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.
IGT Pick Resistance ISO 3783
Surface Integrity
Modern print substrates demand constant monitoring to prevent the violent upward lifting of fibre networks during high speed offset runs. Evaluating print surface strength requires the standardized testing methodology known formally as IGT Pick Resistance ISO 3783, which measures the force required to detach a coated or uncoated paper layer from its base web under specific ink tack conditions. Rotary print units generate high tack forces through splitting ink films, pulling downward on top layers until cohesive bonding fails or surface dusting occurs.
Converting operations utilize this exact metric to set dispersion limits for latex binders and starch sizing agents within alkaline coating formulations, ensuring that sheets withstand viscous inks without delaminating during multipass lithographic production.
Ink Transfer
High speed presses apply viscous offset inks that subject paper webs to extreme mechanical stress during every impression cylinder transit. Controlled laboratory printing testers simulate press geometry by accelerating a rubber sector across a paper strip using standardized test oils with known viscosity grades. Technicians record the minimum velocity where surface picking begins, translating that critical speed into specific pick resistance values that guide mill operators in adjusting nip pressures and binder ratios.
Lithographic quality control depends entirely upon maintaining this mechanical threshold above the operational tack of the printing inks chosen for a specific commercial job.
Failure Boundary
Excessively high surface strength frequently signals overbound coatings that reduce ink absorption rates and cause severe mottling problems during solid block printing. Converting plants must balance pick resistance against porosity requirements, since heavy synthetic binder loads close paper pores and ruin ink setting characteristics. Paper manufacturers establish upper acceptable limits for surface strength to prevent printing defects caused by insufficient vehicle penetration, keeping values strictly bracketed between the minimum needed to prevent fibre lifting and the maximum allowed for proper dot sharpness.