Repulpability PTS-RH 021/97

Recovery Index

Evaluating the dispersion efficiency of coated substrates requires measuring the mass proportion of usable pulp recovered through standard screening procedures. Coaters apply specific polymer dispersions to packaging stocks to resist moisture or grease, yet these treatments frequently hinder subsequent defibering during recycling. The testing standard isolates the undigested residue to calculate the percentage of fibre loss resulting from incomplete coating breakdown.

Production managers adjust binder formulations and coat weights when disintegration rates fall below acceptable thresholds for secondary fibre mills. Lower recovery rates indicate that cross-linked barrier layers restrict water penetration and prevent individual cellulose strands from separating under standard hydrodynamic shear. Environmental labelling schemes rely on these quantified dispersion values to certify that specialized printing inks and varnishes do not compromise the circularity of paper streams.

Thermal Variance

Process temperatures directly influence the softening point of functional barrier coatings and thermoplastic lamination adhesives during aqueous disintegration tests. Elevated water temperatures accelerate the breakdown of weak hydrogen bonds within coated paper structures, facilitating faster fibre separation in industrial repulping systems. Laboratory technicians monitor fluid thermal stability because minor temperature fluctuations alter the rate at which synthetic binders dissolve or disperse into the surrounding slurry.

This thermal sensitivity determines whether a packaging grade processes effectively in cold pulping mills or requires specialized warm water recovery lines. Strict temperature control prevents anomalous test results caused by premature polymer melting or incomplete resin softening during the standardized disintegration cycle.