1、紙箱纖維的長(zhǎng)度不同，等級(jí)不同
表面平整均勻且撕裂后斷裂處纖維全部是長(zhǎng)的面里是一樣的顏色是牛皮紙；
短一些的面里顏色有點(diǎn)點(diǎn)差別的是A級(jí),表面平整均勻只有表面一層纖維長(zhǎng)，面里顏色有差別的是B級(jí),C級(jí)外表比較平整，纖維不均勻其它同B級(jí)，D級(jí)則是以上特征都沒有。
2、排列密度不同
A型楞制成的瓦楞紙板具有較好的緩沖性，富有一定的彈性，C型楞較A型楞次之，但挺度和抗沖擊性優(yōu)于A型楞；
B型楞排列密度大，制成的瓦楞紙板表面平整，承壓力高，適于印刷；E型楞由于薄而密，更呈現(xiàn)了它的剛強(qiáng)度。
包裝箱材質(zhì)選擇： 紙質(zhì)標(biāo)準(zhǔn)從高到底分為牛皮紙、A、B、C、D級(jí)，瓦楞紙分為A、B、C、D級(jí)。 紙張克重一般是：每平方米的質(zhì)量為350g～110g。
瓦楞紙板是由面紙、里紙、芯紙和加工成波形瓦楞的瓦楞紙通過粘合而成。根據(jù)商品包裝的需求，瓦楞紙板可以加工成單面瓦楞紙板、三層瓦楞紙板、五層、七層、十一層等瓦楞紙板。
不同波紋形狀的瓦楞，粘結(jié)成的瓦楞紙板的功能也有所不同。即使使用同樣質(zhì)量的面紙，由于楞形的差異，構(gòu)成的瓦楞紙板的性能也有一定區(qū)別。國際上通用的瓦楞楞形分為四種，它們分別是A型楞、C型楞、B型楞和E型楞。它們的技術(shù)指標(biāo)和要求見表一。
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.
