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首页> 外文会议>Kraft pulp yield: a TAPPI Press anthology of published papers for the period of 1990-2001 >KRAFT PULP FROM NORWAY SPRUCE (PICEA ABIES) Thinned at 30 Years Age
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KRAFT PULP FROM NORWAY SPRUCE (PICEA ABIES) Thinned at 30 Years Age

机译：来自挪威云杉的牛皮纸浆（PICEA ABIES）在30岁时变薄

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摘要

This study illustrates the influence of growth rate on the kraft pulprnproperties of 30 to 35-year-old Norway spruce (Picea abies)rnremoved during a thinning. Wood from the fastest growing standrnhad a mean annual ring width of 5.6 mm and a mean basic densityrnof 323 kg/m3, whereas corresponding values for the slowestrngrowing stand were 2,9 mm and 384 kg/m3, respectively. Thernremaining stands had intermediate ring widths and basic densities.rnProcess and pulp characteristics were found to be similar for woodrnfrom stands with a mean annual ring width between 3 mm and 4rnmm and a mean basic density ranging from 350 to 400 kg/m3.rnWood from the stand with a mean ring width exceeding 5 mm andrna mean basic density of 323 kg/m3 had shorter fibers and longerrncooking time to reach a certain kappa number, compared withrnwood from the other stands. Furthermore, this wood consumedrnmore chemicals and yielded l-2 percentage units less pulp. Thernvolume of wood needed to produce, 1 ton of pulp was 6.4 m forrnthe fastest growing trees and 5.2 m3 for the slowest growing ones.
机译：这项研究说明了生长速度对30到35岁挪威云杉（Picea abies）稀疏期间去除的牛皮纸浆性质的影响。生长最快的林分的年轮平均宽度为5.6 mm，平均基本密度为323 kg / m3，而生长最慢的林分的相应值分别为2.9 mm和384 kg / m3。其余的林分具有中等的环宽度和基本密度。rn发现林的工艺和纸浆特性相似，年生环平均宽度在3 mm至4rnmm之间，平均基本密度在350至400 kg / m3之间。与其他林木相比，平均环宽超过5毫米的林木，平均基本密度为323 kg / m3的纤维较短，煮熟时间达到一定的卡伯值。此外，这种木材消耗了更多的化学物质，并减少了1-2％的纸浆。生产一吨木浆所需的木材量为：生长最快的树木为6.4 m，生长最快的树木为5.2 m3。

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