The Fire Test Of The Heated Underwear Proved That It Was Thin And Not Warm.

Recently, some manufacturers have launched "self heating" thermal underwear for sale in the market. This "thin warm underwear" claims that the fabric can be "self heating" and is much thinner than the bulky ordinary thermal underwear, attracting many consumers' eyeballs. However, some readers have given a hotline to the column of our life lab, doubting the effect of "self heating" of underwear. "Self heating" underwear is a high-tech or a gimmick. Yesterday, the reporter conducted a group of experiments, and found that the so-called "self heating" underwear does not actually enhance the temperature of the object. Because of its thickness is thin, and so on, these "thin warm" underwear's thermal performance is not like ordinary cotton underwear.

investigation

"Self heating" underwear sells well

Reporter survey found that whether it is large shopping malls or online shop, affixed with "self heating", "salad" and other labels. Thermal Underwear The best seller. In a famous brand shop, the monthly sales volume of a woman's thermal insulation underwear reached more than 20 thousand. These "self heating" thermal underwear claims that they have two advantages over ordinary thermal underwear: one is "warm", the other is "thin". The so-called "thin warm".

Customer service of a Taobao shop recommended a thin underwear for the reporters. "This is high-tech, the main ingredient is heating fiber, do not look thin, put on it is light and warm." But for its heating principle, sales customer service is very vague, but it will feel warmer than ordinary underwear. In this underwear description, the "fever" function is so explained: "the fiber itself will absorb the water vapor emitted by the body, and convert it to heat, so that the material itself warming." Besides, this underwear also has the functions of thermal insulation, moisture retention and antistatic.

Mr. Wang bought a set of thermal underwear from the Internet. "It is really thin, very light, and the fabric is very comfortable. It seems that it will really glow." But as soon as we catch up with the wind, this underwear has no effect. Speaking of his own experience, Mr. Wang said. However, he said that the fabric of this underwear is all made of chemical fibers and does not contain cotton ingredients.

Experiment

Wrap hot water to cool down

So, is "self heating" underwear really hot? "Self heating" underwear and ordinary underwear which is more warm? The reporter conducted a group of experiments.

Reporters found three different kinds of underwear, including the popular "self heating" underwear this year. Cotton underwear And thickened underwear with velvet. These three kinds of underwear are three famous brands. After measurement, the reporter found that "self heating" underwear single layer thickness is about 0.5 millimeters, pure cotton underwear is about 1 millimeters, and velvet thickened underwear is about 1.5 millimeters. The three underwear feels soft and comfortable.

The reporter then prepared four beaker models of the same type. During the experiment, the reporter poured 60 ml of hot boiled water into the beaker, and then cooled it to 57 degrees. Then three of the beaker were stuffed into the sleeves of the three kinds of underwear for about 15 centimeters. The fourth beaker did not wrap anything. Under the same conditions, the four beaker were placed on the wooden floor together. At this time, the indoor temperature is 26 degrees.

20 minutes later, the reporters measured the water in the beaker wrapped in the sleeves respectively. The metal temperature detector is used in the measurement, and the minimum calibration is 0.1 C. After measuring, the reporter saw that there was no water in the beaker placed in the sleeves, the temperature dropped to 36.3 degrees, the water temperature in the "self heating" underwear dropped to 40.7 degrees Celsius, the water temperature of the pure cotton underwear dropped to 42.5 degrees, and the water temperature in the underwear thickened was 42.2 degrees Celsius.

conclusion

No underwear was found to be self heating.

It can be seen that these three "self heating" underwear, pure cotton underwear and flannel thickened underwear have played a role of thermal insulation in the experiment. But in contrast, "self heating" underwear has no "fever", and its thermal effect is no better than ordinary cotton underwear and velvet thickened underwear.

expert

"Fever" is not heated, "thin and warm" is difficult.

An industry insider said that the "warmth" effect of thermal underwear is actually insulation. Velvet underwear and cotton underwear rely on thickness and warmth. The thicker the material is, the better the warmth retention effect is. Because of the large gap of fiber, the air layer in the clothing has thermal insulation effect, thereby preventing heat loss. The so-called "self heating" underwear, its principle is mainly to use the heat released by the body itself, and then return it to the human body. She said that this fabric has appeared several years ago and is widely used in the field of thermal underwear. Salam "Is a more common one.

"Salad", also known as far-infrared radiation acrylic fiber, is a kind of silk material that twists the far-infrared radiation ceramics into acrylic fibers by advanced injection technology. This kind of underwear can reflect the heat generated by the human body through underwear, so as to achieve the effect of keeping warm. According to the industry, this kind of underwear has better thermal insulation than ordinary fabric underwear at the same thickness. However, because this underwear is thin, its thermal effect is limited. This is why Mr. Wang said that when he was windy, he felt "self heating" underwear was not warm. This kind of "thin warm" underwear is hard to keep warm in the cold and windy winter of Beijing.

According to the industry, the "salad" and polyester fibers commonly used in thermal underwear are Chemical fiber 。 She said that wearing chemical fiber fabrics will have some discomfort, so some manufacturers will do some anti static treatment, or even moisturizing effect to ensure comfort. But the price of such thermal underwear will also be high.