• Journal of the Korean Wood Science and Technology
• /
• 제48권1호
• /
• pp.1-11
• /
• 2020

Indonesian log production is dominated by young trees harvested from plantation forests. The timber contains of sapwood and juvenile wood, which are not resistant to termite attack. Smoking treatment can enhance wood resistance to termite attack, but it also changes the color. Specimens of mangium (Acacia mangium) and sengon (Falcataria moluccana) wood were exposed for 1, 2, and 3 weeks to smoke produced from the pyrolysis of salam (Syzygium polyanthum) wood. The color change of the wood was measured using the CIELab method. In addition, wood specimens were exposed to subterranean termites (Coptotermes curvignathus Holmgren) under laboratory conditions. Untreated and imidacloprid-preserved wood samples were also prepared for comparison purposes. The results showed that the color of smoked wood differed from that of untreated wood, and the color change for sengon was greater than for mangium. In addition, the 1-week smoking period changed the wood color less than the 2- and 3-week periods, which did not differ. Imidacloprid-preserved wood had distinctive color changes compared to untreated wood. Untreated mangium wood had moderate resistance to subterranean termite attack (resistance class III), while sengon had very poor resistance (resistance class V). Salam wood smoke enhanced wood resistance to termite attack, and smoke treatment of 1 week for mangium and 2 weeks for sengon resulted in the wood becoming very resistant (resistance class I). Both types of smoked wood were more resistant to subterranean termite attack than imidacloprid-preserved wood (average class II resistance).

• Journal of the Korean Wood Science and Technology
• /
• 제43권2호
• /
• pp.265-273
• /
• 2015

In general, when wood products are used outdoors for a certain period of time the surface color of wood changes due to light, water, heat and so on. This color change can be considered importantly for the product's market value. In this study, the color change of ACQ (Alkaline Copper Quaternary) and CBHDO (CuO $H_3BO_3$ N-cyclohexyldiazenium-anion) treated wood and untreated wood was investigated during 2-year weathering test. From this experimental study, it was found that the colors of the treated wood changed more reddish and yellowish from green. Meanwhile, the untreated wood turned to grey color rapidly. Also, the color of the treated wood in short-term exposure changed closer to the inherent color of the fresh natural wood than that of the untreated woods.

• 한국가구학회지
• /
• 제25권3호
• /
• pp.223-232
• /
• 2014

To make metalized wood composites of 10 different korean wood species, it was tested by Low temperature melting Bi-Sn alloy injection method at high temperature and high pressure condition. Metalized wood composite of each wood species had light ash color, but still maintained its own natural wood grain and wood figures. It was evaluated on coating properties. Furthermore, it also was check on effect of coating as like a changes of main color, wood grain and wood figures. The results of test were following as; a coating properties as like a cold resistance, heat resistance, acid resistance, alkali resistance, durability of abrasion, and cross-cut test was proper on the conditions of the KS standard. And, In aspect of color changes, the metalized wood composites of 10 different korean wood species had a light ash color, but still maintained its own natural wood grain and wood figures. Also, the more weight per gain of alloy is, the more grey background of metalized wood composite is.

• 한국염색가공학회지
• /
• 제25권4호
• /
• pp.314-326
• /
• 2013

The purpose of this research is to analyze the effects of Dansam and Sappan wood extract to perform combination dyeing on silk fabrics, with respect to color changes, fastness (washing, dry cleaning, perspiration, rubbing and light fastness), and functionality (antibacterial activity and deodorization). Combination dyeing was performed by first combining Dansam with Sappan wood, then Sappan wood with Dansam, in these orders. Given the changes in the combination ratio, pre-mordant treatment was performed. Looking at the surface colors of each dye, Dansam generally produces YR color series, while Sappan wood produces YR, R, and RP color series. The effects of changing the order in which combination dying was performed on the surface colors were as follows. First, combination dyeing (A) was performed by using Dansam before Sappan wood, to produce YR and R color series. Then combination dyeing (B) was performed by using Sappan wood before Dansam, to produce YR, R, and RP color series. By visual inspections, more similar color changes of the combination dyeing were noticed with the post-dyeing material rather than the pre-dyeing material. Therefore, it was presumably confirmed that surface color changes of combination dyeing were greatly influenced by the post-dyeing color. Individual dyeing tests for fastness showed that Dansam was comparatively superior to Sappan wood, which demonstrated lower fastness to washing, dry cleaning, perspiration, and light, relatively. The fastness of combination dyed samples was shown middle, but similar fastness to the post-dye material, The fastness of (B) method was higher than (A) method in the washing and light fastness. This confirms that color fastness from combination dyeing was considerably influenced by the post-dye material. It was found that all dyed samples had a very high bacterial reduction rate of 99.9% and high deodorization rate of 95%.

• 한국가구학회지
• /
• 제21권5호
• /
• pp.413-423
• /
• 2010

The study has been carried to evaluate the wood color, a typical element of visual and decorative effect, for seven major domestic softwoods using L*a*b* and chrominance ($\Delta$E*ab). The result showed that the values of whiteness, redness, and yellowness were positive at both sapwood and heartwood and there were no wood having a small chrominance difference ranged 0~0.5. There was also no wood having a chrominance difference ranging 0.5~3.0. Ginkgo biloba, Pinus koraiensis, and Larix kaempferi wood showed a little different chrominance, Taxus cuspidata, Pinus densiflora for. erecta, and Pinus densiflora wood substantial different chrominance, Juniperus chinensis wood largest different chrominance. It is concluded that the study results could be utilized as a data base in areas of wood craft and furniture and could open a way to substitute foreign imported woods.

