• Journal of the Korean Wood Science and Technology
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• 제41권6호
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• pp.559-565
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• 2013

목재사용량의 증가에 따라 목재의 화재안전성에 대한 요구가 높아지고 있다. 실내 사용 목재의 난연처리에 무기인계를 약제로 사용함으로써 환경에 대한 부담을 줄이면서 난연성능을 향상 시킬 수 있다. 수용성 약제를 가압 주입하여 목재 내 깊숙이 침투시키면 목재의 고유기능을 유지하면서 난연성능을 부여 할 수 있다. 난연제의 용탈을 억제하여 장기간 성능을 유지할 수 있는 장점도 있다. 저자들은 액상규산나트륨을 주약제로 하고, 붕산 및 인계 약제를 보조약제로 하여 목재 내로 약액을 주입하는 공정을 개발하였다. 이들 약제는 난연성능 외에 방부 및 방충성능을 지니는 약제가 포함되어 있어, 난연성능과 함께 목재 사용 시 노출될 수 있는 부후환경에서의 내후성능을 방미효력과 방부효력으로 평가하였다.

• Journal of the Korean Wood Science and Technology
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• 제42권1호
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• pp.41-48
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• 2014

국내산 저독성 목재보존제를 개발하기 위하여 저독성 살충제인 디노테프란과 살균제인 IPBC 및 프로피코나졸, 그리고 인체에 유해하지 않으며 살균력을 가지고 있는 정향오일을 일정 비율로 혼합하여 29종의 약제를 제조하였다. PDA 배지와 목재 시험편을 사용하여 이들 약제의 방곰팡이 효력을 조사하였다. 용제와 유화제는 방곰팡이 효력을 보이지 않아 조제 약제의 방곰팡이 효력은 4종의 유효성분에 의해 발현되는 것으로 판단하였다. PDA 배지 시험에서 비교적 높은 균사 생장 억제력을 보인 것은 IPBC의 함유 비율이 높은 약제였으며, 프로피코나졸은 IPBC에 비하여 상대적으로 낮은 방곰팡이 효력을 나타냈다. 많은 약제들이 PDA 배지 시험에서는 비교적 높은 균사 생장 저해성을 보였으나 목재 시험편 시험에서는 방곰팡이 효력을 나타내지 못했다. PDA 배지와 목재 시험편 시험에서 모두 완벽한 방곰팡이 효력을 나타낸 것은 3종에 불과하였으며 디노테프란과 IPBC로 구성된 약제와 여기에 정향 오일을 첨가한 약제뿐이었다.

• 한국약용작물학회지
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• 제23권6호
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• pp.473-479
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• 2015

Background : To control ginseng gray mold, farmers have mainly used inorganic chemical based fungicides. The recent emergence of fungicide resistance has reduced the effectiveness of such control methods. Such pesticides also carry additional problems, such as diffuse pollution. Methods and Results : Six treatments of organic agricultural materials were tested for control of ginseng gray mold, CAPW (Chrysophanic acid + Phytoncide + Wood vinegar), EmEWV (Emodin + Ethanol + Wood vinegar), CEWV (Curcumin + Eugenol + Wood vinegar), Bacillus subtilis, soybean oil and sulfur. The control effect for gray mold by a single application of the agrochemical fungicide industrial Fenhexamid wettable powder (WP) was 84.4%. The control effect by CAPW, EmEWV and CEWV varied between 52.7 - 64.9%. The control effect by B. subtilis, soybean oil, and sulfur were 32.9 - 59.2%. Conclusions : In the field tests, CAPW showed the highest control effects when used before, and at first stage of disease incidence, against ginseng gray mold.

