L and W Crease Tester

Testing Procedure

Samples are clamped in a rotating jaw that applies a controlled deflection to the material. An l and w crease tester calculates the ratio between the bending resistance of the uncreased board and the force needed to bend the crease itself. This relationship is expressed as crease recovery or crease factor.

A low percentage indicates that the crease is effective and will stay closed once glued.

Data Application

Operators use the data to adjust the depth and width of the creasing rules on the die cutter. The l and w crease tester identifies board batches that are too stiff or too brittle for the intended packaging design. Consistent monitoring prevents waste by detecting material failures early in the manufacturing sequence.

Modern versions of the tool export data directly to quality management software for long term tracking.