Fibre Based Packaging Fees Set by the Substrate You Specify
Substrate selection fixes structural caliper, web trim yield, repulpability, and EPR eco-modulation fee tiers, governing net landed carton costs.
Cobb 60 Water Absorption ISO 535
Surface Wetting
Liquid intake per unit surface area over a defined exposure period quantifies the degree of sizing applied to paper and board. Defined in cobb 60 water absorption ISO 535, the standard procedure measures the mass of water absorbed by one square meter of substrate over sixty seconds of direct contact. The protocol evaluates the effectiveness of internal sizing agents and surface barrier treatments under zero hydrostatic pressure.
Boundary limitations occur when testing porous tissue grades or non-absorbent plastic-laminated boards where wetting exceeds saturation or fails to penetrate within one minute.
Sizing Mechanism
Fibre treatment with alkyl ketene dimer or alkenyl succinic anhydride alters internal cellulose polarity. Adjusting sizing chemistry directly regulates cobb 60 water absorption ISO 535 values across virgin and recycled fibre matrices. Starch application at the size press seals porous capillary networks to limit aqueous penetration into base sheets.
Surface hydrophobic agents control ink feathering and edge wick during wet printing processes.
Packaging Performance
Corrugated boxes and refrigerated packaging require low liquid uptake to prevent fluting collapse in humid supply chains. Uncontrolled liquid penetration reduces box compression strength and causes corrugated container sides to bulge under vertical weight. Applying cobb 60 water absorption ISO 535 monitoring on containerboard reels establishes whether linerboard retains structural stiffness when exposed to condensation in cold storage.
Target values between twenty and thirty-five grams per square meter prevent aqueous adhesive failure during box sealing operations. Substrates showing excessive moisture absorption weaken rapidly during outdoor pallet storage. Calibrated sizing treatments secure reliable glue bond adhesion during high-speed case erecting.