Study On Out-of-Plane Load Bearing Properties Of Honeycomb Paperboard Filled With Foam Particles

Honeycomb paperboard is widely used in transportation packaging as a low-cost,high compression resistance,and good cushioning performance packaging material.In the process of carrying goods or transportation,the pressure of honeycomb paperboard usually comes from its out-of-plane direction,so it is important to improve the out-of-plane compressive strength of honeycomb paperboard to expand its engineering applications.In this paper,a new type of honeycomb paperboard filled with foam particles was proposed,aiming to improve the loadbearing capacity and energy absorption characteristics of honeycomb paperboard.The out-ofplane compression response and energy absorption characteristics of honeycomb paperboard filled with foam particles were investigated by a combination of experimental and theoretical methods.In addition,the effects of different environmental humidity on the out-of-plane load bearing capacity and energy absorption performance of honeycomb paperboard filled with foam particles were also investigated,and the corresponding theoretical models were established.The main research contents and results of this paper are as follows:(1)The out-of-plane load bearing performance and energy absorption capacity of honeycomb paperboard filled with foam particles were studied experimentally.The out-ofplane static compression tests were conducted on the honeycomb paperboard filled with foam particles and the unfilled standard honeycomb paperboard.The test results show that the outof-plane crushing response of the honeycomb paperboard filled with foam particles has the characteristics of both honeycomb paperboard and foam particle out-of-plane crushing responses and shows an exponentially increasing curve in the stress-strain diagram;the compressive strength and energy absorption of the honeycomb paperboard filled with foam particles are enhanced.Moreover,the smaller the size of foam particles,the greater the increase in compressive strength and energy absorption.(2)Based on the relevant theory,the out-of-plane static load bearing theoretical model of honeycomb paperboard filled with foam particles under a standard environment was initially discussed.Based on the deformation process of honeycomb paperboard and foam particles during the out-of-plane static compression process of honeycomb paperboard filled with foam particles and the type of interaction between foam particles and the cell wall of honeycomb board(point contact gradually transformed to surface contact),the theoretical model of out-ofplane static load bearing of honeycomb paperboard filled with foam particles was deduced.The theoretical curves were verified to be in good agreement with the experimental curves.(3)The theoretical model for the out-of-plane static load bearing of honeycomb paperboard filled with foam particles was initially discussed based on the effect of humidity.Firstly,the influence of relative humidity on the mechanical properties of base paper and the out-of-plane load bearing properties of honeycomb paperboard filled with foam particles was studied experimentally.Then,on the basis of the theoretical model of out-of-plane static load bearing of honeycomb paperboard filled with foam particles under a standard environment,the relationship between the relative flow stress of base paper and the change in relative humidity was introduced,so that the theoretical model of out-of-plane static load bearing of honeycomb paperboard filled with foam particles considering the effect of humidity was established.The theoretical curves were verified to be in good agreement with the experimental curves.(4)The theoretical model for the out-of-plane energy absorption of honeycomb paperboard filled with foam particles under standard environments and different relative humidity environments was initially discussed.Firstly,the effects of structural parameters of honeycomb paperboard,foam particle size,and relative humidity on the energy absorption characteristics of honeycomb paperboard filled with foam particles were studied experimentally.Then,based on the simplified mechanical model of honeycomb paperboard filled with foam particles,the theoretical model of out-of-plane energy absorption of honeycomb paperboard filled with foam particles under a standard environment was constructed.Finally,the humidity effect was introduced into the theoretical model of out-of-plane energy absorption of honeycomb paperboard filled with foam particles under a standard environment.Finally,the theoretical model of out-of-plane energy absorption of honeycomb paperboard filled with foam particles under the influence of the humidity effect is introduced into the theoretical model of out-ofplane energy absorption of honeycomb paperboard filled with foam particles under the standard environment.The theoretical curves were verified to be in good agreement with the experimental curves.This paper not only provides a theoretical basis for the practical application of filled honeycomb paperboard but also provides a reference for the improvement and optimization of honeycomb paperboard.