Wooden pallet companies generally have the higher the hardness, the better the quality. Thickness material are the two key factors that determine the hardness of the carton. There are usually three-layer five-layer cartons, of course there are thicker seven layers. The more layers the cartons are, the thicker they are. Three-layer is a simple three-layer flat board, but two-layer flat board with a layer of corrugated in the middle, the fifth-layer consists of three-layer flat board double-corrugated; three-layer five-layer cartons are also listed as corrugated double-corrugated boxes; there are many carton materials Good materials are only high in hardness, but also light in weight. Poor materials tend to have low hardness are easy to deform; the carton materials on the market are "KK>KA>KB>AA>AB>BB" high to bottom. The KK material is currently a very good material. The thickness of three layers is enough to carry the weight of a normal adult. The surface is smooth textured. KK is good, but the price is also the most expensive. Although the hardness of AA BB is slightly weaker, But with the thickness of five layers, Kunshan corrugated box manufacturer also has a high hardness, which is enough to protect the product damage. Guangzhou Carton Factory recommends that sellers choose different types of cartons according to their needs. For example, five-layer AA cartons can be used for fragile valuable items, ordinary items that have been dropped, the product itself comes with a carton. It is enough to choose three-layer cartons. Up.