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DISCOLORATION OF OAK VENEER INDUCED BY METAL IONS 金属离子对橡木单板变色的影响
IF 1.3 4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-04-26 DOI: 10.37763/wr.1336-4561/68.2.224240
Huachun Qi, Xiangrui Li, Mingli Liu, Chunfeng Li
The 3 mm thick oak veneers were discolored by single ions of Fe2+, Cu2+, and Mn2+ and mixed ions of Fe2+-Cu2+, Fe2+-Mn2+, and Cu2+-Mn2+. The brightness (L*), red-green index (a*), and yellow-blue index (b*) of the veneers changed by varying degrees with the changes in ion mass fraction, temperature, heating time, ion species, and ion mass fraction ratio. The maximum values of total color difference (△E*) of the veneers were 38.94, 11.79, and 9.42 for Fe2+, Cu2+, and Mn2+. Moreover, the total color difference (△E*) values of 24.07, 13.71, and 4.45 were observed for Fe2+-Cu2+, Fe2+-Mn2+, and Cu2+-Mn2+ mixed ions. The veneers showed different degrees of vibrational peaks after discoloration. According to the ultraviolet spectrum, Fe2+ had a red shift in the ultraviolet absorption band of the unsaturated carbonyl compound and benzene ring compound. Moreover, the dark effect of Fe2+, Fe2+-Cu2+, Fe2+-Mn2+, Mn2+, Cu2+-Mn2+, and Cu2+ gradually decreased. The surface of the veneer was flat, without any rupture or deformation, and the pores were clear after treatment.
3mm厚的橡木单板被Fe2+、Cu2+和Mn2+的单一离子以及Fe2+-Cu2+、Fe2+-Mn2+和Cu2+-Mn2+的混合离子变色。单板的亮度(L*)、红绿指数(a*)和黄蓝指数(b*)随着离子质量分数、温度、加热时间、离子种类和离子质量分数比的变化而发生不同程度的变化。总色差的最大值(△对于Fe2+、Cu2+和Mn2+,贴面的E*)分别为38.94、11.79和9.42。此外,总色差(△E*)值分别为24.07、13.71和4.45。单板变色后出现不同程度的振动峰。根据紫外光谱,Fe2+在不饱和羰基化合物和苯环化合物的紫外吸收带上有红移。此外,Fe2+、Fe2+-Cu2+、Fe2+-Mn2+、Mn2+、Cu2+-Mn2+Cu2+的暗效应逐渐减弱。单板表面平整,没有任何断裂或变形,处理后孔隙清晰。
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引用次数: 0
SHORT NOTES: FIRST REPORT OF THE LIGNIVOROUS FUNGUS PAECILOMYCES MAXIMUS IN CEDRUS ATLANTICA M. IN MOROCCO 简记:摩洛哥大西洋玉髓中嗜木质真菌最大拟青霉的首次报道
IF 1.3 4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-04-26 DOI: 10.37763/wr.1336-4561/68.2.403412
Oussama Chauiyakh, E. El Fahime, Oumaima Ninich, Samar Aarabi, Mustapha Bouziani, A. Chaouch, Aziz ET TAHIR
This study is interested in isolating fungi from the wood parts of cedar trunks withered and identifying these lignivorous fungi. A sample was isolated from the cedar grove of Tazekka National Park located south of the city of Taza in Morocco. The culture and purification of the isolated fungus were done on a water agar medium and then on a PDA medium. After the purification of the fungus, a morphological study by scanning electron microscope allowed us to identify the pathogen Paecilomyces. A molecular characterization identified Paecilomycesmaximus with a coverage percentage of 99% and an identity of 98.77%. To our knowledge, this is the first report of P. maximus in decayed cedar wood.
