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Eucalyptus pulp and paper and wood variation of the potential


Significant difference between the ratio chamber, was gradually increased from the pith outward rule; microfibril angle, L the number of larvae per unit area and fiber tube lumen ratio significantly different, was gradually decreased from the pith outward rules; and wood rate of cell wall, wood fiber proportion, vessel proportion,[link widoczny dla zalogowanych], ray proportion, axial parenchyma and wood fiber on cell proportion was no significant difference in diameter. According to different parts of the disc height sampling test results, a variety of wood cell wall material in the direction of certain height and the variation from the tree base upwards, hemicellulose content increased, decreased lignin content, cellulose higher content of the central trunk,[link widoczny dla zalogowanych], trees and tree-based low pentosan content increased gradually from the tree base upwards; wood extractive content in the trunk there is a certain high degree of variation, from the tree base upwards, cold water extract and hot water extracts were increased to reduce, 1% NaOH extractive content in the middle of the trunk lower ends higher; wood of different pH value in the trunk height difference was not significant. The study also found that E. urophylla clones, the major wood traits of the strain Q was not significant, but not of the system to ask wood traits significantly different urophylla wood fiber width and the growth rate was positively correlated with wood density negative related. 4 Zheng Bai, Li Qiong early Huangxi Ze, et al: eucalyptus pulp and paper making potential and material variation of 185 Table 68 years old E. urophylla (U20) Wood of strains and strains of smell variation Table 78 years old E. urophylla asked the wood of different clones 3 Conclusions 3.1 The variability of the 8 tested their young eucalyptus tree wood density 460 ~ 640kg / m, belongs to an acceptable level paper. 3.2 The impact the quality of old wood pulp. Lemon Eucalyptus exserta Eucalyptus and 5.5 years old and 15.5 years old sample trees, the test results show that the basic density of these two species with the increase of age; lemon eucalyptus pulping process must base the amount of large old to be low, while the pulp slurry rate was higher than the old small (5.5 years old); but Eucalyptus exserta contrary to the situation. Two age groups like lemon eucalyptus wood is basically the same characteristics of paper. Eucalyptus exserta 15.5 years while the student paper features like wood-like than the 5.5 year old trees to be poor. Age 5.5 years old plantation of Eucalyptus Kraft pulp production suitability. Basic density of wood, pulp and bleaching process needs, the yield of pulp,[link widoczny dla zalogowanych], paper strength and visual evaluation of the effects of: Eucalyptus, Eucalyptus grandis �� Eucalyptus urophylla, Eucalyptus urophylla, Eucalyptus grandis, Eucalyptus citriodora, Eucalyptus rounded, large inflorescence Eucalyptus, Eucalyptus exserta. 3.2 Eucalyptus wood extractive content in the trunk height were different. The trend is: the tree base upwards,[link widoczny dla zalogowanych], cold water and hot water extract extract content decreased gradually; 1% NaOH extractive content in the middle of the lower trunk, both ends of the high. Urophylla wood cell wall material content in the trunk height were significantly different. The trend is: the tree base upwards, gradually reduce the lignin content; pentosan increasing water content; cellulose slightly higher water content in the trunk of the middle, both ends slightly lower. Urophylla pH value of wood from the tree base upwards, there is a growing trend; analysis did not reach statistical significance level. 3.3 Fertilization can promote tree growth, will increase the extractive content in wood. Urophylla extractive content in wood and tree growth rate is positively correlated. Fertilization and pentosan content in wood and tree growth rate was positively correlated, while cellulose and lignin content and growth rate of trees weak negative correlation. Fertilization on fiber length had no significant effect, while the fiber width was significantly larger role, especially in application of P fertilizer or nitrogen, phosphorus,[link widoczny dla zalogowanych], potassium and trace elements in mixed fiber broadens the giver is more effective. Fertilization on Eucalyptus urophylla wood fibers have significant impact angle. Applied nitrogen fertilizer significantly increased angle of wood fibers; and applied nitrogen + phosphorus or nitrogen, phosphorus, potassium and trace elements when mixed fertilizer will reduce the angle of wood fibers.
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