Pub Date : 2022-12-13DOI: 10.37763/wr.1336-4561/67.6.979993
Guan Shili, Liang Youzhen, Wang Jun, Lu Lixin, Hou Xue
In this paper, the energy absorption of single-wall corrugated fibreboard with a trapezoidal core under edgewise crushing load was studied experimentally and analytically, and a physical surfacebonding was assumed to represent the interaction between the fluted board and thelinerboard based on the production process of corrugated fibreboards. Anew folding element was proposed, including two boards and two trapezoidal corrugated cores with central symmetry. Moreover, three folding modes of the fluted board were proposed based on experimental phenomena, and a plateau stress model was characterized by the geometry parameters of the corrugated fibreboard. It was found that the plateaustress predicted by thedeveloped model compared well with the experimental results, from which one can conclude that the proposed model was effective and helpful for corrugated structures design and parameters selection to meet different strength requirements.
{"title":"MODELLING FOR SINGLE-WALL CORRUGATED FIBREBOARD WITH A TRAPEZOIDAL CORE UNDER THE QUASI-STATIC EDGEWISE CRUSHING LOAD","authors":"Guan Shili, Liang Youzhen, Wang Jun, Lu Lixin, Hou Xue","doi":"10.37763/wr.1336-4561/67.6.979993","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.979993","url":null,"abstract":"In this paper, the energy absorption of single-wall corrugated fibreboard with a trapezoidal core under edgewise crushing load was studied experimentally and analytically, and a physical surfacebonding was assumed to represent the interaction between the fluted board and thelinerboard based on the production process of corrugated fibreboards. Anew folding element was proposed, including two boards and two trapezoidal corrugated cores with central symmetry. Moreover, three folding modes of the fluted board were proposed based on experimental phenomena, and a plateau stress model was characterized by the geometry parameters of the corrugated fibreboard. It was found that the plateaustress predicted by thedeveloped model compared well with the experimental results, from which one can conclude that the proposed model was effective and helpful for corrugated structures design and parameters selection to meet different strength requirements.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123546263","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}
In this study, a modification combining densification and heat treatment of poplar wood (Populus tomentosa Carr.) was carried out, and the machining properties of theunmodified poplar wood (control) and the heat treated densified wood (HTD)were tested and evaluated. Inaddition, the water-based UV paint was covered on the control and HTD respectively, and thesurface coating properties of them were evaluated. The results showed that: (1)Themachining properties of poplar wood were improved after theheat treatment-densification modification. The score of comprehensive machining properties of the HTD was 45 (excellent grade), while the score of the control was 36 (good grade). (2)The abrasion resistance, hydrophobicity and adhesion were improved after heat treatment-densification modification. Therefore, the modification combining densification and heat treatment played asignificant role in enhancing thevalue of wood.
{"title":"STUDY ON MACHINING PROPERTIES AND SURFACE COATING PROPERTIES OF HEAT TREATED DENSIFIED POPLAR WOOD","authors":"Aokai Cheng, Dengyun Tu, Zhipeng Zhu, Qiaofang Zhou, Wei Wei, Chuanshuang Hu, Xianghao Liu","doi":"10.37763/wr.1336-4561/67.6.10321045","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.10321045","url":null,"abstract":"In this study, a modification combining densification and heat treatment of poplar wood (Populus tomentosa Carr.) was carried out, and the machining properties of theunmodified poplar wood (control) and the heat treated densified wood (HTD)were tested and evaluated. Inaddition, the water-based UV paint was covered on the control and HTD respectively, and thesurface coating properties of them were evaluated. The results showed that: (1)Themachining properties of poplar wood were improved after theheat treatment-densification modification. The score of comprehensive machining properties of the HTD was 45 (excellent grade), while the score of the control was 36 (good grade). (2)The abrasion resistance, hydrophobicity and adhesion were improved after heat treatment-densification modification. Therefore, the modification combining densification and heat treatment played asignificant role in enhancing thevalue of wood.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"314 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116358113","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 : 2022-12-13DOI: 10.37763/wr.1336-4561/67.6.953965
Š. Boháček, A. Pažitný, Michaela Handlovská
Thisresearch wasfocused on the effect of water content in the cells of disintegrated Populus nigraL. on a freeze-thaw pretreatment method before an enzymatic hydrolysis. Two chipped andsieved fractions 2.5 mm and0.7 mm and two milled fractions,characterized as 18°SR (Shopper–Riegler index) and 37°SR,of the disintegrated 5 years old poplartree were used for ourexperiment. Glucose and xylose yields were measured after 24 and 48 hours ofenzymatic hydrolysis with a 15% load of the enzyme measured to a total cellulose content. Theinfluence of nine freeze-thaw cycles under -20°C and +20°C was considered. The results showed thatanincrease in moisture content positively affects yields in all fractions but adesirable result was achieved mainly for the 0.7 mm fraction where the total yield increased by about 16%.More effective wayis afiner wetbeating ofwood mass, while wood fibrereceivesmoisture already in the technological process.Thehighest glucan conversion 51,74% and the total hemicelluloses conversion 47,72% was achieved for the finest fraction 37°SR.Thehigher moisture content has a positive effect on the increase in theconversion of oligosaccharides, especially glucan, in chipped fractions.
