Corrugated paper is a board-like material formed by bonding linerboard with corrugated paper processed by corrugated rollers. It is generally divided into two types: single-wall corrugated board and double-wall corrugated board. According to the size of the flutes, it is divided into five types: A, B, C, E, and F. The invention and application of corrugated paper have a history of more than a hundred years. It has advantages such as low cost, light weight, easy processing, high strength, excellent printing adaptability, and convenient storage and handling. Over 80% of corrugated paper can be recycled and reused. Corrugated paper can be used for packaging food or digital products, is relatively environmentally friendly, and is widely used.

A-flute and B-flute corrugated board are generally used for outer shipping cartons, and beer cartons are typically made from B-flute. E-flute is often used for single packaging boxes with certain aesthetic requirements and containing appropriate weight contents. F-flute and G-flute corrugated board are collectively known as micro-flute, which is an extremely thin corrugated material used as disposable packaging containers for foods such as hamburgers and cream-filled pastries, or for packaging micro-electronic products like digital cameras and portable stereo systems, as well as refrigerated goods.