European Journal of Wood and Wood Products最新文献_第8页

In-situ modification of wood polymer via impregnation with ultra-low molar ratio urea-formaldehyde resins 超低摩尔比脲醛树脂浸渍原位改性木质聚合物

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-13 DOI: 10.1007/s00107-024-02160-5

Sarah Augustina, Wahyu Dwianto, Narto, Adik Bahanawan, Prabu S. Sejati, Yusup Amin, Teguh Darmawan, Imam Wahyudi, Lina Karlinasari, Ika Juliana, Hiroshi Isoda, Philippe Gérardin, Muhammad Adly Rahandi Lubis

{"title":"In-situ modification of wood polymer via impregnation with ultra-low molar ratio urea-formaldehyde resins","authors":"Sarah Augustina, Wahyu Dwianto,  Narto, Adik Bahanawan, Prabu S. Sejati, Yusup Amin, Teguh Darmawan, Imam Wahyudi, Lina Karlinasari, Ika Juliana, Hiroshi Isoda, Philippe Gérardin, Muhammad Adly Rahandi Lubis","doi":"10.1007/s00107-024-02160-5","DOIUrl":"10.1007/s00107-024-02160-5","url":null,"abstract":"<div><p>This study investigates how the impregnation of ultra-low molar ratio urea-formaldehyde (UL-UF) resins with formaldehyde to urea (F/U) mole ratio of 0.8 at various curing temperatures affects wood characteristics, including density, weight percent gain (WPG), weight loss (WL), and anti-swelling efficiency (ASE). The UL-UF resins were synthesized using a modified alkaline-acid-alkaline process, resulting in low viscosity, low crystallinity, and low curing temperature of resins. The impregnation technique started by immersing sengon (<i>Paraserianthes falcataria</i> L. Nielsen) wood in UL-UF resins at a volume ratio of 1.0:1.1, subjecting to a vacuum of -50 cmHg for 30 min, and applying 7 kgf.cm<sup>-2</sup> of pressure for 3 h at 25 ± 2 °C. The treated wood was cured at temperatures of 120, 140, 160, and 180 °C for 30 min. This research revealed that there was a successful in-situ modification of wood with UL-UF resin, as confirmed by SEM micrographs, XRD and semi-quantitative FTIR analysis. The UL-UF-impregnated wood had a higher WPG and density than untreated wood. Greater curing temperatures were linked to decrease WPG, density, and WL values, but higher ASE. Lowering the curing temperature induces higher WL and decreased ASE owing to under-curing in the core layer, while raising the curing temperature promotes faster curing and gelation time, resulting in the opposite effect.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142976556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Adhesive free Melaleuca rhaphiophylla (Swamp Paperbark) bark as an engineered wood product 无胶粘剂的千层木（沼泽纸）树皮是一种工程木材产品

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-09 DOI: 10.1007/s00107-024-02161-4

William John Richards, Monte Masarei, Andrew Louis Guzzomi

{"title":"Adhesive free Melaleuca rhaphiophylla (Swamp Paperbark) bark as an engineered wood product","authors":"William John Richards, Monte Masarei, Andrew Louis Guzzomi","doi":"10.1007/s00107-024-02161-4","DOIUrl":"10.1007/s00107-024-02161-4","url":null,"abstract":"<div><p>This study investigated the potential for <i>Melaleuca rhaphiophylla</i> bark to be made into a sustainable engineered wood product. Boards were manufactured from <i>M. rhaphiophylla</i> bark by hot pressing them without the use of any additional binders or other chemical treatments. Sheets of bark were pressed for 20 min at temperatures of 90 °C, 120 °C, 150 °C, 180 °C and 195 °C and pressures of 1, 2 and 3 MPa. Samples of the boards underwent three-point bending, water absorption and impedance tube testing to determine their Modulus of Rupture (MoR), Modulus of Elasticity (MoE), thickness swelling, water absorption and sound absorption potential. Linear mixed effects (LME) models were used to identify correlations between the condition of the bark and hot-pressing parameters with the properties of the final boards. The MoR, MoE and thickness swelling properties of the boards were found to be similar or superior to other bark-based alternatives. Water absorption was similar to commercially available plywood and medium density fibreboard (MDF) control materials, sound absorption was higher, but MoR and MoE were lower. <i>M. rhaphiophylla</i> bark boards show potential to be suitable alternatives for medium density fibreboard and plywood including uses in cabinetry or veneers with further development.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Determining the quantity and quality of wood recovered from building demolitions to enable effective allocation 确定拆卸建筑物回收的木材的数量和质量，以便有效分配

