Forest Products Journal最新文献_第5页

Investigation of Thermal Effects on Nailed Connection of Mass Ply Panels 大体积胶合板钉扎连接的热效应研究

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-10-01 DOI: 10.13073/fpj-d-22-00039

Tu X. Ho, Detlef C. Laughery, Arijit Sinha

{"title":"Investigation of Thermal Effects on Nailed Connection of Mass Ply Panels","authors":"Tu X. Ho, Detlef C. Laughery, Arijit Sinha","doi":"10.13073/fpj-d-22-00039","DOIUrl":"https://doi.org/10.13073/fpj-d-22-00039","url":null,"abstract":"\u0000 Mass ply panels (MPP), a relatively new mass timber product, has been utilized in several construction projects as diaphragm and wall panels. Connection for MPP is a crucial structural component that requires a better understanding. This article presents an experimental investigation into elevated temperature exposure–driven property degradation of MPP nailed connections, which is important for both the design of new structures in terms of fire resistance and the rehabilitation of structures partially damaged by fire. One control group and 32 exposure groups, which were combinations of eight elevated temperatures and four exposure durations, were investigated. The failure modes and yield strength of the nailed connection were analyzed as a function of elevated temperature and exposure time and compared with the prediction from the National Design Specification and existing literature. The results show a decrease of up to 45 percent in initial stiffness and ultimate load; meanwhile, there was no statistical evidence for the change in yield load in the majority of testing groups. Two analytical models, namely, multilinear regression and first-order kinetics model, were proposed to model the degradation of initial stiffness and ultimate strength. The kinetics model provided a better prediction and suggested that the initial stiffness and ultimate strength of the nail connection degraded over time at rates depending on the exposure temperature.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46504559","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

Influence of Critical Synthesis Parameters and Precursor Stabilization on the Development of Adhesive Strength in Fructose–HMF–Amine Adhesives* 关键合成参数和前体稳定性对果糖-HMF-胺胶粘剂粘合强度发展的影响*

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-07-01 DOI: 10.13073/fpj-d-22-00040

Wilfried Sailer‐Kronlachner, Catherine Rosenfeld, J. Konnerth, H. V. van Herwijnen

{"title":"Influence of Critical Synthesis Parameters and Precursor Stabilization on the Development of Adhesive Strength in Fructose–HMF–Amine Adhesives*","authors":"Wilfried Sailer‐Kronlachner, Catherine Rosenfeld, J. Konnerth, H. V. van Herwijnen","doi":"10.13073/fpj-d-22-00040","DOIUrl":"https://doi.org/10.13073/fpj-d-22-00040","url":null,"abstract":"The synthesis of an adhesive composed of fructose, hydroxymethylfurfural (HMF), and bishexamethylene triamine was optimized. The intended application of the adhesive is the production of wood composites such as particleboard or medium-density fiberboard. Adhesives synthesized using HMF-rich precursors produced in continuous and batch systems were compared in regard to their tensile shear strength development; no significant differences could be found. The use of sodium dithionite for HMF stabilization during precursor production led to lower resin viscosities, whereas no significant influence on the adhesive strength development was measured. Variation of the critical synthesis parameters' reaction temperature and reaction atmosphere allowed the production of an adhesive with similar or even faster strength development than commercially used urea–formaldehyde adhesives. The ideal reaction temperature was found to be 60°C. Adhesive synthesis under nitrogen atmosphere shifts the curing reaction to lower temperatures, which was demonstrated by differential scanning calorimetry measurements, but did not improve the overall strength development of the adhesive system.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46398173","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

Analysis of Future Prospects and Opportunities for Wood Adhesives: A Review* 木材胶粘剂的发展前景与机遇分析*

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-07-01 DOI: 10.13073/fpj-d-23-00011

