The liner punching characteristics of the most pop

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The liner punching characteristics of corrugated paperboard

1 the structural form of commonly used corrugated paperboard liner

during the circulation process of loading, unloading, transportation, storage, etc., 5 the experimental machine should have nameplate and signs or signs such as abetting lubrication, manipulation, safety, etc., which are often affected by external impact, vibration, pressure and other factors. In order to effectively protect goods from damage, products need to be cushioned and shockproof packaged. In transportation packaging, using paper pads instead of foamed plastics as cushioning materials is not only conducive to environmental protection, but also can be recycled and recycled to reduce costs. Corrugated cardboard liner can not only block the products in the container, but also absorb energy when the products are impacted by the outside world, prolong the action time of the inner products to withstand the impact pulse, and has good cushioning performance

for different product types and shape characteristics, reasonable cushioning materials and structural forms should be selected to ensure the best cushioning effect. Common corrugated board liner structures include elastic type, folding type, elastic folding type and angle type

2 cushioning performance of corrugated cardboard liner

reasonable cushioning and shockproof packaging of products is the key to ensure that products are not damaged in the process of circulation; The selection of cushioning materials and the determination of liner structure and size are the main contents of cushioning packaging design. The static compression test, impact test and vibration characteristic test are carried out on the cushioning materials, and the mechanical characteristics of different cushion structures are tested and analyzed, so as to provide a theoretical basis for the design of cushioning cushion. For example, under the action of compression load, the compression amount of corrugated cardboard liner is measured, the load deformation curve is given, and the bearing capacity and elastic constant of the liner are determined; Under the impact load, the dynamic performance of the liner is tested and the acceleration static stress curve is drawn

the purpose of impact test is to understand the cushioning performance of the liner and determine the impact load on the internal products. In the past, it was necessary to deposit the film very thick and the related peak acceleration, velocity change and impact action time. The impact characteristics of typical corrugated cardboard liner are tested on MTS impact testing machine, and the transmission characteristics of the liner under the drop height are analyzed to determine the thickness and bearing area of the liner used

the cushioning effect of corrugated board can be described by peak acceleration (g), velocity change (△) and impact action time (T):

△ = iogdt

the smaller the velocity change △ is, it also plays an important role in the plastic processing industry, indicating that the better the cushioning effect of corrugated board is; When the velocity change △ is constant, the longer the impact time t is, the smaller the peak acceleration g is

the impact acceleration of the test is 150g, and the corrugated board sample is BC type. If the lateral elastic structure buffer liner is used, the maximum peak acceleration measured is 58G, and the impact action time is 7.8ms; When a buffer window is opened in the middle of the lateral elastic folding cushion, the measured maximum peak acceleration is only half of the original structure, the impact time is twice that of the original structure, and the deformation of the cushion is more than three times that of the original structure, indicating that the lateral elastic folding structure with buffer window has high recovery energy

if the cushion liner with parallel elastic folding structure is used, although it has good cushioning characteristics, it is easy to produce resonance at a small natural frequency. The company accounted for 31.7% of the total market in 2011, causing damage to the unpressurized corrugated board during two impacts. Therefore, this kind of liner is often used as a force pad to protect the interior products from horizontal impact

from the test results, it can be seen that the cushioning performance of pad structures (E) and (f) is lower than that of pad structures (b) and (c)

3 comparison of cushioning performance

the packaging simulator is buffered and packaged. The outer packaging container and buffer liner are made of double-sided C-type single corrugated board. The gram weight of face paper and corrugated core paper are 205g/m2 and 127g/m2 respectively. They are bonded with water-resistant adhesive, and the bursting resistance of corrugated board is 1379kpa. Conduct temperature and humidity pre-treatment on the test samples as required, and record the temperature and humidity of the test site

on the drop test machine, the free plane drop test is carried out on the package simulator from the height of 610mm, and three repeated tests are carried out on each package size, weight and liner combination. During the test, the acceleration time recorded by the varistor accelerometer placed at the center of gravity of the packaging analog is converted into a digital quantity, stored and recorded on the disk, and the data is processed by the computer to obtain a smooth impact acceleration time curve, from which the relationship curve between the peak acceleration and static stress is derived. Now take the packaging analog with a size of 179mm 179mm 179mm as an example, Explain the cushioning performance when using different cushion structures

the elastic liner is formed by cutting the paper surface on the corrugated board and then folding back. Its static stress is the weight of the packaged product divided by the actual contact area between the product and the liner. During the test, the impact acceleration and time of the packaged product when the structural liner (all sizes are 179mm and 180mm) are measured respectively. It can be seen from the curve that with the increase of pad thickness, the peak acceleration of wave trough decreases and the static stress increases, indicating that the bending times of elastic pad increase and the cushioning effect also increases

the folding liner is composed of a cardboard surface and a cylinder unit with non bearing space. Its static stress is the weight of the packaged product divided by the total top area of the folding liner. During the test, the impact acceleration and time of the packaged product when the structural liner (size 170mm, 179mm, 35mm) is measured respectively

The curve of

shows that for folded liners with the same size but different structures, their bearing capacity (cushioning performance) depends on the number and location of the columns of the liner. Generally speaking, the stiffness of the pad plane increases with the reduction of the size. Therefore, for the same pad structure, the smaller pad size can adapt to the higher static stress load

the type of liner structure should be selected according to the brittleness of the product. In general, in order to give full play to the cushioning capacity of the gasket, for low load (lighter product), elastic gasket should be selected; For high loads (heavy products), folding gaskets should be selected

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