Hydration perspiration fiber development background
In recent years, people have become increasingly demanding about the comfort, health, safety, and environmental protection of apparel fabrics. With the increase in people's outdoor activities, the tendency for casual wear and sportswear to penetrate and integrate with each other is also increasing. More and more popular among consumers, the fabrics of such garments require both good comfort and comfort. In the event of sweating, garments do not stick to the skin and produce a cold and damp sensation.
As a result, new requirements for the moisture absorption and perspiration function have been proposed for the fibers of the fabric.
It is well-known that cotton is taken as an example of natural fiber, and its moisture absorption performance is good, and it is comfortable to wear. However, when the amount of sweating of a person is slightly larger, the cotton fiber expands due to moisture absorption, its luck is reduced and it sticks to the skin, and at the same time, the water diverges. The speed is also slower, thus giving the human body a sense of coldness and dampness. The polyester fiber, for example, has low water absorbency and poor moisture permeability due to its static electricity accumulation and can easily cause entanglement problems during wear, especially during activities. Prone to hot feeling.
Synthetic fibers have long played an important role in satisfying society’s growing clothing. Among them, mainly polyesters have been used. Since the industrialization of polyesters, research on polyester modification has been continuously carried out. Of course, increasing the absorption and moisture permeability of terylenes is the production of terylenes in various countries. And research and development departments are most concerned about R & D direction.
In the domestic textile market in recent years, the demand for moisture-absorbing and sweat-reducing textiles has gradually increased, which has attracted the attention of people in the industry.
Moisture absorption and drainage properties of moisture-wicking fibers
The moisture wicking properties of fibers depend on their chemical composition and physical structure morphology. Gaseous moisture evaporating from the surface of the skin is first absorbed by the fibrous material (ie, absorbed) and then released through the surface of the material; while the liquid moisture on the skin surface is formed by pores (capillaries, micropores, grooves) inside the fiber and between the fibers. The capillary effect produced by the voids causes moisture to adsorb, diffuse, and evaporate (ie, release moisture) across the surface of the material. The effect of both effects leads to the migration of water. The former effect is mainly related to the chemical composition of the macromolecules, and the latter effect is related to the physical structure of the fibers.
Moisture absorption and perspiration fibers generally have a high specific surface area, and the surface has a large number of holes or grooves. The cross section is generally a special shape. The use of the capillary effect enables the fiber to rapidly absorb the moisture and sweat on the skin surface, through diffusion, Passed to the outer belt.
Absorbency of fiber
Moisture absorbing and wicking fiber has the characteristics of water absorption. It is the surface of the fiber that has many microporous or fibril gaps and surface grooves communicated between the inside and outside, which makes it easy for moisture to enter the fiber. At the same time, many tubular grooves along the fiber axis or The capillary tube provides a channel for moisture migration, so the fiber has good water absorption. After water absorption, the phenomenon of swelling due to absorption of water does not occur.
Dryness of fiber
The moisture between polyesters is mainly held by the fibers by a large amount of microporous capillary attraction, or mechanically held in the interfiber capillary. At normal ambient temperatures moisture is easily transported to the surface of the fiber and evaporates.
Hygroscopic Perspiration Polyester Production Method
Because polyester is a highly crystalline fiber. There is no hydrophilic group in the main chain, so it is hydrophobic and has poor moisture absorption and perspiration. Therefore, the clothes are poor in moisture permeability and have a sultry feeling. Another kind of trouble caused by static electricity is easy to accumulate. Throughout the development of moisture wicking polyester. Mainly through physical and chemical modification, or a combination of both.
Special shaped fiber
Changing the shape of the spinneret hole is a simple, intuitive and effective way to increase the moisture permeability of the fiber. Many grooves are generated mainly in the longitudinal direction of the profiled fiber. The wicking effect of fibers through these grooves serves to absorb moisture. "Coolmax" polyester produced by DuPont. Its cross-section is a unique cross-shaped, longitudinal fiber surface into four slots. The second area is 20% larger than the conventional circular section, so the wicking performance is higher than that of conventional polyester.
Polymeric styrene oligomer blends or composite spinning
The hydrophilic-group-containing polymer and the polyester chips are blended and spun while the moisture-wicking fibers are produced using specially designed shaped spinnerets.
The polyester slice and the hydrophilic polymer are compounded with a spinning core to distort the moisture wicking fiber. The hydrophilic polymer is usually the core layer of the composite fiber, while polyester is the skin layer. Hydrophilic polymers are generally polyether modified polyesters and hydrophilic modified polyamides. The two components play a role of moisture absorption and moisture conduction, respectively, and the composite fiber has the functions of moisture absorption and moisture conduction and achieves the effect of moisture absorption and perspiration.
Through the graft copolymerization method, hydrophilic genes are introduced into the macromolecular structure to increase the moisture absorption and perspiration function of the fiber. Usually attract carboxyl, amide, hydroxyl and amino, and increase the affinity for water. At the same time as raw material modification, proper spinning process is also needed to make the fiber porous and have a larger specific surface area.
Ekslive, a breathable polyester fabric developed by Japan Toyo, is a hygroscopic wicking function obtained by blending polyacrylate powder (known as mystery powder) with polyester, and removing heat by moisture absorption to improve the saturated water absorbency of polyester fabrics. It is said that in 2002 sales of 2 billion yen was about 4 million meters, 60% of the products were woven fabrics, and 35% were knitted fabrics. Komatsu Serien, on the other hand, grafted silk compounds onto polyester fibers to produce absorbent polyester.
From the current industrialization of moisture-wicking polyester, it seems that the main method is to use physical methods to spin the three special-shaped fibers of “+”, “Y”, and “T”, and there are also fine grooves in the surface in order to enhance the strength. Perspiration wicking function.
Fiber's general specifications and fabric properties
Moisture wicking fiber is mainly used to make fiber cross-section profile (Y-shaped, cross-shaped, W-shaped and bone-shaped, etc.) to form a groove on the surface of the fiber. With the wicking and guiding wet structure of the groove, the skin moisture and sweat can be quickly absorbed. , And instantly excreted, and then spread by the fabric of the table fiber sweat and quickly evaporated, so as to achieve moisture wicking, regulate body temperature purposes, so that the skin remains dry and cool.
At present, the most widely used and most effective ones are the moisture wicking fibers produced by cross-section production. Such as: DuPont's Coolmax fiber, Taiwan Far East Textile Topcool fiber, Taiwan's Zhongxing Textile Coolplus fiber.
Moisture wicking common specifications are: fiber: 1.4D * 38mm, filament type: 50D/72F, 100D/144F, 150D/144F, 75D/72F, 75D/48F, 75D/36F, 100D/72F, 100D/48F, 150D/96F, 150D/48F, etc.; Yarn category: 16S/1, 20S/1, 30S/1, 32S, 40S, 50S, 60S, etc. In addition, the moisture-wicking fiber and cotton, hemp, Tencel and other raw materials blended yarns are also emerging.
Moisture wicking fiber woven fabrics are widely used in sportswear, outdoor, tourism and casual wear, underwear and other fields due to their excellent properties such as light weight, moisture permeability, quick-drying, cool, comfortable, easy to clean, and ironing-free. Well received by consumers. In the market, from woven to knitted, from fiber to yarn, from fabrics to garments, home textiles, moisture-wicking fiber products are everywhere, and a complete moisture-wicking fiber industrial chain has been formed.
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