As the saying goes, “three points of labor, seven points of grinding”. In modern times, grinding products are basically inseparable from sandpaper history of sandpaper is so long. Sandpaper is a material used for grinding. There are sanding paper for wood, metal and other surfaces to make the surface smooth and flat. It is usually made by bonding abrasives on paper. Choose different sandpapers according to different abrasive substances. As the most common grinding tool, sandpaper is mainly polished by thousands of abrasives on the surface. Do you know how the sand on the sandpaper is fixed? Let’s take a look at the manufacturing process of sandpaper.
- Planting sand
- Dry, Shaped and Cut
Put the manufactured roll sandpaper substrate on the machine and open it. The substrates used for sandpaper include cloth, paper and composite substrates. After the abrasive cloth substrate enters the machine and passes between the two rollers, the specifications, dimensions, trademarks and other information will be printed on the back of the abrasive cloth. 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 abrasive cloth coating, so that the adhesive can achieve the best curing effect. sent to the electrostatic chamber. The conveyor moves the prepared sand grains, also named as abrasives, including aluminum, ceramic, zirconium, silicon and so on. under the reel, and the static electricity on the abrasive cloth forms an electric field with the ground. When the abrasive cloth passes through, the abrasive grains in the air are attracted to the abrasive cloth due to the static electricity. In order to absorb enough sand grains, the abrasive cloth will repeatedly enter the electrostatic chamber.
The above process is called sand planting, and sand planting is divided into electrostatic and gravity sand planting.
Electrostatic sand planting
It is sucked up by electrostatic electric field. The advantage is that the distribution of sand is relatively uniform. The disadvantage is that if the sand is too large, it cannot be absorbed. Costs have also increased.
Gravity sand planting
It is sand spread from top to bottom. The advantage is that any particle of sand will do, and the production cost is low. The disadvantage is that the sand is uneven, and finally the sharpness and firmness of the sandpaper is far less than that of electrostatic sand planting.
For more information:
Dry, Shaped and Cut
After that, the sandpaper is sent to a large oven, and as the temperature rises, the sand gradually enters the curing agent, brushes a layer of resin to fix it, and then winds the sandpaper around the reel. Finally cut