Finite Element Analysis And Experiment Research Of Corrugated Boxes

Corrugated boxes will replace wooden boxes and plastic box in the transport packaging, because of its light weight, high strength, easy processing, easy to fold, easy recovery and recycling, good printability, low cost. Corrugated boxes used in China most are more than five floors, which wastes too many wood resources, and damage the environment. In order to conserve resource, enhancing strength of corrugated boxes, reducing the use of raw materials is imperative. Therefore, starting from a set of affected factors on the strength of corrugated box, do an in-depth study of the factors to see the specific impact on strength of corrugated box at a particular aspect, so as to improve the design and production processes of corrugated box and provide a theoretical basis.There are many factors affected on the strength of corrugated boxes, one is basic factors, that is the main factors deciding the compressive strength of corrugated box, which can not be avoided; second are variable factors, that is in the process of designing or manufacturing of corrugated boxes which can not be avoided, such as the ratio of box size, print area and print design, hole size and hole position, corrugated boxes' manufacturing technology problems. While creasing and folding of corrugated boxes is the most important processes in the the corrugated boxes shaping process. In the creasing and folding process of large displacement and large deformation, the creasing width, creasing depth, creasing force and other factors have a great impact on the strength of corrugated boxes. With regard to this phenomenon, taking the corrugated boxes material nonlinearity and geometric nonlinearity into account, selected B-type single-corrugated boxes and BC double-corrugated boxes as the research object. The compression experiments of the entire corrugated box and the section of boxes were simulated by means of ANSYS finite element analysis software, Crushing force and displacement, deformation results, the distribution of displacement field and stress distribution of the section and the entire corrugated boxes were obtained. The results showed that the upper section of corrugated boxes' compressive strength was the highest, followed by the middle of corrugated boxes, the compressive strength of the whole boxes was the lowest. Do ECT experiments on B-type single corrugated board and BC-type double corrugated board after creasing, respectively. One was doing ECT experiments at different directions of the indentation, such as horizontal indentation, vertical indentation and fold to the indentation; second was holding indentation depth unchanged, doing ECT experiments at different indentation width.The results showed that ECT of corrugated board at vertical indentation was best than that at horizontal indentation; the larger the width of the indentation of corrugated board was,the lower the BCT of corrugated box was. Do BCT experiments on B-type single corrugated boxes and BC-type double corrugated boxes after cutting to three sections. The results showed that the strength of corrugated boxes essentially depended on horizontal folds. This paper provides a theoretical basis for improving the process of corrugated board creasing and folding and foundation for further research.