Large tows and small tows are divided according to the number of K. 1K means that a bundle of carbon fiber contains 1,000 raw filaments. Similarly, 3k means 3000 sticks, and 6K means 6000 sticks. 1K, 3K, 6K, 12K, and 24K are called small tow carbon fibers, and those above 48K are called large tow carbon fibers. So what is the difference between large tow carbon fiber and small tow carbon fiber materials?
The sizing rate of large and small tow carbon fibers was compared and tested, and it was found that the sizing rate of domestic carbon fibers is generally higher than that of foreign carbon fibers, and for 12K carbon fibers, the sizing rate of domestic carbon fibers is higher than 1%, while the sizing rate of foreign carbon fibers is generally low 3K carbon fiber has the lowest surface sizing rate, 50K carbon fiber has the highest surface sizing rate, and the sizing rate of carbon fiber tow is similar.
For the single fiber strength test of 12k carbon fibers produced by different manufacturers at home and abroad, the shape parameters of the foreign carbon fiber single fiber strength are generally higher than the domestic carbon fiber shape parameters, indicating that the dispersion of the foreign carbon fiber single fiber strength is smaller than that of the domestic carbon fiber, that is, the stability is higher than that of the domestic carbon fiber. carbon fiber. The scale parameters of foreign carbon fibers are generally higher than those of domestic carbon fibers, indicating that the strength of foreign carbon fibers is higher than that of domestic carbon fibers. For carbon fibers with different tow sizes, the shape parameters of large tow carbon fibers fluctuate greatly, while the shape parameters of small tow carbon fibers fluctuate very little, indicating that the stability of large tow carbon fibers is not as good as that of small tow carbon fibers.
The interfacial shear performance of carbon fiber produced by dry jet wet spinning process is better than that of carbon fiber produced by wet spinning process. The interfacial shear performance of domestic carbon fiber is generally lower than that of foreign carbon fiber, and the interfacial shear strength of large tow carbon fine resin is low For small tow carbon fibers.
Compared with large-tow carbon fiber materials, small-tow carbon fiber carbonization equipment is better, the production process is strictly controlled, and its performance is generally better than large-tow carbon fiber.
Since the development of small tow carbon fiber, it has been mostly used in the aerospace field. At present, it also has many applications in the fields of automobile manufacturing, rail transit, and high-end medical treatment.