In the cold winter, people who love beauty always do not want to be constrained by three layers of clothes inside and outside. At this time, “self-heating underwear”, which is claimed by merchants as a “winter artifact”, is favored by many consumers. What’s so magical about heating underwear? Can it heat itself? What are the clothing fabrics that we often come into contact with in life? Let’s find out.
Do heating underwear really heat?
On the shopping e-commerce platform, search with keywords such as “self-heating thermal underwear” and “self-heating underwear”. There are many brands and the sales volume is often more than 10,000. These “heating underwear” are made of a variety of materials. As can be seen from the clothing tags, the main ingredients are polyester fiber, viscose fiber, modal fiber, spandex, nylon, etc. The introductions of some brands also specifically indicate that they have added special materials, such as “hygroscopic and heating new German fiber”, “warm black technology German velvet heating fiber”, “Lycra fiber”, etc.
Do the materials in these underwear really radiate heat? Industry insiders said that so-called “heat-generating fibers” cannot generate heat, but merchants have “over-functionalized” these things. Some fibers are breathable and some are just not breathable. The non-breathable ones are good at keeping warm, but the breathable ones are not. In normal life, if it’s cold, wear more clothes to reduce breathability; if it’s hot, wear less clothes to increase breathability. The principle is that simple. Because no matter what kind of material it is, it can generate heat by absorbing moisture. The mechanism of fiber moisture absorption and heating is that when the fiber absorbs moisture, the hydrophilic groups in the fiber molecules combine with water molecules, and the kinetic energy of the water molecules is reduced, and at the same time it is converted into heat energy and released. . In the final analysis, this is more or less thermal insulation effect, not whether the fiber itself can generate heat.
In life, in addition to our common pure cotton clothing, there are many materials used to make clothing. For example, the coral velvet we commonly use in winter is a fabric made of polyester fiber. Its fiber density is high, coral-shaped, has good coverage, is light, soft and colorful, so it is named coral velvet. Coral velvet does not pill or fade, its water absorption performance is three times that of cotton products, and its texture is fine. In recent years, a large number of coral velvet household products have appeared on the market, such as coral velvet pajamas, blankets, quilt covers, etc.
The disadvantage of coral velvet is that it is prone to static electricity and will shed slightly. It is recommended to wash it before wearing it (skin is dry in winter, you can apply moisturizer before wearing it, or use softener when washing), because it will It sheds a little loose hair. It is recommended that people with sensitive skin and asthma should avoid wearing or using coral fleece.
You may find that some fluffy clothes in winter are called polar fleece clothing by merchants. Polar fleece, also known as fleece, is a type of knitted fabric. The woven gray fabric is first dyed and then processed through various complex processes such as napping, carding, shearing, and polar fleece. The polar fleece fabric is fluffy and elastic. The front side has fluffy and dense fleece and is not prone to lint and pilling. The back side has sparse and uniform fleece and short fluff. The main component of polar fleece is polyester fiber. The fabric is soft and light, and can still keep out the cold when it gets wet. Under the same conditions, the warmth retention is four times that of cotton. Wearing lightweight fleece clothing, which is easy to move and not prone to sweating, can keep the fabric dry well and thus better maintain body temperature.
Corduroy is a cotton fabric with cut and raised piles and longitudinal velvet strips formed on the surface. Because the velvet strips resemble rush wicks, they are called corduroy. Its raw materials are generally mainly cotton, and may also be blended or interwoven with polyester, acrylic, spandex and other fibers. Corduroy has a thick texture and good warmth retention, and is suitable for making autumn and winter outerwear, shoe and hat fabrics, curtains, curtains, sofa fabrics and other decorative items. Corduroy fabric feels elastic and soft, with clear and round velvet strips, soft and even luster, thick and wear-resistant, but it is easy to tear, especially the tearing strength along the velvet strip direction is low. During the wearing process of corduroy fabric, the velvet part is in contact with the outside world, especially the elbows, collars, cuffs, knees and other parts of the clothing are subject to external friction for a long time, and the velvet is easy to fall off.
