How are sanding discs made?

Sanding sheet, also known as sandpaper, emery cloth or abrasive sheet, is a surface treatment tool, usually composed of abrasive, adhesive and substrate.
Select substrate: The substrate is the supporting part of the sanding sheet, which can be paper, cloth, plastic or other materials. The choice of substrate depends on the purpose and strength requirements of the final product.
Selection of abrasive: Abrasive is a hard particle used for grinding. Common abrasives include aluminum oxide, silicon carbide, etc. The particle size (coarseness) and type of abrasive will affect the grinding performance of the sanding sheet.
Preparation of adhesive: The adhesive is used to fix the abrasive to the substrate. The type and ratio of the adhesive will affect the durability and grinding effect of the sanding sheet.
Mixing abrasive and adhesive: Mix the selected abrasive and adhesive in a certain proportion to form a uniform mixture.