The main function of corrugated box is to protect the contents from environmental damage (physical, chemical, mechanical, climatic, etc.). The original national standard divides corrugated boxes into three categories, which are also three grades. It is mainly divided according to the value of export, domestic sales and contents. With the development trend of domestic and international trade and economic internationalization, the original division method is not scientific and reasonable.

新修订的瓦楞纸板标准拟将纸板划分为“优等品”和“合格品”，对于瓦楞纸箱来讲也不尽合适。如果划分等级应该按照其将遇到的流通环境条件的严酷程度划分。而且作为标准，应该对瓦楞纸箱提出一个限度的要求即可，但考虑到我国的现状及使用习惯，将其划分为两类。即：1类纸箱主要用于储运流通环境比较恶劣的情况；2类纸箱主要用于流通环境较好的情况。

The newly revised corrugated board standard is intended to divide cardboard into "superior products" and "qualified products", which is not suitable for corrugated boxes. If it is classified, it should be classified according to the severity of the circulation environment conditions it will encounter. And as a national standard, corrugated boxes should be put forward a minimum requirement, but considering the current situation and use habits of our country, it is divided into two categories. That is: the first type of cartons is mainly used for the storage and transportation of relatively bad circulation environment; the second category of cartons is mainly used for the better circulation environment.

⑴瓦楞纸板的瓦楞型号瓦楞的型号，按楞高分为A,B,C,E四类，不同瓦楞纸板的力学性能也不同。A型瓦楞纸板的平面压力高，抗压强度较大，B型则相反，C型的平面压力、垂直压力、平行压力和缓冲力都较好；瓦楞纸板间的厚度，A型大，C型次之，B型再次之，E型小，由于厚度小的纸板加工折弯较容易，因此，B形瓦楞纸广泛用于对箱的耐压强度要求不高的包装运箱.根据瓦楞纸板的不同力学性能，单面瓦楞纸箱用A或C型为好，双面瓦楞纸箱用A,B型或B,C型相结合为宜，接近外表面的用B型，能起到抗冲击作用。A,B型或B、C型相结合，可提高纸箱物理机械性能；从印刷适性上比较，B型和C型均利于印刷。

(1) the corrugated model of corrugated board, the model of corrugated board, according to the corrugated high score of a, B, C, e four categories, different corrugated board mechanical properties are also different. Type a corrugated board has the highest plane pressure and higher compressive strength, while type B has the opposite. Type C has better plane pressure, vertical pressure, parallel pressure and buffer force. The thickness between corrugated boards is the largest in type A, followed by type C, followed by type B, and type E is the smallest. Due to the easier processing and bending of paper board with small thickness, B-shaped corrugated paper is widely used for the compressive strength requirements of boxes According to the different mechanical properties of corrugated paperboard, it is better to use type A or C for single-sided corrugated box, type A, type B or type B and type C for double-sided corrugated box, and type B for those close to the outer surface, which can play an impact resistance role. A. Type B or combination of B and C can improve the physical and mechanical properties of cartons; from the perspective of printability, both type B and type C are conducive to printing.

⑵瓦拐纸箱的箱形在保证纸箱质量的前提下，应尽量节约纸箱加工材料和包装费用。比如.容积相同的纸箱，采用长：宽：高为2:1:2时省料，比例为1:1:1时费料。因此，应尽量避免采用正方形的箱.还要照顾到产品对箱容积的利用率，箱对卡车、火车车厢容积的利用率以及仓储运抽时堆垛的稳定性.

(2) under the premise of ensuring the quality of the carton, the processing materials and packaging costs of the corrugated box should be saved as much as possible. For example, the same volume of cartons, using the length: width: height of 2:1:2 is the most economical material, and the ratio of 1:1:1 is the most expensive. Therefore, we should avoid using square boxes as far as possible. We should also take into account the utilization rate of the product to the container volume, the utilization rate of the box to the volume of the truck and train carriage, and the stability of the stacking during the storage and pumping

据我所知重型瓦楞纸箱又分为单瓦，双瓦两种，双瓦楞有两层瓦楞纸，如:AB,bc,be等,而单瓦楞只有一层瓦楞，分:A,C,B,E,缓冲性依次递减,而挺度级平整度依次增加.双瓦楞的边压强度和耐破裂强度均高于单瓦楞.要求比较高的纸箱都采用双瓦楞纸箱。都是纸质的，原料为纯木浆和回收木浆，强度不同，造价也不同。

As far as I know, heavy-duty corrugated boxes are divided into single and double corrugated. Double corrugated boxes have two layers of corrugated paper, such as: AB, BC, be, etc., while single corrugated boxes have only one layer of corrugated paper, divided into a, C, B, e. the buffering capacity decreases in turn, while the stiffness level flatness increases in turn. The edge pressure strength and rupture strength of double corrugated boxes are higher than that of single corrugated boxes. They are all paper-based, and the raw materials are pure wood pulp and recycled wood pulp, with different strength and different cost.