Measurement of Bending Stiffness of Corrugated Board

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UDС

676.274

DOI:

DOI: 10.17238/issn0536-1036.2016.1.155

Abstract

The corrugated boxes are a very common type of packaging. The standard and additional features of corrugated board, primarily the bending stiffness are used in order to predict their behavior under operating conditions. The 4-point method is more valid of all the methods of measuring the bending stiffness of corrugated board. The information on the use of it is cur-rently insufficient. The paper presents a method of measuring the stiffness of corrugated board with the 4-point bending mode on the device “L&W 4-point Bending Stiffness Tester SE 108”. The analysis of the factors affecting on the test results is carried out on the samples of C-flute single-wall corrugated board of different brands of T22 to T25. The influence of the sample length within the range from 100...200 mm and a loaded weight in the range from 70...220 grams is studied. The advantage of acceptance as a result of the geometric mean of bending stiffness, measured in the machine (MD) and cross machine (CD) direc-tions is shown. It is established experimentally that the increasing the length of the sample and the applied load decreased bending stiffness of corrugated board. The greatest impact of the sample length affects at the low values of the applied load and the effect of the applied load – at a small length of the sample. It is found that the anisotropy of bending stiffness of corrugated board of the low grade T22 (2.7...3.1) was higher than that of the high grade T25 (2.5...2.7). The anisotropy of bending stiffness decreases with the increasing of the sample length. For the accurate and reliable measurement the length of the test sample of corrugated board should be at least 200 mm, as in this case the influence of other factors almost has no effect. The magnitude of the applied load depends on the brand of corrugated board and should be within the range from 120...220 grams. The results can improve the accuracy of the assessment of corrugated board quality and provide a more reliable prediction of the properties of the corrugated boxes.

Authors

E.Yu. Larina, Candidate of Engineering Ya.V. Kazakov, Candidate of Engineering

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; е-mail: ketrin@bk.ru, j.kazakov@narfu.ru

Keywords

corrugated board, bending, bending resistance, bending stiffness.

References

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Received on May 13, 2015