Journal of the Institute of Wood Science最新文献

A new beginning 一个新的开始

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009x12602061949518

D. King

引用次数: 0

Determination of major non-development criteria for Iranian particle board industry by applying analytic hierarchy process 运用层次分析法确定伊朗刨花板行业主要非发展标准

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100262394

M. Azizi

{"title":"Determination of major non-development criteria for Iranian particle board industry by applying analytic hierarchy process","authors":"M. Azizi","doi":"10.1179/002032009X12536100262394","DOIUrl":"https://doi.org/10.1179/002032009X12536100262394","url":null,"abstract":"Abstract Development trend of Iranian particleboard industry is not satisfactory. Effective indicators in non-development of the industry were divided into five major groups, i.e. by economic, raw material and product, social, technical and man power, rules and regulation plus 23 subsections. After obtaining the two-by-two comparisons of the mentioned criteria and subsections from the experts in the industry, their weighting values were calculated using the analytical hierarchy process (AHP) while group decision making were conducted using Expert Choice software. The results of this study showed that inconsistency ratio for all average comparison matrices are smaller than 0.1 and the overall inconsistency ratio is 0.02. Therefore, the judgments in current study have high consistency. Moreover, the results indicated that among 23 effective sub-criteria in non development of the industry, the following sub-criteria had the highest priority respectively: Lack of raw material, non-expert elements, lower production quality, changing of management, long decision making process and ancient technology. Feasible solutions have been suggested to develop of the industry.","PeriodicalId":154257,"journal":{"name":"Journal of the Institute of Wood Science","volume":"371 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123389229","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: 1

Mechanical characteristics of wood biscuit joints 木质饼干接头的力学特性

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100262033

R. Hussein, An. Tangt

{"title":"Mechanical characteristics of wood biscuit joints","authors":"R. Hussein, An. Tangt","doi":"10.1179/002032009X12536100262033","DOIUrl":"https://doi.org/10.1179/002032009X12536100262033","url":null,"abstract":"Abstract Wood biscuit joints are commonly used to join particleboard and medium density fibreboard (MDF) panels. This paper describes the mechanical characteristics of biscuit joints. Specifically, the moment of resistance and bending stiffness of biscuit joints are evaluated. Centre to centre spacing between the biscuit holes, edge distances between the centres and the corresponding edge of board, the type of loading as compression and tension loads, the type of composite materials, and glue effects are taken into consideration. The experimental results indicate that gluing of the face and butt members significantly affect joint strength. The maximum bending moment for particleboard joints was 5.74 Nm under tension and 6.0 Nm under compression. These values were 5.39 Nm and 4.69 Nm, respectively for MDF joints. In addition, the experimental results also indicate that biscuit joints in particleboard panels are stronger than those in MDF panels. The former tensile strength was 7.4% and the compression strength was 29.9% higher than the latter. However, the biscuit joints in MDF panels were found to be stiffer than those in particleboard panels by an average of 11%. The on-centre spacing between biscuits had insignificant effects on the joint tensile and compressive strengths of the joints. This discovery is useful for the manufacturing industries where fewer biscuits can be used and time and cost can be saved. Finally, the experimental results suggest that the bending strength of glued and unglued joints is inversely related to the spacing between the centres of the biscuit holes and the edge distance between the holes and the board edge.","PeriodicalId":154257,"journal":{"name":"Journal of the Institute of Wood Science","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116330686","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

Thermal treatment of Nigerian-grown Albizzia zygia and Funtumia elastica wood in soy oil medium Part 2: Effects on hygroscopic, swelling and surface properties 尼日利亚产合欢和弹性木在豆油介质中的热处理。第2部分:对吸湿性、溶胀性和表面性能的影响

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100262556

L. Awoyemi

{"title":"Thermal treatment of Nigerian-grown Albizzia zygia and Funtumia elastica wood in soy oil medium Part 2: Effects on hygroscopic, swelling and surface properties","authors":"L. Awoyemi","doi":"10.1179/002032009X12536100262556","DOIUrl":"https://doi.org/10.1179/002032009X12536100262556","url":null,"abstract":"Abstract Thermal treatment in soy oil medium is one of the techniques used as a substitute for chemical treatment in wood preservation. However, the effects of this technique vary from one species to another and hence the need to investigate the response of individual species to it. Thermal treatment of air-dried Nigerian-grown Albizzia zygia and Funtumia elastica wood was carried out in a vessel containing soy oil at a temperature of 220°C for 2hours. This was followed by the determination of hygroscopy and swelling by water soaking method; surface energy by the sessile drop contact angle method; pH and buffer capacity by the cold extraction method. The process of soy oil thermal treatment resulted in significant reductions in hygroscopy, swelling properties and pH in both species with accompanying increase in buffer acid and alkaline buffer capacity. The surface energy which is an indication of wettability was reduced in Albizzia zygia but increased in Funtumia elastica. The reductions in hygroscopy and pH are indications of cellulose degradation during the heat treatment process leading to build up of acid formation. The reduction in hygroscopic behaviour indicates potential for stability in wood-water relationship especially when the material will be used in a continuously-changing ambient environment. The reduction in surface energy in Albizzia zygia implies that soy-oil-thermally modified wood from this species will have reduced interfacial attractions with most chemical adhesives. On the other hand, the increase in surface energy in Funtumia elastica shows possibility of improvement in the level of interfacial attractions between wood (substrates) and adhesives. The reduction in pH in both species is expected to have a two-way effect; a benefit through reduction in adhesive curing time and an adverse effect through expected reduction in strength properties.","PeriodicalId":154257,"journal":{"name":"Journal of the Institute of Wood Science","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121660769","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

