Creasing Matrix Channel

Die-Cutting Tooling

A precision-engineered groove within a plastic or pressboard strip provides the negative space into which a creasing rule pushes the paperboard to form a fold. The creasing matrix channel must be wider than the rule thickness plus twice the board thickness to ensure a clean crease without rupturing the surface fibres. It is adhered to the cutting plate to ensure perfect alignment with the steel rules on every impression.

This precise positioning is necessary because even a fraction of a millimetre of drift will cause the crease to be off-centre.

Geometric Requirement

Selection of the correct width and depth determines the structural integrity of the finished carton. If the space is too narrow, the pressure will crush the board and cause cracking on the outer liner. A space that is too wide results in a weak, poorly defined fold that fails to hold its shape.

Material Interaction

Different board grades require specific channel profiles based on their density and fibre length. Stiff, high-bulk boards need more room for the internal fibres to delaminate and form a bead. Without this controlled delamination, the fold will not act as a hinge and the box will not square up.