What is the difference between moisture absorption and perspiration?

Moisture absorption: synthetic fibers take polyester as an example, in fact, the water absorption is small, the moisture permeability is poor, and it is easy to feel stuffy during activities; natural fibers take cotton as an example, which has good moisture absorption performance and is comfortable to wear, but when people sweat a little. When it is large, the cotton fiber will expand due to moisture absorption and stick to the skin. At the same time, the water distribution speed is also slow, which will cause a cold and wet feeling to the human body.

Therefore, for all fabrics, especially polyester products, treatment with hydrophilic additives in the finishing stage is a good way to improve moisture absorption.

Moisture absorption = perspiration?

of course not! Only when the moisture absorbed in the fabric is discharged to the surface layer of the fabric as much as possible, and the moisture is fully evaporated under the condition of sunlight and good ventilation, this can keep the wearer dry and comfortable.

The moisture removal of fabrics mainly depends on the physical structure of the fibers. The gaseous moisture evaporated from the skin surface is first absorbed by the fabric (i.e., hygroscopic,—note, the fabric, not the fiber!) The capillary effect produced by the voids makes the moisture adsorb and diffuse between the fabrics. In this way, the moisture migrates to the surface of the fabric and evaporates, thus completing the process of dehumidification.

So, just absorbing moisture is not enough. For some ordinary synthetic fiber fabrics, only using hydrophilic additives for post-finishing, and then advertised as moisture-absorbing and "sweat-wicking" actually brought us all into a misunderstanding.

In the production of synthetic fibers, changing the shape of the spinneret orifice produces many grooves in the longitudinal direction of the fiber, which can increase the specific surface area of the fiber. This improves the moisture conductivity of the fibers, wicking sweat through the wicking effect of these grooves. Such as INVISTA's certified polyester for COOLMAX® moisture-wicking fabrics. Its cross section is a unique flat cross, and the fiber surface is longitudinally formed into four grooves. Its specific surface area is 20% larger than that of conventional round, so the perspiration performance is higher than that of conventional polyester.

Special attention should be paid to: the fiber in the garment has been greatly damaged (plastic deformation) due to processing, so the perspiration effect is greatly reduced, while INVISTA's new "CCO O" polyester can be used in larger This plastic deformation can be alleviated to a certain extent, so that the perspiration function can be maximized - the C-shaped guide groove is not easy to deform. In addition, for consumers, the function of the yarn is important, but it is really important to ensure the functionality of the clothing. More important is the quality and function of the fabric.