Why do self-heating fabrics heat up? What is the principle? Is self-heating fabric easy to wear?
Why do self-heating fabrics heat up? What is the principle? Is self-heating fabric easy to wear? Does it use some chemicals to achieve the self-heating effect? Will it have an impact on the human body? This kind of fabric generally achieves the purpose of “self-heating” through two technologies. One is by adding inorganic ions that are better at absorbing thermal radiation into the fiber. The more famous fiber is Toyobo’s selam is made by adding far-infrared ray-emitting ceramics to the spinning solution.
But in fact, this kind of fabric does not actively heat itself, but absorbs the heat released by the human body, stores it and then releases it. And if the underwear made of this kind of fabric is too thin, the effect will not be very obvious, that is, it can increase by one or two degrees.
The other is to use the hydrophilic groups in the polymer molecules in the fiber to combine with water molecules. The kinetic energy of the water molecules is reduced, and at the same time it is converted into heat energy and released. . A well-known price comparison is UNIQLO’s self-heating underwear. According to official propaganda, this underwear can heat up by 4.5 degrees at 90% humidity. However, the humidity that the human body is comfortable with is far from that high at 45%-65%, especially in the dry north. This temperature in the environment is “better than nothing”.
The fibers produced by these two methods are relatively safe and will not cause any harm to the body, but its self-heating function is not as magical as advertised. It is said that wearing an extra piece of self-heating underwear is the “icing on the cake”, and it is unrealistic to rely on it to “provide help in times of need.” In the cold winter, thick thermal clothing and a down jacket are more reliable. Of course, adding self-heating will be a little better.
Keywords:
self heating fabric
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