紫外辐射对蒸Alder木材颜色的影响

IF 0.7 4区 农林科学 Q4 MATERIALS SCIENCE, PAPER & WOOD
L. Dzurenda, Michal Dudiak
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引用次数: 1

摘要

桤木(Alnus glutinosa L.)用饱和蒸汽-空气混合物在t = 95℃下蒸煮,或在t = 115℃和t = 135℃下蒸煮,得到浅棕色、浅红棕色和深棕色。随后,将未蒸和蒸过的桤木样品干燥后,在Xenotest Q-SUN Xe-3-HS中用紫外灯照射,测试蒸过的桤木的颜色稳定性。通过颜色空间CIE L*a*b*坐标上的测量值来评价木材表面的颜色变化。结果表明,未蒸制桤木、蒸制桤木在95℃蒸汽-空气混合物和115℃饱和蒸汽条件下的表面由于紫外线辐射引起的光化学反应而变暗变褐。在温度为t = 135℃的饱和蒸汽蒸煮的桤木表面,记录了相反的趋势,在紫外线辐射的影响下,深棕色-灰色变浅为棕红色阴影。对色彩空间CIE L*a*b*坐标变化的分析表明,蒸熟桤木的变暗、褐变越大,蒸熟桤木的UV辐射对其ΔL*、Δa*、Δb*值的变化越小。蒸煮对抗紫外线的积极作用可以通过降低整体色差ΔE*来证明。紫外光照射下未蒸煮桤木的总色差为ΔE* = 10.9,而95℃蒸汽-空气混合蒸煮桤木的总色差为ΔE* = 8.7,降低了20.2%;在t = 115℃蒸熟的桤木,它下降到ΔE* = 6.5,下降了40.3%;温度t = 135℃,饱和水蒸汽蒸制的桤木,其温度降至ΔE* = 5.7,降低了47.7%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Colour Change of Steamed Alder Wood Caused by UV Radiation
Alder wood (Alnus glutinosa L.) was steamed with a saturated steam-air mixture at a temperature of t = 95 °C, or saturated steam at t = 115 °C and t = 135 °C to obtain a pale brown colour, a light red-brown colour and a dark brown-grey colour. Subsequently, samples of unsteamed and steamed alder wood were irradiated with a UV lamp in a Xenotest Q-SUN Xe-3-HS after drying in order to test the colour stability of steamed alder wood. The colour change of the wood surface was evaluated by means of measured values on the coordinates of the colour space CIE L*a*b*. The results show that the surface of unsteamed alder wood as well as steamed alder wood with a steam-air mixture at t = 95 °C and saturated steam at t = 115 °C darkened and browned due to photochemical reactions caused by UV radiation. The opposite tendency was recorded at the surface of alder wood steamed with saturated steam with a temperature of t = 135 °C, where the deep dark-brown-grey colour lightened to a brown-reddish colour shade under the influence of UV radiation. The analysis of the changes in the coordinates of the colour space CIE L*a*b* shows that the greater the darkening and browning of the alder wood by steaming, the smaller the changes in the values of ΔL*, Δa*, Δb* of the steamed alder wood caused by UV radiation. The positive effect of steaming on UV resistance is evidenced by the decrease in the overall colour difference ΔE*. While the value of the total colour difference of unsteamed alder wood caused by UV radiation is ΔE* = 10.9, it decreased to ΔE* = 8.7 for alder wood steamed with steam-air mixture at t = 95 °C, which is a decrease of 20.2 %; for alder wood steamed at t = 115 °C it decreased to ΔE* = 6.5, which is a decrease of 40.3 %; and for alder wood steamed with saturated water steam with the temperature t = 135 °C it decreased to ΔE* = 5.7, which is a decrease of 47.7 %.
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来源期刊
Drvna Industrija
Drvna Industrija MATERIALS SCIENCE, PAPER & WOOD-
CiteScore
1.80
自引率
9.10%
发文量
32
审稿时长
>12 weeks
期刊介绍: "Drvna industrija" ("Wood Industry") journal publishes original scientific and review papers, short notes, professional papers, conference papers, reports, professional information, bibliographical and survey articles and general notes relating to the forestry exploitation, biology, chemistry, physics and technology of wood, pulp and paper and wood components, including production, management and marketing aspects in the woodworking industry.
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