Corrugated cardboard box compressive strength test analysis
The compressive strength of a corrugated carton is the maximum load and the amount of deformation that occurs when the pressure tester uniformly applies dynamic pressure to the housing.
The compressive test process is divided into four stages: the first is the preloading stage to ensure that the carton is in contact with the press platen; the second is that the transverse pressure line is pressed down and the load is slightly increased at this time, and the deformation amount varies greatly; The third is the stage of pressure on the side wall of the carton. At this time, the load increases rapidly and the deformation increases slowly. Fourthly, when the carton is completely destroyed, it is the crushing point of the carton. Because in the entire pressure-bearing process of the carton, mainly the four corners are stressed, which accounts for about two-thirds of the total force, we should minimize the damage to the corrugations around the four corners of the carton during the production process.
The compressive strength of the carton is divided into effective and final values. The change of force during the compressive test is sometimes from slow to fast to the point of collapse, and some of it is gradually increased to the point of collapse. In the long-term compressive tests, we found that the change in the force value sometimes has a certain buffer: that is, when the force value and the deformation amount increase to a certain extent, the force value stops and the deformation amount continues to increase. After a period of time, the force value continues. Increase until the collapse of the carton. We can refer to the force value before buffering as the effective force value, and the deformation amount before buffering is called the effective deformation amount. After buffering, although the force value can continue to increase, but the carton has begun to deform, can not meet the requirements for use, so the standard for determining the compressive strength of the carton should be the effective value of the compressive test.
Generally, the deformation of the three-story A-case is below 10mm, the deformation of the three-story B-case is below 7mm, the deformation of the three-layer C-case is below 9mm, the deformation of the five-story BC is below 18mm, and the test force value should reach Effective compressive strength.
The better the quality of the carton, the higher the effective value of the compressive strength, and the smaller the deviation between the effective value and the final value. Analysis of the compressive strength of corrugated boxes is generally expressed by the average value of a set of multiple experiments (â‰¥3). The smaller the deviation between each experimental data, the more stable the compression resistance of the carton. We can further analyze the quality of the carton through the process of changes in force and deformation, combined with various factors affecting the carton pressure resistance.
(to be continued)
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