What is the compressive strength of corrugated boxes? Analysis of compressive strength of corrugated boxes.

The compressive strength of the carton refers to the larger load and deformation amount when the dynamic pressure is evenly applied by the pressure testing machine to the damage of the box.

The method of testing the compressive strength of corrugated boxes is to close the box three-dimensionally, seal it up and down with sealing tape, put it in the middle of the lower platen of the corrugated box pressure tester, start the machine so that the upper platen is close to the empty box, then Start the standard speed of pressing until the carton is crushed, and read the measured value, which is the compressive strength of the carton.

The compression test process is divided into four stages: one is the preloading stage to ensure that the carton is in contact with the pressure plate of the anti-compression machine; the second is the stage when the horizontal pressing line is pressed down, at which time the load increases slightly and the deformation changes greatly; the third is In the compression stage of the side wall of the carton, the load increases rapidly and the deformation increases slowly; fourth, when the carton is completely destroyed, it is the crushing point of the carton.

There are many formulas for calculating the compressive strength of corrugated boxes:

Commonly used are K.Q.Kellicutt formula, Martin Holt (Maltenfort) formula, Wolf (Wolf) formula, Makey (Makee) formula, Australian APM company calculation formula, and so on.

Factors Affecting Compressive Strength

1. The ring compressive strength of the paper is the key to ensure the compressive strength of the carton, but other physical properties of the paper cannot be ignored.

When the tensile strength of paper, especially corrugated paper is not enough, the strength and deformation of the carton will increase steadily during the compressive test. The final Z value is very high and the effective force is very low. Happening. The waterproof performance of paper is also very important, especially the refrigerated box has higher requirements for the waterproof performance of paper. Sometimes although the compressive strength of the carton is very high, because the paper is not waterproof, the carton is easy to absorb moisture when stored in the cold storage, causing the collapse of the warehouse. .

2. The influence of moisture on the compressive strength of cartons cannot be ignored.

The waterproof performance of paper and cardboard is also very important. Sometimes although the compressive strength of the carton is very high, because the paper is not waterproof, it is easy to get damp, causing the collapse of the warehouse.

3. The production process of the carton also affects the compressive strength.

The production process of the carton also affects the compressive strength. If the pressure line is too wide, the force value of the carton will increase slowly during the compression test, the effective force value will be small, and the final deformation will be large.

4. It is also critical to choose the appropriate corrugated type according to the carton type.

In people's consciousness, it is often believed that the larger the corrugated shape, the higher the compressive strength of the carton, and it is easy to ignore the influence of the corrugated shape on the deformation. The larger the flute type, the greater the compressive strength of the carton and the greater the deformation; the smaller the flute type, the smaller the compressive strength of the carton and the smaller the deformation. If the carton is too large, but the corrugated shape is small, the carton will be easily crushed during the compression test; if the carton is too small, the corrugated shape is large, the deformation will be too large during the compression test, and the buffering process will be long and effective. The deviation between the force value and the Z final force value is too large.

5. The carton is composed of various layers of paper, and the reasonable collocation of the paper is the basic condition to ensure the compressive strength of the carton.