• Journal of the Korean Wood Science and Technology
• /
• 제39권3호
• /
• pp.238-243
• /
• 2011

라디에타 소나무(Pinus radiata D.Don) 열압밀화 목재의 압밀화 시간과 온도에 따른 재색의 변화를 관찰하였다. 색차계를 이용하여 재색을 측정하였으며, NBS (National Bureau of Standards)에 의해 색차를 평가하였다. 그 결과 압밀화 온도의 증가에 따라 백색도는 감소하였고, 적색도와 황색도는 증가하였다. 그리고 대부분의 색차는 'Very Much (대단한 차)'로 나타났다. 압밀화 시간의 증가에 따른 재색의 변화는 압밀화 시간의 증가에 따라 백색도는 감소하였으나 감소폭은 온도에 의한 영향보다 적은 것으로 나타났다. 적색도와 황색도에 미치는 열 압밀화 시간의 영향은 미약하였다. 즉 압밀화 가열온도와 가압시간의 증가에 따라 재색의 암색화가 나타났으며, 재색변화에는 압밀화 시간보다 가열온도의 영향이 더욱 큰 것으로 나타났다.

• Journal of the Korean Wood Science and Technology
• /
• 제48권3호
• /
• pp.315-325
• /
• 2020

Boron compound had many advantages as wood preservative, but it was prone to leaching. Improving boron preservation was required to extend the service life of fast growing and low durability red jabon (Antochephalus macrophyllus) hardwood. This study aimed to evaluate the dimensional stability, color change and durability of modified red jabon wood by double impregnation with boron and methyl methacrylate (MMA) and heat treatment. Impregnation I used boric acid or borax, and impregnation II used MMA, while heat treatment used temperatures of 90 ℃ or 180 ℃ for 4 hours. The dimensional stability, leachability, water absorption, color change and decay resistance of modified red jabon wood were tested. The results showed that MMA impregnation increased the dimensional stability of red jabon wood, while the leaching and water absorption in the wood significantly reduced. Heating at 180 ℃ caused less water absorption and higher dimensional stability of the wood than that of heating at 90 ℃. Impregnation with boric acid and MMA followed by heating at 90 ℃ resulted in the highest wood ASE, 89.9%. The color change (∆E^*) of wood increased significantly after MMA impregnation and heating at 180 ℃. Boric acid impregnation caused more resistant wood than borax impregnation against decay fungi and termites. Impregnation with boric acid and MMA followed with heating at 180 ℃ increased significantly the wood resistance against decay fungi and termites.

• Journal of the Korean Wood Science and Technology
• /
• 제20권4호
• /
• pp.85-102
• /
• 1992

• 한국의상디자인학회지
• /
• 제14권4호
• /
• pp.151-162
• /
• 2012

Regarding experimental study on the dyeing properties of natural dye, I have dyed silk fabric with Styphnolobium japonicum, sappan wood, and indigo. The results of the experiment have been analysed by wavelength of maximum absorption, K/S and CIE Lab chromaticity co-ordinated. The results are as follows: In case of complex dyeing using Styphnolobium japonicum and sappan wood, dyeing with sappan wood, which is red related color, after dyeing with Styphnolobium japonicum, which is yellow related color, is more efficient. When dyeing was maden by complex of Styphnolobium japonicum and sappan wood, Dyeing method by the order of "Styphnolobium japonicum${\rightarrow}$sappan wood${\rightarrow}$mordanting" made the best result of complex dyeing. In case of complex dyeing using Styphnolobium japonicum and Indigo, dyeing with Styphnolobium japonicum after the indigo made the best result. When dyeing with indigo first, and then Styphnolobium japonicum, yellow color was not well dyed, and low level of saturation caused lusterless color. Ordering of Styphnolobium japonicum${\rightarrow}$sappan wood${\rightarrow}$indigo made the best result of complex dyeing in case of complex dying with Styphnolobium japonicum and indigo. Dyeing order, sappan wood first and then indigo last method shown 560~640 nm wavelength of maximum absorption which most color was blue related. In contrast, Indigo first and then sappan wood method shown 460~560nm wavelength of maximum absorption which color was red related. Complex dyeing with sappan wood and indigo was showing lusterless color. In case of dyeing with red and blue, dyeing with sappan wood and indigo was not appropriate.

• 한국가구학회지
• /
• 제26권3호
• /
• pp.262-266
• /
• 2015

This study was carried out to analyze the surface color change according to the weathering time. The surface color of material was one of evaluation indexes in exposure experiment. For the purpose, accelerated weathering test was performed with wood. The weathering time level was composed with 0, 500, 1000, 1500 and 2000 hours and color difference was estimated with the color difference meter. The surface color was changed to 500 hours that lightness and redness were decreased and yellowness was increased. However it did not changed after 500 hours. It means that the surface color could be the evaluation index of deterioration of the wood but it means very little after certain time.