The carton requires a certain compressive strength because the carton stacked in the lowest layer is subjected to the pressure of the upper carton during the storage and transportation process. In order not to collapse, it must have a suitable compressive strength and the pressure resistance of the carton. The intensity is calculated using the following formula: P=KW P----carton compressive strength, N W----Carton weight after loading, N n----stack layer number K----stacking code safety factor The number of stacking layers n is obtained from the stack height H and a single carton height h, n=H/h The stacking code safety factor is determined according to the number of layers of the stacking code. The national standard specifies: Storage period less than 30d, take K=1.6 Storage period 30d-100d take K=1.65 Storage period is greater than 100d, take K=2.0 2. Calculate the compressive strength of the carton according to the raw materials. After the carton compressive strength is scheduled, the appropriate carton board and corrugated paper should be selected to produce the corrugated box to avoid waste caused by blind production; There are many formulas for calculating the compressive strength of a carton based on the ring crush strength of the base paper, but the more concise and practical is the kellicutt formula, which is suitable for estimating the compressive strength of the 0201 type carton. 3. Method for determining the compressive strength of the carton Due to various factors in the production process, the compressive strength of the carton produced by the raw materials is not necessarily consistent with the estimation result. Therefore, the final method for accurately determining the compressive strength of the corrugated box is to compress the carton after the temperature is wetted. Test machine test; for small and medium-sized factories without test equipment, a wooden board can be placed on the carton, and then an equal amount of heavy objects are piled on the wooden board to roughly determine whether the compressive strength of the carton meets the requirements; Through experiments, it is concluded that under the same conditions, the transverse pressure line of the carton is increased by 1 mm, the compressive strength of the carton is reduced by 90N to 130N, 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, the effective force value is small, and the final deformation amount is large. In order to ensure the compressive strength, we should try our best to improve the production process and reduce the impact of each process on the compressive strength of the carton. If the carton is subjected to die-cutting, the corrugation of the carton will be damaged to varying degrees due to external heavy pressure, and the compressive strength will also decrease. In comparison, the flat die cutting has less influence on the compressive strength, and the circular pressing and the circular flat die cutting are larger against the pressure shadow II. In order to seal the cover of the carton well, in the die-cutting process, if the high-low pressure wire processing is performed, the compressive strength of the carton is reduced by 10% to 20%. The method to prevent the reduction is usually to add a bar line under the high and low line or a thick line with a thick line.
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