1、纸箱纤维的长度不同，等级不同
表面平整均匀且撕裂后断裂处纤维全部是长的面里是一样的颜色是牛皮纸；
短一些的面里颜色有点点差别的是A级,表面平整均匀只有表面一层纤维长，面里颜色有差别的是B级,C级外表比较平整，纤维不均匀其它同B级，D级则是以上特征都没有。
2、排列密度不同
A型楞制成的瓦楞纸板具有较好的缓冲性，富有一定的弹性，C型楞较A型楞次之，但挺度和抗冲击性优于A型楞；
B型楞排列密度大，制成的瓦楞纸板表面平整，承压力高，适于印刷；E型楞由于薄而密，更呈现了它的刚强度。
包装箱材质选择： 纸质标准从高到底分为牛皮纸、A、B、C、D级，瓦楞纸分为A、B、C、D级。 纸张克重一般是：每平方米的质量为350g～110g。
瓦楞纸板是由面纸、里纸、芯纸和加工成波形瓦楞的瓦楞纸通过粘合而成。根据商品包装的需求，瓦楞纸板可以加工成单面瓦楞纸板、三层瓦楞纸板、五层、七层、十一层等瓦楞纸板。
不同波纹形状的瓦楞，粘结成的瓦楞纸板的功能也有所不同。即使使用同样质量的面纸，由于楞形的差异，构成的瓦楞纸板的性能也有一定区别。国际上通用的瓦楞楞形分为四种，它们分别是A型楞、C型楞、B型楞和E型楞。它们的技术指标和要求见表一。
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.
