COLOR STABILITY OF WEATHERED HEAT-TREATED TEAK WOOD

被引：32
|
作者：
Garcia, Rosilei Aparecida [1 ]
Lopes, Juliana de Oliveira [1 ]
do Nascimento, Alexandre Miguel [1 ]
de Figueiredo Latorraca, Joao Vicente [1 ]
机构：
[1] Fed Rural Univ Rio de Janeiro UFRRJ, Forest Inst, Dept Forest Prod, BR-23890000 Rio De Janeiro, Brazil
来源：
MADERAS-CIENCIA Y TECNOLOGIA | 2014年 / 16卷 / 04期
关键词：
CIE-Lab system; heat treatment; ultraviolet radiation; EXTRACTIVES; PHOTODEGRADATION; RESISTANCE; RADIATION; HEARTWOOD; EXPOSURE;
D O I：
10.4067/S0718-221X2014005000037
中图分类号：
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号：
0805 ; 080502 ; 0822 ;
摘要：
This study investigated the color stability in a heat treatment of teak wood (Tectona grandis) exposed to ultraviolet radiation under accelerated aging conditions. Nine trees from three different spacing levels were used. Samples of 150 mm x 75 mm x 20 mm were prepared and divided into two groups: heartwood and sapwood. Two levels of heat treatment (180 and 200 degrees C) were used. The color was measured every 42 hours with a portable spectrophotometer using the CIE-Lab system. Accelerated aging was performed in a QUV/Spray chamber. The total cycle of exposure to ultraviolet radiation was of 168 hours at 340 nm. Tree planting spacing had no effect on color change after ultraviolet radiation. Untreated sapwood had greater color change than untreated heartwood. However, after heat treatment, sapwood showed high color stability, especially at a temperature of 180 degrees C.
引用
收藏
页码：453 / 462
页数：10
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