Deinkability Score Impact on EPR Eco Modulation Fees in Recycled Stock
Deinkability scores under INGEDE Method 11 directly determine EPR eco-modulation fee surcharges or discounts on printed recycled paperboard packaging.
Brightness Recovery
Optical Restoration
Evaluation of paper pulp quality during the recycling and deinking process includes measuring the return of light-reflecting properties after chemical treatment. This measurement, known as brightness recovery, indicates the efficiency of ink removal and lignin extraction from the recovered fibres. High optical performance is necessary for producing premium printing grades from recycled stock.
Bleaching Action
Chemical agents such as hydrogen peroxide or sodium hydrosulfite are added to the pulp slurry to oxidize or reduce residual chromophores in the fibre wall. This process increases the reflectance of the pulp, and the percentage increase is measured against the initial unbleached state of the recycled furnish. Monitoring this chemical reaction allows mills to optimize their chemical dosing and reduce operating costs while maintaining the target brightness of the final board.
Degradation Resistance
The stability of the recovered optical property is tested by exposing the paper to heat and light to simulate natural aging. Pulp that has achieved high brightness through aggressive bleaching can suffer from yellowing if the residual chemicals are not thoroughly washed out. Consequently, measuring the retained brightness after aging tests provides a true measure of the longevity of the recycled paperboard.
Paper mills use this value to ensure that the printed packaging does not discolour on retail shelves.