How High-Tech Are The Thermal Underwear?

How high-tech are the thermal underwear? Guangzhou University Spin clothing Chen Luo, a clothing department of the college, told us that in fact, many of the dazzling thermal underwear on the market are replaced by product names instead of the high-tech or novelty fabrics we think.

　　 Underwear fabric Miss Chen Luo, who has long been in contact with all kinds of fabrics in three categories, says that most high-tech functions are just gimmicks. As long as we carefully look at the fabric components on their labels, we can recognize their "civilian" status.

Thermal underwear fabrics can not be separated from three categories. The first category is natural fibers, including cotton, wool, silk and linen, which are commonly seen in the market. Warm underwear It has pure cotton, wool and cashmere material. The second kind of synthetic fiber refers to fabrics made from chemical raw materials such as reed, cotton and wood, such as soybean fiber, modal fiber, bamboo charcoal fiber and so on. The third category is man-made fiber, pure chemical fiber, such as polyester, acrylic, viscose, etc., mostly from the oil extracted from the fiber processing materials made again. According to the stipulate of the national textile industry, there are 28 kinds of chemical fibers used in textile industry. If the names of the labels on the labels are beyond those 28, they may be playing with new terms.

In the interview, Zhang Xun, a regional retail promotion consultant of the international wool Bureau, said: the so-called "warm card" and "thermal card" are acrylic fibers. "Sevilla" is polyester. "Magic card" is elastic spandex. "Lycra" is only a trademark of the DuPont Co's artificial elastic fiber spandex registered product. How to keep warm?

Which of the three kinds of thermal underwear fabrics has the most warm effect? CCTV has done experiments at the China textile industry association testing center. Using three equal amounts of water at 37 degrees Celsius, the body temperature is respectively wrapped in three kinds of thermal underwear and put into the 21 degree thermostat. After half an hour, the temperature changed. The water temperature of the chemical underwear was reduced by 33 degrees Celsius, the natural fiber dropped to 33.6 degrees Celsius, and the artificial fiber modle dropped to 35.2 degrees Celsius.

I used to think clothes The thicker the warmer, the thicker clothes are slower in heat conduction. The above experiments prove that the thicker the thermal underwear is, the more effective it is. Miss Chen Luo explained that it is now necessary to see the thermal conductivity of raw materials. In addition to increasing the thickness, more thermal underwear is made by cutting off the transverse section of fibers so as to make the fibers hollow and keep the static air to reduce the thermal conductivity. These fabrics do not necessarily have thermal energy, but are achieved by reducing the heat exchange between the body itself and the outside world to achieve the effect of thermal insulation, and the air permeability is generally poor. Chen introduced that there are indeed fabrics that can generate heat through physical reactions, such as polyvinyl chloride, but less market products.

According to Professor Chen Luo, the three fabrics have their own advantages and disadvantages. As for the warmth retention property, the underwear of traditional wool and cashmere natural fiber is strong, warm and breathable, but they need hand washing and direct drying. It is more troublesome to take care of them everyday. Synthetic fibers and man-made fibers can be machine washable, and are not easy to wrinkle. They also have environmental protection elements, and the manufacturing cost is relatively cheap. The same is excellent quality products, natural fiber underwear should be less than 300 yuan, more reasonable, chemical fiber underwear in 100-150 yuan is more reasonable.

The so-called high-tech materials in thermal underwear are mostly high-tech fabrics, which mostly change some properties of traditional materials or increase some properties, but actually belong to synthetic fibers or man-made fibers.

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We might as well take a look at the true colors of these warm underwear fabrics on the market.

"Hot underwear": most of the viscose fiber, modal fiber, bamboo charcoal polyester fiber, they are chemical fiber or recycled fiber, mostly from the petroleum processing by-products, these materials have long been discovered, is not a new invention. "Salam": super fine particles of ceramic are added to the chemical fiber acrylic fiber, so that it has the effect of heating. This technology has been used in many new fibers.

Modal fiber: a material with high moisture regain, which can be converted into heat after absorbing water, but wool has the same effect.

The ingredients of "hi tech" fabrics are basically the same. They are basically man-made fibers such as cotton, acrylic, spandex, polyester, etc. In recent years, the underwear of "HEATTECH" series, which is newly sold in UNIQLO and autumn and winter, is actually composed of polyester, acrylic, viscose and spandex. Polyester, also known as polyester fiber, is mainly used for finalization. Acrylic fiber, also called polyacrylonitrile fiber, has a very good performance in terms of wool and elasticity, and its elasticity is 15% higher than that of wool. It is called synthetic wool, but its moisture absorption is almost zero. Spandex is an elastic fiber with high elasticity but poor moisture absorption. Viscose, also called rayon and viscose filament, is very similar to cotton, but its cost is less than half of that of pure cotton. It is smooth, cool, breathable, antistatic and dyed brilliant.

