... 3 ,5 ,and 7layer machine! Corrugated board production line generally includes the following parts: Mill Roll Stand, Pre-heater, Single facer, Overhead ... requirements of the customers. This finished product, single wall corrugated board, is mainly introduced as inner packing material. It can be ... also used as outer packing material for light or small-sized commodities. Five flutes A, B, C , E ...