Designing Counter Die Relief Profiles for Laminated Folding Boxboard
Counter die relief profiles for film laminated folding boxboard require expanding channel widths by twenty percent to prevent outer film shear tearing.
Crease Stiffness Testing
Mechanical Resistance
Measurement determines the load required to bend a paperboard sample at a designated angle after a fold has been introduced. This crease stiffness testing procedure evaluates the recoverability of the fiber matrix near the hinge, providing data necessary for predicting the closing torque of high speed folding cartons. Force sensors record the peak load encountered during the deflection cycle to quantify the integrity of the substrate structure.
Bending Geometry
Variations in paper grain direction often result in divergent force readings during the evaluation. A fiber orientation aligned with the crease axis increases the material resistance while a perpendicular grain orientation yields a lower value. Converting equipment setups rely on these standardized inputs to prevent jamming on automatic filling lines.
Sufficient rigidity prevents carton bulging under tension, whereas excessive material resistance forces the filling machinery to operate at higher pressures. These outcomes dictate the operational limits for every packaging design.
Testing Parameter
Standard protocols specify the distance between the clamping mechanism and the axis of rotation to maintain consistency across different laboratory environments. The angle of rotation typically reaches fifteen or thirty degrees to capture the behavior of the hinge throughout its primary deformation phase. Operators calibrate the instruments against a known spring constant to ensure the accuracy of the torque readings across the entire scale.
A precise correlation exists between the measured bending moment and the eventual performance of the finished carton on the production line.