Analysis of new materials for outdoor sportswear fabrics -- high Hygroscopic fiber

With the development of competitive sports, modern sportswear has been widely popularized in the public life through its continuous innovation and development in fabrics, styles and colors. From the perspective of fabric fiber development, its development has gone through the process from natural fiber to chemical fiber, and then to mixed fiber fabric. Subsequently, the scientific community has continuously developed materials that can make the human body produce the greatest comfort, the least sense of exhaustion and weight-bearing. To provide the greatest degree of comfort, scientists have recently developed many kinds of high moisture absorbing fibers.

We know that athletes consume a lot of energy at high speed and are in a state of high heat dissipation. However, when high temperature and humidity cause a lot of sweat and exceed the limits of the body, it will make people uncomfortable, and then affect their level of exercise. Therefore, the requirements for clothing fibers need a higher degree of comfort. Comfort is usually reflected in adsorption, drying, heat and other specific indicators. Because there is a region called "microclimate" between clothing and skin. When the area is at its best, the temperature is not 31 degrees, but 33 degrees. The humidity is not RH 40%, but 60%. And once the above or below this range, especially in high temperature and high humidity environment, exercise will make people feel uncomfortable. Therefore, the relative humidity of "microclimate" is about 100%, which is extremely uncomfortable when the body is in such a temperature and humidity environment. To this end, the development of new hygroscopic fibers aims at effectively improving the "microclimate" of the human body. The following are the characteristics of various high humidity fibers at home and abroad.

High moisture absorbent polyurethane fiber is widely used in gymnastics, aerobics, skills, swimming, track and field and other sports apparel because of its good flexibility. "With the increasing demand of professional sportsmen for clothing comfort, the development of polyurethane fiber technology has been extended from simple stretching function to the development of high functional fiber. Japan's Asahi kasin Technology Co., Ltd. for the first time developed highly absorbent polyurethane fibers, which is characterized by the rapid absorption and decomposition of water quickly, releasing steam and sweat to maintain comfort. Its moisture absorption capacity is almost the same as that of cotton material. If wet cotton reaches 50% of the moisture, it is almost equivalent to 100% of the polyurethane fiber humidifier, and the moisture evaporates quickly. That is to say, in sports or high temperature environment, fiber absorbs moisture from the skin, and it can release humidity quickly under static or low temperature. Such moisture absorption can be repeated. Therefore, this fiber is called "breathing fiber."

The "wicking effect" of fine denier polypropylene fiber makes it a unique fabric. The more detailed detail about the "wicking effect" of polypropylene monofilament fabric is that this effect is more obvious in moisture absorption, sweating and air permeability, and the handle is also more soft. Therefore, the fine denier fabric can sweat and breathe, keep the skin dry when worn, and do not wear cold feeling like cotton fabric when sweating. Of course, there will be no muggy and sweaty feeling like synthetic fiber, thus improving the comfort and health of the fabric. If ultraviolet or antibacterial substances are added to the spinning process, woven fabrics made of such fibers will make idealization of mountaineering, hiking and other outdoor sportswear more ideal.

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The four high dehumidification polyester fiber is produced by the US DuPont Co, four (Tefra-Channel). Polyester It is known that it has excellent wicking ability. It can evaporate and sweat the sweat on the skin by using sweat fabric under the high moisture transmission of the hydrophobic synthetic fiber. Experiments show that after 30min, the moisture removal rate is 52% cotton and four polyester fiber 95%. It can keep skin dry, comfortable and warm and cold proof in sportswear.

Multi section polyester hollow fiber WELLKEY: the purpose of developing this fiber is to use sweat as an object to achieve a thorough drying of sweat. WELLKEY is a polyester hollow fiber. There are many channels on the surface of the fiber to connect the hollow part of the hole, and the moisture can also penetrate from the fiber surface to the hollow part. This fiber structure is aimed at maximum water absorption and moisture content. It has excellent absorption, quick drying and dryness, and is suitable for making sportswear or sports lining.

Dry wet polyester filament: China Gold spinning group's guidance for dry wet development of polyester filament yarn is to increase the gap of single fiber by changing the cross section of fiber. Because of the increase of surface area, the capillary action of water also increases greatly. This fabric has good moisture diffusivity in terms of moisture content. In terms of materials, such as cotton fabric with good moisture absorption capacity, it uses reasonable structure and organization to choose dry, cool and comfortable summer. Sports fabrics To make sportswear. Therefore, the products developed by the company are highly valued by international counterparts.

High moisture absorption and moisture release nylon: the QUUP brand developed and listed in Dongli, Japan is a new type of polymer mixture mixed with a special nylon and high moisture absorbing polymer. This polymer material can also effectively balance the moisture content in a certain high humidity and high temperature environment, and the moisture absorption rate of the polymer material will increase with the increase of water supplement rate, and at the same time maintain the original properties of nylon, and the hygroscopicity will increase by two times. Therefore, the sportswear made of QUUP fiber can also improve the body's low humidity, heat and flu comfort index.

Of course, the new type of moisture absorption developed and developed internationally. Athletic Wear There are many other types of fiber. We believe that with the progress of technology and the development of society, new type of moisture absorbing fiber will be more and more.