本研究对从雪松树干枯枝中分离真菌并鉴定这些木质素食用菌感兴趣。样本是从位于摩洛哥塔扎市南部的塔泽卡国家公园的雪松林中分离出来的。分离真菌的培养和纯化分别在水琼脂培养基和PDA培养基上进行。纯化后的真菌,通过扫描电镜形态学研究,使我们能够识别病原体拟青霉。分子鉴定鉴定出最大拟青霉(Paecilomycesmaximus),盖度为99%,鉴定度为98.77%。据我们所知,这是第一次报道在腐烂的雪松木中发现大孢子虫。
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引用次数: 1
PREDICTION OF EFFICACY OF DEACIDIFICATION PROCESS 脱酸工艺效果预测
IF 1.3 4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-04-26 DOI: 10.37763/wr.1336-4561/68.2.306319
K. Vizárová, Soňa Malečková, M. Jablonský, Štefan Varga, F. Kačík, S. Katuščák
The aim of this work is to propose the first model hypothesis and function for predicting the efficacy of deacidification. We have used the dDEA as the first basic factor influencing the efficacy. The resulting relationship is based on the best achieved reliable η data and related dDEA data, from mass deacidification technologies used for the lifetime and usability increase of millions of books, historical documents worldwide. The resulting η predicting function is as follows η = 0.732984+0.125612*dDEA^(-0.214237). This first 1D function can serve as an impulse for continuing improvement of the prediction, and 2D, 3D and multidimensional models. It can be used for comparisons and connecting η with η-characteristic mechanical, physical, cellulose solution properties; the prediction can serve for continuing improvement of efficacy of the conservation technology in increasing the paper carriers of information, documents longevity and usability.
本工作的目的是提出第一个预测脱酸效果的模型假设和函数。我们将dDEA作为影响疗效的第一个基本因素。由此产生的关系是基于最佳实现的可靠η数据和相关的dDEA数据,这些数据来自全球数百万本书籍和历史文献的使用寿命和可用性增加所使用的大规模脱酸技术。得到的η预测函数如下η=0.732984+0.125612*dDEA ^(-0.214237)。第一个1D函数可以作为继续改进预测以及2D、3D和多维模型的推动力。它可用于比较和连接η与η——特性机械、物理、纤维素溶液性质;该预测有助于继续提高保存技术在增加纸张信息载体、文件寿命和可用性方面的功效。
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引用次数: 0
MODEL CONSTRUCTION AND MICROWAVE PREHEATING EXPERIMENTS USING FIBERBOARD 纤维板模型构建及微波预热实验
IF 1.3 4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-04-26 DOI: 10.37763/wr.1336-4561/68.2.389402
Chunmei Yang, Zanbin Zhu, Jiuqing Liu, Bo Xue, Yucheng Li
Microwave heating is a new type of pre-heating for fiberboard mats. Compared to conventional heating, microwave heating is faster and the surface and interior are evenly heated, thus avoiding the phenomenon of premature hardening of the surface layer of the fibreboard mats. In this paper, the heat transfer law of microwave preheated fiberboard mats was analyzed, and a thermodynamic model of fiberboard microwave heating was established. Furthermore, a microwave preheating simulation was established through COMSOL software; the temperature distribution of the fiberboard after microwave heating was analyzed and the reliability of the simulation model was verified through experiments. The temperature changes of fibers in the two preheating methods were compared by direct contact preheating experiment and microwave preheating experiment. Microwave preheating is more efficient than direct contact preheating, and more uniform temperature distribution in fiberboard mats. The core layer temperature is higher than the surface layer temperature, which can shorten the preheating time. By comparing the COMSOL model with the test, the model can basically reflect the temperature change law of microwave preheating, and the temperature of each layer of the slab is more uniform in the model simulation process. The heating law of the fiberboard was obtained, which provided a theoretical reference for the industrialized microwave preheating of fiberboard.
