Overview
Bleached wood pulp is a refined cellulose product manufactured by chemically treating wood chips to remove lignin and other impurities, followed by bleaching to achieve high whiteness. It serves as a foundational material for high-quality paper and specialty cellulose applications. The production process typically involves the kraft (sulfate) method, where wood is digested in a solution of sodium hydroxide and sodium sulfide. Bleaching stages use chlorine dioxide, hydrogen peroxide, or ozone to attain brightness levels of 80–92% ISO.
Physical and Chemical Properties
Bleached wood pulp exhibits superior brightness (80–92% ISO) compared to unbleached variants, with residual lignin content below 1%. Its fiber length varies by wood source: softwood pulps (3–4mm) provide strength, while hardwood pulps (1–2mm) enhance smoothness. Chemically, it consists of 85–95% alpha-cellulose, with hemicellulose and trace minerals constituting the remainder. The material is hygroscopic, absorbing 6–10% moisture at standard conditions, and maintains thermal stability up to 200°C before decomposition.
Main Applications
The primary use of bleached wood pulp is in premium paper products, including printing/writing papers, food packaging boards, and specialty papers like currency or security papers. Its high purity makes it suitable for dissolving pulp in textile production (viscose, lyocell). In hygiene sectors, it's blended with fluff pulp for absorbent cores in diapers and feminine care products. Emerging applications include biodegradable filters, nanocellulose production, and as a reinforcement agent in composites.
Safety and Storage
As an organic material, bleached wood pulp presents minimal chemical hazards but requires careful dust control to prevent respiratory irritation. Storage facilities should maintain relative humidity below 65% to prevent moisture absorption and microbial growth. Pulp bales should be stacked on pallets with adequate ventilation, away from direct sunlight. Fire precautions are essential due to cellulose's combustibility. Suppliers typically provide Material Safety Data Sheets (MSDS) detailing specific handling protocols.
B2B Procurement Guide
Industrial buyers should specify key parameters: brightness (ISO%), viscosity (for dissolving pulp), fiber length distribution, and residual chemical content. Minimum order quantities typically range from 20–40 metric tons for containerized shipments. Certifications to verify include FSC/PEFC for sustainable sourcing and ISO 9001 for quality management. Price negotiations often consider long-term contracts, with quarterly adjustments linked to wood commodity indexes. Asian markets commonly trade on CIF basis, while European transactions use EXW terms.
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