Hygroscopicity of fibers

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Hygroscopicity: Textile fibers are placed in the air and will continue to exchange water vapor with the air. That is, textile fibers continuously absorb water vapor in the air while continuously releasing moisture into the air. The property of absorbing or releasing moisture in textile fibers is called the hygroscopicity of fibers.

Hygroscopicity of textile fibers is one of the important physical properties of textile fibers. The degree of moisture absorption of the textile fiber has a certain influence on the size, weight, and physical and mechanical properties of the textile fiber, which also affects its processing and use properties. The size of the absorbent capacity of the textile fiber also directly affects the wearing comfort of the fabric. Fibers with high moisture absorption capacity can easily absorb sweat discharged from the body, regulate body temperature, relieve sensation of dampness, and make people feel comfortable. Therefore, attention must be paid to the hygroscopic properties of fibers in commercial trade, fiber performance testing, textile processing, and textile selection.

In common textile fibers, wool, hemp, viscose, silk, cotton, etc., have relatively strong hygroscopicity, and the hygroscopic ability of synthetic fibers is generally poor. Among them, vinylon and nylon have slightly better hygroscopicity, acrylics are worse, and polyesters are worse. Polypropylene and Polychlorin are almost non-hygroscopic.

At present, synthetic fibers with poor hygroscopic ability are often blended with natural fibers or viscose fibers having strong hygroscopicity to improve the moisture absorption ability of the fabric.

In the hygroscopic properties of the fibers, in addition to hygroscopicity, the water absorbency of the fibrous material is also closely related to the wearing comfort of the taking fabric. The water absorbency of a fiber refers to the property of the fiber to absorb liquid water. The water vapor and sweat that people produce when they are active mainly lead the moisture absorption and water absorption properties of the materials, absorb and diffuse outwards, thus making people feel comfortable. In general, the outerwear is mainly wetted by rainwater, so the fiber with low water absorbency can be selected as the outerwear material; the underwear is mainly affected by the involuntary evaporation and perspiration of the body, so the absorbent and absorbent properties should be selected. Fiber for underwear materials.



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