The frequency of sandpaper replacement depends on various factors, including usage frequency, the degree of sandpaper wear, the material used, and the grinding effect to be achieved. Generally speaking, replacing sandpaper should be considered in the following situations:


1. Severe wear of sandpaper: When the abrasive particles of sandpaper become significantly dull or fall off, the surface becomes uneven, or cracks appear on the sandpaper, it is usually necessary to replace it with a new sandpaper to ensure the grinding effect and processing quality.


2. Loss of adhesion of sandpaper: Sandpaper is usually fixed to the sandpaper substrate through adhesive on the back. If the adhesive loses adhesion, the sandpaper cannot effectively adhere to the sandpaper bed or grinding wheel. At this time, a new sandpaper should be replaced.


3. Excessive accumulation of sandpaper: During the grinding process, sand chips, debris, and grinding residues may accumulate on the surface of the sandpaper, affecting the grinding effect. When there is too much accumulation on the surface of the sandpaper, it should be cleaned or replaced with a new sandpaper in a timely manner.




It should be noted that different materials and grinding tasks have different requirements for the degree of wear of sandpaper, so the time for replacing sandpaper may vary. In actual use, it should be determined based on the actual situation whether sandpaper needs to be replaced to ensure the efficiency and quality of the grinding operation.