The Warmth Of Underwear Is Really Amazing.

According to the world clothing shoes and hats net, the northern winter has arrived. At the moment, single shirts and trousers are no longer able to resist the chill wind. The three layers of three layers of outside bears are not fit for the aesthetic pursuit of the current urban people.

So the "hot underwear" was born and hit many people's "key" and was also labeled as "wintering artifact" by businessmen.

Since then, a garment seems to be "beautiful and not frozen".

However, at the same time, the voice of questioning and questioning followed.

Can the underwear be heated? Is it true that the heat preservation effect is so magical?

With the temperature decreasing, sales of thermal underwear are rising.

Reporter in

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1, shop and other electronic business platform with "hot underwear" as keywords search, product information up to dozens of pages, or even hundreds of pages.

The sales volume of a hot underwear on Taobao is up to more than 56000.

Online, UNIQLO's HEATTECH series underwear will always be sold out because of hot sales.

There are many brands and styles of these hot underwear.

Reporters found that many brands of hot underwear, the main signs of its tag are polyester fiber (polyester), viscose fiber, modal fiber, acrylic fiber, spandex, nylon, etc., in addition, some brands of underwear also marked special materials used in the tag, such as "far-infrared fiber", "Salam", "Outlast" and so on, some awkward "high-tech" terms are dazzling.

Most of the hot underwear businesses claim that they have a "hi tech" material in their underwear, which can heat themselves, and the thermal effect is several times that of traditional cotton thermal underwear.

However, in the view of Zhang Tianjiao, an associate professor of Beijing Institute Of Fashion Technology, the concept of "self heating" claimed by businessmen is totally out of line with scientific knowledge.

"The concept of self heating is not consistent with the law of conservation of energy. It is necessary to have energy sources."

Zhang Tianjiao said.

It is understood that the concept of fever underwear originated from Japan.

Around 2000, Japan launched a special fiber material that absorbs heat from the body's water.

This material was first used by mountaineers and later extended to ordinary consumption.

In fact, heating underwear is not a "high-tech".

Because no matter what kind of material can heat through moisture absorption.

The mechanism of fiber absorption and heating is that when the fiber absorbs moisture, the hydrophilic groups in the fiber molecules combine with the water molecules, and the kinetic energy of the water molecules decreases, and at the same time, the heat is released to heat.

Usually, the moisture absorption and heating properties are greatly related to the moisture regain of the fibers. The moisture regain of the fibers is high, and the moisture absorption and heating performance are good. The moisture regain rate is small, and the moisture absorption and heating performance is poor. For example, wool and modal fiber have good moisture absorption and heating effect, while the ordinary acrylic and polyester fibers have poor moisture absorption and heating effect.

The far infrared fiber heating mode is first endothermic and then exothermic.

Zhang Tianjiao said that it absorbs two kinds of energy: one is the energy in the environment, such as visible light, infrared ray, far-infrared ray, and so on. Another kind of energy is the heat of the environment and the heat of the body itself.

The far-infrared fiber absorbs these energies and then converts them into far-infrared rays, which are then radiated to the human body to achieve heat supply to the human body.

"Salam" is a far-infrared radiation acrylic fiber, which is made from advanced far-infrared technology by adding far-infrared ceramic particles into acrylic fibers.

Zhang Tianjiao said that unlike the far infrared fiber's heating principle, "phase change materials such as Outlast materials, when the external environment temperature changes, these materials will undergo phase pformation, just like ice melts into water, and water condenses into ice."

When the ambient temperature rises, it absorbs heat just as ice melts into water. If the ambient temperature drops, it will solidify, equivalent to water condensing into ice, and it will heat up again.

So this is a two-way thermostat material.

But Hu Guoliang, Professor of materials and textile school at Zhejiang Sci-Tech University, pointed out that the conditions required for phase pition are relatively harsh, and the phase pition range is relatively narrow. Only in the corresponding temperature range, such as cold to a certain extent or heat to a certain extent, phase change material can play a role.

Although the hot underwear is known as "wintering artifact" by businessmen, but Mr. Sun said in an interview with the media, he heard his friend introduce this kind of underwear to be self heating and felt quite fresh, so he bought a set of 450 yuan.

But after wearing, it feels no different from other thermal underwear, and does not feel that it can emit heat itself, and it is not as good as ordinary warm underwear.

"The difference between the heat underwear and the ordinary underwear is not too great. Actually, there are some additives in the interior, because the fabric itself must be a general textile fiber fabric, and the fiber is very thin. Too many functional materials are easily broken, so the amount added is very small.

Because the amount of added is small, so the effect will not be particularly obvious.

Zhang Tianjiao said.

Hu Guoliang also doesn't care about the warmth of underwear.

"At present, the common underwear in the market is basically the use of the heat released by the body itself, and then it is returned to the human body, so as to achieve the effect of keeping warm.

He said.

Zhang Tianjiao said that although the price of far-infrared fiber materials is not expensive, adding it to fiber is more difficult, which improves the cost of heating underwear. Outlast material as a phase change material is more expensive, because it needs to be encapsulated in microcapsules for reuse. At present, this material is not widely applied, the fundamental reason is that its effect is not very significant.

It is understood that if a large number of heating fiber materials are added, the price of underwear will become quite expensive.

For example, the US space agency used a lot of Outlast fibers for the astronauts' moon landing costumes, and the cheap underwear sold on the market actually contained very few fibers.

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