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-09 DOI: 10.1007/s00107-024-02170-3

Bahareh Nasiri, Satyaki Roy, Mark Hughes

引用次数: 0

Pretreatment of pine and poplar particleboards with Pleurotus ostreatus (Jacq.): physicomechanical and chemical properties of wood, potential of solid fuel and biogas production 用平菇预处理松木和杨木刨花板：木材的物理力学和化学性能，固体燃料和沼气生产的潜力

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-09 DOI: 10.1007/s00107-024-02192-x

Paweł Tryjarski, Aleksander Lisowski, Adam Świętochowski

{"title":"Pretreatment of pine and poplar particleboards with Pleurotus ostreatus (Jacq.): physicomechanical and chemical properties of wood, potential of solid fuel and biogas production","authors":"Paweł Tryjarski, Aleksander Lisowski, Adam Świętochowski","doi":"10.1007/s00107-024-02192-x","DOIUrl":"10.1007/s00107-024-02192-x","url":null,"abstract":"<div><p>This study, which evaluated the effects of biological pretreatment on comminuted pine and poplar shavings and particleboards with urea–formaldehyde resin (UF), utilising <i>Pleurotus ostreatus</i> (<i>P. ostreatus</i>), holds statistically significant implications for the future of waste management and biogas production. The 17-week fungal pretreatment was followed by a physicomechanical and chemical analysis of raw and pretreated materials and pressure agglomeration to produce pastilles and an anaerobic digestion process to produce biogas. The specific density and strength parameters in radial and axial compression were determined for the produced pastilles. The pretreatment notably reduced lignin content by 6.8–8.3%, which increased mechanical parameters, angles of internal friction, cohesion, shear, and consolidation stresses and positively affected agglomeration efficiency and increased pellet density. Values for the specific compaction work of treated biomass were higher than those of raw biomass (24.03 vs. 21.70 kJ kg<sup>−1</sup>), correlating with the production of denser pastilles (1014 vs. 959 kg m<sup>−3</sup>). After pretreatment, enhanced structural properties of the biomass (lignin and hemicellulose components decreased, and cellulose content increased) facilitated increased methane yields, showing up to a 3.7-fold increase for pine and 2.9-fold for poplar UF particleboards. This research advances the potential for developing recycling and biogas technologies, offering novel insights into UF degradation via fungal pretreatment. The findings underscore the necessity for further detailed studies to analyse changes in resin content post-pretreatment and their impact on the properties of wood materials.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938728","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Performance degradation of glued-laminated timber beams under multi-factor environmental aging and sustained load 多因素环境老化和持续荷载作用下胶合层合木梁的性能退化

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-08 DOI: 10.1007/s00107-024-02189-6

Xueliang Wang, Xiao Zhang, Mingrong Zhang, Frank Lam, Minghao Li, Zhe Chen

{"title":"Performance degradation of glued-laminated timber beams under multi-factor environmental aging and sustained load","authors":"Xueliang Wang, Xiao Zhang, Mingrong Zhang, Frank Lam, Minghao Li, Zhe Chen","doi":"10.1007/s00107-024-02189-6","DOIUrl":"10.1007/s00107-024-02189-6","url":null,"abstract":"<div><p>Structural performance of timber buildings can be adversely affected by exposed harsh environment and sustained load. This study investigates bending performance degradation of glued laminated timber (GLT) beams (50 mm × 50 mm × 950 mm) that are exposed to unfavorable environmental conditions. The experiments consider eight scenarios, including various climate cycling periods, duration, and stress levels. Eight groups of GLT beams were exposed to the different scenarios for four stages, then loaded by short-term bending to obtain the MOR and MOE. The results showed that coupling effects of sustained loading and the environmental factors such as UV-light and mist spraying aggravated the pronounced damage on the laminates and gluelines and caused the degradation of strength and stiffness. The highest degradation rate occurred in the first stage. In the relatively mild environments, some performance recovery was observed in the later stages, most specimens exhibited ductile failure accompanied by the significant increase of the ultimate deflection with the exposure time. While in the harsh environments, the MOR and MOE degradation was evident and continuous, more specimens experienced brittle failure, and the increase of the ultimate deflection slowed down greatly with the exposure time. Additionally, the effects of sustained loading period were significantly exacerbated under the harsh environmental conditions, the specimens loaded by less than 50% stress level exhibited the distinguished degradation in 24 days.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939040","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Measuring wood density of different tree species using the micro-drilling resistance method 用微钻阻力法测定不同树种木材密度

