Experimental research of deformation properties of cardboard and corrugated cardboard during their creasing

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Shustykevych A. I., Kolomiiets A. B., Vatuliak Yu. V., Котовський О. О. № 2 (82) 21-28 Image Image

Cardboard and corrugated cardboard that meet international standards are used to make cardboard packaging. Physical and mechanical characteristics of the materials affect their deformation properties and, accordingly, the product quality.

An analysis of well-known European theoretical and experimental studies of the physical and mechanical properties of cardboard materials has revealed that they do not cover all cardboard distributed in Ukraine. Especially important for the technological process is the stability of the dimensions after the application of creasing lines on the cardboard or corrugated cardboard blanks. The necessity of experimental research to determine the optimal depth of cardboard creasing after relaxation is substantiated.

The stand for research is described. For experimental studies, various cardboards with a thickness of 0.36 to 1.0 mm and three-layer corrugated cardboard types E, B, C with a thickness of 1.2 to 4.0 mm are used. The dependence for determining the load in the creasing zone is presented. According to the research methodology, the cardboard samples were sequentially loaded with increasing forces through the creasing ruler, each time they are kept for a certain time and unloaded. Thus, the ability of the material to repeatedly clear folds without destruction is evaluated.

Generalized graphs are presented separately for cardboard of different thickness and corrugated cardboard of E, B, C types. It is noted that all of them have a common feature – nonlinearity. The values of the change in the deformation characteristics of the samples are analyzed, i.e., the ratio of the maximum deformation to the residual. Rational values of running load are also determined to obtain high-quality creasing of the blank.

The presented recommendations for manufacturers and scientists can be applied to research, for example, the process of volumetric formation of packaging.

Keywords: cardboard, physical and mechanical properties, creasing, corrugated, bending, stand, load, compression, deformation, strength, dependence.

doi: 10.32403/0554-4866-2021-2-82-21-28


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