Optimizing Creasing Tool Geometry for Barrier Coated Boxboard Converting
Optimizing creasing geometry for barrier board requires expanding female channel width and applying polished male rule radii to prevent barrier film splitting.
Crease Stiffness ISO 5628
Structural Requirement
Comparison of the force needed to bend board against its original flat state provides the foundation for evaluating structural performance during automated folding. Operators utilize crease stiffness iso 5628 to measure the force required to bend a pre-scored board through a specific angle. This value determines the pressure needed by the folder-gluer to close the flaps of the package.
Geometric Deformation
Testing involves a specialized apparatus that holds the board sample and records the torque exerted during the bending process. The relationship between the board thickness and the depth of the crease is a primary factor in the final reading. Deep creases reduce the resistance of the fibers and allow for a cleaner fold without cracking the surface coating.
Mechanical properties of the pulp and the orientation of the grain influence the consistency of the result. Excessive stiffness can cause the carton to spring open after the gluing process is complete. Proper calibration of the crease depth ensures that the test reflects the actual conditions of the manufacturing line.
Conversion Limit
Differences in the moisture content of the board can change the force required to bend the material. Dryer conditions often lead to higher resistance and a greater risk of board failure. The standard sets the boundary for the maximum allowable torque to prevent machine downtime.
It serves to verify that the board grade is suitable for the high speeds of modern packaging equipment.