1.The cardboard consists of a layer of core paper and cowhide card is called "corrugated cardboard".
Corrugated cardboard, generally used for bedding, spacing and wrapping irregular objects.
2. The cardboard consists of one layer of core paper and the upper and lower two layers of cowhide card is called "single pit board".
3. The two-layer core paper is divided into three layers of cowhide card, which is called "double pit board".
Double pit board can be composed of different pit width and different paper, such as "B" pit paper with "C" pit paper.
4. The three-layer core paper is divided into four layers of cowhide card, which is called "three-pit cardboard".
5. The ultra-strong catamaran board is developed from the single pit board, and the core paper in the middle is made of two pieces of thick cored paper.