Polyester fiber can be found in many clothes. Polyester fiber is a synthetic fiber obtained by spinning polyester formed by the polycondensation of organic dibasic acid and glycol. It has many excellent textile properties and is widely used. It can be made purely as a textile or blended with natural fibers such as cotton, wool, silk, hemp and other chemical fibers to make it into a variety of colors, strong and crisp, easy to wash and dry, and free of charge. After ironing, you can wear wool-like, cotton-like, silk-like and linen-like fabrics with good performance.
Suitable for men’s and women’s shirts, outerwear, children’s clothing, upholstery fabrics and carpets, etc. Polyester fiber has high strength and elastic recovery capabilities, so it is durable, wrinkle-resistant and requires no ironing. Its light fastness is better than that of acrylic fiber, but its light fastness is better than that of natural fiber fabrics, especially its light fastness behind glass is very good. In addition, polyester fabrics have good resistance to various chemicals and are not greatly damaged by acids and alkalis. At the same time, they are not afraid of mold or insects. However, polyester fiber has poor hygroscopicity, is not strong in water absorption, and is easily�Adsorbs dust; has poor breathability.
Bamboo fiber is a cellulose fiber extracted from naturally growing bamboo. Bamboo raw fiber has good air permeability, instant water absorption, strong abrasion resistance and good dyeability. It has natural antibacterial, antibacterial, mite removal, deodorant and anti-ultraviolet functions.
Natural bamboo fiber is mainly bamboo fiber. Bamboo raw fiber is a natural bamboo fiber produced by a combination of physical and chemical methods. Bamboo fiber can be used for clothing fabrics, mats, sheets, curtains, scarves, underwear, socks, and can be used to make medical care supplies, etc. It can also be used to make curtains, jackets, casual wear, suits, shirts, towels, bath towels, etc. It is used in the manufacture of paper towels. In recent years, bamboo fiber natural paper towels using bamboo fiber as raw material have become popular among consumers.
Among all natural fibers, bamboo fiber has the best moisture absorption and breathability. Bamboo fiber products are fluffy and light, smooth and delicate, soft and light, as soft as cotton, as smooth as silk, soft and close to the skin, skin-friendly, with good drape, giving people a zero-pressure comfort. Different processes are used according to the needs of different seasons. When using bamboo fiber products in summer, the human body will feel extremely cool. When used in winter and spring, it is fluffy and warm, and can remove excess heat and moisture from the body without getting angry or dry. Bamboo fiber products also have natural antibacterial, antibacterial, and sterilizing effects, because bamboo contains a unique substance, which is named “bamboo quinone”, which has natural antibacterial, anti-mite, anti-odor, and anti-insect functions.
In addition, the transmittance of ultraviolet light depends on many factors, such as tissue structure, coverage coefficient, color, chemical additives in processing and sample handling, etc. For 200-400nm ultraviolet rays, the penetration rate of bamboo fiber is less than 0.6%, which has good anti-ultraviolet effect.
Lyocell fiber is made from renewable softwood fiber as raw material to prepare cellulose pulp, and then passes through the organic solvent N-methylmorpholine-N-oxide (NMMO) dissolved, wet-spun regenerated cellulose fibers. Waste can be naturally degraded, and 99.5% of the amine oxide solvent used in the production process can be recycled and reused. It is not easy to pollute the environment and is a green and environmentally friendly fiber.
Lyocell fiber has the characteristics of softness, breathability, smoothness and coolness, durability and durability. Its products have good wearing properties and can be spun purely or combined with cotton, linen, silk, wool, synthetic fibers and viscose. Fiber blending to improve the properties of other fibers. The fabric woven from its yarn is shiny, soft and smooth, has a natural feel, excellent drape, good breathability and wearing comfort. Different styles of pure Lyocell fabrics and blended fabrics can be woven through different textile and knitting processes, which are used for high-end jeans, women’s underwear, fashion and men’s high-end shirts, casual wear and casual wear.
Cupramine fiber and lyocell fiber are both regenerated cellulose fibers, but the production processes are different. Named after it is treated with ammonia and copper hydroxide during the manufacturing process, it is a regenerated cellulose fiber named after the solvent. Cupro ammonia fiber has the characteristics of refreshing, antistatic, breathable, and good drape. It can avoid discomfort such as stuffiness and is very suitable for use as a high-end lining material. At present, cupro fiber has been pushed from lining to fabrics, and is also widely used in some knitted products. It can be seen in jackets, suits, shirts, underwear and other products.