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-08 DOI: 10.1007/s00107-024-02193-w

Jianfeng Yao, Hengyuan Liu, Jun Lu

{"title":"Measuring wood density of different tree species using the micro-drilling resistance method","authors":"Jianfeng Yao, Hengyuan Liu, Jun Lu","doi":"10.1007/s00107-024-02193-w","DOIUrl":"10.1007/s00107-024-02193-w","url":null,"abstract":"<div><p>In order to reduce modeling workload and improve the accuracy of wood density measurement, a modeling method for establishing an overall model for multiple tree species was studied. Firstly, the wood cores and drill resistance of 9 tree species were collected. The absolute dry density, wood moisture content, and average drill resistance for each wood core were calculated. Secondly, the random forest algorithm was used to rank the relative importance of each factor affecting wood density, and factors with relative importance higher than 0.05 were selected as independent variables for building the overall mathematical model for total tree species and sub model for individual tree species. The results showed that: (1) the relative importance of tree species and drill resistance on wood density was higher than 0.05; (2) the relative importance of moisture content and drill usage frequency (less than 150 times) on wood density was lower than 0.05; (3) the average estimation accuracy of overall model was 91.42%, while that of the sub model was only 90.44%; (4) among the 9 tree species, the standard deviation of the overall model for 5 tree species was lower than that of the sub model. The results showed that the accuracy and stability of the overall model were superior to those of the sub models, and it is feasible to establish an overall model to estimate wood density.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142939039","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Mineralization of heat-treated fir wood with magnesium oxychloride: thermal characteristics and flame retardation 用氯化镁处理冷杉木材的矿化：热特性和阻燃性

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-06 DOI: 10.1007/s00107-024-02191-y

Mohammad Saleh Zare, Behbood Mohebby, Ali Shalbafan

{"title":"Mineralization of heat-treated fir wood with magnesium oxychloride: thermal characteristics and flame retardation","authors":"Mohammad Saleh Zare, Behbood Mohebby, Ali Shalbafan","doi":"10.1007/s00107-024-02191-y","DOIUrl":"10.1007/s00107-024-02191-y","url":null,"abstract":"<div><p>The aim of this study was to improve the flame retardation and performance characteristics of wood through impregnation with magnesium-based compounds. Fir wood (<i>Abies sp.</i>) samples, both heat-treated and non-heat-treated, were impregnated with magnesium oxide and magnesium chloride using combined and separate methods. Impregnation was carried out under an initial vacuum followed by pressure. The effects of impregnation on the wood's structure, thermal properties, and fire resistance were investigated using FTIR spectroscopy, XRD analysis, TGA analysis, and flame retardation tests. FTIR, XRD, and TGA analyses confirmed increased thermal stability and crystallinity in impregnated samples, especially non-heat-treated samples. Wood impregnation with magnesium compounds extended the time to ignition, reduced flame duration, and decreased glowing combustion duration. Impregnation of samples resulted in a less carbonized surface. The lowest carbonized surface was observed in the combined-method impregnated non-heat-treated sample. Based on the results of this study, it can be concluded that the impregnation of heat-treated and non-heat-treated wood with magnesium compounds (oxide and chloride) was successful in improving flame retardation and performance characteristics.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Machine learning based density estimation of light red meranti (Shorea spp.): a segmented approach to multiple regression of self-organising maps colour clusters using custom made ‘KayuSort’ colour sorting software 基于机器学习的浅红色莫兰蒂（Shorea spp.）密度估计：使用定制的“KayuSort”颜色分类软件对自组织地图颜色簇进行多元回归的分割方法

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-05 DOI: 10.1007/s00107-024-02188-7

Chiat Oon Tan, Ogata Shigenobu, Siew-Cheok Ng, Hwa Jen Yap, Zuriani Usop, Mohd ’Akashah Fauthan, Khairuddin Mahalil, Shaer Jin Liew