Classification of forest products in Greece: the case of wood flooring 希腊森林产品的分类:以木地板为例

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100262231

M. Skarvelis, A. Papadopoulos

引用次数: 0

Differential response of heartwood and sapwood to heat treatment. Part 1: strength properties 心材和边材对热处理的不同反应。第1部分:强度特性

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100261917

L. Awoyemi

{"title":"Differential response of heartwood and sapwood to heat treatment. Part 1: strength properties","authors":"L. Awoyemi","doi":"10.1179/002032009X12536100261917","DOIUrl":"https://doi.org/10.1179/002032009X12536100261917","url":null,"abstract":"Abstract The transition from sapwood to heartwood is characterised by several changes including increasing acidity. On the basis of the strong correlation, which has been established between strength reduction and wood acidity during heat treatment, the differences in the response of heartwood and sapwood strength properties were investigated. Heartwood and sapwood samples obtained from one board of Scots pine (Pinus sylvestris) were heat-treated and their strength properties compared. There was 15.8% and 3.3% reduction in modulus of elasticity in the heartwood and sapwood respectively while the loss in modulus of rupture is 32.9% and 15.6% in the heartwood and sapwood respectively. The lower reductions in the strength properties in the sapwood compared to the heartwood indicate that the former is less amenable to heat treatment than the latter. This is probably due to the higher acidity of the former, which could have resulted in higher degree of degradation, higher cellulose crystallinity and consequently higher strength reduction. Therefore the effects of heat treatment on wood especially the strength properties depends on the proportions of heartwood and sapwood.","PeriodicalId":154257,"journal":{"name":"Journal of the Institute of Wood Science","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124497373","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: 1

Discolouration during kiln drying of South African Pinus elliottii 南非湿地松干燥过程中的变色现象

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100262312

G. Scheepers, N. L. Roux, S. Gardner, T. Rypstra

{"title":"Discolouration during kiln drying of South African Pinus elliottii","authors":"G. Scheepers, N. L. Roux, S. Gardner, T. Rypstra","doi":"10.1179/002032009X12536100262312","DOIUrl":"https://doi.org/10.1179/002032009X12536100262312","url":null,"abstract":"Abstract The effect of different parameters on the surface discolouration (yellow stain and kiln brown stain) and thermal discolouration of Pinus elliottii during kiln drying was investigated. Boards were dried with different kiln schedules and discolouration was assessed at different depth levels from the surface of each board. The discolouration data were analysed using notched boxplots, multivariate analysis of variance and canonical variate analysis biplots. Thermal and surface discolouration were distinguishable by the distribution of colour data point plots in the CIE-L*a*b* colour system. Thermal discolouration was less intense and less varied than surface discolouration. The greatest degree of thermal discolouration occurred in one of the higher temperature (Tdb≥90°C during first drying phase) schedules that was run for an excessively long period due to low air velocity. Discolouration progressively decreased as the boards were planed to a greater depth. Higher temperature schedules yielded 77.5-82.5% discoloured replicates at the 2 mm depth level. Lower temperature (Tdb≤71°C during first drying phase) schedules yielded no discoloured wood at the surface or at the centre of the boards.","PeriodicalId":154257,"journal":{"name":"Journal of the Institute of Wood Science","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127716705","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

Radial and axial variation in specific gravity and anatomical properties of plantation grown Eucalyptus citriodora Hook 人工林桉树比重和解剖特性的径向和轴向变化

Journal of the Institute of Wood Science Pub Date : 2009-11-01 DOI: 10.1179/002032009X12536100262150

S. Shashikala, R. Rao

引用次数: 8

Moisture adsorption behaviour of decayed rubber wood 腐烂橡胶木的吸湿特性

Journal of the Institute of Wood Science Pub Date : 2009-10-01 DOI: 10.1179/002032009X12536100261953

S. Chauhan, H. Nagaveni

引用次数: 6

Utilisation of biofuels from forest products residues in the periphery of Eastern Macedonia and Thrace, Greece 利用东马其顿和希腊色雷斯周边的森林产品残留物生产生物燃料

Journal of the Institute of Wood Science Pub Date : 2009-10-01 DOI: 10.1179/002032009X12536100262439

A. Papadopoulos, A. Gkaraveli, T. Merou

引用次数: 0