Benchmarking Laboratory Fiber Yield Assessment Methods for EcoModulation Fee Calculation
Laboratory fiber yield metrics depend on screen slot geometry and ash corrections, directly determining EPR eco-modulation fee surcharges on packaging.
Poly-Coated Board
Barrier Substrate
Composite materials consisting of a paperboard base and a thin layer of extruded plastic provide a liquid-proof surface for demanding environments. Use of poly-coated board is standard in the production of milk cartons, frozen food boxes, ice cream tubs, and paper cups where moisture resistance is mandatory. The polymer layer, usually polyethylene, acts as a moisture vapour barrier and allows the edges to be heat-sealed.
This combination provides the structural stiffness of paper with the protective properties of plastic.
Molten Resin
Molten resin is applied directly to the moving paper web at high speeds to create a permanent bond. In the manufacture of poly-coated board, the thickness of the coating is measured in grams per square metre to ensure consistent performance. Single-sided coating protects against external humidity, while double-sided coating is necessary for containers holding cold liquids to prevent condensation from soaking into the fibres.
Precise control of the corona treatment on the plastic surface ensures that inks and adhesives adhere correctly during later stages of conversion.
Thermal Bonding
Thermal bonding replaces traditional glues in the assembly of these packages. When poly-coated board is passed through a heat sealer, the plastic layers melt and fuse together to form a leak-proof join. This mechanism allows for high-speed automated filling lines in the beverage industry.