With the rapid development of textile processing technology and people's functional requirements for fabrics are getting higher and higher, new products are constantly being out. Waterproof and moisture perfume fabric becomes a new high-grade textile, which integrates waterproof, moisture, breathable, windshield, warm in one, this kind of clothing is in the body, which can both rain and wind, and can be dishinched, and it is comfortable. For fiber-woven tight fabrics for moisture absorbing, due to the presence of capillary effects, reduce yarn The wire radius can improve the water seepage resistance of the fabric.
Waterproof and moisture-proof textiles are also called waterproof and breathable fabrics, breathing fabrics, referring to water without immersing the fabric, and the sweat excited by the human body can pass through the fabric in the form of water vapor A functional fabric that is conducted to the outside, integrating waterproof, moistureproof, windproof, warmth and other functions. Woven moisture permeability tester, why do the fabric test moistureter amount, what is the factor affecting the gas permeability of the fabric?
First understand what is the moisture permeability of the fabric; the moisturemous unit g / m2 / 24h is represented, refers to the formation of both sides of the sample under certain standard laboratory conditions. The specific humidity difference, the water vapor passes through the sample to the dry side, by measuring the amount of water vapor transmittance of the sample with time to measure the weight of the moisture wet cup, so as to obtain parameters such as the water vapor transmittance of the sample.
In daily life, there are many factors that are influenced by the waterproof and moisture resistance of textiles. For example, the problems of materials themselves and the process and technical issues of textile processes will play.
So what is the factors affect the waterproof and moisture of the fabric?
Temperature and humidity conditions of fibers
Under the same conditions as the fabric structure, the fibrosis has little effect on fabric fabric resistance, under low wet conditions, water The conveyor is transmitted to the fiber type in the fabric is not obvious. The moisture permeability of the hydrophilic fabric that is hydrophilic in high temperature conditions is significantly better than that of the unsolved polyester fabric.
In fact, under low humidity conditions, since the fiber itself is small, the air diffusion coefficient is lower than the fiber large water vapor vapor, the pore water is lowered. Diffusion, indicating that the relationship between the transfer and fiber species in the fabric is not large. At this time, the thickness and porosity or fabric structure of the fabric is the main factor determining the moisture of the fabric. Fabric itself physics;
When the fibers θ u0026 gt; 90 °, the fibers have waterproof features. When the fabric structure is closer (i.e., the smaller the pores), the better the waterproof effect. Therefore, the fabric is only better discussed when the contact angle of known fibers is discussed. 1. Coatings of the fabric
coated with a layer of impermeable, insoluble in water on the surface of the fabricSince the film layer, the water permeability of the fabric is reduced, and the fabric is therefore not breathable. The entire fabric is required to be uniform and have a certain fastness. The better the coating quality, the better the resistance to infiltration. If waterproof, multi-microporous coating film can be used, a waterproof, water-resistant, water-free, a gas permeable coating fabric can be formed.
2. The size of the coating film aperture. The larger the diameter of the film, the worse the water pressure resistance of the coating fabric.
3. Coating thickness. The coating is too thin, the coating agent is not easy to continuously form a film, the water resistance resistance of the coating fabric is lowered;
thick, the water resistance of the fabric is improved. 4.
Generally, the thicker the thickness of the fabric is, the larger the wet resistance of the fabric. This is because the thicker of the thickness of the fabric, the longer the water vapor is by the pore between the woven.
5. Tourness of the fabric. The increase in the distance between the yarn will directly affect the high water resistance. The closer fabric structure is generally, the better the anti-seepage performance.
6. Curvery of the yarn
When the contact angle θ u0026 lt; 90 °, the fiber assembly material is a waterproof material, structure Close only more capillary hole cores.
8. The size of the contact angle 0. 0 u0026 gt; 90. When the fabric has a water repellent performance, with the increase of 0, the water-resistant value
of the fabric is also increased.
9. Good and weft yarn performance is good. Affected by water pressure, the elastic latitude and weft yarn is easy to elongate, resulting in a formation of adjacent weft yarn gaps, and the water beads are easily seep over, so that the water resistance of the fabric is lowered.
For fiber-woven tight fabrics for moisture absorbing, due to the presence of capillary effects, reduce yarn The wire radius can improve the water seepage resistance of the fabric.7. Fiber surface infiltration