How does the edge treatment technology of sandpaper affect its performance in fine grinding?

The edge treatment technology of sandpaper, as a detail, actually has a really important role in how well the sandpaper works during fine grinding. This technology not only matters for how easy it is to use the sandpaper, but also directly influences the grinding result and the quality of the final product.
The sharpness of the edge treatment is directly linked to the scratch problems that might happen when grinding. If the edge of the sandpaper is too sharp, it's very easy to leave tiny and hard-to-get-rid-of scratches on the surface of the material during fine grinding. These scratches not only ruin the smoothness of the grinding surface, but might also affect the next steps of processing or how good it looks, especially when the surface smoothness is needed a lot, this effect is especially obvious.
The flatness of the edge decides how evenly the force is when grinding. If the edge isn't treated well and there are bumps and dips on the sandpaper surface, during grinding, the contact area between the sandpaper and the material will change, and that will affect how even the grinding result is. This not only might cause color differences or uneven gloss on the surface after grinding, but also might make the sandpaper wear out faster because of uneven force, reducing its lifespan.
The durability of the edge of the sandpaper is also closely related to its edge treatment technology. If the edge treatment isn't good enough, the sandpaper is likely to get damaged or lose sand during grinding. This not only lowers the grinding efficiency but also might increase the cost because you have to change the sandpaper often. This effect is especially clear in situations where you're working for a long time or continuously.
Different application scenarios have different needs for the edges of the sandpaper. For example, in making handcrafted leather goods, the quality of edge grinding directly affects how good the finished product looks and feels. If the edges of the sandpaper aren't handled properly, it might make the edges of the leather goods look rough and even affect how comfortable they are to use.