[Abstract] In this paper, the problems of bending and indentation of honeycomb paperboard are analyzed. Using the method and knowledge of engineering mechanics, the theory of indentation and bending of honeycomb paperboard is solved by using the principle of out-of-regulation and collapse. In this way, the key technology of the honeycomb cardboard box moulding and boxing process is solved, and the honeycomb cardboard box can also be molded and used for high-efficiency automated production like a corrugated cardboard box.
Key words: instability; crush; honeycomb cardboard; bending; indentation
Honeycomb paperboard can be used to manufacture high-strength carton. Honeycomb paperboard box has the advantages of high strength, light weight, good cushioning performance, etc. It can be used to manufacture high-strength carton, widely replace middle and small wooden boxes and corrugated cardboard boxes with more than five layers, and has a wide range of applications. prospect. At present, the production of honeycomb cardboard boxes mainly adopts manual box-making processes such as paste box method and frame method. The honeycomb paperboard is first cut into blocks of panel materials and then docked into boxes. The production efficiency is low, the quality is poor, and the cost is high. When it is bulky and difficult to transport, it severely restricts the application of honeycomb cardboard boxes. The reason why honeycomb cardboard boxes have not been produced with high efficiency in the moulding method is that the problem of indentation and bending of honeycomb paperboard has not yet been solved.
1 Difficulties in crumpled indentation of honeycomb paperboard
The honeycomb paperboard is a composite structure sandwiching a honeycomb paper core between two layers of paper. The paper core sandwich is usually a honeycomb-shaped regular hexagon structure and has a good stability, as shown in FIG. 1 .
The edges of the honeycomb core are adhesively bonded when wound. When the shaft or y-axis bends, the adhesive surface of the honeycomb core will be subjected to tensile stress and tear damage. Due to the anisotropy and unevenness "1-3" of the bending strength of the honeycomb core, it is relatively easy to bend around the x-axis than to bend around the y-axis when it is bent. In addition, the bending marks generally follow the edges of the honeycomb core. Extend the edge, not the straight line. Therefore, the honeycomb paperboard cannot be bent directly.
When vertical pressure is applied to the honeycomb paperboard to indent, the edges of the honeycomb core will be outwardly bent, which will eventually cause the adhesive edge of the cellular core edge of the pressed area to open and collapse, as shown in FIG. 2 . The indentation area is too weak to be used. If the applied pressure does not collapse into the honeycomb core in the indentation region, only a certain degree of plastic deformation is formed, and an indentation is formed on the surface, but the remaining portion is still a hexagonal honeycomb structure and still cannot be bent.
(to be continued)
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