What does a constant temperature suit mean? Seamless forming of imported heating fiber cotton. It is the thinnest constant temperature underwear so far, as thin as cicada's wings and as light as a feather, but it has excellent warmth retention. Super elastic, suitable for making bottoming shirts, warm and practical. After the description of the heating underwear, it was found that its main components are almost the same as those of ordinary thermal underwear, both of which are polyester fiber and nylon, except that there is a fiber material called "Selam" in the self-heating underwear, with a content of 3.2%. "What is Seilam?" The reporter asked. "This is a self-heating material." The salesperson explained that Selam can absorb human sweat, convert it into heat energy, and then store it in the air layer formed between materials and fibers, thus keeping the human body in a constant temperature environment and achieving the effect of keeping warm.
The following are the ingredients of clothes
Jacket nylon (including nano white bamboo charcoal fiber) 53.8% polyester fiber 30.3% cotton 15.9%
Pant nylon (including nano white bamboo charcoal fiber) 6 1.2% polyester fiber 23.4% cotton 12% spandex (elastic fiber) 3.4%
Is the thermostat really constant? The thermostat adopts the principle of self-heating.
Can self-heating underwear really heat itself? In this regard, Gong Yancheng, deputy director of the Youth Committee of China Composite Materials Society, denied it.
Gong Yancheng said that at present, there is no fiber material that can heat itself. This is purely a hype concept and misleading to consumers. "Even if some underwear can really heat up, it is because it uses the technology of returning the heat released by the human body to the human body, not the material itself." Gong Yancheng further explained that taking Selam material claimed by merchants as an example, it contains ultrafine iron, copper and other components, which can store and conduct the heat released by the human body itself, thus achieving the effect of heat preservation, not the material itself. Because most self-heating underwear is thin, Selam stores little heat after people put it on, so the heat conduction is not obvious and the heat preservation effect is not good.
Wang Yi, a dealer who has been engaged in underwear sales for many years, said that the high-tech new products promoted by merchants are "pure exaggeration". The concept of "self-heating" of underwear material originated in Japan, and its main component is chemical fiber or regenerated fiber, which existed many years ago. At present, similar products appearing on the market only have different names, but the essence is the same.
Introduction to the principle of constant temperature clothing
The raw material of heating underwear is a special fiber material, which is expensive. Generally, heating underwear is made of a small amount of heating fibers and other fibers. Therefore, even if it is a real heating underwear, its temperature rise can not be very high, and generally it can actively raise the temperature by 2℃ to 4℃. Relevant experts remind the public to beware of counterfeiting when buying hot underwear. At the same time, it should be noted that even if it is really hot underwear, the increased temperature is limited and cannot be used instead of cotton-padded clothes.
Moisture absorption heating type
The mechanism of fiber moisture absorption and heat generation is that when fiber absorbs water, hydrophilic groups in fiber molecules combine with water molecules, and the kinetic energy of water molecules decreases, and at the same time it is converted into heat energy and released. Usually, the moisture absorption and heating performance has a great relationship with moisture regain. When the moisture regain is high, the moisture absorption and heating performance is good, and when the moisture regain is low, the moisture absorption and heating performance is poor. For example, wool and modal fiber have good moisture absorption and heating effect. Ordinary acrylic fiber and polyester fiber have poor moisture absorption and heating effect.
Solar energy/solar energy
By adding special substances into the fiber to absorb solar energy and convert it into heat energy, it emits far infrared rays with long wavelength, which warms the interior of clothes.
phase change
Heat can be absorbed, stored and released in the form of latent heat by adding heat-sensitive phase change materials to fibers. In the process of temperature change, it can change from solid to liquid, thus achieving the effect of heat absorption and heating.