Calculation method for compressive strength of the

2022-08-05
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How to calculate the compressive strength of corrugated boxes

II. How to calculate the compressive strength of corrugated boxes

finding out the rules between the structural process of corrugated boxes and the compressive strength of corrugated boxes has always been one of the important topics that the majority of colleagues in the corrugated industry are committed to studying. Corrugated packaging has a long history in Europe and the United States. Foreign counterparts have also made achievements in the study of compressive strength, and summarized some empirical formulas for calculating compressive strength. Among them, the more popular ones are:

■ the Kelly Carter formula for calculating the compressive strength of cartons according to the ring compressive strength of corrugated paper base paper,

■ the martenfoit formula for calculating the compressive strength according to the transverse congolat flat compressive strength of corrugated paper inside and outside:

■ the edge compressive strength and thickness of corrugated paper are taken as the parameters of corrugated paper, and Wolf formula for calculating the compressive strength of corrugated boxes with the length width ratio and height as the factors of the sign structure:

■ Markey formula that takes the edge compressive strength and stiffness of the paperboard as the main factors affecting the strength of corrugated boxes and believes that the compressive strength of the cartons changes with the square root of the perimeter of the cartons: (makee)

among them, Carey Carter formula is the most respected by domestic peers. It is mostly used as the calculation formula in the articles on compression resistance of cartons published in domestic professional magazines. However, it has been proved by practice that the accuracy of calculating the compressive strength of cartons by Carey Carter formula is low, and the calculation method is complex and difficult to master

through the analysis of a large number of data, the author has summarized a set of methods to accurately calculate the compressive strength, and the accuracy can reach more than 90% through practice. This method mainly calculates the initial value of the carton compressive strength according to the compressive strength calculation formula, and modifies the calculated result of the formula in combination with the carton structure process to obtain the final calculation result

1 and the carton compressive strength calculation process <3 After the installation and commissioning of the equipment/p>

to accurately calculate the compressive strength of the carton, first measure the perimeter of the carton, the thickness of the carton and the edge compressive strength of the carton, and correct the calculated value in combination with the carton structure tensile machine process. The edge pressing strength can be calculated according to the transverse ring pressing strength of the base paper of each layer of corrugated cardboard and the cardboard pit type. For factories without testing instruments, the compressive strength of cartons can be calculated as long as the ring pressure strength or ring pressure index of base paper is known. It must be pointed out that the ring pressure value of the base paper must be objective and true, and the ring pressure strength of the base paper must be the test value under the temperature and humidity environment of 23 ℃± 1 ℃ and 52% RH

the calculation process of carton compressive strength is shown in Figure 6

2. Formula for calculating the compressive strength of cartons

through the verification of a large number of test data, we found that the results calculated by the following formula are close to the real value, and the calculation is simple and easy to master. Here we recommend to you:

for example:

an ordinary slotted carton with a specification of 360mm x 325mm x195mm. The pit shape is C, the cardboard thickness is 3.6mm, and the edge compression strength is 4270n/m. It is estimated that the compressive strength of the whole carton will be 123million yuan from 2011

problem solution:

it can be seen that the perimeter of the carton is 1.37M, the thickness of the cardboard knife is 3.6mm, and the edge pressing strength is 4270 n/m

according to the formula:

(to be continued)

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