Research On The Longitudinal Compression Mechanical Behavior Of Corrugated Paperboard Based On The Face Paper-Core Paper Interaction

Corrugated paperboard has an excellent cushioning effect and is widely used in the transportation and packaging of various products such as electronic products and daily chemical products.During transportation,the side panels of the corrugated box will be subjected to longitudinal compression loads.Therefore,it is necessary to research the deformation mechanism and longitudinal compression mechanical properties of corrugated core paper and face paper.This paper studies the mechanical behavior of corrugated paperboard in longitudinal compression utilizing a combination of experiment and theoretical analysis.Taking into account the changes in environmental humidity conditions during transportation,this paper analyzes the influence of environmental humidity changes on the longitudinal load-bearing performance of corrugated paperboard and establishes a corresponding theoretical model.Finally,considering the environmental humidity and the face paper-core paper interaction,a theoretical model of corrugated paperboard longitudinal compression energy absorption that can fully reflect the effects of microstructure parameters,material physical parameters,and environmental humidity is established.The main research contents include:(1)Experimental study on the longitudinal quasi-static compressive mechanical properties of corrugated paperboard considering the face paper-core paper interaction.Corrugated paperboard of different thicknesses is selected for longitudinal compression tests to study the influence of paperboard thickness on the deformation mode and plateau stress of corrugated paperboard.In addition,the influence factor of environmental humidity was further considered,and the influence of humidity on the longitudinal quasi-static compression mechanical properties of corrugated paperboard was studied.The results show that when the environmental humidity reaches 85% and above,with the increase of humidity,the plateau stress and initial peak stress of the corrugated paperboard have a significant decreasing trend.(2)Considering the face paper-core paper interaction,the theoretical model of corrugated paperboard longitudinal compression plateau stress is established.When subjected to longitudinal compressive loads,corrugated core paper and face paper will undergo different deformations.The physical mechanism of the face paper-core paper interaction will be changed when the thickness of the paperboard is different.This paper selects three modes with a high proportion of deformation for research,namely "the no-separation deformation mode of face paper and corrugated core paper","the partial separation deformation mode of face paper and corrugated core paper" and "the complete separation deformation mode of face paper and corrugated core paper".The plateau stress theoretical models under the three deformation modes were established respectively and compared with the test results to verify the accuracy of the models.(3)Establish a theoretical model of corrugated paperboard longitudinal compression plateau stress based on humidity effect.Relative humidity will not only reduce the ultimate stress of the corrugated base paper but also weaken the face paper-core paper interaction,resulting in a decrease in its mechanical properties.The influence of environmental humidity influence factors on the ultimate stress of the corrugated base paper and the face paper-core paper interaction structure is introduced,and the plateau stress theoretical model established above is revised.(4)On the basis of the above research,the corrugated paperboard longitudinal compression energy absorption theoretical model that can fully reflect the influence of microstructure parameters,material physical parameters,and environmental humidity is finally established.