Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.612624
Eliška Hřebenářová, F. Wald
The paper discusses mechanical properties of timber for structures –most frequently used spruce wood, historically used oak wood and rarely mentioned larch wood. The main focus is on larch wood extracted from the ceilingof an immovablecultural monument from the 17thcentury –the determination of its age, its historicalimportance and mechanical properties. Mechanical properties were obtained by the standard tests in compressionparallel and perpendicular to the fibres and in bending. The results of tests are compared to the mechanical properties of oak wood, of commonly used spruce wood and of recently felled larch wood.
{"title":"COMPARISON OF MECHANICAL PROPERTIES OF THE ELDEST LARCH WOOD CONSTRUCTION WITH OAK WOOD AND SPRUCE WOOD","authors":"Eliška Hřebenářová, F. Wald","doi":"10.37763/wr.1336-4561/67.4.612624","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.612624","url":null,"abstract":"The paper discusses mechanical properties of timber for structures –most frequently used spruce wood, historically used oak wood and rarely mentioned larch wood. The main focus is on larch wood extracted from the ceilingof an immovablecultural monument from the 17thcentury –the determination of its age, its historicalimportance and mechanical properties. Mechanical properties were obtained by the standard tests in compressionparallel and perpendicular to the fibres and in bending. The results of tests are compared to the mechanical properties of oak wood, of commonly used spruce wood and of recently felled larch wood.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127210830","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}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.648660
Song Xiaozhou, Liu Guorui, Feng Xuechun, Zhangyi Li
In this paper, acidified chitosan was used as an adhesive to prepare aldehyde-free, environmentally-friendly agglomerated cork panels by hot-pressing. After preparation, thephysical, mechanical, and the finishing properties of the chitosan-glued agglomerated cork panels were investigated. The optimal mass ratio of acetic acid solution (1wt.%) to chitosan was determined to be 30:1. The resulting hot-pressed agglomerated cork panels, which featured adensity of 0.55 g.cm-3and a thickness of 4 mm, exhibited a tensile strength of 1.70 MPa and athermal conductivity of 0.11W.m-1·K-1. The agglomerated cork panels coated with theoil-based polyurethane and water-based, acrylic-modified polyurethane paints exhibited significantly lower lightness and higher glossiness. The total color differences (ΔE*) ofboth agglomerated cork panels increased before and after finishing. The oil-based polyurethane paint coating exhibited high adhesion of paint film, reaching a level-0 adhesion, while thewater-based, acrylic-modified polyurethane paint coating achieved a level-1 adhesion. Theabrasion resistance results showed that the substrates of cork agglomerates coated two types of paint did not expose after undergoing abrasion for 100 revolutions atthe turntable speed of 60 rpm.
{"title":"PREPARATION AND PROPERTIES OF AGGLOMERATED CORK PANELS BOUND WITH CHITOSAN BINDER","authors":"Song Xiaozhou, Liu Guorui, Feng Xuechun, Zhangyi Li","doi":"10.37763/wr.1336-4561/67.4.648660","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.648660","url":null,"abstract":"In this paper, acidified chitosan was used as an adhesive to prepare aldehyde-free, environmentally-friendly agglomerated cork panels by hot-pressing. After preparation, thephysical, mechanical, and the finishing properties of the chitosan-glued agglomerated cork panels were investigated. The optimal mass ratio of acetic acid solution (1wt.%) to chitosan was determined to be 30:1. The resulting hot-pressed agglomerated cork panels, which featured adensity of 0.55 g.cm-3and a thickness of 4 mm, exhibited a tensile strength of 1.70 MPa and athermal conductivity of 0.11W.m-1·K-1. The agglomerated cork panels coated with theoil-based polyurethane and water-based, acrylic-modified polyurethane paints exhibited significantly lower lightness and higher glossiness. The total color differences (ΔE*) ofboth agglomerated cork panels increased before and after finishing. The oil-based polyurethane paint coating exhibited high adhesion of paint film, reaching a level-0 adhesion, while thewater-based, acrylic-modified polyurethane paint coating achieved a level-1 adhesion. Theabrasion resistance results showed that the substrates of cork agglomerates coated two types of paint did not expose after undergoing abrasion for 100 revolutions atthe turntable speed of 60 rpm.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134466825","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}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.661670
KANG ZHOU, Zirui Ren, Chen Shuosun, B. Na
Parallel strand lumber (PSL) was manufactured from the veneer strand cut from the poplar broken veneers of the plywood enterprises, by analyzing the influence of the size of veneer strands, the glue concentration and glue-applying time on the glue-absorbing amount of veneer strands, the influence of three different glue-applying was, hot-pressing time and temperature on the physical and mechanical properties of PSL was reviewed and the hot-pressing technology was optimized. The experiment results showed that the size of the veneer strands have not notableinfluence on the gluing-absorbing amount, and mainly affect the homogeneity and appearance quality of the product. The glue concentration is one main factor to affect theglue-absorbing amount of veneer strands and PF resin of 30% concentration was chosen. The glue-applying way is the main factor to affect the mechanical property of PSL. Thehot-pressing time and temperature have significant influence on physical and mechanical properties of PSL. Comprehensively considering, the physical and mechanical properties and homogeneity of products are better using the veneer strands with 100 mm length, theglue-spraying way and hot-pressing technology with the time 35 min and thetemperature of 150°C.
