Fibre Geometry
Corrugated medium relies on fluted paper configurations that generate structural resistance under compression forces. Wellenstoff forms the central fluted component of a combined board structure, bonded between flat linerboards to create vertical hollow channels. Production lines employ steam heated corrugating rolls to deform the web into specific profiles that dictate the stacking performance of the finished corrugated box.
Converters designate flute geometries through standardized letter codes that define the height and pitch of each wave. These geometric parameters control the caliper and bending stiffness of the combined board during subsequent converting operations and end use.
Compression Load
Flute orientation determines the vertical crush resistance of corrugated packaging exposed to static warehouse loads and pallet stacking stress. A higher flute density per linear metre yields greater flat crush strength, whereas taller profiles deliver superior edge crush resistance and shock absorption during transit. Converting plants monitor medium weight and tensile energy absorption to prevent flute fracture during the high speed forming process.
Variations in humidity alter the moisture content of the paper web, which directly influences the compressive yield point of the fluted layer. Structural engineers calculate box compression strength using combined board thickness and the dynamic load capacity of the internal fluting medium.
Dynamic Tension
Production speeds depend on the tensile strength and moisture absorption rates of the paper web entering the single facer. Tension control systems regulate reel braking torque to prevent web rupture as the paper passes between the corrugating rolls. Adhesive application units deposit starch paste onto the flute tips to secure the bond between the medium and the outer linerboard.
Proper gelatinisation of the adhesive requires precise temperature regulation across the preheater drums and the hot plate section of the corrugator. Bond failure reduces the corrugated board stiffness and causes delamination during die cutting and box erection.
