Sandpaper is a material used for grinding. It can polish the surface of wood, metal, etc. to make the surface smooth and flat. It is usually made of abrasives bonded to paper. The choice of different abrasive materials varies. sandpaper.

Sandpaper can be divided into sandpaper and sanding belts according to their shapes. Sandpaper is just like the paper we use and can be torn directly by hand. The back of the sanding belt is usually made of cloth, which is suitable for use with sanding machines and is more durable. .

According to different abrasive materials, it can be divided into dry sandpaper, water sandpaper and sponge sandpaper.

Manufacturing of sandpaper:

1. Place the manufactured roll sandpaper base on the machine and open it. The bases used for sandpaper include cloth, paper and composite bases. The sandpaper base enters the machine. After passing between two rollers, specifications, dimensions, trademarks and other information will be printed on the back of the emery cloth.

2. The rubber roller with printing function prints the cured adhesive at the same time. At this time, the computer will measure the density of the emery cloth coating to achieve the best curing effect of the adhesive, and then proceed. For electrostatic treatment, the abrasive cloth coated with adhesive is sent into the electrostatic chamber.

3. The conveyor moves the prepared sand grains under the drum. The static electricity on the emery cloth forms an electric field with the ground. When the emery cloth passes by, the abrasive sand grains in the air are attracted to the emery cloth due to the static electricity. , in order to absorb enough sand, the emery cloth will repeatedly enter the electrostatic chamber.

4. The above process is called sand planting. Sand planting is divided into two types: electrostatic sand planting and gravity sand planting.

Electrostatic sand planting relies on the force of electrostatic electric field to attract sand. The advantage is that The distribution of sand is relatively uniform. The disadvantage is that if the sand grains are too large, they cannot be sucked. The larger the sand grains, the greater the electric field force, which means that the voltage and current will increase, and the production cost will also increase.

Gravity sand planting means that sand is spread from top to bottom. The advantage is that any particle of sand is suitable and the production cost is low. The disadvantage is that the sand is uneven, which ultimately results in the sharpness and firmness of the sandpaper being far inferior. Electrostatic sand planting.

Then the sandpaper is sent into a large oven. As the temperature increases, the sand gradually enters the curing agent, is brushed with a layer of resin to fix it, and then the sandpaper is wound onto a reel.

5. Abrasive mesh size: The abrasives on sandpaper are all artificial sand grains, mainly silicon carbide and aluminum oxide. Their unique characteristics are high temperature resistance and wear resistance, which make them an ideal material for making sandpaper. The sandpaper we buy can be either coarse or fine. Generally, the mesh number represents the thickness of the sandpaper. The mesh number is usually printed on the back of the sandpaper. The mesh number is determined based on the number of sieve holes per square inch, which means there are Multi-mesh, the larger the mesh number, the more mesh holes per square inch, the finer the abrasive, and vice versa. For example, 80 mesh means that there are 80 mesh holes per square inch on the screen, so the 80 mesh marked on the sandpaper means that the abrasive used in this sandpaper is sieved through an 80 mesh screen.