Sandblasting is a physical method to solve problems that are difficult to solve by chemical methods. Sandblasting technology uses compressed air as power to form a high-speed jet beam to spray materials (shot peened glass beads, steel shot, steel sand, quartz sand, emery, iron sand, sea sand) onto the surface of the workpiece to be processed at high speed, so that The mechanical properties of the outer surface of the workpiece surface change. Due to the impact and cutting action of the abrasive on the workpiece surface, the surface of the workpiece obtains a certain degree of cleanliness and different roughness, so that the mechanical properties of the workpiece surface are improved, thus increasing The fatigue resistance of the workpiece increases the adhesion between it and the coating, prolongs the durability of the coating film, is also conducive to the leveling and decoration of the coating, and removes impurities, variegated colors and oxide layers on the surface. The surface of the medium is roughened, which can increase the residual stress on the surface of the substrate and increase the surface hardness of the substrate. One of the roller manufacturing methods-etching is a chemical surface treatment method, which sometimes affects the appearance of the finished product.

Sandblasting technology can be divided into:
(1) Full gloss (100%): Glass sand
(2) Semi-gloss (50%): 50% glass + 50% steel grit
(3) Matte (0%): Due to the different resin materials used and the differences in injection molding conditions, it is difficult to adjust the gloss of gold steel grit by one shot of sandblasting, so repeat the implementation repeatedly.