微波加热是纤维板毡的一种新型预热方式。与传统加热相比,微波加热更快,表面和内部受热均匀,避免了纤维板毡表层过早硬化的现象。分析了微波预热纤维板毡的传热规律,建立了纤维板微波加热的热力学模型。此外,通过COMSOL软件建立了微波预热仿真;分析了微波加热后纤维板的温度分布,并通过实验验证了模拟模型的可靠性。通过直接接触预热实验和微波预热实验比较了两种预热方式下纤维的温度变化。微波预热比直接接触预热更有效,并且纤维板垫中的温度分布更均匀。芯层温度高于表层温度,可以缩短预热时间。通过将COMSOL模型与试验进行比较,该模型能够基本反映微波预热的温度变化规律,并且在模型模拟过程中,板坯各层的温度更加均匀。得出了纤维板的加热规律,为纤维板的工业化微波预热提供了理论参考。
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引用次数: 1
TECHNOLOGY OF PARTICLEBOARD’S PREPARATION BY COLD PRESSING AFTER HOT MAT COMPRESSION 刨花板热垫压缩后冷压制备工艺
4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.704717
HENRICH LÜBKE, VLADIMÍR IHNÁT
The article describes amethod of preparing particleboards (PB) from fresh and recycled chips by anew technology of cold pressing after hot compression of the mat according to PCT/SK2023/000007 (ÚPV SR, 13.06.2023) using polyvinyl acetate (PVAc) glue. Forcomparison, the experiment was also carried out using urea formaldehyde (UF) glue and their mutual combination. The new method shortens hot pressing, or causes reduction of pressing temperatures, while the prepared PB released from pressure no longer spring and cure over time. The curing kinetics of both PVAc and UF adhesives were described by monitoring the flexural strength and modulus of elasticity of PB as a function of time after release of pressure.Modeling of the PB pressing process based on PVAc glue, which consists of overheating the pressed cross-section of the board to 90°Cand its subsequent cooling to a temperature when the board is already stable, i.e. below a temperature of 70°C, was carried out using of a hot and cold press, while the pressing cycle lasted 140 s. Shortening the pressing cycle to 100 s was achieved by applying the glue to the chips already preheated to 92°C.Laboratory tests have confirmed that the mechanical properties of PB are in accordance with the requirements of EN 312/3 for chipboards for interior conditions, including furniture, for use in dry environments.
根据PCT/SK2023/000007 (ÚPV SR, 13.06.2023)的要求,采用聚醋酸乙烯酯(PVAc)胶对板材进行热压后,采用冷压新工艺,将新鲜和回收的木屑制成刨花板(PB)。为了比较,还进行了脲醛(UF)胶及其相互组合的实验。新方法缩短了热压时间,或降低了压制温度,而制备的PB从压力中释放出来,随着时间的推移不再弹性和固化。通过监测释放压力后PB的抗弯强度和弹性模量随时间的变化,描述了PVAc和UF胶粘剂的固化动力学。利用冷热压机对基于PVAc胶的PB压制过程进行了建模,该过程包括将压制板的横截面过热至90°C,然后冷却到电路板已经稳定的温度,即低于70°C,而压制周期持续140 s。通过将胶水涂在已经预热到92°C的芯片上,将压制周期缩短到100秒。实验室测试证实,PB的机械性能符合EN 312/3对室内条件(包括家具)的刨花板的要求,用于干燥环境。
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引用次数: 0
OPTICAL PROPERTIES OF TRANSPARENT WOOD PREPARED FROM BALSA 巴尔沙制透明木材的光学性能
4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.732742
IGOR WACHTER, TOMÁŠ ŠTEFKO, JOZEF MARTINKA, PETER ĎURIŠ, PETER RANTUCH, ZUZANA MÁRIA BUCHTOVÁ
In this study, transparent wood was prepared by deactivating chromophore groups in raw balsa wood, followed by solvent free dehydration and a subsequent vacuum-assisted polymer infiltration. Thermal degradation of transparent wood takes place in two main steps.Optical properties (colorimetry, transmittance) of transparent wood made from balsa wood and acrylic polymers were studied. Highest values of transmittance in the visible part of spectra were achieved by 0.7 mm thick samples at approx. 77%. The dependence of thickness ontransmittance showed a linear decrease with increasing thickness of transparent wood. Thecreated material also exhibits absorbing properties in visible and UV spectra.
