Unidirectional moisture conduction is that the inner layer of the fabric contacting the body can quickly discharge the sweat to the outer layer of the fabric, while the outer layer of the fabric can quickly evaporate the sweat.
Two conditions required for unidirectional moisture conduction:
- The inner layer of the fabric has good capillary effect;
- The outer layer of the fabric has a good diffusion effect on moisture.
Unidirectional moisture conduction function of fabric
The unidirectional moisture conduction function of the fabric is developed on the basis of moisture conduction and quick drying, which means that the moisture and heat are quickly transferred from the inner layer of the fabric (skin contact layer) to the outer layer of the fabric (air contact layer) and evaporated for quick drying, and the moisture and heat do not stay in the inner layer. This kind of fabric does not stick to the skin and is very comfortable to wear. It is the first choice of sports fabrics.
Method for achieving unidirectional moisture conduction effect
Raw material
Because various raw materials have different moisture absorption and moisture conductivity, if the raw materials with good moisture conductivity are selected as the inside and the raw materials with poor moisture conductivity as the outside, the sweat is easy to pass from the inside to the outside and evaporate rapidly. The moisture absorption of the inner raw materials cannot be too good, otherwise the sweat cannot be fully discharged.
The same raw material can also change its moisture absorption and moisture conductivity through spinning or other finishing processing. For example, strong twist yarn can significantly improve its moisture conductivity. In addition, the yarn can also be treated with hydrophilic finishing or water repellent finishing before weaving, so as to change its properties. The finer the fiber or the more complex the cross-section shape of the fiber, the more grooves and micropores on the surface, that is, the greater the degree of abnormity of the fiber, the more capillary tubes formed, and the stronger the moisture conductivity of the fabric.
Based on the principle of capillary differential effect of special-shaped chemical fiber raw materials, sweat is transferred from the inner side with weak moisture conductivity to the outer side with relatively strong moisture conductivity, and evaporated and dried quickly on the outer side.
Using polypropylene fiber
Polypropylene yarn and polyester are interwoven to make water or sweat enter the polyester surface from the polypropylene surface, but will not enter the polypropylene surface from the polyester surface, which can achieve the effect of unidirectional moisture conduction. This design has the following advantages:
(1) Using the water repellent effect of polypropylene fiber, sweat can be quickly transmitted to the outside of the body to keep the body surface dry and comfortable.
(2) Combined with the quick drying characteristics of polyester, the sweat transmitted from the skin volatilizes as soon as possible to maintain the beauty of clothing.
PS: polypropylene fiber, also known as “breathing fiber”, has the advantages of low density, light weight, hydrophobicity, fast drying, antifouling, deodorization, wear resistance, environmental protection, good chemical stability and so on.
Finishing
After finishing, the thermal resistance and moisture resistance of one side of the fabric are reduced, so that the heat and moisture transfer of this side is enhanced, which is conducive to perspiration and moisture conduction. For example, printing is used to finish one side of the fabric, so that the oil and water repellent finishing agent is evenly distributed on one side of the fabric, and the penetration depth of the finishing agent on the fabric is controlled, so that one side of the fabric is hydrophilic and one side is hydrophobic, forming a hydrophilic and hydrophobic bilateral structure. Because the moisture conductivity of the hydrophobic surface is stronger than that of the hydrophilic side, sweat is directed from the hydrophobic side to the hydrophilic side, and can quickly diffuse and evaporate, so as to keep the inner layer of the fabric relatively dry.
