What kind of leather is football, what kind of football skin is good

The leather of football can be roughly divided into two types: natural cowhide and synthetic.

Cowhide football is now relatively rare, mainly seen in early football matches. The main features of bovine leather football are:

1. It is easy to be affected by weather conditions

Changes in temperature can affect the hardness and softness of cowhide.

Playing in the rain for long periods of time can greatly increase the weight and deformation of the football.

2. The texture is more solid: because of the toughness and density of cowhide, it is very different from modern synthetic football.

Synthetic materials are commonly known as leather. Nowadays, there are also soccer balls composed of different synthetic materials, layered. As for the specific material, it is estimated that it is a trade secret.

However, most of the modern synthetic materials of the soccer ball use adhesive technology (so that the ball is not easy to absorb water), coupled with the original characteristics of the material, the texture changes less in the case of weather changes, and the probability of deformation under normal game conditions is smaller.

Of course, football is played on grass and smooth floors, and it will be more durable. Cowhide football is basically extinct in the market, and there are many synthetic materials. I have seen the cowhide football, after a long time, it is first fluffing (in fact, it is a trace of leather damage) and then this is the thinning of the leather until it wears out.

Today's soccer balls are made of synthetic leather, and animal skins are no longer used.

Its softness and toughness are better than animal skin!

Solution: There are 3 pieces of black skin around each piece of white skin, and 5 pieces of white skin around each piece of black skin, so that the ratio of black skin to white skin cover Qizhou is 3:5

Column equation: 3x 8=5 8(32-x).

Get x = 20 Answer: 20 pieces of white skin cover, 12 pieces of black skin.

My daughter has this question in her book, and I just finished it).

A soccer ball has 32 pieces of skin, generally black and white, 12 pentagons, and 20 hexagons.

The black ones are regular pentagons, and the white ones are regular hexagons.

If the black skin x block is set, then the white skin is 32 x block, and the vertex number is v

Equation of the number of edges:

5x+(32-x)*6=e*2

Each edge is shared by two pieces of skin).

5x+(32-x)*6=v*3

Each vertex is shared with three skins).

v+32-e=2

Euler's formula) is x=12

So the black skin pentagonal is 12 pieces, and the white skin hexagon is 20 pieces.

A total of thirty-two pieces.

Algorithm: There are 12 pentagons, and each pentagonal has 5 hexagons around it, but in this way, each hexagon is repeated 3 times. So: 12+12*5 3=32

A soccer ball has 32 pieces of skin, usually black and white, 12 pentagons, and 20 hexagons.

The black ones are regular pentagons, and the white ones are regular hexagons.

If the black skin x block is set, then the white skin is 32 x block, and the vertex number is v

Equation of the number of edges:

5x+(32-x)*6=e*2

Each edge is shared by two pieces of skin).

5x+(32-x)*6=v*3

Each vertex rock rolls three skins shared).

v+32-e=2

Euler's formula) is x=12

So the black skin pentagonal is 12 pieces, and the white skin hexagon is 20 pieces.

However, in the 2006 World Cup, the number of match balls "+teamgeist" was unprecedentedly reduced to 14.

32 blocks, 20 hailstones are auspicious hexagons and sails and 12 regular pentagons.

However, in the 2006 World Cup, the number of match balls "+teamgeist" was unprecedentedly reduced to 14.

The leather of La Liga balls is TPU synthetic leather, and the materials of La Liga balls are: rubber, TPU synthetic leather, and EVA

and polyester.

The new season of La Liga matches uses the same surface materials and technology as last season.

La Liga uses the most advanced aerodynamic technology to make the flight path of the ball more precise and enhance the touch of the ball, so that the player's passing and receiving are accurate and smooth, and the air pressure is better controlled to ensure the flight trajectory of the ball.

La Liga uses the extra-ball leather touch to feel the paddle with a good posture and is very non-slip.

A soccer ball has 32 pieces of leather, generally with two colors (black and white), 12 pieces of pentagons, 20 pieces of hexagons Black is a regular pentagon, white is a regular hexagon Set black skin x block, then white skin 32 x blocks, vertices v, edges e, column equation: 5x+(32-x)*6=e*2 (each edge is shared by two skins) 5x+(32-x)*6=v*3 (each vertex is shared by 3 skins) v+32-e=2 (Euler's formula) The solution is x=12 So the black skin pentagonal is 12 pieces, and the white skin hexagon is 20 pieces.

Problem solving ideas: It is obvious that each of the 90 seams is a pentagon and a hexagon, so Daqing assumes that there are x pentagons, a total of 32-x hexagons, which can be determined by the equation (5x 6 (32-x)) 2=90 (the number of seams of the pentagon plus the number of seams of the hexagon, the sum of the two burners divided by 2, because each one is shared, that is, the total number of seam rolling sections is 90), the solution is x=12, so there are 12 pentagons and 20 hexagons.