• Journal of the Korean Wood Science and Technology
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• 제49권1호
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• pp.82-92
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• 2021

Nakdong technique is an unfamiliar scorching treatment using an iron heated in a kiln over 1000℃. It is a typical convention in Asian countries to treat Nakdong on the surface of paulownia species. The scorching treatment changes the surface characteristics as well as the color of the wood. This study focused on the effects of functional features such as water resistance, anti-mold, anti-termite, and sound improvement because this treatment is usually used on paulownia wood-bodied musical instruments surface. It took 28'57" for Nakdong-iron treated surface to absorb a droplet of water. The absorbance time of iron treated surface was longer than that of torch treated one. There was no noticeable effect on the anti-mold test. On the anti-termite test, there was nearly 3% more mean mass loss on the torch samples than controlled and iron treated ones. In examining the sound radiation coefficient before and after Nakdong treatment, the Nakdong-iron treated surface showed an increase in the average value of 1.2 m4/kg s, which means that it has sound quality improvement. Through this research, the Nakdong technique results are expected to be used as basic-data for further research and give a practical idea for using the traditional treatment method on the wood surface.

• Journal of the Korean Wood Science and Technology
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• 제23권1호
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• pp.42-48
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• 1995

The purpose of this study is to evaluate the efficacy of metabolites produced form Streptomyces rimosus in controlling the growth of sapwood - inhabiting fungi. In order to carry out this task, the following specific fungi were tested : sapstain fungi - Ceratocystis pilifera, Ceratocystis piceae, and Aureobasidium pullulans ; mold fungi - Trichoderma hazianum, Trichoderma viride, Penicillium cirtrinum, and Aspergillus niger. Based on the tests, the following observations can be drawn. 1. The conidial germination of sapstain and mold fungi was completely inhibited leaving a clear zone around the paper disc treated with metabolites. The best inhibition was observed in A. pullulans plate and the least in T. viride. 2. Concentration of SB medium for the production of metabolites from St, rimosus affected antifungal activity of metabolites against sapwood - inhabiting fungi. Metabolites prepared from 1/3${\times}$SB medium showed the best activity and the least activity was observed in metabolites form 1/4${\times}$medium. 3. in vivo and in vitro test using wood blocks, treatment of pine sapwood blocks with metabolites also inhibited conidial germination and thus prevented discoloration. 4. Treatment with metabolites did not change the macroscopic structure of wood and did not cause the discoloration of the surface of wood by pigments produced form St. rimosus. In conclusion the results of this study indicate that antifungal metabloites of St, rimosus could be used for the biological control of sapstain and mold fungi.

• Journal of the Korean Wood Science and Technology
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• 제35권2호
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• pp.79-84
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• 2007

Surface mold fungi growing on CCA-treated wood could be inhibited effectively by the incorporation of moldicide into treating solution. In this study, moldicides compatible with the CCA solutions from various commercial moldicides were screened, and then their optimum concentrations for controlling surface mold on CCA-treated radiata pine sapwood were examined through both the laboratory and the field trials. Among nine commercial moldicdes tested, two substituted isothiazolinones, moldicide A containing 2-n-octyl-4-isothiazoline-3-one and moldicide B containing 5-chloro-2-methyl-4-isothiazolin-3-one and 2-methyl-4-isothiazolin-3-one, were chemically compatible with CCA solution. The optimum concentration to be incorporated into 2% CCA treating solution was determined to be 0.001% for moldicide A and 0.003% for moldicide B.

• 한국가구학회지
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• 제15권1호
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• pp.9-16
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• 2004

Five type boxes manufactured from cement(A), wood panel(B), charcoal-packed wood panel(C), plywood panel(D) and charcoal-packed plywood panel(E) were prepared. Relationship of preservation characteristic of strawberry and relative humidity, and properties of thermal and sound insulations in the boxes were examined. During the experimental duration, relative humidity in the cement box was highest and lowest in the charcoal-packed wood panel box. Weight loss of strawberry was greatest in charcoal-packed wood panel box and very little in cement box. In the boxes with charcoal-packed wood panel box and very little in cement box. In the boxes with charcoal, strawberry was preserved for 10 days without getting mold, but in cement box it was covered with mold in 3 days. The charcoal-packed boxes showed higher thermal insulation property than the cement box. There were no significant differences in the property of sound insulation among the 5 type boxes. Consequently, it is suggested that charcoal-packed wood panels can be used for a better ecomaterial.