C. Hunt, M. Dunky

{"title":"Analysis of Future Prospects and Opportunities for Wood Adhesives: A Review*","authors":"C. Hunt, M. Dunky","doi":"10.13073/fpj-d-23-00011","DOIUrl":"https://doi.org/10.13073/fpj-d-23-00011","url":null,"abstract":"\u0000 This paper addresses strengths, weaknesses, opportunities, and threats of the wood adhesives industry as discussed at the International Conference on Wood Adhesives in May 2022. The authors have organized the points made during the discussion and added further facts, assumptions, and conclusions to provide context and perspective, even surpassing the outcome of the discussion. The biggest themes of the discussion were the unprecedented opportunity for adhesives to enable forest products to supply society's surging demand for renewable materials and the challenges in meeting those demands. We see excellent opportunities for wood-based panels and with this, for wood adhesives. The abundant challenges to bio-based adhesives for wood products are highlighted by the large amount of research and commercial effort compared with the small volumes of bio-based adhesives in use. Other threats to the adhesive and bonded products industries include aversion to any chemicals (even stable adhesives), and lack of experienced work force. Wood adhesives underwent significant changes in the past decades, mainly focused on reducing emissions during panel use. Wood use in construction will be boosted by efforts to fulfil the European Green Deal, as implemented in the New European Bauhaus and European Renovation Wave.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42388593","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

Application of Soy Flour Modified Resins to Hot and Cold Pressed Veneer* 大豆粉改性树脂在冷热压单板中的应用*

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-07-01 DOI: 10.13073/fpj-d-22-00073

O. Asafu-Adjaye, A. Alawode, B. Via, Sujit Banerjee

引用次数: 0

An Examination of Excess Wood Pellet Supply in the United States 对美国木屑颗粒供应过剩的调查

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-05-19 DOI: 10.13073/fpj-d-22-00066

Filiz Guneysu Atasoy, Daowei Zhang, Jeffrey P. Prestemon

引用次数: 0

Determination of Geographical Origin and Tree Species Using Vis-NIR and Chemometric Methods 用可见光-近红外光谱和化学计量学方法测定地理来源和树种

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-05-01 DOI: 10.13073/fpj-d-22-00011

Ying Li, B. Via, Yaoxiang Li, Guozhong Wang

{"title":"Determination of Geographical Origin and Tree Species Using Vis-NIR and Chemometric Methods","authors":"Ying Li, B. Via, Yaoxiang Li, Guozhong Wang","doi":"10.13073/fpj-d-22-00011","DOIUrl":"https://doi.org/10.13073/fpj-d-22-00011","url":null,"abstract":"\u0000 The variation of wood properties between different geographical origin and tree species has an important influence on end use applications. This study aimed to investigate the feasibility of wood origin and species classification based on visible and near infrared spectroscopy and chemometric methods. The influence of geographical origin on tree species identification also was analyzed. A total of 530 samples with 2 origins and 5 tree species were collected for analysis. The raw reflectance spectra were preprocessed by spectral transformation technique, and nonlinear discrimination models were built by support vector machine (SVM) using various spectral forms. Three algorithms—grid search (GS), genetic algorithm (GA), and particle swarm optimization (PSO)—were applied to optimize the parameters of SVM models, respectively. Regardless of spectral forms and optimization techniques, the prediction accuracy was lower than that of the calibration set for wood origin and tree species identification. Except for reflectance spectra, prediction accuracy of 100 percent was obtained based on SVM in combination with three algorithms for origin discrimination. However, SVM in combination with reflectance spectra and GS technique achieved the best prediction accuracy (93.18%) for tree species identification. These results demonstrated that visible and near infrared spectroscopy combined with chemometric techniques can be used for geographical origin and tree species determination.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42351621","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

Investigating Soil Effects on Outcomes of a Standardized Soil–Block Test 研究土壤对标准化土块试验结果的影响

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-05-01 DOI: 10.13073/fpj-d-22-00020

Chi-Jui (Barry) Kuo, Mark J. Kimsey, D. Page-Dumroese, G. Kirker, A. Fu, Lili Cai