在本研究中,透明木材是通过使原巴尔沙木中的发色团失活,然后进行无溶剂脱水和随后的真空辅助聚合物渗透来制备的。透明木材的热降解主要分为两个步骤。研究了由轻木和丙烯酸聚合物制成的透明木材的光学性能(比色、透光率)。当样品厚度为0.7 mm时,光谱可见部分的透射率达到最大值。77%。厚度对透光率的依赖性随着木材厚度的增加呈线性降低。所创造的材料在可见和紫外光谱中也表现出吸收特性。
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引用次数: 0
STUDY ON ACOUSTIC BLACK HOLE EFFECT OF ACOUSTIC EMISSION SIGNALS IN PINUS SYLVESTRIS VAR. MONGOLICA LITV 蒙古松声发射信号的声黑洞效应研究
4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.743757
FEILONG MAO, SAIYIN FANG, MING LI, GEZHOU QIN, YUE ZHAO, NING XU
The difference in density and wave velocity causes distinct wave impedance between air and wood, resulting in complex acoustic emission (AE) signals due to reflection on the wood's surface. This study explores the suppression of AE signal reflection by modifying the structure of thin wood panels, utilizing the theory of acoustic black holes (ABH). Initially, aone-dimensional ABH structure was created by forming a wedge structure on one side of thespecimen. Pencil-lead break (PLB) tests simulated sudden AE sources on the specimen's surface. AE signals were collected using three equidistant sensors on the upper surface, with asampling frequency of 2MHz. The AE signal was then segmented into frequency bands using the differential method and analyzed in both time and frequency domains. Comparisons were made to understand the impact of the one-dimensional ABH on AE signal propagation. Results demonstrated that the one-dimensional ABH effectively suppressed AE signal reflection on thewood's surface, reducing the high-frequency components by 18.31%, 20.83%, and 12.09% for each sensor, respectively. Furthermore, the experimental cut-off frequency of 0.98 kHz surpassed the theoretically calculated value of 0.39 kHz due to the disparity between the ABH structure's thickness and the theoretical prediction.
密度和波速的差异导致空气和木材之间的波阻抗不同,导致木材表面反射产生复杂的声发射(AE)信号。本研究利用声黑洞理论,探讨了通过改变薄木板结构来抑制声发射信号反射的方法。最初,通过在型材的一侧形成楔形结构来创建一维ABH结构。铅笔芯断裂(PLB)试验模拟了试样表面上突然的声发射源。AE信号采集采用上表面3个等距传感器,采样频率为2MHz。然后利用差分法对声发射信号进行频段分割,并进行时域和频域分析。通过比较了解一维ABH对声发射信号传播的影响。结果表明,一维ABH有效抑制了声发射信号在木材表面的反射,每个传感器的高频分量分别降低了18.31%、20.83%和12.09%。此外,由于ABH结构厚度与理论预测的差异,实验截止频率0.98 kHz超过了理论计算值0.39 kHz。
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引用次数: 0
NOISE EMISSION AND QUALITY OF SURFACE OF THERMALLY MODIFIED SILVER FIR WOOD PLANED BY HORIZONTAL MILLING MACHINE 卧式铣床热改性银杉木刨面噪声及表面质量
4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.718731
DRITAN AJDINAJ, HOLTA ÇOTA, FAKIJE ZEJNULLAHU, RRAHIM SEJDIU, AGRON BAJRAKTARI, KELI MUSTAFARAJ
This study was conducted to provide information regarding to noise emission and thesurface quality of silver fir wood (Abies albaMill.) planed at different feed rates after thermal modification. Four groups of sixteen samples were prepared. One group was used as control and the others were heated at 160°C, 190°C and 220°C, at atmospheric pressure for 3 h. After, all samples were processed along the grain by a planer machine, 3 m/min and 10 m/min feed rates were applied. Noise was measured using a sound level meter, while surface roughness measurements were performed by a stylus profilometer. Higher feed rates produced noticeably higher noise emission as for natural wood as for thermally modified one. Thetemperature was found to have a modest positive effect on the noise reduction. Theincrease of temperature and feed rate affected the increase in the surface roughness of thewood. Feed rate resulted as a more significant factor on the noise emission and on thesurface roughness than temperature.