• Journal of the Korean Wood Science and Technology
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• 제25권4호
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• pp.92-98
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• 1997

To make good use of chitosan forming complex with heavy metals in wood preservative treatment, woods impregnated with chitosan and copper sulfate were prepared. Amounts of leached copper, decay resistance, anti-mold efficacy, iron corrosion rates, moisture regain rates and degradation pattern in chitosan pre-treated and untreated wood were compared. After leaching test, amounts of leached copper from chitosan pre-treated wood had a much smaller than chitosan untreated wood, and good decay resistance was retained even after leaching test. From these results, it was proved that chitosan-copper complex formed in wood played and important role for decay durability. In chitosan pre-treated wood, damage values by test molds became remarkably smaller, but the growth of test molds was not perfectly inhibited. Distinct differences in iron corrosion rates between chitosan pre-treated and untreated woods was not recognized but chitosan pre-treated wood showed the lower moisture regain rates than chitosan untreated wood because of water insoluble chitosan membrane formed in wood. After leaching test, the tracheid walls in the wood treated with 2.0% copper sulfate only were eroded by the fungal attacks, but those in the wood pre-treated with chitosan remained almost intact.

• Journal of the Korean Wood Science and Technology
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• 제47권3호
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• pp.336-343
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• 2019

Effects of a novel mold inhibitor specifically for bamboo, on the properties of composite products have been confirmed in this study. The mechanical and dimensional stability properties of bamboo fiber-based composites (BFBCs) from different bamboo species were also investigated. The results showed that Burmanica Gamble possessed the highest values of modulus of elasticity (MOE) of 33.2 GPa, modulus of rupture (MOR) of 286.9 MPa, compressive strength of 182.6 MPa and shear strength of 24.0 MPa. By contrast, Phyllostochys heterocycla among all of species showed the lowest MOE of 16.3 GPa, MOR of 170.3 MPa and compressive strength of 128.9 MPa were the lowest among all of species. Moreover, there is a remarkable variation in the swelling and water absorption between the samples with 4 h and 28 h water immersion treatment, especially Phyllostachys iridenscens. Overall, the results suggested that TCIT (Tebuconazole and 3(2H)-isothiazolone) had no significant effect on the mechanical properties compared with the control condition, and it would be utilized as an antimould of BFBCs manufacturing.

• Journal of the Korean Wood Science and Technology
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• 제32권2호
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• pp.73-81
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• 2004

저가의 국내산 목재 방미제의 개발을 목적으로 산업부산물인 플루오르화암모늄(NH₄F)으로부터 합성한 6종의 플루오르화합물계 약제를 사용하여 목재에 오염을 일으키는 표면오염균의 생장억제 효과, 소나무, 잣나무 및 라디에타소나무에 대한 목재 방미효력, 목재의 철부식성 및 흡습성에 미치는 영향을 조사하였다. 합성 약제 중에서 주요 성분이 F와 Cu인 RNF-3과 F 단독인 RNF-4가 처리 PDA 배지 및 목재에서 보존 균주의 생장이 전혀 이루어지지 않아 가장 우수한 균의 생장 억제 및 목재 방미효력을 가지고 있는 것으로 밝혀졌다. 이들 약제의 최적 처리 농도는 2%인 것으로 판단되었으며 목재 수종에 따른 방미효력 차이는 거의 나타나지 않았다. 약제 처리 목재는 높은 철부식비를 보였으며 이것은 약제 중에 함유되어 있는 F의 강한 부식성에 기인한 것으로 판단되었다. 그러나 농도 2% 이하의 RNF-3과 RNF-4를 처리한 목재의 철부식비는 무처리와 큰 차이를 보이지 않았다. 또한 합성 약제가 목재 흡습성에 미치는 영향은 없는 것으로 나타났다. 이들 약제의 실용화 검토를 위해서 침엽수 제재목 생산 현장에서의 야외 시험 등 추가적인 연구가 필요할 것으로 사료된다.