Maderas-ciencia Y Tecnologia最新文献_第3页

Effect of natural aging on selected properties of wooden facade elements made of scots pine and chestnut 自然老化对苏格兰松和栗子木制立面元素选择性能的影响

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100418

Elif Topaloglu

{"title":"Effect of natural aging on selected properties of wooden facade elements made of scots pine and chestnut","authors":"Elif Topaloglu","doi":"10.4067/s0718-221x2023000100418","DOIUrl":"https://doi.org/10.4067/s0718-221x2023000100418","url":null,"abstract":"Identifying wood species of each wood element of a historical wooden building and investigating the changes in wood properties due to exposed outdoors during its service life are important prerequisites for the maintenance and renovation of historical wooden buildings. In the present study, the changes in wood properties occurring during natural aging of two facade elements taken from a traditional house, which has a service life of approximately 100 years, were investigated. Destructive tests were used for the experiments. The wood species, moisture content, wood density, water absorption rate and chemical structure of both facade elements were determined. Microscopic analysis revealed that the molding was made from the wood of Scots pine ( Pinus sylvestris ) and the window jamb was made from chestnut ( Castanea sativa ). It was found that the cellulose and lignin on the outer surface of aged woods of both facade elements were degraded according to the FTIR analysis. The moisture and density values of aged wood for both facade elements were smaller than those of recent wood. The water absorption rates of aged woods of both molding and window jamb increased with natural aging.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"96 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81884107","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

Effect of chip temperature during bonding on particleboard properties 粘接过程中切屑温度对刨花板性能的影响

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100417

A. Istek, Özgür Yiğittap, İsmail Özlüsoylu

引用次数: 1

Variations in decay resistance of Cryptomeria fortunei 柳杉耐腐性的变异

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100413

Liao Xiaoping, Li Chunli, J. Morrell, He Haishan, Qiu Jian, Zhang Neng

{"title":"Variations in decay resistance of Cryptomeria fortunei","authors":"Liao Xiaoping, Li Chunli, J. Morrell, He Haishan, Qiu Jian, Zhang Neng","doi":"10.4067/s0718-221x2023000100413","DOIUrl":"https://doi.org/10.4067/s0718-221x2023000100413","url":null,"abstract":"Cryptomeria fortunei has been widely planted in many cities in southern China. Eventually some of this material may be utilized for timber, but there are relatively few studies of durability of this resource. There is also some question as to whether Cryptomeria fortunei is a synonym for Cryptomeria japonica or Japanese cedar (Sugi). Evaluating the durability of the Chinese resource will help ensure that the decay resistance of this urban plantation resource is properly categorized. The decay resistance of Cryptomeria fortunei wood was assessed in soil block and agar block tests against Trametes versicolor , Gloeophyllum trabeum and Rhodonia placenta . Hot water and ethanol extractive contents of the heartwood were determined on sections from various distances above ground and then FTIR spectroscopy was used to characterize the wood before and after fungal exposure. Weight losses in sapwood were consistent with the minimal decay resistance of this por-tion of the wood. Inner and outer heartwood weight losses were more variable suggesting that the heartwood of this species would be considered to be only moderately durable. Extractives were weakly correlated with decay resistance. FTIR results were more variable, although they suggested heavier attack of lignin components by the brown rot fungi. The results suggest that Cryptomeria fortunei would need to be protected from the weather unless supplemental preservative treatments were applied.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"1 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82286339","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

Mechanical behaviour of grapevine wood affected by Xylotrechus arvicola 木虱对葡萄木材力学性能的影响

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100416

Á. Rodríguez‐González, P. Casquero, J. A. Pereira, Ó. González‐López, M. Guerra, J. García-González, J. M. M. Pozo, A. Juan-Valdés

引用次数: 0

Characterisation of lignins isolated from Bamboo organosolv and kraft black liquor 竹材有机溶剂和硫酸盐黑液中木质素的分离与表征

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100415

N. A. Sadiku, Abdulazeez Faruq Yusuph

{"title":"Characterisation of lignins isolated from Bamboo organosolv and kraft black liquor","authors":"N. A. Sadiku, Abdulazeez Faruq Yusuph","doi":"10.4067/s0718-221x2023000100415","DOIUrl":"https://doi.org/10.4067/s0718-221x2023000100415","url":null,"abstract":"Bamboo biomass was pulped using organosolv methods: Acetic acid and formic acid; hydrogen peroxide and formic acid; ethanol and water and kraft process with varying concentrations of the cooking chemicals. The properties of the isolated lignin were influenced by the black liquor pH as well as the pulping method. Highest pH (12,8) was recorded for kraft at 70:30 liquor concentration while lowest pH of 2,5 was recorded for both Aceticformic (70:30) and Ethanol/water (70:30 and 60:40). There were obvious differences in the characteristic colours, shapes and sizes of the lignin samples. Bamboo kraft lignin samples formed large pieces much easier than that of Organosolv. Aceticformic (70:30) had the best filteration properties (FC) while Etha - nol/water had the poorest. Generally, kraft recorded the highest lignin yield while all the organosolv processes recorded reduced yield. Highest yield (119,25 g/L) was gotten from kraft (50:50) while Peroxyformic (60:40) had the lowest yield of 8,20 g/L. The results showed that higher liquor pH favours total dissolved solid as well as lignin precipitation. As the pH increases, total dissolved solid, yield, Klason and low molecular weight (LMW) lignin content increases while FC decreases. The Klason and LMW lignin content increased with incresing lignin yield.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"38 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88277665","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

