Neutral Sulfite Semi-Chemical Pulping of Moso-Bamboo

摘要

This research investigates the potential of neutral sulfite semi-chemical（NSSC)pulping method using moso-bamboo（Phyllostachys pubescens)as raw material.NSSC treatment took place in laboratory cooking system.Cooking liquor contained a mixture of sodium sulfite（Na2SO3)and sodium carbonate（Na2CO3)with a weight ratio of 2 to 1.rotal chemical charge was 12% based on oven-dried weight of bamboo chips.Liquor to solid ratio was 4 to 1.Two-stage refining was used to fabricate fibers from cooked chips.The first stage was at 0.2 MPa and 120°C and,the second stage was at normal pressure.A control experiment was involved under the same conditions with no charge of chemicals.NSSC pulping of bamboo resulted in providing a low brightness pulp but high pulp properties（tensile and tear indices)compared to the control pulp.NSSC method could help to reduce the contents of un-separated fiber bundles and shives.NSSC method provided a high aspect ratio of fibers compared to the control.After fibers development and fibrillation during refining,NSSC pulp contained a lot of ribbon-like fibrils which then contributed to a good fiber-to-fiber contact In addition,the internal bonding between fiber-to-fiber of NSSC pulp may be increased reasonably by a significant amount of parenchyma cells appearing as fines（100 mesh pass)fraction,which were revealed by SEM images evaluation.