Single Sided Lamination Curl against the Flatness Filling Lines Need
Single-sided lamination curl is controlled by balancing nip heat, reverse dampening, decurling bar tension, and conditioning board to filling line humidity.
CEPI Recyclability Grade
Evaluation Framework
Standardised laboratory scorecards establish uniform verification for the repulpability and sortability of paper and packaging products inside European recovery streams. Established under the European paper industry confederation, the cepi recyclability grade assigns a qualitative tier to finished converted substrates based on standardised batch disintegration and screening trials. The assessment protocol subjects the complete converted product, including varnishes, adhesives, foils and barrier coatings, to precise pulping cycles that simulate industrial secondary fibre mills.
Scores range from full recyclability down to total rejection, establishing whether packaging can enter standard sorting infrastructure or requires specialised mill equipment. The protocol terminates at the boundary of fibre re-use and rejects products whose non-paper additions exceed standard operational thresholds.
Laboratory Procedure
Disintegration occurs in a standardised laboratory pulper operating at specified consistency, water hardness and slurry temperature for a fixed count of revolutions. The resulting stock is fractionated through coarse slotted screens of six-tenths of a millimetre aperture followed by fine screens of one hundred and fifty microns to isolate non-dispersible residues. Coarse rejects, adhesive macrostickies, visual flake counts and total recovered yield are measured gravimetrically against starting dry mass.
Adhesives that fragment into micro-particles under mechanical shear are evaluated through automated optical scanning to determine whether sticky contaminants will redeposit onto paper machine forming wires. Visual cleanliness of sheet samples cast from the accepted fibre fraction confirms whether functional inks or coatings cause unacceptable optical blemishes.
Sorting Compliance
Fibre yield must exceed eighty-five percent of dry input weight for packaging to achieve a passing tier in standard mill processing streams. Rejects consisting of plastic laminations, wet-strength resins and metallised transfers must separate cleanly without consuming excessive cycle time. Products yielding sticky residues that coat paper machine fabrics fail the qualification immediately, regardless of base fibre volume.
Water-soluble polymers and degradable dispersion barriers must neither coagulate into adhesive agglomerates nor generate heavy chemical oxygen demand loads in re-circulated process water. Mill acceptance depends on this classification to exclude contamination risks from municipal recovery furnish.