{"title":"Machine learning based density estimation of light red meranti (Shorea spp.): a segmented approach to multiple regression of self-organising maps colour clusters using custom made ‘KayuSort’ colour sorting software","authors":"Chiat Oon Tan, Ogata Shigenobu, Siew-Cheok Ng, Hwa Jen Yap, Zuriani Usop, Mohd ’Akashah Fauthan, Khairuddin Mahalil, Shaer Jin Liew","doi":"10.1007/s00107-024-02188-7","DOIUrl":"10.1007/s00107-024-02188-7","url":null,"abstract":"<div><p>Wood density is an important characteristic of wood which correlates to its strength. This study proposes an algorithm using multiple regression on pre-segmented colour images of the wood to estimate the density of light red meranti (<i>Shorea</i> spp.) (LRM). Two batches of LRM timber were randomly selected from a factory (Batch 1: 119 samples, Batch 2: 79 samples). Timber samples were kiln-dried, free of sapwood and major visual defects, and freshly surfaced 2 sides. The apparent density and moisture content (MC) of each timber sample were measured. The samples were then imaged and colour-sorted using KayuSort, an in-house industrial timber colour sorting prototype that uses the self-organising map (SOM) algorithm. Otsu thresholding was applied to several different colour space components to obtain features. Multiple regression was applied to obtain an equation to estimate the density of the wood. Coefficients of determination (<span>(hbox {R}^{2})</span>) and 95<span>(%)</span> Limits of Agreement (LoA) were used to assess performance. Performing colour segmentation to the dataset using KayuSort for average <span>(text {YC}_b{text{C}}_r)</span> colour space scored an <span>(hbox {R}^{2})</span> of 0.7109 and an LoA of ±146.8 <span>(hbox {kgm}^{-3})</span>. Therefore, it is possible to estimate the density of LRM using colour features of the wood using KayuSort, with the caveat that timber is kiln-dried to under 15% MC, freshly surfaced, without major defects and sapwood, and within the thickness range of 26.9 to 30.6 mm.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142925519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Wood density of 38 Dalbergia and 29 Diospyros Malagasy species and its relationship with climate and tree diameter 38种黄檀和29种马达加斯加木的木材密度及其与气候和树径的关系

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-03 DOI: 10.1007/s00107-024-02162-3

Andry Clarel Raobelina, Jean-Michel Leban, Caroline Christina Jaozandry, Tahiana Ramananantoandro

{"title":"Wood density of 38 Dalbergia and 29 Diospyros Malagasy species and its relationship with climate and tree diameter","authors":"Andry Clarel Raobelina, Jean-Michel Leban, Caroline Christina Jaozandry, Tahiana Ramananantoandro","doi":"10.1007/s00107-024-02162-3","DOIUrl":"10.1007/s00107-024-02162-3","url":null,"abstract":"<div><p>Several Malagasy <i>Dalbergia</i> and <i>Diospyros</i> species are highly valued, in the furniture industry despite limited understanding of their wood technological properties. This study contributes to address this gap by assessing the wood density (WD) of 38 <i>Dalbergia</i> and 29 <i>Diospyros</i> species, their radial WD variation, and the influence of climate and tree size on WD. WD was measured on 297 wood cores using X-ray computed tomography. One-way analysis of variance revealed that <i>Diospyros</i> genus (1.070 ± 0.165 g∙cm<sup>−3</sup>) has significantly denser heartwood compared to <i>Dalbergia</i> (0.961 ± 0.142 g∙cm<sup>−3</sup>)<i>.</i> Heartwood density also showed greater between-species variation, allowing the identification of eleven groups of <i>Dalbergia</i> and seven groups of <i>Diospyros</i>, each with significantly different heartwood density ranges. For radial density profile assessment, each of the 52 cores having the pith-to-bark part of the wood, was divided into ten equal length segments. Anova between mean WD of the core segments, combined with correlation tests between the average density of each segment and its distance from the pith, showed that radial wood density profile varied among species. Most species exhibited a decreasing radial WD profile. Correlation tests between tree diameter, climatic factors, and wood density demonstrated that, for both genera, wood density increases with rising temperature and decreasing precipitation at the growth site, while tree diameter has no significant effect on density. These findings significantly enrich the wood density database for Malagasy precious wood species, which previously existed for only a very few species.</p></div>","PeriodicalId":550,"journal":{"name":"European Journal of Wood and Wood Products","volume":"83 1","pages":""},"PeriodicalIF":2.4,"publicationDate":"2025-01-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912945","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Determination of the water diffusivity dependence with the flow rate using a DVS equipment 用DVS设备测定水扩散率与流速的关系

IF 2.4 3区农林科学

European Journal of Wood and Wood Products Pub Date : 2025-01-02 DOI: 10.1007/s00107-024-02182-z

Antoni Sánchez-Ferrer, Max Engelhardt

引用次数: 0