1. Add liquid paraffin to the surface of the paper tray, put it in the product, wait for a while, and then absorb a layer of wax film on the surface of the product, so that the moisture-proof function can be realized.
2. Use oily material to spray on the surface of the paper tray.
3. In the process of producing paper trays, increase the amount of stone powder, so that the hardness of the paper trays can increase, even if it is damp, continue to use it.
