Compressive Strength Calculation of Corrugated Carton and Test of Raw Paper

Corrugated boxes are made up of corrugated base paper at all levels. The compressive strength formula of corrugated boxes is to calculate the compressive strength of corrugated boxes according to the physical properties of the original paper. We can select certain corrugated base paper according to the compressive strength requirements of the pre-determined corrugated boxes. Only when we have a clear understanding of the various properties of base paper, can we combine and configure various types and specifications of paper according to the needs of production in the next step to produce products that meet the needs of users.

In fact, the compressive strength of corrugated cardboard boxes is a complex problem, because the boards and corrugated cardboard boards are anisotropic and uneven, and the fibre materials also have viscoelastic properties. In the process of making the boards, the boards are affected by different temperatures, adhesives and external forces. A lot of changes have taken place, so the changes from base paper to corrugated cardboard and to the physical properties of corrugated cardboard boxes are not directional. How to calculate the physical properties of cardboard and cardboard boxes from the physical properties of base paper has always been a topic of discussion in the research and manufacturing industry of carton machinery. In order to produce all kinds of carton products better, it is necessary for us to know some knowledge about performance testing of base paper.

Compressive Strength Calculation

There are many formulas for calculating the compressive strength, but most of them are used abroad. They are difficult to understand and remember. It is difficult for the existing corrugated carton designers in China to master. In the carton machinery enterprises, the difficulty of compressive design often separates the price design from the carton compressive strength design, which easily causes waste of raw materials or insufficient compressive quality problems. In the connection of design and production, the formula avoids blindness in design and increases the predictability of carton compressive strength at the beginning of production.

Corrugated boxes are made up of corrugated base paper at all levels. The formula of resistance is to calculate the compressive strength of the boxes according to the physical properties of the boards to see if they can meet the requirements. It can also select certain mechanical corrugated base paper according to the compressive strength requirements of the pre-determined corrugated boxes.

P = Px? KP - Compressive strength of empty box of corrugated carton (unit N).

Px-the transverse comprehensive ring compression strength of corrugated board base paper (unit N/cm).

Among them, the formula for calculating the comprehensive ring compressive strength of three-layer corrugated board base paper is as follows:

Px=(R1+R2+RmC)/15.2

The formula for calculating the comprehensive ring compressive strength of five-layer corrugated board base paper is as follows:

Px=(R1+R2+R3+Rm1C1+Rm2C2)/15.2

Rn - Test Force Value of Transverse Ring Compression Strength of Face Paper (N/0.152m)

Rmn - Test force value of transverse ring compression strength of corrugated paper (N/0.152m)

C - Corrugated shrinkage, that is, the ratio of the length of the corrugated core paper to the face paper. (CA = 1.532, CC = 1.477, CB = 1.361)

The effective value of K-comprehensive ring pressure in the compressive strength of empty cartons is calculated by the following formula:

K 3 A = 30.3 + 0.275Z-0.0005Z2

K3C=27.9+0.265Z-0.0005Z2

K 3B = 24.6 + 0.235Z-0.0005Z2

K5AA = 41.7 + 0.355Z-0.0005Z2

K5BB = 33.2 + 0.305Z-0.0005Z2

K5CC=38.1+0.345Z-0.0005Z2

K5AB = 38.2 + 0.335Z-0.0005Z2

K5AC = 40.2 + 0.355Z-0.0005Z2

K5BC = 35.7 + 0.325Z-0.0005Z2

Three A - three A corrugated box, three-layer box circumference range: 70-200 cm

Five AC - Five AC corrugated boxes, the value range of circumference of five-layer boxes: 70-300 cm

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