Corrugated paper is a board-like material formed by bonding linerboard and corrugated paper shaped by corrugated rollers. It is generally divided into two categories: single-wall corrugated board and double-wall corrugated board. According to the size of the corrugations, there are 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 print adaptability, and convenient storage and handling. Over 80% of corrugated paper can be recycled. 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 cartons, with beer cases typically made from B-flute. E-flute is often 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 referred to as micro-flute, which is an extremely thin type of corrugation, used as disposable packaging containers for foods such as hamburgers, cream-filled pastries, or for packaging micro-electronic products like digital cameras, portable stereo systems, and refrigerated goods.