Seven-layer corrugated box company, the cartons used on the market generally include ordinary boxes, also called cartoon boxes, low-level boxes (that is, regular-shaped boxes), paper accessories such as knife cards flat cards. The main raw material is a combination of cardboard. At present, the commonly used cardboard is three-layer cardboard, five-layer cardboard seven-layer cardboard. No matter how many layers of cardboard are divided into different pit types, the thickness of different pit types is different. For example, the most commonly used B pit with three layers is about 3 mm thick. The five most commonly used BC pits are about 7 mm thick. The seven most commonly used BCBK pits are about 10 mm thick. Other pit types include E pit thickness of about 1.5 mm, EB pit thickness of about 5 mm, A pit thickness of about 5.5 mm, etc. The cardboard is made of a layer of layer paper corrugated paper glued by a pit paper machine. The outermost layer of paper It is called the face paper, the innermost paper is called the inner paper, the wavy paper in the middle is called the pit paper. For example, A=B, A is the face paper, B is the inner paper. K=K means both the face the bottom paper are K paper. The burst resistance of a carton is determined by the top bottom paper, while the compression resistance is determined by the wavy paper in the middle, which is related to the weight of the paper we usually require.