Source: aibang polymer
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1、 A brief introduction to the types and applications of carbon fiber composites
Carbon plate, that is, carbon fiber composite. Carbon fiber is usually made of polypropylene fine fiber by high temperature carbonization. According to its length, it can be divided into short carbon fiber, long carbon fiber and continuous carbon fiber. Then carbon fiber composite can be obtained by resin impregnation. According to the types of impregnated resin, it can be divided into thermosetting resin and thermoplastic resin.
Thermosetting resin based carbon fiber composite materials include epoxy resin, bismaleimide resin, unsaturated polyester resin, vinyl resin, etc., and epoxy resin is commonly used. Thermosetting resin based carbon fiber composite materials include nylon material, polycarbonate material, polyolefin material, commonly polyolefin material.
Carbon fiber composite has the advantages of light weight, more tenacity, more elasticity and good fatigue resistance, which is mainly used in aerospace, F1 racing and other fields. In recent years, the application of carbon fiber composite in basketball shoes and racing shoes is also common.
2、 Analysis on the application of carbon fiber composite material in racing shoes
The application of carbon fiber composite materials to racing shoes not only strengthens the structure of the midsole, provides arch support stability, but also plays a more magical role: rebound strength, provides strong thrust, improves running efficiency and saves the physical strength of runners.
As a high-end material, the following two aspects of technological progress promote the application of carbon board in footwear materials to a certain extent.
1. The carbon plate puts forward higher requirements for the materials of the cushioning center bottom
The super performance of carbon board running shoes is not entirely due to the rebound of carbon board, it is the result of the perfect combination of the cushioning midsole and carbon board.
Carbon plate is just to maintain the rigidity and rebound of running shoes, so it means that good cushioning materials are needed to reduce the hard impact of carbon plate on the feet, thus putting forward higher requirements for the cushioning midsole: lightweight, high thickness and good cushioning performance.
The technical progress of the cushioning materials can meet these performance requirements to a large extent. For example, the high thickness requires that the cushioning materials have lower foam density.
From the comparison of TPU, TPEE and PEBA foam bead density, we can see that PEBA foam density is the smallest, which is not difficult to understand why Nike and Li Ning will choose it as the cushioning material for high-end racing shoes.
Data source: speech materials of the 5th footwear elastomer Summit Forum - "supercritical fluid foaming of elastomer materials", Qingdao University of science and technology, Zhang Zhenxiu
2. The development technology and technology of carbon fiber composite materials are developing and improving continuously
Due to the limitation of material, technology and type, the cost of early carbon fiber composite materials for shoes is very high, and the output is relatively low, so the price of carbon board basketball shoes is quite amazing, and it is a small piece, mainly providing support and torsion resistance.
With the development of development technology, the variety of carbon fiber composite materials can be more selective. In addition to the traditional mold, the process selection can also use 3D printing, and the development cost is further reduced. So the chip and full-length carbon board began to appear, especially the full-length carbon board, which mainly plays the role of springback and boosting. It is said that Nike vapor flyelite's sole interlayer has a rebound force of 85%, in which carbon board plays an important role.
3、 Examples of full-length carbon board running shoes of sports brands in recent two years
Carbon board was first used in basketball shoes, such as Reebok pump fury, which is mainly used to prevent athletes from being injured in the actions of sudden stop, sharp turn, rapid acceleration, change direction, etc., and play a role of stabilizing the shoe body, arch support and anti twist.
ReebokPumpFury
And carbon board is concerned by the public after Nike applied it to racing shoes. In 2017's breaking2 challenge, Kipchak shocked the public by running 2 hours and 25 seconds in vaporflyelite, Nike's first carbon running shoe. Nike is also regarded as the pioneer and leader of carbon running shoes.
Later, it's not hard to find that the newly launched racing shoes in the past two years have started to appear carbon board frequently. Adidas, Li Ning, Tebu, hokaoone and other brands have launched flagship carbon board running shoes, which are not small carbon boards, but full-length carbon boards.
1. Nike next%
Next% is upgraded from vapor fly 4%, equipped with zoomx midsole (foamed PEBAX), built-in shovel type full-length carbon board structure, which increases the hardness compared with the previous generation, and the shoe body is not easy to bend. The midsole with carbon board will quickly decompose and rebound the landing buffer, so as to bring continuous propulsion to the runner.
VAPORFLY NEXT%
VaporFlyElite
2. Adizeropro
Adizeropro is Adidas's first speed running shoe with built-in carbon fiber board, which is equipped with multi-directional carbon fiber board and classic cushioning material boost (etpu).
Adizeropro
Adizeropro
3. Li Ningfei
In addition to the Li Ning? Midsole Technology (foamed PEBAX), Li Ning Feidian also uses a more advanced embedded full-length heterogeneous carbon board than the ordinary carbon board with uniform density. Using the different stiffness of different positions and different weaving methods of the heterogeneous carbon board, combined with the special angle through multiple tests and adjustments, the carbon board can work together with the? Technology midsole, and the bending and rebound performance of the carbon board can be improved Lift off efficiency.
Li Ningfei
Of course, in addition to the above full-length carbon shoes, there are Suo koni endorphin pro, new balance fuel cell TC and so on. Here is just a simple example.