Generally, 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 of the cartons, the thicker they are. Three layers are Simple three-layer flat board, but two-layer flat board with a layer of corrugated in the middle, five-layer flat board with three-layer flat board double-corrugated; three-layer five-layer cartons are also listed as corrugated double-corrugated boxes; there are also many kinds of carton materials, good The material is only high in hardness, but also light in weight. Inferior materials are often very low in hardness easy to deform; the material of the carton on the market is "KK>KA>KB>AA>AB>BB" high to bottom, KK material is At present, the material is very good. 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 are slightly weaker, they are matched with five The thickness of the layer, Kunshan corrugated box manufacturer also has a high hardness, 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.