包裝箱材質選擇： 紙質標準從高到底分為牛皮紙、A、B、C、D級，瓦楞紙分為A、B、C、D級。 紙張克重一般是：每平方米的質量為350g～110g。
1. Different length and grade of carton fiber
The surface is flat and uniform, and the fibers at the fracture are all long after tearing. The color of the surface is the same as kraft paper;
The shorter surface with a little difference in color is Grade A. the surface is flat and uniform, only one layer of fiber on the surface is long. The surface with a difference in color is grade B. the surface of grade C is relatively flat, and the fiber is uneven. Other features are the same as grade B, and grade D do not have the above features.
2. Different arrangement density
The corrugated board made of A-type corrugated board has good cushioning and certain elasticity. C-type corrugated board is less than A-type corrugated board, but its stiffness and impact resistance are better than A-type corrugated board;
The B-type corrugated board has a large arrangement density, and the corrugated board has a flat surface and high bearing pressure, which is suitable for printing; Because the E-shaped ridge is thin and dense, it shows its rigidity and strength.
Material selection of packing case: the paper standard is divided into kraft paper, a, B, C and D from top to bottom, and corrugated paper is divided into a, B, C and D. The weight of paper is generally 350g ~ 110g per square meter.
Corrugated board is made of face paper, lining paper, core paper and corrugated paper processed into corrugated wave by bonding. According to the demand of commodity packaging, corrugated board can be processed into single-sided corrugated board, three-layer corrugated board, five layer, seven layer and eleven layer corrugated board.
The corrugated board with different corrugated shapes has different functions. Even if the same quality face paper is used, the performance of the corrugated board will be different due to the difference of the corrugated shape. There are four types of corrugating shapes commonly used in the world. They are type A, type C, type B and type E. See Table 1 for their technical indicators and requirements.