南京林业大学[017].doc

南京林业大学
本科毕业设计(论文)
题目:不同胶种对等离子处理钝化杨木单板胶合性能的影响
学院: 木材工业学院
专业: 木材科学与工程
学号: 070401317
学生姓名: 吴臻
指导教师: 黄河浪
职称: 教授
二O一一年五月二十五日
摘要
本研究采用不同温度干燥的杨木单板,测定干燥过程中杨木单板表面颜色的变化以及钝化前后单板表面形貌的变化。采用低温等离子对钝化杨木单板、气干单板进行处理,与未处理的钝化单板和气干单板进行对比,考察等离子对以上不同杨木单板胶合性能的影响;选取UF、PF两种胶黏剂,考察不同胶种对等离子处理钝化杨木单板胶合性能的影响。结果表明:在相同的干燥温度下,随干燥时间的增加,杨木单板表面明度降低,颜色朝向偏红、偏黄的方向发展,相同干燥时间下,随干燥温度的增加这种变化趋势更加明显;钝化杨木单板经低温等离子体处理后,Ⅰ %,Ⅱ %,因此,低温空气等离子体处理能改善钝化杨木单板的表面特性,提高其胶合强度,且对于Ⅱ类胶合板胶合强度提高更加显著。
关键字:UF;PF;低温空气等离子体;钝化单板;颜色;胶合强度
ABSTRACT
In this study, started with the color changing regulation and the change of form of poplar veneer surface with different dying temperature and time, figure out the rational t-echnology of passivated veneer. Contrasted with air-dried veneer, the paper also studies t-he bonding strength of passivated veneer before and after the treatment of the low-temp-erature plasma. With the usage of two kinds of glues-UF and PF, the study inspects the influence on the bonding property of poplar veneer. The result indicated that in the sa-me dying temperature, the color of the veneer surface es darker, more red and ye-llow with time passing by. The trend es obvious with higher temperature. The ave-rage increase of the bonding strength of typeⅠplywood is % while type Ⅱ plywo-od is %, therefore, an average of low-temperature air plasma treatment can impro-ve the surface properties of passivated poplar veneer, improving its bonding strength, andthe improvement of type Ⅱ plywood is more remarkable.
KEYWORDS: UF; PF; Low-temperature Plasma; Passivated poplar veneer; Color; B-onding strength
目录
1前言 1
1
1
2
4
5
5
5
2单板钝化研究 7
7
7
7
8
8
干燥过程中单板表面红绿轴色品指数的变化 9
10
11
12
3不同胶种对等离子处理钝化杨木单板胶合性能影响的分析 13
13