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Influence of Bamboo Ages on the Pulping Performance of Phyllostachy Pubescens

Author: CuiMin
Tutor: ZhangShuangBao；YinYaFang
School: Beijing Forestry University
Course: Wood Science and Technology
Keywords: Bamboo Bamboo age Pulping properties Affect
CLC: TS721.2
Type: Master's thesis
Year: 2010
Downloads: 64
Quote: 1
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Abstract

The Moso Bamboo as our first Otake kinds, is one of the main wood species of pulpwood nurtured. In this paper, bamboo quantitative anatomy, the standard method of the relevant physical and chemical properties testing five different bamboo age the (0.5,1,2,4,6 years old) Moso bamboo wood anatomy, physical and chemical properties and its variations in the study; through late Pulp and Paper experimental study 1,2,4 years old bamboo cooking and bleaching performance, a comprehensive evaluation of the adaptability of its paper. Specific conclusions are as follows: the performance of different bamboo age Moso bamboo wood anatomy study shows that: 1) Moso bamboo fiber average length of 2.18-2.46mm, and increase gradually with bamboo age four years when the maximum value and then stabilized, high degree of variability in the longitudinal direction not significant; 2) the average width of the Moso bamboo fibers 12.80-14.03μm, showed a slight increase in basic with bamboo age, no significant rule changes with longitudinal height; 3) Moso bamboo fiber average aspect ratio of 163.63-185.88, with bamboo age substantially increase trends; 4) distribution density of vascular bundles in the Takenaka and Shiraia parts with bamboo age showed a slight increase in B position is greater than the A position along the the longitudinal height Moso bamboo stems C position distribution of vascular bundles density is greater than Zhuqing at no significant law ; radial variation Zhuqing gt; Takenaka gt; Shiraia; 5) microfibril angle Zhuqing at an average of 9.202 ° microfibril angle of Shiraia at an average of 9.583 ° Moso bamboo microfibril angle with bamboo age the variation in Zhuqing and Shiraia of at a slight difference; addition to 2 years old Moso bamboo microfibril angle along the vertical height of greater volatility in the remaining age microfibril angle with the longitudinal height substantially stable trend; different bamboo age, vertical height The microfibril angle the radial variability are Zhuqing less than Shiraia. Based on the above studies, anatomy of the 4-year-old Moso bamboo material is superior to 1-year and 2-year-old Moso bamboo material corresponding anatomical performance from the pulp and paper point of view, should use 4-year-old the Moso bamboo wood as a papermaking raw materials. Different physical properties of Moso bamboo timber, bamboo age, studies have shown that: 1) Moso bamboo wall thickness of 6.70-7.88mm; basic density 0.49-0.73g/cm3; fully dry, air-dry volume shrinkage rates were 10.20% -17.41% 7.88% -14.91%; chord all dry, radial shrinkage rate of 5.13% -6.12% 4.92% -5.83%; air-dry chord, radial shrinkage rate of 3.95% -5.26% 3.66% -4.61 %. 2) wall thickness, basic density with bamboo age increases; gradually decreases along the longitudinal height from base to slightly Ministry, wall thickness, basic density gradually increased. 3) Moso bamboo wood shrinkage rate with bamboo age increase and reduce, 2-4 years, maintained at a stable level; Sui longitudinal height, in addition to all dry, air-dry radial shrinkage rate to increase slightly outside, the remaining the drying shrinkage indicators were tested decreasing. Based on the above studies, 4 year old Moso bamboo material physical performance is better than 1-year-old and 2-year-old Moso bamboo material corresponding performance indicators from the pulp and paper point of view, should use 4-year-old Moso bamboo material as a timber for paper making. Different Aged Moso bamboo wood pulping performance analysis show that: in the same pulping process conditions, the four-year-old Moso Bamboo brownstock highest rate, coarse slag the lowest rate, and the viscosity of the pulp, unbleached pulp brightness and Kappa values ??has certain advantages. Same bleaching conditions, considering the pulp brightness degradation extent of the damage suffered by the bleaching yield and gross bamboo cellulose fiber, 4-year-old Moso bamboo bleaching properties superior to 1-year-old and 2-year-old Moso bamboo. Tensile index, burst index and folding endurance indicators Mao Zhucheng pulp and paper piece four years, the production of paper products with the 4-year-old Moso bamboo material is entirely up to the the First grade bleached kraft pulp quality indicators provisions, even the level of the superior product. The different bamboo age Moso bamboo pulp and paper process the fiber morphological change: studies have shown that different bamboo age Moso bamboo material after cooking, after beating and bleaching in fiber length, width and aspect ratio of the more obvious changes, and the 4-year-old Moso bamboo material fiber morphology better than 1-year-old and 2-year-old the corresponding fiber morphology, indicating that 4-year-old Moso bamboo material is fine papermaking materials. Scanning electron microscopy conclusion: beating the fiber morphology before and after the change than cooking and bleached fiber morphology changes significantly, generally happens primary wall and get rid of the outer layer of the secondary wall fibers in the pulping process, the fibers of the absorbent swelling, fiber fibrillation and fiber transverse cut. These phenomena in the beating process often occur at the same time, just in a period of some fibers was relatively strongly.

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CLC: > Industrial Technology > Light industry,handicrafts > Paper Industry > Raw materials and auxiliary materials > Plant fiber > Moso bamboo , reed fibers
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