{"title":"THE STUDY ON GLUE-APPLYING METHODS AND HOT-PRESSING TECHNOLOGY OF PARALLEL STRAND LUMBER","authors":"KANG ZHOU, Zirui Ren, Chen Shuosun, B. Na","doi":"10.37763/wr.1336-4561/67.4.661670","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.661670","url":null,"abstract":"Parallel strand lumber (PSL) was manufactured from the veneer strand cut from the poplar broken veneers of the plywood enterprises, by analyzing the influence of the size of veneer strands, the glue concentration and glue-applying time on the glue-absorbing amount of veneer strands, the influence of three different glue-applying was, hot-pressing time and temperature on the physical and mechanical properties of PSL was reviewed and the hot-pressing technology was optimized. The experiment results showed that the size of the veneer strands have not notableinfluence on the gluing-absorbing amount, and mainly affect the homogeneity and appearance quality of the product. The glue concentration is one main factor to affect theglue-absorbing amount of veneer strands and PF resin of 30% concentration was chosen. The glue-applying way is the main factor to affect the mechanical property of PSL. Thehot-pressing time and temperature have significant influence on physical and mechanical properties of PSL. Comprehensively considering, the physical and mechanical properties and homogeneity of products are better using the veneer strands with 100 mm length, theglue-spraying way and hot-pressing technology with the time 35 min and thetemperature of 150°C.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131274247","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}
Pub Date : 2022-08-11DOI: 10.37763/wr.1336-4561/67.4.558567
E. Jang, C. Kang
This study focused on Duabanga moluccana, which is a fast-growing tropical tree native to Southeast Asia. Duabanga moluccana cross sectional specimens were analyzed to gas permeability, pore size, and open-pore porosity and also measured its sound absorption coefficients with an impedance tube. Duabanga moluccanashowed a larger pore size and greater open-pore porosity than other hardwood species, and its sound absorbing performance was superior to that of the gypsum board currently used as a commercial ceiling material. Although this was a laboratory-scale investigation, we demonstrate that Duabanga moluccanacross sections have potential as a natural sound absorbing functional building material.
{"title":"INVESTIGATION ON THE MALYSIAN DUABANGA MOLUCCANA CROSS SECTIONS AS SOUND ABSORBING FUNCTIONAL MATERIALS","authors":"E. Jang, C. Kang","doi":"10.37763/wr.1336-4561/67.4.558567","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.4.558567","url":null,"abstract":"This study focused on Duabanga moluccana, which is a fast-growing tropical tree native to Southeast Asia. Duabanga moluccana cross sectional specimens were analyzed to gas permeability, pore size, and open-pore porosity and also measured its sound absorption coefficients with an impedance tube. Duabanga moluccanashowed a larger pore size and greater open-pore porosity than other hardwood species, and its sound absorbing performance was superior to that of the gypsum board currently used as a commercial ceiling material. Although this was a laboratory-scale investigation, we demonstrate that Duabanga moluccanacross sections have potential as a natural sound absorbing functional building material.","PeriodicalId":329192,"journal":{"name":"WOOD RESEARCH 67(4) 2022","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127727906","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}
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