Corrugated paper is a board made of hanging paper and corrugated paper formed by processing corrugated rollers. It is generally divided into two types: single corrugated cardboard and double corrugated cardboard. According to the size of corrugated paper, it is divided into five types: A, B, C, E and F. The invention and application of corrugated paper has a history of more than 100 years. It has the advantages of low cost, light weight, easy processing, high strength, excellent printing adaptability, convenient storage and transportation, etc. More than 80% of corrugated paper can be recycled. Corrugated paper can be used as packaging for food or digital products, which is relatively environmentally friendly and widely used.

Type A corrugated and type B corrugated are generally used as outer packing boxes for transportation, and beer boxes are generally made of B. E-Leng is mostly used as a single packing box with certain aesthetic requirements and proper weight contents. F-type corrugated and G-type corrugated are collectively referred to as micro-corrugated, which is a kind of extremely thin corrugated, and is used as a disposable packaging container for hamburgers, cream pastries and other foods, or as a packaging for micro-electric products such as digital cameras, portable combined acoustics and refrigerated commodities.