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Analytical testing mechanism of textile moisture, perspiration, dry

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Analytical testing mechanism of textile moisture, perspiration, dry

Release date:2017-01-13 Author:科润生物 Click:

 

     

To solve the moisture perspiration fabric first need to understand the fabric of moisture absorption and perspiration. Moisture absorption and water absorption are the two concepts that need to be explained. The hygroscopicity is the ability of the fabric to absorb the gaseous water. Moisture absorption of the fiber is not easy to produce static electricity, not only conducive to textile processing, but also comfortable to wear. Water absorption refers to the ability of the fabric to absorb the liquid water, that is, the liquid water in the fiber surface wetting, by the fiber in the pores, cavities and fibers formed by the capillary absorption, maintain. The water absorption of fiber is not only related to the chemical structure of the fiber, but also to the physical structure and supramolecular structure of the fiber. For the hydrophobic fibers, the physical structure of the fiber and the supramolecular structure of the fiber macromolecules are more important to the water absorption.

Usually, in the crystalline region of fiber macromolecules or high order zone, water molecules diffused or infiltrated, while in the amorphous region or lower area and morphological structure, rough area and microporous pore or more of the gap between the water molecules diffusion, and easy to be maintained, showed good hydrophilic. In order to avoid the burden of the narrative, in addition to the necessary circumstances, the following are "hygroscopic".

There will be sweating phenomenon under the condition of wearing and human labor in the process of movement, the sweat fabric is conducted to the outside space of the process can be described as two forms: 1) liquid sweat in direct contact with the fabric, in the form of liquid water and inner surface of the wet fabric and absorption of the fabric and rely on the gap the formation of yarn or fibers between the capillary is transported to the outside of the fabric surface, and then evaporated into water vapor diffusion to the outer space; 2) by human sweat evaporation of water vapor is absorbed directly form the fiber surface of the fabric, and the fabric surface to condense into liquid water, again with the same transmission mechanism to the outer surface of the fabric evaporated into water vapor, migrate to the outer space.

Therefore, sweat and sweat releasing process, consists of a wet moisture diffusion evaporation steps.

1 wetting process

The wetting water on the surface of the fiber and fabric, is the first step of moisture absorption, perspiration, dry quickly, for lack of synthetic fiber polar hydrophilic group, and complete the overall process control procedures. The wetting process is mainly controlled by the thermodynamic condition, that is, the wetting ability of water to the fiber material. From the point of view of chemical structure, such as to form a fabric or fabric fiber when introducing hydrophilic groups is the best option; considering the physical structure, if trying to make the surface of the fiber, fiber cross-section and fine denier fiber, namely more water and fiber contact surface area, will be beneficial to wetting process.

2 moisture (or water absorption) process

Refers to the process by which moisture is applied to the surface and interior of fibers and fabrics after wetting of fibers and fabrics. The chemical structure of the hydrophilic fiber increased, the fiber surface roughness, cross-section and fine denier of specific surface area measures are undoubtedly useful in this process.

3 diffusion process

Refers to the fabric moisture absorbed by the inner surface of the outer surface of the fabric and the fabric moisture diffusion area gradually expanding process, mainly rely on fiber cavity and single fiber in the single fiber yarn in the hole, between the gap and the gap between fabric yarn formed by capillary action. Therefore, the fiber cross-section of fiber, fine denier and fabric density, are effective to improve the conduction effect.

4 evaporation process

Refers to the absorption of moisture from the fabric to the outer layer of the evaporation of the fabric to achieve the rapid drying process. Too many hydrophilic macromolecular chemical structure in the presence of fiber (such as cotton fiber, viscose fiber, etc.) is not conducive to the realization of quick drying, whereas in the physical structure, all can lead to increased evaporation of surface area measures are conducive to quick drying; therefore the diffusion process to create the necessary conditions for the rapid the evaporation of water, and the fabric outside environment temperature, humidity and air velocity have an important influence on the evaporation process.

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