What is the process of pvc foam board?

The production process of rigid PVC crust foam board is as follows: PVC resin + additives → high speed mixing → low speed cold mixing → conical twin-screw extrusion → mouth die assignment (crust foam) → cooling and shaping → multi-gum spokes traction → cutting products → collection and inspection. The size of the produced rigid PVC crust foam board is 1 220 mm×2 440 mm, and the thickness of the products is 8-32 mm.