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Why does MoPao3s sandpaper stick to the polishing pad instead of fixing it with the buckle?

The MoPao3S automatic polishing machine produced by Laizhou Wei Yi Test Instrument Manufacturing Co., Ltd. has a polishing head pressure of 5-60N, which is higher than that produced by other manufacturers. The sandpaper fixed by the aluminum buckle is easy to roll up because of the high pressure, and the sandpaper must be stuck to the grinding and polishing disc.