I suggest you choose the best material for buying tennis rackets, such as carbon rackets, carbon aluminum rackets or carbon fiber rackets. The material of the racket is not good, and your wrist will be injured when you play. Do you have this experience? When you hold a steel pipe tightly and hit a big stone hard, you will feel pain and numbness in your whole hand. If you hit it with another stick, you will feel much better. This is the damping performance of the material. Many tennis friends have bought tennis rackets with poor shock absorption, and their wrists will gradually hurt. After a long time, the wrist will bulge, and it will hurt if you push hard. Besides, this bag is not easy to cure.
The material of tennis racket determines the performance and hitting feel of tennis racket, not a certain brand, but also many products on the market.
1, carbon fiber tennis racket has light weight, good mechanical properties, good impact resistance, good hitting feel, good shock absorption, and small vibration does not hurt the wrist.
2. Carbon fiber is a fibrous carbon material, which uses some organic fibers (such as nylon, acrylic, rayon, etc.). ) is used as raw material, and organic fiber is carbonized in rare gas at high temperature and pressure of 2000-3000 degrees. Generally used in aviation, military and so on.
3. Carbon materials are usually materials containing carbon elements in powder form, such as graphite.
A, tennis racket material carbon aluminum material, carbon titanium material is cheaper.
B, tennis racket material fiberglass 400- 1200 yuan.
C, tennis racket material carbon/glass fiber (carbon material/glass fiber) price is generally 700- 1300 yuan.
D, tennis racket material carbon fiber (carbon fiber) price is generally 1700-3000 yuan.
Carbon fiber is a kind of high strength fiber, as soft as rope. It should be combined with the resin matrix and cured. The proportion of resin is generally between 38% and 57%. The higher the resin content, the worse the tennis racket performance and the cheaper the price. There are tennis rackets with resin content below 34%, which are special rackets for professional competitions and are very expensive. Commonly used resins are: polyester, epoxy resin, thermoplastic resin, etc. Among them, epoxy resin-based carbon fiber tennis racket has the best performance, several times higher than other resins, and the racket has the highest price. The racket for professional competition adopts epoxy resin-based carbon fiber prepreg, with epoxy resin content of 34% and carbon fiber content of 66%. I don't have a tennis racket made of 100% carbon fiber because it can't be molded at all. This is a lie of the merchants. In foreign countries, they dare not label materials like this.
5. Carbon fiber prepreg 125g/m2, excluding tax 137.3 yuan /m2, multiplied by tax 17%, the blank weight of a racket is 330-350g；; In addition, the corner loss is reduced by about 430 grams. Plus labor, grinding, painting (85- 1 10 yuan/piece), auxiliary materials (70- 120 yuan/piece), packaging (85- 160 yuan/piece), defective rate, production equipment and so on. Plus the profits of sellers and retailers, plus 5% business tax, plus 20% income tax, etc ... the cost of materials is only a small part of the sales price. Take our commonly used nail clippers as an example. Its material cost is less than 0.23 yuan. The retail price of 3 yuan nail clippers is relatively poor. The retail price of nail clippers commonly used in our family is about 8- 10 yuan. However, the production process and technology of nail clippers are much simpler than those of carbon fiber tennis rackets. Let's look at the gap between the material cost and the sales price of daily necessities, cosmetics and large and medium-sized consumer goods. If 300-500 yuan can buy 100% carbon fiber tennis racket, that BMW car can be easily bought for 50,000 yuan.
6. The surface of the tennis racket is painted with a beautiful layer of paint. What material is under the paint? I can't see it at all.
7. Carbon fiber tennis rackets can't be distinguished just by knocking. Only metal and nonmetal materials can be distinguished. Tennis rackets made of nonmetallic materials include carbon, carbon titanium/carbon titanium, glass fiber, carbon fiber/glass fiber, carbon fiber/glass fiber and carbon fiber. Merchants distinguish between true and false carbon fiber tennis rackets and guide them to distinguish between metal and nonmetal materials, either metal rackets or all-carbon fiber tennis rackets. This method is wrong. Maybe the merchants don't understand, maybe the merchants ... it's hard to say! ! !
8. When buying high-priced tennis rackets, it is best for the merchants or manufacturers to make a written commitment to the ingredients of the tennis rackets, if they are genuine, they will be valid for at least 3 years. In this way, when you want to replace the racket or the racket is damaged, you can see it clearly by sawing it. Glass fiber, carbon fiber, carbon, carbon aluminum, carbon titanium and other materials can be distinguished. There are more and more people who know about carbon fiber in China. Take the sawed part and ask for advice. It's fake. You can sue him for fraud and demand compensation. At present, there are many materials in the domestic market.
9. Many brands of tennis rackets are made in China. Generally, brands are not fake, but all kinds of materials are used. The materials used to make tennis rackets determine the performance, quality and feel of tennis rackets. When buying a tennis racket, it is better to choose a brand than a material (if you can distinguish the materials), and it is better to choose a written commitment. Remember! Carbon tennis racket and carbon fiber tennis racket are two kinds of materials, and their performance is far from each other, and their prices are far from each other.
10, carbon fiber is made of different materials. The performance and price of carbon fiber with modulus from T 100, T200, T300-T700 are far from each other.
1 1. From the technical point of view, 100% carbon fiber prepreg is used, with carbon fiber content of 67% and epoxy resin content of 33%. Carbon fiber can be multi-directional and multi-layered with 30 degrees +60 degrees +90 degrees +0 degrees. This tennis racket has the best performance. Because: 1 According to the structural characteristics of the tennis racket, the mechanical strength of the tennis racket can be enhanced by using the mechanical strength performance in the direction of carbon fiber. So that the tennis racket can easily bear greater impact from all directions and angles. 2. The tennis racket made of carbon fiber prepreg has excellent damping performance and the best hitting feel. 3. With the decrease of carbon fiber prepreg content, other materials (including resin content) in carbon fiber tennis racket increase; The damping performance will deteriorate, the hitting feel will deteriorate, and the mechanical properties of the tennis racket will also decline. This process is complex and difficult, with low production efficiency, high production cost and high rejection rate. Few manufacturers have the technology to produce, and only a small amount of production. There are such production enterprises in China, which produce special sporting goods for professional athletes for well-known foreign brands. You can call the factory that actually produces carbon fiber tennis rackets to find out the price. It's best to buy a full carbon fiber tennis racket from the manufacturer. Except the factory, the ex-factory price can't be bought anywhere; The most assured and affordable (plus mailing costs are also very affordable).