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.
Matrix Wear Rate
Tool Longevity
Monitoring the erosion of creasing channels during high volume production runs allows converters to maintain the quality of the fold over time. The matrix wear rate describes the speed at which the creasing matrix loses its original dimensions due to the impact of the board. This factor is critical for predicting when the tooling must be replaced to avoid defective cartons.
Mechanical Friction
Each stroke of the die-cutting press forces the board into the channel and creates friction against the walls of the matrix. The abrasive nature of some board coatings or recycled fibers can accelerate the degradation of the material. As the matrix wears down the crease becomes wider and less defined.
This leads to variations in the folding force and can cause issues on the automatic packing line. Harder materials such as steel or phenolic resin offer a lower rate of wear than paper based products. Regular inspection of the crease height ensures that the mechanical pressure remains consistent throughout the job.
Process Output
Measuring the change in channel depth at regular intervals provides data for the calculation of the tool life. Unexpected increases in the wear rate often indicate a problem with the press setup or the board quality. The measurement defines the operational limit for a single set of creasing tools.
It ensures that the final packaging remains within the structural tolerances required by the customer.