The Mattress Convoluted Foam Cutting Machine uses a CNC lathe to process round head nails (to prevent sponge from being pressed through), which is used to cut sponges or similar materials into two concave and convex corresponding products.
link:https://www.demingmachinery.com/foam-cutting-machine/pu-foam-cutting-machine/mattress-convoluted-foam-cutting-machine.html