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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
Wood Research Pub Date : 2023-04-26 DOI: 10.37763/wr.1336-4561/68.2.389402
Chunmei Yang, Zanbin Zhu, Jiuqing Liu, Bo Xue, Yucheng Li
{"title":"MODEL CONSTRUCTION AND MICROWAVE PREHEATING EXPERIMENTS USING FIBERBOARD","authors":"Chunmei Yang, Zanbin Zhu, Jiuqing Liu, Bo Xue, Yucheng Li","doi":"10.37763/wr.1336-4561/68.2.389402","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.2.389402","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49192532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Wood Research 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
{"title":"PREDICTION OF EFFICACY OF DEACIDIFICATION PROCESS","authors":"K. Vizárová, Soňa Malečková, M. Jablonský, Štefan Varga, F. Kačík, S. Katuščák","doi":"10.37763/wr.1336-4561/68.2.306319","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.2.306319","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2023-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43835749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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
Wood Research Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.704717
HENRICH LÜBKE, VLADIMÍR IHNÁT
{"title":"TECHNOLOGY OF PARTICLEBOARD’S PREPARATION BY COLD PRESSING AFTER HOT MAT COMPRESSION","authors":"HENRICH LÜBKE, VLADIMÍR IHNÁT","doi":"10.37763/wr.1336-4561/68.4.704717","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.4.704717","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135157363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Wood Research 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
{"title":"OPTICAL PROPERTIES OF TRANSPARENT WOOD PREPARED FROM BALSA","authors":"IGOR WACHTER, TOMÁŠ ŠTEFKO, JOZEF MARTINKA, PETER ĎURIŠ, PETER RANTUCH, ZUZANA MÁRIA BUCHTOVÁ","doi":"10.37763/wr.1336-4561/68.4.732742","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.4.732742","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135157998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Wood Research 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
{"title":"STUDY ON ACOUSTIC BLACK HOLE EFFECT OF ACOUSTIC EMISSION SIGNALS IN PINUS SYLVESTRIS VAR. MONGOLICA LITV","authors":"FEILONG MAO, SAIYIN FANG, MING LI, GEZHOU QIN, YUE ZHAO, NING XU","doi":"10.37763/wr.1336-4561/68.4.743757","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.4.743757","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135157992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Wood Research 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
{"title":"NOISE EMISSION AND QUALITY OF SURFACE OF THERMALLY MODIFIED SILVER FIR WOOD PLANED BY HORIZONTAL MILLING MACHINE","authors":"DRITAN AJDINAJ, HOLTA ÇOTA, FAKIJE ZEJNULLAHU, RRAHIM SEJDIU, AGRON BAJRAKTARI, KELI MUSTAFARAJ","doi":"10.37763/wr.1336-4561/68.4.718731","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.4.718731","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135157662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Wood Research Pub Date : 2023-01-01 DOI: 10.37763/wr.1336-4561/68.4.758767
HELENA HYBSKÁ, MARTINA MORDÁČOVÁ, DAGMAR SAMEŠOVÁ, IVETA ČABALOVÁ
{"title":"ECOTOXICOLOGICAL TESTS OF THE PARTICLEBOARDS CONTAINING RUBBER WASTE","authors":"HELENA HYBSKÁ, MARTINA MORDÁČOVÁ, DAGMAR SAMEŠOVÁ, IVETA ČABALOVÁ","doi":"10.37763/wr.1336-4561/68.4.758767","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.4.758767","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135157707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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
Wood Research 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
{"title":"SHORT NOTES: FIRST REPORT OF THE PHYTOPATHOGENIC FUNGUS ALTERNARIA TENUISSIMA IN CEDARWOOD (CEDRUS ATLANTICA M.) IN MOROCCO","authors":"OUSSAMA CHAUIYAKH, ELMOSTAFA EL FAHIME, OUMAIMA NINICH, SAMAR AARABI, FATIHA BENTATA, ABDELAZIZ CHAOUCH, AZIZ ETTAHIR","doi":"10.37763/wr.1336-4561/68.4.619626","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/68.4.619626","url":null,"abstract":"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.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135783798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
SHORT NOTES: A RESEARCH ON THE APPLICATION OF INDUSTRIAL BY-PRODUCT CALCIUM SULFATE WHISKERS IN PAPER FILLING 工业副产品硫酸钙晶须在造纸中的应用研究
IF 1.3 4区 农林科学
Wood Research Pub Date : 2022-06-09 DOI: 10.37763/wr.1336-4561/67.3.511518
Sheng Xu, P. Xu, Yuting Du, Puqi Zhao
{"title":"SHORT NOTES: A RESEARCH ON THE APPLICATION OF INDUSTRIAL BY-PRODUCT CALCIUM SULFATE WHISKERS IN PAPER FILLING","authors":"Sheng Xu, P. Xu, Yuting Du, Puqi Zhao","doi":"10.37763/wr.1336-4561/67.3.511518","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.3.511518","url":null,"abstract":"The basic properties of calcium sulfate whiskers were studied and compared with commercial ground calcium carbonate (GCC) fillers. The modified whiskers were used for paper filling and compared with a commercial precipitated calcium carbonate (PCC). As a result, it shows that when the unmodified calcium sulfate whisker is used to fill the paper, the ash content of the handmade sheet is low because of its dissolution problem. The ash content of the paper increased obviously when the modified calcium sulfate whisker was added, which reached the ash level of PCC filling. In addition, the paper strength increased greatly, but the light scattering coefficient decreased. In addition, the strength property of the modified calcium sulfate whisker filling paper is basically the same as that of the PCC filling paper with 14.99% ash content when the ash content of the modified calcium sulfate whisker filling paper is 21.95%.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45733223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
A MICRO-GRAPH RETRIEVAL SYSTEM FOR CONIFEROUS WOODS USING MULTIPLE METHODS 基于多种方法的针叶林显微图谱检索系统
IF 1.3 4区 农林科学
Wood Research Pub Date : 2022-06-09 DOI: 10.37763/wr.1336-4561/67.3.488500
Qizhao Lin, Xin He, Jian Qiu, Hong Wang
{"title":"A MICRO-GRAPH RETRIEVAL SYSTEM FOR CONIFEROUS WOODS USING MULTIPLE METHODS","authors":"Qizhao Lin, Xin He, Jian Qiu, Hong Wang","doi":"10.37763/wr.1336-4561/67.3.488500","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.3.488500","url":null,"abstract":"Inspired by the successful application of deep convolutional neural network, a coniferous micro-graphs retrieval framework based on deep learning and image processing technology is proposed. The idea of the proposed framework is that the texture feature of representing three section surfaces can be learned and classified by a fully CNN, and the canals can be deep learned by an U-net CNN when the data labels are available. In addition, the image processing technologies are also proposed to identify whether the growth ring boundaries are distinct and whether there is a “window-like” cross-field pitting. Finally, a coniferous micro-graphs retrieval system is realized based the proposed methods. Experimental results demonstrate that this system outperforms in terms of recognition accuracy. In addition, the system can be further developed into more intelligent coniferous retrieval system that can automatically identify more coniferous microscopic features, so as to obtain more accurate retrieval results.","PeriodicalId":23786,"journal":{"name":"Wood Research","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43234130","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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