Global Pulp Price Surcharges Raise Industrial Paper and Packaging Costs
Surging pulp feedstock costs will drive up contract paper and packaging prices by early autumn as mills pass on margin pressure.
Chemical Pulping
Fiber Separation
Industrial extraction processes isolate cellulose fibers from the lignin binder in wood chips using heat and chemical solvents. Through this method, chemical pulping preserves the long cellulose chains required for high-strength paper and paperboard production. The process dissolves approximately half of the wood substance, leaving a high-purity pulp that undergoes bleaching or direct pressing.
This output feeds the manufacture of containerboard and packaging grades where material strength is paramount. Mill operators adjust the cooking temperature and chemical concentration to suit different softwood and hardwood species, ensuring uniform fiber quality across production runs.
Energy Recovery
Yield metrics in these digestive processes typically run lower than mechanical alternatives but deliver superior material properties. In chemical pulping, the use of sodium hydroxide and sodium sulfide in the kraft process recovers nearly all processing chemicals for reuse within the mill. This closed-loop recovery boiler system generates steam and electricity, which reduces the external energy requirements of the facility.
The efficiency of this chemical recovery cycle determines the operating margin of the entire paper mill.
Process Variation
Subsequent purification stages depend on whether the final application requires high brightness or natural strength. Unbleached fibers find use in shipping boxes, while bleached variants go to writing grades.