Maderas-Cienc Tecnol最新文献_第2页

Usability of fractometer for the purpose of a practical preliminary assessment tool for wood density of Pinus brutia 馏分测定仪作为初步评估欧洲赤松木材密度的实用工具的可用性

Maderas-Cienc Tecnol Pub Date : 2024-01-12 DOI: 10.22320/s0718221x/2024.29

Bilgin Içel

{"title":"Usability of fractometer for the purpose of a practical preliminary assessment tool for wood density of Pinus brutia","authors":"Bilgin Içel","doi":"10.22320/s0718221x/2024.29","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.29","url":null,"abstract":"The fractometer is a device that breaks increment cores to measure fracture strength. The advantages of the device are that it is relatively fast, easy to use in the field, and it can perform direct strength measurements on increment cores. The main purpose of the study was to evaluate the usability of the fractometer as a preliminary evaluation tool for wood density traits of standing Turkish Pinus brutia (red pine) trees. Fracture strength was measured on 5 mm diameter increment cores, and X-ray densitometry was used for density measurements. Due to the high correlation between the two traits (fracture and density), a model was built using linear regression. Fifty trees were sampled to build the statistical model (r2: 0,74), and an equal sample size was used to test the model. The density value obtained from the model was 0,546 gcm-3, while the density value averaged by the X-ray method for the same group was 0,543 gcm-3. When considering mean values, it can be said that the model provides a good prediction. Based on personal experience and research results, some trees exhibited better growth and wood quality traits than others. Breeding from these trees could offer improvement in timber production and performance for Pinus brutia (red pine). As a general consequence, the fractometer and increment core sampling can be used for pine tree breeding programs for the preliminary assessment of wood density.","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"35 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139532243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of nanocellulose/pyrolysis oil nanocomposite films 纳米纤维素/水解油纳米复合薄膜的表征

Maderas-Cienc Tecnol Pub Date : 2024-01-09 DOI: 10.22320/s0718221x/2024.25

Mustafa Zor, Engin Kocatürk, Ferhat Şen, Barlas Oran, Zeki Candan

{"title":"Characterization of nanocellulose/pyrolysis oil nanocomposite films","authors":"Mustafa Zor, Engin Kocatürk, Ferhat Şen, Barlas Oran, Zeki Candan","doi":"10.22320/s0718221x/2024.25","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.25","url":null,"abstract":"In this study, the sustainable recycling of tire waste, which is frequently formed in the automotive industry, and the transformation of this recycling into valuable materials are in question. Waste tire pyrolysis oil obtained as a result of the pyrolysis of tire wastes was evaluated for the first time as a reinforcement element in nanocellulose-based nanocomposite films. Nanocellulose was produced using the TEMPO method (2,2,6,6-tetramethylpiperidine-1-oxyl radical). 5 %, 10 % and 20 % pyrolysis oil were added to the nanocomposite films. Thermal (thermal gravimetric analysis, differential scanning calorimetry, thermomechanical (dynamic mechanical thermal analysis and morphological (scanning electron microscopy) characterization of the produced nanocomposite films were performed. The highest thermal stability was observed in the nanocellulose/pyrolysis oil-20 sample with 20% pyrolysis oil additive. The pyrolysis oil-reinforced nanocomposites resulted in an excellent increase in storage and loss modulus. The storage modulus of the 20 % pyrolysis oil added sample at 100 °C was exactly 18 times that of pure nanocellulose. Nanocellulose-based nanocomposite films with superior thermal properties and structural compatibility demonstrated by characterized results have been shown to be pioneers in future industrial applications such as pharmacy, coating, green packaging.","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"53 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance characterization of plywood panels bonded with melamine-urea-formaldehyde resin and cellulose nanofibril/borax as an additive 用三聚氰胺-脲醛树脂和纳米纤维素/硼砂作为添加剂粘合的胶合板的性能表征

