Enzymatic Cleavage
Catalytic protein fractions target ester bonds within synthetic binders and natural sizing resins during paper machine whitewater processing. Esterase enzymes break down fatty acid chains and polyvinyl acetate emulsions that foul wet end circuits and press felts. Hydrolytic scission reduces molecular weight fractions until dissolved organic carbon species pass through wire retention stages without agglomerating on metal rolls.
Papermakers dose specific volumetric units per dry metric ton of pulp slurry to manage deposit accumulation inside closed loop water systems. Residual activity diminishes rapidly beyond neutral pH parameters and elevated thermal thresholds.
Substrate Hydrolysis
Converted packaging substrates containing bio-based barrier coatings experience targeted polymer degradation when exposed to these biocatalysts during recycling pulping operations. Ester linkages holding polylactic acid films or modified starch sizes together undergo rapid cleavage inside repulpers operating at moderate temperatures. Polymer chain scission transforms insoluble lamellar coatings into water-soluble monomer fragments that separate cleanly from cellulosic fibres during flotation deinking stages.
Repulping efficiency increases because modified starches lose their wet strength capacity entirely within minutes of exposure. Mill operators monitor chemical oxygen demand spikes in filtrate streams to verify that complete breakdown of the coating matrix has occurred prior to secondary clarification.
Resin Deactivation
Adhesive residues originating from pressure-sensitive label laminates undergo targeted ester bond cleavage to prevent sticky agglomeration on calender stacks and drying cylinders. Esterase enzymes hydrolyze the soft polyacrylate and polyester components found in hot melt formulations, transforming sticky contaminants into non-tacky colloidal suspensions. Converted stock containing recycled post-consumer waste streams relies on this biocatalytic action to eliminate pick defects on high-speed printing presses.
Filter pressing operations capture the resulting fragmented debris easily alongside conventional ash and filler pigments. Finished paper reels maintain surface cleanliness standards required for high-end graphic reproduction without generating press downtime.
