Study on the structure and properties of seven-layer corrugated paper

In recent years, seven-layer corrugated paperboard has been widely used in the heavy-duty packaging field for its excellent protection performance and low price, especially for the export of heavy-duty and large-scale commodity packaging, and most of them use seven-layer corrugated cartons from recent years. The development trend shows that the scope of application is still expanding.
Because there are three layers of corrugated paper in the seven-layer corrugated paperboard, different types and shapes of corrugated corrugated paper can be used for different core papers. Due to different types and shapes of corrugated corrugated sheets, their performance is also very different, and each has its own advantages and disadvantages. The performance of the seven-layer corrugated cardboard made of corrugated board will also be obviously different. The structure of the seven-layer corrugated board has a great influence on its performance and various technical indicators, thus determining the application range of the seven-layer corrugated board. This article focuses on the study of the combination of various types of corrugated fiber cores (ie, the structure of a seven-layer corrugated paperboard) and the effects of the seven-layer corrugated paperboard on compressive and bursting resistance. (a) The performance of each type of corrugated board <br><br><br><br><br> The corrugated type is the basic element of the corrugated board. There are three types of corrugated corrugated board: U-shaped, V-shaped and UV-type. The cartons made of the U-shaped corrugated board have good elasticity and comfortable feel. High absorption capacity, good cushioning performance, but low compressive strength. V-type helium has higher pressure resistance, but it is easy to break and loses buffering performance. UV type is U and V type complementary type, and it is widely used.
According to the 楞 type of high and 30cm long corrugated board in the number of turns can be divided into A, B, C, E four kinds of corrugated, its main properties are shown in Table 1, from Table 1 that: A type of rake is high and corrugated Width, a small number of turns per unit length, so the performance of vertical pressure is better, and shock-proof buffering performance is good, and B-type crucible and A-type crucible exactly the opposite, a unit length of more than the number of corrugated, then its flat compressive strength, However, the cushioning performance is somewhat poorer. The C-window is between A and B, which combines the characteristics of the A-type and B-type corrugations, but not their average value. The E-lay is generally used for inner packing or cartoning, and generally not suitable for outer packaging. The following is a study of the effect of the combination of three types of corrugated fiberboards, A, B, and C, on the performance of a seven-layer corrugated paperboard.
Schedule 1 Varieties and their main properties (B) The effect of the structure of the corrugated board on its performance <br> Since the performance of different types of corrugated board is also different, the performance of the seven-layer corrugated board composed of different types of corrugated board is also very different. It can be seen from Figure 1 that in a seven-layer corrugated cardboard made of a pure type of corrugated board, a seven-layer corrugated paperboard consisting of a type A corrugated board has the highest burst strength, but its compressive strength is minimal, but simple. The seven-layer corrugated cardboard made of Type B 楞 has the highest edge pressure strength, but its burst resistance is lower. As can be seen from the results of Fig. 2, the seven-layer corrugated cardboard consisting of A, B, and C corrugated cardboards has similar resistance to puncture strength. Although the compressive strength of a seven-layer corrugated cardboard box consisting of B-type corrugated cardboard boxes is lower than that of A and C types, To be high, but its disadvantage is poor burst resistance, and at the same time whether its compressive strength reaches its maximum value, which needs to be further studied.
In order to absorb the advantages of each type of stencil and obtain a good overall performance of the cardboard, so the use of three types of A, B, C corrugated into seven types of corrugated corrugated cardboard. The results in Fig. 3 show that in the seven-layer corrugated paperboard, the seven-layer corrugated board made of ABB and AAB corrugated board has a lower burst resistance than the board made of A-type corrugated sheet but its edge pressure is reduced. The intensity increased significantly and its overall performance increased. The performance of seven-layer corrugated cardboard, also consisting of A- and C-type corrugations, is not improved compared to AAA (see Figure 4). This may be due to the fact that C-type corrugated sheets do not have outstanding performance in one of their aspects.
The above research results show that the combination of AAB and ABB type rakes has good burst strength and side pressure strength. At the same time, as can be seen from Figure 5, the puncture strength of the seven-layer corrugated cardboard composed of the combination of AAB and ABB pods can be seen. Significant improvements have been made, especially for ABB type corrugated board and cartons. Not only is the cardboard box's resistance to over-strength is optimum, but its resistance to puncture is also optimal. The seven-layer corrugated box with the highest compressive strength in the seven-layer corrugated carton composed of a single type of corrugated board has greatly improved the compressive strength and puncture resistance. Has a good overall performance. (III) Conclusions 1. The performance of a single-layer seven-layer corrugated paperboard consisting of A, B, and C is quite prominent, but its overall performance is poor.
2. The seven-layer corrugated paperboard formed by the combination of different types of corrugated board can fully absorb the advantages of various types of corrugated board, and its comprehensive performance is greatly improved.
3. Based on the results of the study, the seven-layer corrugated paperboard and cartons constructed with the combination of ABB type corrugated linings not only have the best compressive properties, but also have the best resistance to puncture strength, and have good overall performance indicators.
Wen Zhang Qinfa Zeng Renxia