Maderas-Cienc Tecnol Pub Date : 2024-01-08 DOI: 10.22320/s0718221x/2024.23

Mert Yildirim, Zeki Candan, Turgay Akbulut, Douglas Gardner, Stephen Shaler

{"title":"Performance characterization of plywood panels bonded with melamine-urea-formaldehyde resin and cellulose nanofibril/borax as an additive","authors":"Mert Yildirim, Zeki Candan, Turgay Akbulut, Douglas Gardner, Stephen Shaler","doi":"10.22320/s0718221x/2024.23","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.23","url":null,"abstract":"In this study, different loading levels of cellulose nanofibril and borax were added as reinforcement in melamine-urea-formaldehyde adhesive to enhance the performance properties of plywood panels as engineered wood composites. Physical properties (density, thickness swelling, water absorption, and moisture content), mechanical properties (modulus of rupture, modulus of elasticity, and bonding strength), and formaldehyde content were tested using relevant standards. The results showed that cellulose nanofibril and borax had a synergistic effect, resulting in improved physico-mechanical properties. The best results were obtained by combining 3 % cellulose nanofibril and borax. It was determined that the combination of cellulose nanofibril and borax reinforcement resulted in a significant improvement of around 15 % in the thickness swelling, water absorption, and moisture content of plywood panels. The combination of cellulose nanofibril and borax reinforcing resulted in a significant increase of around 26 % in the modulus of rupture and modulus of elasticity of plywood panels, with a bonding strength of around 47 %. The reinforcement technique did result in a 34 % decrease in free formaldehyde content. As a consequence, cellulose nanofibril and borax can be used as effective additives in the production of plywood panels to enhance their performance properties.","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"31 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140512452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Total phenolics, tannin contents, antioxidant properties, protein and sensory analysis of Pleurotus ostreatus, Pleurotus citrinopileatus and Pleurotus djamor cultivated on different sawdusts 在不同锯屑上栽培的黑木耳、枸橼酸黑木耳和黑木耳的总酚、单宁含量、抗氧化性、蛋白质和感官分析

Maderas-Cienc Tecnol Pub Date : 2024-01-08 DOI: 10.22320/s0718221x/2024.20

C. Kılıç, Ayşenur Gürgen, S. Yıldız, Zehra Can, Atiye Degirmenci

{"title":"Total phenolics, tannin contents, antioxidant properties, protein and sensory analysis of Pleurotus ostreatus, Pleurotus citrinopileatus and Pleurotus djamor cultivated on different sawdusts","authors":"C. Kılıç, Ayşenur Gürgen, S. Yıldız, Zehra Can, Atiye Degirmenci","doi":"10.22320/s0718221x/2024.20","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.20","url":null,"abstract":"In mushroom cultivation, it is important to be aware of the impact of the growing substrate. This study investigated the cultivation of various oyster mushrooms, including Pleurotus ostreatus, Pleurotus citrinopileatus, and Pleurotus djamor, on different types of wood sawdust. Total phenolic content, condensed tannins, antioxidant activity by ferric reducing antioxidant power assay, protein and sensory evaluations were performed in cultivated oyster mushrooms. Wood sawdust of Fagus orientalis (oriental beech), Alnus glutinosa (alder), Castanea sativa (chestnut), and Juglans regia (walnut) were used as substrate for studied mushroom type, separately. Because champignon (Agaricus bisporus) was the most consumed mushroom, it was used as control sample. Methanolic extracts of dried mushrooms were used to measure bioactive characteristics. Pleurotus ostreatus samples cultivated in Alnus glutinosa (alder) sawdust substrate had the highest antioxidant activity. The lowest antioxidant activity values were found in Pleurotus djamor cultivated in Juglans regia (walnut) wood sawdust substrate. The highest protein content was measured in Agaricus bisporus as 13,84 %. The other highest protein concentration was found in Pleurotus ostreatus cultivated in Alnus glutinosa (alder) sawdust substrate, at 13,75 %. The lowest protein concentration belonged to Pleurotus citrinopileatus cultivated in Fagus orientalis (oriental beech) sawdust substrate as 9,86 %. While Agaricus bisporus and Pleurotus ostreatus had the highest overall appreciation score, Pleurotus citrinopileatus had the lowest. It has been observed that the substrate content has an important impact on chemical and sensory properties of the oyster mushrooms. This study provides knowledge on the chemical and sensory characteristics of three different Pleurotus mushroom species cultivated on different composts.","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"7 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139445168","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Densidad y proporción de albura y duramen en nuevos clones de Eucalyptus spp 桉树新克隆的边材和心材密度和比例

Maderas-Cienc Tecnol Pub Date : 2024-01-08 DOI: 10.22320/s0718221x/2024.24

Christian Bulman Hartkopf, Rosa Angela Winck, Diego Rolando Aquino, H. Fassola, P. M. Stefani

