Application and Characteristics of AB Double Corrugated Paperboard in Cushion Packaging

The extensive use of AB double corrugated cardboard in cushioned packaging continues to push people to conduct further research. In this paper, the impact and vibration characteristics of double-stacked AB double corrugated paperboard are experimentally studied. The maximum acceleration of double-stacked AB double corrugated paperboard is presented. The static stress curve and its characteristic coefficient, empirical formula, and maximum acceleration-time curve are given. And vibration transmission rate - frequency curve; and AB type double corrugated cardboard and foamed polyurethane foam, honeycomb cardboard for its application in buffer packaging were discussed.

1, test samples and their pretreatment

The test material was selected from the type AB double corrugated cardboard supplied by Northwest Carton Factory, and its material was (300/180.4,/180/180B/300)g/m2. All samples were pretreated before the test. The temperature and humidity of the test environment were T=20°C and RH=64%, respectively. In the test process, the double-layered double-corrugated cardboard of type AB was used, so the actual thickness was 13.44 cm. Test the maximum acceleration-static stress curve of AB double corrugated cardboard according to GB8167-87 "dynamic cushioning test method for packaging cushioning materials"; test type AB according to GB4857.10-86 "Test method for sinusoidal vibration of packaging cushioning material (frequency conversion)" Double corrugated board vibration transmission rate - frequency curve.

2. Analysis of Impact Absorption Characteristics of Double Stacked AB Double Corrugated Paperboard

(1) Dynamic test data and maximum acceleration - time curve

The dynamic compression test data is shown in Table 1. Figure 1 and Figure 2 show the typical maximum acceleration-time curve obtained by double-stacking AB-type double corrugated cardboard at two drop heights of 40cm and 60cm. The shock waveform is similar to the half-sine waveform; when the drop height is From 40cm to 60cm, the maximum impact acceleration of the AB double corrugated board increases, and the impact time increases.

According to the principle of least squares, using Matlab software to fit the dynamic compression test data, the empirical formula of the maximum acceleration-static stress curve and the maximum acceleration-static stress curve were obtained.

Figure 3 is the maximum acceleration of the double-stacked AB double corrugated cardboard at drop heights of 40cm and 60cm - static stress curves. Obviously, the double-stacked AB double corrugated board's maximum acceleration - the static stress curve is concave valley-shaped, opening up, there is only one extreme point. From the curves, it can be seen that double-stacked AB double corrugated cardboard shows good cushioning performance under low impact loads; with the increase of the drop height, the maximum acceleration corresponding to the same static stress conditions increases.


Double-stacked AB double corrugated board variable frequency vibration test data shown in Table 2. Analysing the vibration test data of AB double corrugated cardboard, we can see that the vibration transmission rate curve of double-stacked AB double corrugated cardboard generally has multiple resonance frequency points, ie, it has multi-modality, and the corresponding transmission rate of these resonance points is obvious. The difference is that there is a distinction between primary and secondary. The resonance point with the highest vibration transmissibility is defined as the main resonance point (or first resonance point), and the others are respectively called the second resonance point, the third resonance point, and so on. Because of its multi-modal vibration, it is necessary to avoid the main resonance frequency range when using double-stacked AB double corrugated cardboard for buffer packaging design to avoid excessive impact on the packaging products. It can also be seen from the vibration transmissibility curve of the double-stacked AB double corrugated paperboard that the transmission rate at the high-frequency excitation is very small, so the AB-type double corrugated paperboard has significant attenuation of the high-frequency vibration.

3, AB double corrugated cardboard and several commonly used buffer material comparison

(1) Comparison of AB Double Corrugated Paperboard and Foamed Polyurethane Foam

Foamed polyurethane foam has good wear resistance, excellent low temperature resistance, oil resistance, chemical resistance, and other properties. As a cushioning material, when the external force is small, it exhibits linear elasticity and plays a good role in protecting the contents. When the external force is large, it shows non-linear elasticity. At this time, the amount of deformation of the foamed polyurethane foam is large and absorbed. With high impact energy, foamed polyurethane foam has good cushioning properties compared to AB double corrugated paperboard, but it cannot be recycled and is classified as "white pollution"; while AB type double corrugated cardboard is easy to recycle and reuse. Treatment is a typical green packaging material. Fig. 5 is the maximum acceleration-static stress curve of double-stacked AB double corrugated cardboard with foamed polyurethane foam (ρ=0.032 g/cm3) at the same drop height (DH = 60 cm).

(2)Comparison of performance of AB double corrugated cardboard and honeycomb paperboard

Honeycomb paperboard has high strength and rigidity, less consumables, light weight, uniform compression, high pressure resistance, bending resistance, high shear strength, good anti-vibration and sound insulation properties, and honeycomb paperboard is beneficial to recycling. The ideal new packaging material is similar to the AB double corrugated cardboard. However, the production efficiency of the honeycomb paperboard production equipment is much lower than that of the AB double corrugated paperboard, and the production process is not as mature as the AB type double corrugated paperboard. In terms of applications, honeycomb paperboard is only suitable for large-scale instruments, electronic computers, furniture, glass products, and various types of disposable cushioning materials. The AB double corrugated cardboard is suitable for food, fruits, vegetables, small household appliances, hardware, industrial devices, stationery and other light industrial and agricultural products. Fig. 6 is the maximum acceleration-static stress curve of double-stacked AB double corrugated paperboard and different thickness honeycomb paperboard under the same drop height (DH=40cm).

The application of AB Double Corrugated Paperboard has another advantage. The corrugated paperboard liner can be used in the corrugated box production process to produce scraps or corners, and can be made into various shapes of cushioning pads after die-cutting and bonding. , has a certain degree of economic benefits. However, there are certain limitations. The thickness of the AB double corrugated cardboard liner can only be changed by changing the number of layers, and the choice of the thickness of the foam liner and the honeycomb paperboard is relatively flexible. The thickness of the honeycomb paper core determines the thickness of the honeycomb paperboard, and can be made into thickness of 5mm, 8mm, 10mm, 15mm, 20-100mm; the foam cushion can select its thickness according to the actual situation without affecting the buffering effect.

By testing the maximum acceleration-static stress curve of double-stacked AB double corrugated cardboard at different drop heights, and using the least square method to fit the double-stacked AB double corrugated board's maximum acceleration-static stress curve, The empirical formula discusses the application of AB double corrugated cardboard in cushioning and anti-vibration packaging. Experimental studies have shown that the type AB double corrugated paperboard has a long impact time, high impact energy, and good dynamic cushioning characteristics when the impact load is small. It has a large advantage in transport packaging and is an ideal cushioning packaging material. However, in application, it must be noted that from the buffering point of view, AB double corrugated cardboard should be based on the actual size and quality of the contents to select the optimal design. (Guo Yanfeng, Fo Yungang, Luo Guanglin)