkle recovery angle is large and the wrinkle resistance is good. Under the condition of the same structure and different tightness, the wrinkle resistance of the fabric decreases with the increase of warp and weft tightness. The tightness increases, the friction between the yarns increases, and the crease recovery angle decreases. The correlation between the microstructure coefficient and the wrinkle recovery and tensile breaking strength of the fabric was studied. For the plain weave fabric with the smallest weave coefficient, the fabric has a relatively compact structure and relatively poor wrinkle recovery, while the left twill tissue has a good initial wrinkle recovery.
3. The relationship between fabric structure and warmth and breathability
The study of the relationship between the structure of the fabric and the thermal insulation performance shows that the aperture of the fabric yarn is closely related to the thermal insulation performance. That is, the heating rate difference, thermal conductivity and thermal insulation rate of the heat transfer test indexes under dynamic conditions are linearly related to the average pore size between yarns, and the average pore size between yarns has a parabolic relationship with the temperature dynamic response time, porosity and thermal insulation rate, and fractal dimension and thermal insulation rate.
There is also a necessary relationship between the structure of the fabric and the breathability. The relationship between the air permeability of the plain weave fabric and the fabric coverage coefficient was studied, and it was shown that the relationship between the air pressure difference on both sides of the plain weave fabric and the flow velocity and the fabric coverage coefficient was in line with the unequal hyperbolic relationship.
Fourth, the relationship between the fabric structure and the water repellent performance of the fabric
The fabric structure also has a great influence on the water repellent effect, and the water repellent test results of cotton twill fabric are better than those of plain weave fabric in the study of hydrosol on cotton fabric. The test results of water repellent effect can also find that in the test results of contact angle and water staining level, the cotton twill fabric is higher than that of cotton plain weave. The corresponding results of the rolling angle test also show that the angle of cotton twill fabric is lower than that of cotton plain weave. It is concluded that the fabric structure has a significant effect on the water repellent performance of cotton fabrics, and cotton twill fabrics are more conducive to the improvement of water repellent effect, so as to obtain the difference in water repellent properties of the two fabrics.
From the perspective of fabric structure, the relationship between tissue structure and water repellency was systematically analyzed. In the spraying process, the water flows to the fabric at a certain speed under a certain pressure, and the droplets will break, rebound, and adhere after colliding with the wall during the movement, which depends on the size of the droplets, the incident speed and angle, as well as the roughness of the wall, temperature and other factors. However, according to the spray test process, the time of the water flow, the speed of incidence, the angle, the temperature of the cloth surface and other factors are constant, but the only change is the roughness of the fabric surface. To study this roughness problem, a collision model between droplets and walls was established, and combined with the Eulera Grangian two-phase flow model, the collision of single droplets and water droplets with the wall was numerically simulated.
The relationship between the total volume Vs of the broken droplet and the volume Vd of the incident droplet is given by the following formula:
In the above equation: Ud is the dynamic viscosity coefficient of the droplet, Dd is the diameter of the droplet, Vd is the velocity component of the droplet perpendicular to the wall, the surface tension coefficient of the droplet, and the average height of the rough surface. For different cotton fabrics, the roughness of the fabric surface is different, which will inevitably lead to different Ch, for the larger the surface roughness (the greater R1), the smaller the Ch, resulting in the smaller the total volume of the liquid after the droplet collides with the fabric, that is, the more liquid sticks to the surface of the fabric, and the smaller the water repellent level.