本研究旨在提供不同进料速率下经热改性后的银杉木表面质量和噪声的相关信息。共制备4组样品,每组16份。其中一组作为对照,其余三组分别在160℃、190℃和220℃的常压下加热3小时。之后,所有样品在刨床上沿晶粒加工,采用3 m/min和10 m/min的进给速度。使用声级计测量噪声,而表面粗糙度测量由触笔轮廓仪进行。对于天然木材和热改性木材来说,更高的进料速率产生明显更高的噪声。研究发现,温度对降低噪音有一定的积极作用。温度和进料速度的增加影响木材表面粗糙度的增加。与温度相比,进给量对噪声发射和表面粗糙度的影响更为显著。
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引用次数: 0
ECOTOXICOLOGICAL TESTS OF THE PARTICLEBOARDS CONTAINING RUBBER WASTE 含废橡胶刨花板的生态毒理学试验
4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.758767
HELENA HYBSKÁ, MARTINA MORDÁČOVÁ, DAGMAR SAMEŠOVÁ, IVETA ČABALOVÁ
The article is focused on the production and environmental evaluation of wood composites using waste rubber in the construction industry. Used aqueous extracts were prepared from theexperimental wooden composites with various additions of thewaste rubber from tires and waste seals. The pH value and organic pollution (by COD) were determined in the aqueous extracts. The effect on the environmental components (aquatic and terrestrial) was ecotoxicologically tested using the test organisms Sinapis alba, Lemna minorand Daphnia magna. Preliminary acute ecotoxicity tests were performed.
本文主要介绍了利用建筑行业废橡胶制备木质复合材料的工艺及环境评价。用不同添加剂的废轮胎橡胶和废密封件制备了木制复合材料的水萃取物。测定了水提物的pH值和有机污染(COD)。利用试验生物Sinapis alba、lena minor和Daphnia magna对环境组分(水生和陆生)的影响进行了生态毒理学试验。进行了初步急性生态毒性试验。
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引用次数: 0
SHORT NOTES: FIRST REPORT OF THE PHYTOPATHOGENIC FUNGUS ALTERNARIA TENUISSIMA IN CEDARWOOD (CEDRUS ATLANTICA M.) IN MOROCCO 短注:雪松(cedrus atlantica m .)植物病原真菌tenuissima的首次报道在摩洛哥
4区 农林科学 Q3 MATERIALS SCIENCE, PAPER & WOOD Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.619626
OUSSAMA CHAUIYAKH, ELMOSTAFA EL FAHIME, OUMAIMA NINICH, SAMAR AARABI, FATIHA BENTATA, ABDELAZIZ CHAOUCH, AZIZ ETTAHIR
Our research focuses on identifying lignivorous fungus from decayed cedarwood. Asample was taken from Azrou forest's cedar grove, which is a part of Morocco's Ifrane National Park. On a water agar medium first, and subsequently a PDA medium, the isolated fungus was cultured and purified. After the fungus was purified, an optical microscope morphological analysis allowed us to identify the pathogen Alternaria tenuissima. Thesefindings were confirmed by a molecular characterisation, which had a coverage rate of 94% and an identity of 94,88%. This is the first report of A. tenuissimain decomposing cedarwood that we are knowledge of.
我们的研究重点是鉴定腐烂雪松木中的木质素食性真菌。样本取自Azrou森林的雪松林,这是摩洛哥伊夫兰国家公园的一部分。首先在水琼脂培养基上,然后在PDA培养基上,对分离的真菌进行培养和纯化。真菌纯化后,光学显微镜形态分析使我们能够鉴定出病原体细纹线虫。这些发现被分子表征证实,其覆盖率为94%,识别度为94,88%。这是我们所知的第一个关于A. tenuissimain分解雪松木的报道。
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引用次数: 1
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Wood Research
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