Creasing Protocol
Performance specifications for the creasing and folding of paperboard packaging are established by this technical document. Adherence to bs 6965-1 provides a method for measuring the resistance of a crease compared to the stiffness of the uncut board. This ratio determines whether a carton will form correctly on a high speed filling line.
Stiffness Ratio
Testing equipment measures the bending moment of the material in its uncreased state and then repeats the measurement on a sample with a central crease. The percentage of the original stiffness that remains after creasing is the primary output defined in bs 6965-1. High ratios indicate a crease that is too stiff and may cause the carton to bow or fail under pressure.
Such failures lead to production downtime or damaged product during the distribution cycle.
Process Control
Converters use this metric to adjust the depth and width of the creasing rule during the die cutting process. If the value falls outside the specified range, the operator must modify the make ready or the moisture content of the substrate. This standard applies to most solid bleached boards and duplex grades used in food packaging.
Regular testing ensures that the packaging remains easy to fold for the assembly machine.