{"title":"Investigating Soil Effects on Outcomes of a Standardized Soil–Block Test","authors":"Chi-Jui (Barry) Kuo, Mark J. Kimsey, D. Page-Dumroese, G. Kirker, A. Fu, Lili Cai","doi":"10.13073/fpj-d-22-00020","DOIUrl":"https://doi.org/10.13073/fpj-d-22-00020","url":null,"abstract":"\u0000 Soil physical and chemical properties play important roles in mass loss during soil–block tests but the relationship between soil properties and the decay caused by brown-rot and white-rot fungi remains unclear. The objective of this study was to investigate the soil effects on the decay resistance of pine (Pinus spp.) and poplar (Liriodendron tulipifera L.) blocks. The properties of soil from nine different sources (six from Idaho, one from Mississippi, one from Wisconsin, and one from Oregon) were characterized for soil texture, sieved bulk density, water-holding capacity, pH, organic matter, and carbon and nitrogen concentrations. The moisture content and mass loss of decayed wood samples after 8 weeks of fungal exposure were measured. At the end of the study, block moisture ranged from 30 to 200 percent and mass loss ranged from 20 to 60 percent. Despite using a range of soils, there were no direct correlations between soil properties and wood-block moisture content or mass loss. Moreover, among all the soil properties examined, no significant effect of a single soil property on wood-block moisture content and mass loss was measured. Instead, the combined effects of soil physical and chemical properties may interact to govern the decay of wood blocks in the laboratory soil–block test.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44131225","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

Evaluation of Kiln Heating as a Phytosanitary Treatment for Ceratocystis-Infested ‘Ōhi‘a (Metrosideros polymorpha) Wood 窑内加热处理角藻病' Ōhi ' a木材的植物检疫评价

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-05-01 DOI: 10.13073/fpj-d-22-00024

M. Hughes, J. Juzwik, Zhang-jing Chen, B. Luiz, L. Keith

引用次数: 0

Efficacy of Ethanedinitrile against Pinewood Nematode in Woodchips under Field Conditions 乙二腈对松材木片线虫的田间防治效果研究

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-05-01 DOI: 10.13073/fpj-d-22-00033

M. C. Stevens, W. Ye, S. Thalavaisundaram

引用次数: 0

An Analysis of U.S. Hardwood Log Exports from 1990 to 2021 1990年至2021年美国硬木原木出口分析

IF 0.9 4区农林科学

Forest Products Journal Pub Date : 2022-05-01 DOI: 10.13073/fpj-d-22-00035

W. Luppold, M. Bumgardner, Michael Jacobson

{"title":"An Analysis of U.S. Hardwood Log Exports from 1990 to 2021","authors":"W. Luppold, M. Bumgardner, Michael Jacobson","doi":"10.13073/fpj-d-22-00035","DOIUrl":"https://doi.org/10.13073/fpj-d-22-00035","url":null,"abstract":"\u0000 In 1990, the major destinations for hardwood logs exported by the United Sates were Europe, Canada, and three East Asian markets: Japan, Taiwan, and Korea. From 1990 to 2005, the volume of hardwood logs exported to Canada increased by 402 percent. During this period, another East Asian log market developed, consisting of China, Hong Kong, and Vietnam (CHV). While increased Canadian exports were an apparent result of increased U.S. bilateral trade with Canada, the development of the CHV market was associated with increased U.S. furniture imports from that region. The volume of U.S. log exports worldwide peaked in 2005, and the value of log exports peaked in 2007. Exports to all regions declined in 2009. After 2009, exports to CHV increased and surpassed shipments to Canada in 2014. In the past decade, much of the increase in exports to CHV appears to be the result of demand within China. Recently, these exports have been affected by trade disputes and the COVID-19 pandemic. For most of the study period, the dominant log export species were white oak, red oak, maple, or cherry in terms of value. Since 2018, walnut has become the most important log export species (value basis) as a result of increased shipments to China.","PeriodicalId":12387,"journal":{"name":"Forest Products Journal","volume":" ","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44369140","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