KRAFT PULPING USING RED PINE (Pinus densiflora) ROOT BIOMASS

摘要

In chemical compositional analysis, root biomass had lower Klason lignin and higher polysaccharides contents than trunk biomass. In carbohydrate compositional analysis, root biomass showed higher in cellulose and glucomannan but lower in xylan than those of trunk biomass. In anatomical features, cell wall thickness in earlywood was not significantly different (3.8 μm for trunk cell and 3.3 μm for root cell), but in latewood, cell wall thickness was significantly different as 6.3 μm for trunk cell wall and 3.8 μm for root cell wall. In kraft pulping, trunk biomass showed better response to pulping than root in terms of kappa number at the same pulping condition. In fiber morphology, trunk fiber was longer (2.2mm) and thinner (30.6 μm) than root fiber (2.1 mm and 32.9 μm). In polysaccharides loss during kraft pulping, xylan in trunk and cellulose in root were more easily attacked by pulping chemicals. However, glucomannan was the weakest component toward kraft pulping. Root fiber showed better response to beating but lower fiber strength based on tensile-tear plotting.