Lead Time Each Added Pass Buys between Approval and Pallet
Each added pass adds 24 to 48 hours of lead time through mandatory inter-pass drying, thermal stabilization, tooling lead times, and offline queue staging.
Hydrapulping Fiber Yield
Processing Efficiency
Secondary fibre recovery in paper recycling relies on the separation of usable cellulose from coatings, adhesives, and contaminants. Hydrapulping fiber yield represents the percentage of dry fibre recovered from the pulping stage relative to the dry weight of the incoming wastepaper. This metric determines the raw material cost and the efficiency of the recycling process, as higher yields reduce the volume of waste sent to landfills.
It is measured after screening and cleaning steps have removed non-fibrous materials.
Quality Variable
Mechanical action and water temperature play major roles in maximizing the extraction of clean fibres from recycled board. Hydrapulping fiber yield is influenced by the rotor speed of the pulper and the duration of the cycle, which must be optimized to break down the paper without grinding the plastic coatings into microscopic fragments. If the process is too short, large clumps of unpulped paperboard are rejected by the primary screens, which directly lowers the yield.
Adding chemistry can assist in wetting out the board.
Recovery Optimization
Recovered fibre yield determines the economic feasibility of using recycled testliner over virgin kraftliner. Paper mills must monitor this yield continuously to adjust their chemical additions. Proper process control increases the output of high-grade recycled paper.