First of all, let us know what the compressive strength of the carton refers to: the compressive strength of the corrugated box refers to the maximum load and deformation of the box under the dynamic pressure applied by the pressure tester. For customers who need to customize the carton, whether the compressive strength of the carton is passed or not means that the customized carton can protect the product to be packaged. Therefore, it is very important to judge the compressive strength of the carton. Let us know how to determine the compressive strength of the carton!
Under normal circumstances, the compression test process of the carton can be divided into four stages: first: it is to ensure that the carton is in contact with the pressure plate of the anti-pressing machine during the pre-loading phase; the second is that the load is slightly increased when the transverse pressure line is depressed. The amount of deformation varies greatly; the third is that the load on the sidewall of the carton is increased at this time, and the amount of deformation is increased slowly; the fourth is that the carton is the crush point of the carton when it is completely destroyed. Therefore, it is determined that the compressive strength of the carton is up to standard in accordance with the above four steps to finally obtain the compression data of the carton.
The factors affecting the compressive strength of the carton can be divided into the following points:
1. Since the carton is composed of paper of all levels, the reasonable matching of the paper between the layers is the most basic condition for ensuring the compressive strength of the carton. Then through the test of the physical properties of the paper at each level, we can preliminarily calculate the compressive strength of the carton to obtain the compressive strength of the carton, so that the compressive strength of the carton can be controlled for each process in the production process.
2. The next step is the ring strength of the paper. This is also the key to ensuring the compressive strength of the carton. At the same time, other physical properties of the paper cannot be ignored. If the tensile strength of the paper is not enough, then the force value and deformation of the carton will be smoothly increased in the compression test. Although the final value is very high, the effective value is very low, and the deformation after the test of the box is There will be an accordion-like situation.
3. Everyone knows that the production process of the carton will also have an impact on the compressive strength. Through the test, it is found that under the same conditions: when the transverse pressure line of the carton is widened by 1 mm, the compressive strength of the carton is reduced by 90 nm to 130 n, and the deformation amount is increased by about 2 mm. If the pressure line is too wide, the force value of the carton will increase slowly during the compression test, so that the effective force value is small and the final deformation amount is large. Therefore, in order to ensure the compression strength of the carton, we should try to improve the production process to reduce the impact of each process on the compressive strength of the carton.
4. When choosing the carton type, we should choose the appropriate type of flute: In people's consciousness, it is often considered that the larger the flute type is, the higher the compressive strength of the carton is, then the effect of flute type on the deformation is easy to ignore. Case. The larger the flute type, the greater the compressive strength of the carton, and the greater the amount of deformation; the smaller the flute type, the smaller the compressive strength of the carton, and the smaller the amount of deformation. If the carton is too large but the size of the carton is small, then the carton is easily crushed during the compression test; if the carton is too small but the clamshell type is large, the deformation test will cause excessive deformation and the buffer process will be effective. The force value is too far from the final force value.
5. The influence of moisture on the compressive strength of the carton is also very large. In the production environment, use environment, storage environment, weather and other factors of the carton, the water content of the carton will be affected. Therefore, in order to ensure the compressive strength of the carton, attention should be paid to the external The impact of the environment on the moisture content of the carton.
