Calculation of compressive strength of carton compressive tester and test of base paper
Corrugated box compressive strength calculation and base paper test
The corrugated box is made of corrugated base paper at various levels. The compressive formula of the corrugated box is to calculate the compressive strength of the corrugated box according to the physical properties of the cardboard base paper. We can choose a certain base paper of corrugated cardboard according to the predetermined compressive strength requirements of the corrugated box . Only by clearly understanding the various properties of the base paper, in the next step, according to the needs of production, can the paper be combined and configured with various types and specifications to produce products that meet the needs of users.
In fact, the compressive strength of corrugated boxes is a more complicated problem, because the base paper and corrugated base paper that make up the corrugated cardboard are anisotropic and uneven, and the fiber material also has viscoelastic properties. In the process of board, the base paper is subjected to different temperatures, adhesives and external forces, and many changes have taken place on its own. Therefore, the changes from the base paper to the corrugated cardboard and the physical properties of the corrugated box are not directional. Calculation of physical properties of base paper The physical properties of cardboard and cartons have been the subject of discussion in the carton research and manufacturing industry. In order to better produce all kinds of carton products, it is necessary for us to understand some knowledge of the performance testing of base paper.
Calculation of compressive strength
There are many formulas for calculating the compressive strength, but most of them are used abroad, which is not easy to understand and remember. It is difficult for the designers of corrugated cardboard boxes in China to master them. Among the enterprises, due to the difficulty of compressive design, the price design is often separated from the compressive strength design of the carton, which is easy to cause waste of raw materials or quality problems of insufficient compressive strength. In the connection between design and production, Kang's formula avoids the blindness in design and increases the predictability of the carton compressive strength at the beginning of production.
The corrugated box is composed of corrugated base paper at various levels. The Kang's formula is to calculate the compressive strength of the carton according to the physical properties of the cardboard base paper to see if it can meet the requirements; you can also choose a certain according to the predetermined compressive strength requirements Corrugated cardboard base paper.
P = Px · KP—the empty box compressive strength of corrugated box (unit N),
Px—Comprehensive horizontal compressive strength of corrugated cardboard base paper (unit N / cm).
Among them, the calculation formula of the comprehensive ring compression strength of the three-layer corrugated cardboard base paper is:
Px = (R1 + R2 + RmC) /15.2
The calculation formula of the comprehensive ring compression strength of the five-layer corrugated cardboard base paper is:
Px = (R1 + R2 + R3 + Rm1C1 + Rm2C2) /15.2
Rn --- Testing force value of lateral ring compressive strength of facial paper (N / 0.152m)
Rmn --- Testing force value of transverse compressive strength of corrugated paper (N / 0.152m)
C --- Corrugation shrinkage, that is, the ratio of the length of corrugated core paper to facial paper. (CA = 1.532, CC = 1.477, CB = 1.361)
K—The effective value of the comprehensive ring pressure in the compressive strength of the empty carton. The calculation formula is:
K3A = 30.3 + 0.275Z-0.0005Z2
K3C = 27.9 + 0.265Z-0.0005Z2
K3B = 24.6 + 0.235Z-0.0005Z2
K five AA = 41.7 + 0.355Z-0.0005Z2
K five BB = 33.2 + 0.305Z-0.0005Z2
K five CC = 38.1 + 0.345Z-0.0005Z2
K 五 AB = 38.2 + 0.335Z-0.0005Z2
K five AC = 40.2 + 0.355Z-0.0005Z2
K five BC = 35.7 + 0.325Z-0.0005Z2
Three A --- three-layer A corrugated box, the value range of the three-layer box perimeter: 70-200cm
Five AC --- five-layer AC corrugated box, the range of the value of the five-layer box perimeter: 70-300cm
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