{"title":"Densidad y proporción de albura y duramen en nuevos clones de Eucalyptus spp","authors":"Christian Bulman Hartkopf, Rosa Angela Winck, Diego Rolando Aquino, H. Fassola, P. M. Stefani","doi":"10.22320/s0718221x/2024.24","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.24","url":null,"abstract":"La generación de nuevos materiales genéticos para atender las diversas demandas del mercado de la madera requiere una constante evaluación de sus propiedades tecnológicas. En el presente estudio, se evaluó el contenido relativo de duramen y albura a tres alturas de fuste (0,10 m, 2,80 m y 5,50 m) así como la variación de densidad en dirección axial y radial de clones puros Eucalyptus grandis (rose gum) e híbridos (Eucalyptus grandis (rose gum) x Eucalyptus camaldulensis (red gum) y Eucalyptus grandis (rose gum) x Eucalyptus tereticornis (red irongum)) de 11 años de edad. Los clones puros mostraron un 10 % más de duramen que los híbridos. El material híbrido alcanzó el mayor valor medio de densidades, siendo más homogéneo en el perfil radial y axial. En general, la densidad presentó un patrón creciente en la dirección radial. No se encontraron diferencias significativas en la densidad para las alturas estudiadas en los clones híbridos, mientras que los clones puros presentaron valores de densidad significativamente mayores a 0,10 m. La densidad de la albura fue mayor que la del duramen para las tres alturas de fuste en todos los materiales genéticos. El análisis de los resultados indica que los clones híbridos podrían ser aptos para la producción de pulpa de celulosa debido a la menor proporción de duramen, lo cual facilita el proceso de blanqueo, así como para su uso como madera aserrada o contrachapado estructural por su mayor densidad y homogeneidad en altura.","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"50 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139447225","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influences of oak utilization on the medium density fiberboard properties 利用橡木对中密度纤维板性能的影响

Maderas-Cienc Tecnol Pub Date : 2024-01-08 DOI: 10.22320/s0718221x/2024.21

Osman Çamlıbel, Murat Aydın, E. Koç

引用次数: 0

Radial compression strength can predict the hydraulic vulnerability of mature Norway spruce sapwood 径向压缩强度可预测成熟挪威云杉边材的水力脆弱性

Maderas-Cienc Tecnol Pub Date : 2024-01-08 DOI: 10.22320/s0718221x/2024.19

Sabine Rosner, Saskia Luss, Johannes Konnerth, Norbert Kunert

{"title":"Radial compression strength can predict the hydraulic vulnerability of mature Norway spruce sapwood","authors":"Sabine Rosner, Saskia Luss, Johannes Konnerth, Norbert Kunert","doi":"10.22320/s0718221x/2024.19","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.19","url":null,"abstract":"Hydraulic testing of isolated sapwood from mature tree trunks is time-consuming and prone to errors, whereas the measurement of compression strength is a standardized and rapid wood technological application. In this study, we aimed to analyze if compression stress perpendicular to the grain relates to hydraulic vulnerability of mature Norway spruce (Picea abies) trunk wood with an expected narrow vulnerability range. The sample-set comprised 52 specimens originating from 34 trees harvested in Sweden. Before mechanical testing, the P50, i.e., the water potential resulting in 50 % of hydraulic conductivity loss, was estimated on small sapwood beams employing the air injection method. Compression strength perpendicular to the grain was defined as the first peak of a stress-strain curve (peak stress) when the wood is subjected to radial compression. Peak stress ranged between 1,65 MPa and 5,07 MPa, P50 between -2,98 MPa and -1,98 MPa. We found a good correlation between the peak stress and P50 (r = 0,80; P < 0,0001). This provides further evidence that peak stress in radial compression and P50 are both extremely dependent on the characteristics of the “weakest” wood part, i.e., the highly conductive earlywood. We conclude that the radial compression strength is a good proxy for P50 of mature Norway spruce trunk wood.","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"52 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139446132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of gluing parameters in Edge Glued Panels 改善边缘胶合板的胶合参数

Maderas-Cienc Tecnol Pub Date : 2024-01-08 DOI: 10.22320/s0718221x/2024.22

Dante Guilherme Lanhe, Charles Leonardo Israel

{"title":"Improvement of gluing parameters in Edge Glued Panels","authors":"Dante Guilherme Lanhe, Charles Leonardo Israel","doi":"10.22320/s0718221x/2024.22","DOIUrl":"https://doi.org/10.22320/s0718221x/2024.22","url":null,"abstract":"Faced with the need for innovation and waste reduction that the market demands, the high consumption of adhesive in the furniture industry led to the need and interest in studying ways to reduce this consumption, through changes in the bonding process without compromising the mechanical properties of the bonded material. The collage is carried out to form Edge Glued Panels of Pinus taeda (loblolly pine), using PolyVinyl Acetate adhesive with an average weight of 205 g/m². If lower weights are used, using the current application method (roller), mechanical strength problems begin to arise. The objective of this work was to study the feasibility of applying glue by another method (spray) with weights and, consequently, shorter pressing times, to evaluate the conservation of the mechanical properties of the panels through shear and traction tests. For that, samples were made according to the standards with the current situation of bonding (weight of 205 g/m² and pressing time of 80 s), to obtain reference results in the tests, and in the proposed situations (adhesive weights of 125 g/m² and 80 g/m² and pressing times of 70 s and 75 s), in an attempt to reach the established reference values. Regarding the results, it was feasible to conclude that the current method could be replaced by the proposed one, using the spray together with an adhesive weight of 125 g/m² and pressing times of 75 s and 70 s, with no statistically significant difference for the current method","PeriodicalId":513241,"journal":{"name":"Maderas-Cienc Tecnol","volume":"27 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139445195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0