Corrugated paper is a board-like material made by bonding face paper and corrugated paper formed into a wave shape through a corrugating roller. It is generally divided into two types: single-wall corrugated board and double-wall corrugated board. According to the size of the corrugations, 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 one hundred years. It has advantages such as low cost, light weight, easy processing, high strength, excellent printability, and convenient storage and transportation. More than 80% of corrugated paper can be recycled and regenerated. Corrugated paper can be used for packaging food or digital products, is relatively environmentally friendly, and is widely used.

A-flute and B-flute corrugations are generally used for outer shipping boxes; beer boxes are typically made with B-flute. E-flute is often used for individual packaging boxes that require certain aesthetic appeal and contain items of appropriate weight. F-flute and G-flute corrugations are collectively known as micro-flute, which is an extremely thin corrugation used as disposable packaging containers for foods like hamburgers and cream-filled pastries, or for packaging micro-electronic products such as digital cameras, portable stereo systems, and refrigerated goods.