Corrugated board is a sheet-like material formed by bonding facing paper and corrugated paper that has been processed into a wave shape by corrugated rollers. It is generally divided into single-wall corrugated board and double-wall corrugated board. According to the size of the corrugation, it is divided into five types: A, B, C, E, and F. Corrugated paper has a history of over a hundred years of invention and application, possessing 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. Corrugated paper can be used as packaging for food or digital products, is relatively environmentally friendly, and is widely used.

A-flute and B-flute corrugation are generally used for external transport packaging boxes; beer boxes are usually made from B-flute. E-flute is mostly used for single-item packaging boxes that require certain aesthetic appeal and contain contents 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 such as hamburgers and cream-filled pastries, or as packaging for microelectronic products like digital cameras and portable stereo systems, as well as refrigerated goods.