self-heating, 37℃ constant temperature, heating black technology... Every winter, the thermal underwear market is very popular, especially some heating underwear named "high technology", which attracts a lot of people to buy it.
Can these underwear that claim to be able to heat up really warm everyone who is afraid of the cold in the cold winter?
" Life Times " interviewed experts to unveil the mystery of "spontaneous heating underwear" and teach you to pick out the one that suits you.
interviewed experts
Director of Science and Technology Popularization Department of the Chinese Textile Engineering Society Can Bai Jie
Can warm clothing really "produce heat"?
According to the law of conservation of energy, heat cannot be generated out of thin air. All " self-heating " are actually heated with the help of external forces. For example, light energy heating fibers rely on absorbing sunlight and reflecting the human body's heat radiation and ; electrical heating fibers heat when they are energized.
Fiber heating must have an energy source. Most of the "super heating underwear" on the market use the principle of fiber absorption and heating.
hygroscopic heating
When the fiber absorbs water, the hydrophilic group in the fiber molecule binds to the water molecule, and the kinetic energy of the water molecule decreases, and is converted into heat energy and released.
hygroscopic heating performance has a lot to do with the fiber moisture rebate rate . The fiber has a large moisture rebate rate, which makes the fiber has a good moisture rebate performance, and a small moisture rebate rate, which makes the moisture absorbing and heating performance poorly. For example, wool and modal fiber have good hygroscopic effects, while ordinary acrylic and polyester have poor hygroscopic effects.
The principle of this type of heating underwear is actually to absorb the moisture of the wearer himself to achieve the function of heating. It is not suitable for dry north. In winter, the human body has less sweat and it is difficult for fiber to absorb moisture and make it heat.
Many people also report that wearing heated underwear is prone to itching in the skin, which may be because the originally dry skin moisture is absorbed by the underwear again.
In addition, after the fiber absorbs enough moisture, the exothermic reaction will slow down, and the moisture will be discharged, which will absorb heat in this process. If the moisture is not discharged in time, it will cause discomfort to the wearer.
People who love to sweat and People who have dry skin are not recommended to choose this type of underwear.
Self-heating thermal underwear on a certain e-commerce platform
Far infrared heating
Another common heating underwear uses the heating method of far infrared fiber, absorbing heat first and then exposing heat, thereby achieving heating to the human body.
For example, "Salam" is a far-infrared radiation acrylic, which is a material obtained by adding far-infrared radiation ceramic particles to acrylic fiber using advanced spinning technology.
Its warming principle is to use the heat released by the wearer to store and conduct, and achieve the insulation effect. It is not that this material itself can heat up. Although underwear made of these materials can have a certain degree of warmth, the specific effect varies from person to person and occasion.
How to choose heat-absorbing and warm clothing
At present, my country does not adopt mandatory standards for hygroscopic heating underwear. Consumers can refer to the industry standard FZ/T 73036-2010 " hygroscopic heating knitted underwear " to evaluate hygroscopic heating underwear.
This standard proposes two indicators on hygroscopic heating performance:
- First, the maximum temperature rise value is greater than or equal to 4.0℃;
- Second, the average temperature rise value is greater than or equal to 3.0℃ within 3 minutes.
When choosing and buying hygroscopic heating underwear, you should pay attention to identifying some exaggerated publicity, and it is recommended to choose formal channels and big brands. You can also check the product tag when purchasing. The thermal underwear that meets the standards will be clearly marked in the execution standard column to comply with the FZ/T73036-2010 "Hydrink Knitted Underwear".
It should be noted that infants and young children are not recommended to wear this type of underwear, because infants and young children have delicate skin, and the moisture-absorbing and heat-absorbing underwear reciprocates in the cycle of moisture-absorbing-dampening-damping, which can easily cause skin discomfort.
In addition, many people who have already purchased this type of clothing are worried that washing too many times will affect its performance. In fact, hygroscopic heating fibers will not be affected after daily cleaning.
However, many moisture-absorbing and heating underwear fabrics are made of a blend of multiple fibers, and some also adopt special weaving technology. It is recommended to wash gently in warm water during cleaning, do not use high-temperature water, and do not rub it hard to avoid exposure to the sun.
What are the differences between different materials
German velvet, pure cotton, modal , lycra...There are many kinds of materials for warm clothing on the market, each of which has its own "specialties", which is dazzling. Which one is suitable for you?
D velvet
is an ultra-fine, special-shaped acrylic fiber, and the composition of this fabric is marked as "acrylic". Defen has excellent softness and fluffy properties, and is not easy to hook, pill or deform. The thinner the fiber, the flutter the fabric, and the better the warmth effect.
pure cotton
cotton fiber is a porous substance, the main ingredient is cellulose , which has good breathability and is the first choice for many people.
If you are worried that the underwear will become damp after sweating, it will be uncomfortable to apply on the skin, and even cause skin diseases such as rash , you can choose a warm clothing made of pure cotton.
artificial cotton
artificial cotton is commonly known as cotton-type staple fiber. It has good hygroscopicity and smoothness. It is a common fabric for making warm clothes and autumn clothes and long-dressing pants.
Generally, the basic composition of artificial cotton is cellulose, which dissolves cellulose in a solvent and then sprays it out of a very thin nozzle to form thin filaments, sometimes also called viscose fibers.
modal
modal, also known as Monel, Mudale, etc., is a cellulose fiber like artificial cotton, and is artificial fiber .
has good comfort and excellent hygroscopicity, and has good drape, but its fabric has poor clarity. It is generally used in underwear products.
ammonia
spandex is the abbreviation of polyurethane fiber, it is a kind of elastic fiber . Spandex fiber, elastic polyolefin fiber and elastic composite fiber are collectively called elastic fiber.
spandex has good elasticity and has good light resistance, acid resistance, alkali resistance and wear resistance, but has poor strength and hygroscopy. Generally, it is often added to the autumn pants fabric as a blend material to increase elasticity.
Laika
"Laika" is the transliteration of the English word "LYCRA" and is also a kind of spandex.
It further optimizes the performance of spandex, improves the elasticity and extension of the fabric, and has less restraint on the human body. And can be used with any fabric, called "friendly" fiber.
Sheep velvet
Clothing with cashmere ingredients has the highest warmth index, but be careful that people who are allergic to wool are not suitable for wearing autumn pants containing cashmere ingredients.
Bamboo fiber
Bamboo fiber is cellulose fiber extracted from bamboo , also known as bamboo fibres, and its chemical components are mainly cellulose, hemicellulose and lignin .
This fabric has good breathability, instant water absorption, wear resistance and dyeing properties, and has natural antibacterial, antibacterial, mite removal, odor prevention and anti-ultraviolet rays.
polyester fiber
polyester fiber is actually polyester, its advantages are its wrinkle resistance and shape conformity, and it has high strength and elastic recovery ability.
is dry in winter, and clothes made of this material are prone to static electricity. It is best to apply some moisturizer before wearing it. Some people with dry skin, itching or allergic, as well as children with delicate skin, try to avoid wearing this fabric. ▲
Editor of this issue: Wang Xiaoqing
Copyright Statement: This article is original by Life Times and reproduction is prohibited without authorization.
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