Sampling sufficiency for mechanical properties of wood 木材机械性能取样充分性

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100411

Arthur B. Aramburu, D. Gatto, R. Beltrame, R. Delucis

引用次数: 0

Particleboard experimental production with bamboo, pine and mate for one product of new applications 实验生产的刨花板以竹木、松木和马黛木为一体，为产品的新应用

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2023-03-01 DOI: 10.4067/s0718-221x2023000100414

Fernando Rusch, É. Hillig, Erick Chagas Mustefaga, R. Trevisan, José Guilherme Prata, G. M. Miranda

引用次数: 0

Effects of glue spreading rate and veneer density on sugi (Cryptomeria japonica) plywood adhesive penetration 涂胶速率和贴面密度对杉木胶合板胶粘剂渗透的影响

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2022-12-01 DOI: 10.4067/s0718-221x2023000100408

A. Apsari, Takashi Tanaka

{"title":"Effects of glue spreading rate and veneer density on sugi (Cryptomeria japonica) plywood adhesive penetration","authors":"A. Apsari, Takashi Tanaka","doi":"10.4067/s0718-221x2023000100408","DOIUrl":"https://doi.org/10.4067/s0718-221x2023000100408","url":null,"abstract":"An optimum adhesive penetration is needed to provide satisfactory bonding strength at the veneer-veneer interface. The effect of veneer density and glue spreading rate on the phenol formaldehyde adhesive penetra - tion plot profile was determined. An X-ray apparatus was used to visualize the adhesive penetration of the ply - wood. The heartwood and sapwood veneer of Cryptomeria japonica with low, medium, and high veneer densi - ties were made into plywood. The glue spreading rate was applied from 75 g/m 2 to 225 g/m 2 for the heartwood plywood and up to 300 g/m 2 for the sapwood plywood (plus 75 g/m 2 at every level of glue spreading rate). An X-ray apparatus with a low tube voltage successfully visualized the adhesive penetration plot profile. Based on the half-width calculation, the adhesive penetration depth ranged from 0,3 - 0,9 mm. The mean half-width was 0,5 mm. The adhesive concentration increased with increasing glue spreading rate. In contrast, it also showed that using different veneer densities and increasing glue spreading rates does not affect the half-width value as the adhesive penetrates deeper.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"6 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89902056","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 the multiday and continuous hot press on the physical, mechanical and formaldehyde emission properties of the particleboard 多日连续热压对刨花板物理、机械和甲醛释放性能的影响

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2022-12-01 DOI: 10.4067/s0718-221x2023000100407

Osman Çamlıbel

{"title":"Influence of the multiday and continuous hot press on the physical, mechanical and formaldehyde emission properties of the particleboard","authors":"Osman Çamlıbel","doi":"10.4067/s0718-221x2023000100407","DOIUrl":"https://doi.org/10.4067/s0718-221x2023000100407","url":null,"abstract":"In this study, Its the influence of according to press, particleboards produced in two different press types which were multiday and continuous hot press, the thickness, density, bending strength, modulus of elasticity, internal bond, surface soundness, withdrawal of screw resistance, moisture, thickness swelling, water absorp - tion, formaldehyde emission content were researched. 18 mm x 2100 mm x 2800 mm size particleboards were manufactured on the production line which was using urea-formaldehyde (F:U;1,07 moles), and 30 % pine, 40 % oak, 20 % beech and 10 % poplar waste mixture of the wood materials. According to results of the tests performed after the multiday and continuous hot press production of the boards; thickness (0,63 %), bending strength (1,27 %), moisture content (0,47 %), thickness swelling (37 %), and water absorption (39,9 %), modu - lus of elasticity (11,35 %), internal bond (7,22 %) were increased according to multiday hot press while density (2,7 %), surface soundness (18,81 %), withdrawal of screw resistance (14 %) and formaldehyde (57,12 %) decreased. Formaldehyde content,surface soundness, withdrawal of screw resistance are the most prominent properties influenced by continuous hot press.","PeriodicalId":18092,"journal":{"name":"Maderas-ciencia Y Tecnologia","volume":"32 1","pages":""},"PeriodicalIF":1.5,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87943541","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

Quality characteristics of the selected variant of Paulownia tomentosa (Robust4) wood cultivated in Hungary 匈牙利种植的泡桐(Robust4)木材的品质特征

IF 1.5 4区农林科学

Maderas-ciencia Y Tecnologia Pub Date : 2022-12-01 DOI: 10.4067/s0718-221x2023000100401

Szabolcs Koman

引用次数: 0