Defibration Yield
Mechanical separation and recovery of reusable cellulose fibers from paper and treated packaging under standard hydropulper conditions measures recycling performance. Known as repulpability efficiency, this quantitative parameter assesses the percentage of clean, usable papermaking fibers recovered relative to the initial dry weight of the processed board. The test protocol measures fibre separation rates, screening losses and reject quantities generated during standard repulping cycles.
The measurement stops applying to non-recyclable composite materials designed for permanent thermal disposal or chemical monomer recovery.
Screening Protocol
Laboratory hydropulpers agitate shredded packaging samples in water at controlled temperatures, consistencies and durations. Testing for repulpability efficiency routes the resulting pulp slurry through slotted laboratory screens to isolate accepted fibers from non-dispersible debris. Adhesive fragments, synthetic plastic laminations and insoluble coating particles are collected as screen rejects.
High mechanical efficiency yields clean fiber stocks without generating persistent micro-stickies that foul paper machine forming wires.
Fiber Recovery
Sourcing recyclable packaging boards requires independent verification that barrier layers break down rapidly in municipal recycling systems. Low repulpability efficiency indicates heavy polymer films, crosslinked waxes or insoluble adhesives that clog commercial mill pulping screens. Modern aqueous barrier coatings are formulated to disperse completely during normal repulping cycles, achieving fiber recovery rates above ninety percent.
Packaging converters specify certified recyclable substrates to avoid commercial waste processing surcharges and ensure compliance with packaging circularity targets. Certified high-yield substrates re-enter the paper stream without leaving troublesome polymeric residues. High recovery rates preserve fiber quality across multiple recycling cycles.
