Criteria for choosing a good football

　　Are you paying close attention to the recent World Cup? Watching the top players from various countries competing on the field, do you also wish you could go to the green field to show off? So first of all you need a better football, but how to choose a good football? Let's learn together.

　　Choose a brand you trust

　　Big brands require regular factories to produce and manufacture products, and the quality requirements are relatively strict. Balls produced by regular factories will have the factory name, trademark, factory address and other information printed on the ball or packaging. These companies have standardized production, strict management, focus on technology and product quality, and their products are relatively stable and reliable.

　　Football watching material

　　Generally, the outer layer of football is made of PU or PVC. The difference between the two different materials is as follows:

　　PU leather: environmentally friendly, soft to the touch, highly elastic, wear-resistant, cold-resistant, with excellent practical functions such as waterproof, anti-fouling, anti-spill, etc., suitable for indoor and outdoor use.

　　PVC leather: Not environmentally friendly, hard to the touch, wear-resistant, fold-resistant, acid and alkali resistant, etc. However, due to its poor air permeability and hygroscopicity, it is suitable for outdoor use. For those who pursue high quality, PU leather footballs are the first choice. So how to distinguish between two different materials? Here are some identification methods: The easier way to distinguish PU and PVC is that when viewed from the corners, the base fabric of PU is much thicker than that of PVC. ； In addition, there is also a difference in feel. PU feels softer. ； PVC feels harder ； Also, after PU is pressed, the surface will feel wrinkled, while PVC is relatively smooth and flat. ； The last and more extreme method is to burn it with fire. The smell of PU is much lighter than that of PVC.

　　Look at the craftsmanship

　　Generally, footballs have split seams and sewing. Footballs bought in the market are basically machine-sewn, but hand-sewn footballs are high-quality footballs and are not easy to buy. So what is the difference between hand sewing and machine sewing?

　　The hand-stitched ball is a high-end ball. Each piece and stitch is made entirely by hand. It is reinforced with multiple layers of high-strength lining. The thread is thick and the needle holes are large. The ball is strong and resistant to kicking.；

　　Sewn balls are medium and low-grade balls. Each piece and stitch are sewn with a flat machine and a high-speed machine. The last two edges are left and sewn by hand. The thread is thin and the pinholes are small. The sewing lines can be seen on the appearance of the ball.

　　Check the details

　　Check the elasticity of the football: first fill the ball with appropriate air pressure, then lift the ball so that the bottom of the ball is at a height of 1.8m, let it fall freely to the ground, and observe the elasticity of the ball. A good ball elasticity is between 1.2m and 1.4m. Poor quality balls will bounce higher or lower.

　　Check the circumference value of the football: The standard stipulates the circumference size of various balls. The circumference value of the football should be 675-710 mm. A ball with unqualified circumference is difficult to control and its movement trajectory will deviate too much. The inspection method is to place the ball on the flat ground and roll it forward, and observe its trajectory. The rolling path of the ball that meets the standard will be compared, while the rolling path of the ball that does not meet the standard will deviate a lot from the straight trajectory. Or another inspection method is to let the ball free fall multiple times and observe whether it is vertical when it bounces. If it deviates too much, it is a substandard ball.

　　Check the air tightness of the ball: All kinds of balls should focus on checking the air tightness. The ball should have no air leakage, slow deflation, etc. The commonly used inspection method is to fill the ball to a certain pressure and then drip water on the air nozzle. If there are small bubbles, it means the ball is leaking.