Research On The Influence Of The Humidity To Cushioning Properties Of Honeycomb Paperboard

Due to the environment-fiiendly,high property-to-cost ratio and favorable cushioning properties,the honeycomb paperboard is favorable to package,and one of wide-spread use packaging material.Research on energy absorption properties of honeycomb paperboard play an important role in the cushioning packaging design.Analyzing the importance of testing elastic modulus of raw paper,illustrating the test method with 105g/m² and 160g/m² kraft paper,referring to the test standard JB/T6544-93 and GB/T 4857.2-2005,mechanical property of raw paper is tested,the effect of the humidity to elastic modulus E_s and the critical buckling stressσ_pl of the raw paper is analysed.In this paper,stress- strain curves of different kinds of honeycomb paperboard is ploted, based on static compress experiment,under four relative humidity conditions(30%,50%,70% and 90%).Study the influence of the humidity to peak stress,elastic line elastic modulus E_s and the critical buckling stressσ_pl of the honeycomb paperboard.The influence of the humidity to the critical buckling stressσ_pl of the honeycomb paperboard is showed distinctly after contrast to relational expression of the critical buckling stressσ_pl of the honeycomb paperboard, buckling stressσ_ys and thickness-length ratio(t/l) of the honeycomb cell-wall.From the factors of honeycomb paperboards,the models are respectively made for the energy absorption curves for the three distortion sections by subsection function.With the experiment,the model is characterized by energy absorption and stress,standardized by the solid modulus E_s of paper honeycomb cores.Different honeycomb structures with the different material under four relative humidity conditions(30%,50%,70%and 90%) can be illustrated by the same energy absorption curve.These results indicate that with the increase of the relative humidity,elastic modulus E_s of the honeycomb paperboard reduce,the best energy absorption dot move left and reduce.The conclusion of this paper play an importance role in analysis and research on the influence of the environmental factors to cushioning properties of packing material,estimate technique of the honeycomb paperboard cushioning properties,and structural parameter optimum design.