Predicting Delamination Behaviour in Multi Layer Paperboard Creasing
Predicting paperboard delamination requires balancing Z-direction shear strength to permit core separation while preventing outer liner tensile fracture.
Finite Element Analysis
Computational Method
Computational method utilizes numerical techniques to predict how a physical structure responds to external forces and environmental conditions. Engineers use finite element analysis to break down complex packaging geometries into smaller, manageable pieces called elements. This approach allows for the simulation of stresses and strains in a virtual environment before physical prototypes are manufactured.
It provides a detailed map of where a structure is likely to fail under a specific load.
Modeling Process
Modeling the behavior of a corrugated shipping container requires defining the material properties of each individual liner and the fluting medium. Through finite element analysis, designers can predict the top to bottom compression strength of a box while varying the flute profile or the basis weight of the paper. This digital testing identifies stress concentrations near corners or hand holes that might lead to premature collapse.
The simulation accounts for both the linear elastic properties and the non linear buckling behavior of the board.
Simulation Constraint
Simulation constraint dictates the accuracy of the result which depends on the precision of the input data and the choice of boundary conditions. If the moisture content or the creep properties of the paper are not correctly specified, the finite element analysis will yield misleading predictions.