文献类型：期刊文献

中文题名：杉木目测分等规格材缺陷类型及分布的研究

英文题名：Study on Types and Distribution of Visual Characteristics about Chinese Fir Dimension Lumbers

作者：郭伟[1,2] 任海青[2] 殷亚方[2]

第一作者：郭伟

通信作者：Ren, H.-Q.

机构：[1]国家林业局北京林业机械研究所;[2]中国林业科学研究院木材工业研究所

年份：2009

卷号：12

期号：4

起止页码：462-465

中文期刊名：建筑材料学报

外文期刊名：Journal of Building Materials

收录：CSTPCD;;EI(收录号：20093912337963);Scopus(收录号：2-s2.0-70349185133);北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：科技部基础条件平台项目;国家林业局948项目((2004-4-55);(2006-4-98)和(2006-C-04))

语种：中文

中文关键词：目测分等;人工林杉木;规格材;降等缺陷

外文关键词：visual grading; Chinese fir plantation; dimension lumber; grade reduction defect

分类号：TU531.1

摘要：采用加拿大分等规则（NLGA），分别对安徽、湖南、四川、福建所出产的横截面尺寸为45mm×90mm，总计1581根人工林杉木规格材外观质量进行评估。研究表明：各产地杉木规格材分等结果略有不同，节子、钝棱、漏刨、腐朽、斜纹理是杉木规格材5种最常见的降等缺陷，其中节子对其目测等级影响最大；82.8％No.1等级的杉木规格材降等由节子引起，86.4％No.2等级的杉木规格材降等由钝棱、漏刨、节子造成。鉴于此，建议采用胸径适中（15-18cm）的杉木生产规格材，并进一步研究和改进下锯方法和加工工艺；优化分等规则，避免使用胸径过大的杉木生产规格材。
The visual characteristics of Chinese fir dimension lumbers was evaluated, and the research on log sawing process and the optimization of dimension lumbers were conducted. The lumbers were graded according to National Lumber Grading Authority-standard grading rules for Canadian lumber（NLGA）, and the sample trees were collected from Anhui, Hunan, Sichuan and Fujian provinces. The cross section of specimens was 45 mm）〈90 mm, and the amount of the lumber was 1 581. The results are shown and analyzed palpably by percentage and histogram. The results show that there is a little difference among the results of each plantation areas. Knots, wane, skips, decay and slope of grain are the main defects causing the lumber to be degraded, and especially the knots are the key factor to visual characteristics of dimension lumbers; 82.8% of the dimension lumbers degraded from grade SS to grade No. 1 are related to knots, and 86.4- of the dimension lumbers degraded from grade No.1 to grade No. 2 are due to wane, skips and knots. It is necessary to research on log sawing, optimize lumber grades and adjust the grading rules for the dimension lumbers produced from the diameter at breast height （DBH） of 15-18cm.