Kinetic Resistance
Physical resistance measured between two moving paper surfaces governs how sheets slide during high-speed feeding and stacking operations. A low dynamic friction coefficient allows paperboard blanks to separate cleanly in automated folding carton machinery. Mill testing utilizes a horizontal sled apparatus moving at constant velocity to quantify force ratios.
Wax additives and varnish coatings modify sliding properties across converted packaging stocks.
Surface Interaction
Measurement protocols specify standard sled weight and atmospheric conditioning to guarantee repeatable sliding friction readings across production shifts. A low dynamic friction coefficient prevents jamming in printer slotters, whereas excessively low values cause stack instability during pallet transport. Test instruments record the steady towing force once initial static movement transitions into continuous sliding.
Microscopic surface asperities and chemical migration from sizing agents directly alter kinetic resistance values. Calender nip pressure and coating viscosity further influence contact area between sliding sheets.
Convertor Performance
Converting lines require precise friction levels to maintain registration during feeding. Boxboard surfaces coated with water-based barriers often exhibit sliding resistance variations caused by ambient humidity changes. Uncontrolled kinetic movement leads to misaligned folds or surface scuffing during cartoning.
Sliding performance remains stable when coating chemistry and calender nip pressure remain within set parameters.
