Principle: Carbon fiber belongs to the conductor, and the heating principle is the same as aluminum wire and copper wire. The difference is that carbon fiber can emit far-infrared rays during heating, which is very beneficial to human health (far-infrared is called the light of life in the human body by the medical community).
The difference between 24k and 12k carbon fiber:
1. The heating principle of carbon fiber: voltage is applied at both ends of the filament carbon fiber, the carbon molecules in the filament carbon fiber do hot brown motion under the action of electromotive force, and the carbon molecules generate heat when they collide with each other during the movement, and when there are more carbon molecules in the heating element, the more intense the hot brown motion generates more heat; Therefore, the electrothermal conversion capacity of 24K is better than that of the lower K number.
2. The tensile strength of carbon fiber is 8 times that of the same steel, and its tensile strength increases geometrically when the carbon fiber bundle increases. In this way, it can be very good for the damage of carbon fiber caused by pulling in the field construction.
3. The increase of carbon fiber bundle also increases the heat dissipation area of the heating element, and the heat generated is just more dissipated to achieve the purpose of energy-saving heating.
4. The increase of carbon fiber bundle makes it possible to make the line length longer and the power larger under the same line power (12K generally uses 9.5 meters 150W/root, 24K generally uses 12.5 meters 230W/root); This reduces the amount of carbon fiber joints when the room is laid with the same power, and also reduces safety hazards.
Extended profile
1K=1000(roots), 3K=3000(roots), 6K=6000(roots), 12K=12000(roots). At the same time, 1K, 3K, 6K, 12K are also called small tows.
According to the number of monofilaments in the carbon fiber tow, carbon fiber can be divided into two types: small tow and large tow. Compared with small tows, the disadvantage of large tows is that when making structures such as plates, the tow should not be unfolded, resulting in an increase in the thickness of a single layer, which is not conducive to structural design.
In addition, there are more phenomena such as large tow carbon fiber adhesion and wire breakage, which will affect the strength and stiffness, reduce the performance, and the dispersion of the performance will be larger. Airplanes and spacecraft generally only use small tow carbon fiber, so small tow carbon fiber is also called "aerospace grade" carbon fiber, and large tow carbon fiber is called "industrial grade" carbon fiber.
However, the production cost of large tow is lower than that of small tow, and with the advancement of production technology, people are familiar with the structure of carbon fiber materials, and large tow carbon fiber is increasingly used in areas with strict reliability requirements.
In this way, the distinction between small tow and large tow has also changed, such as the early number of monofilaments in the tow was 12,000 (12K) as the dividing line, but the current monofilament number of 1K ~ 24K carbon fiber is divided into small tows, and those above 48K are classified as large tows.
Airbus has begun to use 24K carbon fiber in the manufacture of the A380 superjumbo aircraft, and it is estimated that as technology advances, the dividing line between small tows and large tows will be pushed up.
