The carton factory produces 50,000 square meters of multi-layer high-strength corrugated board boxes annually, starting operation in September 2019. High-strength corrugated paper is made by adhering linerboard and wave-shaped high-strength corrugated paper processed through a corrugating roller into a board-like material. It is generally divided into two categories: single-faced high-strength corrugated board and double-faced high-strength corrugated board. According to the size of the corrugations, they are classified into five types: A, B, C, E, and F. The main physical properties of corrugated board usually include burst strength, edge crush strength, flat crush strength, bonding strength, and puncture strength.