{"title":"INTENSIFICATION OF THE FREEZE-THAW PRETREATMENT OF DISINTEGRATED POPLAR WOOD","authors":"Š. Boháček, A. Pažitný, Michaela Handlovská","doi":"10.37763/wr.1336-4561/67.6.953965","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.953965","url":null,"abstract":"Thisresearch wasfocused on the effect of water content in the cells of disintegrated Populus nigraL. on a freeze-thaw pretreatment method before an enzymatic hydrolysis. Two chipped andsieved fractions 2.5 mm and0.7 mm and two milled fractions,characterized as 18°SR (Shopper–Riegler index) and 37°SR,of the disintegrated 5 years old poplartree were used for ourexperiment. Glucose and xylose yields were measured after 24 and 48 hours ofenzymatic hydrolysis with a 15% load of the enzyme measured to a total cellulose content. Theinfluence of nine freeze-thaw cycles under -20°C and +20°C was considered. The results showed thatanincrease in moisture content positively affects yields in all fractions but adesirable result was achieved mainly for the 0.7 mm fraction where the total yield increased by about 16%.More effective wayis afiner wetbeating ofwood mass, while wood fibrereceivesmoisture already in the technological process.Thehighest glucan conversion 51,74% and the total hemicelluloses conversion 47,72% was achieved for the finest fraction 37°SR.Thehigher moisture content has a positive effect on the increase in theconversion of oligosaccharides, especially glucan, in chipped fractions.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114607366","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 : 2022-12-13DOI: 10.37763/wr.1336-4561/67.6.10741080
Manish Ranjan, A. Nandanwar, Pradeep Kushwaha
Nine-ply plywood panels were produced from Eucalyptus grandisand Populus deltoidsusing urea-formaldehyde (UF) and phenol-formaldehyde (PF) adhesives. The physical and mechanical properties,such as moisture content, density, modulus of rupture (MOR) and modulus of elasticity (MOE) of the eucalyptus and poplar boards, were compared in this study. Samples were tested on both,along and across the grain. Higher values of MOR and MOEwere observed foreucalyptus as compare to poplar. Density of ply board was observed as 500-560kg.m-3in plywood from poplar and 700-720 kg.m-3in plywood from eucalyptus species. These differences were attributed to the variation in properties of veneer wood species. The effect of veneer wood species on some physical and mechanical properties of plywood was found statistically different.
{"title":"COMPARATIVE STUDY ON PHYSICAL-MECHANICAL PROPERTIES OF PLYWOOD PRODUCED FROM EUCALYPTUS GRANDIS AND POPULUS DELTOIDS VENEERS. SHORT NOTES","authors":"Manish Ranjan, A. Nandanwar, Pradeep Kushwaha","doi":"10.37763/wr.1336-4561/67.6.10741080","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.10741080","url":null,"abstract":"Nine-ply plywood panels were produced from Eucalyptus grandisand Populus deltoidsusing urea-formaldehyde (UF) and phenol-formaldehyde (PF) adhesives. The physical and mechanical properties,such as moisture content, density, modulus of rupture (MOR) and modulus of elasticity (MOE) of the eucalyptus and poplar boards, were compared in this study. Samples were tested on both,along and across the grain. Higher values of MOR and MOEwere observed foreucalyptus as compare to poplar. Density of ply board was observed as 500-560kg.m-3in plywood from poplar and 700-720 kg.m-3in plywood from eucalyptus species. These differences were attributed to the variation in properties of veneer wood species. The effect of veneer wood species on some physical and mechanical properties of plywood was found statistically different.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124219063","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 : 2022-12-13DOI: 10.37763/wr.1336-4561/67.6.9941004
Ondřej Dvořák, M. Pánek, Monika SARVAŠOVÁ KVIETKOVÁ, Filip Pastierovič, Irena Štěrbová, Kryštof Kubista, Lukáš Sahula
Coating systems are a popular way to protect wood against the effects of weathering when used outdoors. This study evaluates the impact of the basic wood species on the overall durability and color fastness of the selected water-based acrylic exterior paint. Spruce (Picea abies L.) and oak (Quercus roburL.) wood samples were subjected to external weathering according to EN 927-3 (2000) for 6 and 12 months. The evaluation by instrumental methods related to co changes in color, gloss, surface wettability contact angle, at which paint damage was also visually evaluated. The results showed that the durability of the tested coating was higher for spruce. Still, on the other hand, thanks to its lighter shade, a significant color change caused by the base wood's photodegradation was detected, showing that oak wood has a negative effect on the overall life of the tested coating.
{"title":"INFLUENCE OF WOOD SPECIES ON QUALITY OF EXTERIOR TRANSPARENT ACRYLIC COATING DURING OUTDOOR EXPOSURE","authors":"Ondřej Dvořák, M. Pánek, Monika SARVAŠOVÁ KVIETKOVÁ, Filip Pastierovič, Irena Štěrbová, Kryštof Kubista, Lukáš Sahula","doi":"10.37763/wr.1336-4561/67.6.9941004","DOIUrl":"https://doi.org/10.37763/wr.1336-4561/67.6.9941004","url":null,"abstract":"Coating systems are a popular way to protect wood against the effects of weathering when used outdoors. This study evaluates the impact of the basic wood species on the overall durability and color fastness of the selected water-based acrylic exterior paint. Spruce (Picea abies L.) and oak (Quercus roburL.) wood samples were subjected to external weathering according to EN 927-3 (2000) for 6 and 12 months. The evaluation by instrumental methods related to co changes in color, gloss, surface wettability contact angle, at which paint damage was also visually evaluated. The results showed that the durability of the tested coating was higher for spruce. Still, on the other hand, thanks to its lighter shade, a significant color change caused by the base wood's photodegradation was detected, showing that oak wood has a negative effect on the overall life of the tested coating.","PeriodicalId":358045,"journal":{"name":"WOOD RESEARCH 67(6) 2022","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132590935","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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