Drvna Industrija最新文献_第8页

Analyses of Shear Angle in Orthogonal Cutting of Pine Wood 松木正交切削剪切角的分析

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-07-15 DOI: 10.5552/drvind.2022.0022

K. Orłowski, D. Chuchala, G. Sinn

{"title":"Analyses of Shear Angle in Orthogonal Cutting of Pine Wood","authors":"K. Orłowski, D. Chuchala, G. Sinn","doi":"10.5552/drvind.2022.0022","DOIUrl":"https://doi.org/10.5552/drvind.2022.0022","url":null,"abstract":"The determination of energy effects for wood machining processes, such as cutting power and cutting forces, is very useful in designing of manufacture process of wooden products. A more accurate prediction of cutting forces requires a correct determination of the shear angle value, which can be determined using various models. In this article, shear angle values for an orthogonal linear cutting process of pine wood are determined. The pine wood analysed was represented by two groups of samples with different moisture content levels, 12 % and 20 %. Three different models were used to determine the shear angle values: the Merchant model, which is based on the rake angle and the angle of friction, model based on chip compression ratios and Atkins model based on material properties (elements of fracture mechanics). The values obtained have been analysed for comparison. Results showed that the values of the shearing angles determined from the chip compression ratios turned out to be higher than the values from Merchant equation. The shear angles determined from the Atkins model are, as expected, lower than those determined from the Merchant model. Furthermore, the shear angle values for moisture content of 20 % are higher than for moisture content of 12 %.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41951753","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

Initial Desorption of Reaction Beech Wood 反应山毛榉木材的初始解吸

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-07-15 DOI: 10.5552/drvind.2022.0021

J. Majka, M. Sydor, Jakub Prentki, M. Zborowska

{"title":"Initial Desorption of Reaction Beech Wood","authors":"J. Majka, M. Sydor, Jakub Prentki, M. Zborowska","doi":"10.5552/drvind.2022.0021","DOIUrl":"https://doi.org/10.5552/drvind.2022.0021","url":null,"abstract":"The research aimed to obtain empirical data for modeling the initial desorption in reaction wood from the cross-section of the green beech (Fagus sylvatica L.) log. Firstly, we analyzed the chemical composition, macro and microscopic structure of tension and opposite wood tissue. Then, the Equilibrium Moisture Content (EMC) was measured by the Dynamic Vapor Sorption method during the initial desorption. The used air parameters were specific for the mild drying schedule of green beech timber (t = 20, 35, and 50 °C, Relative Humidity (RH) ranging from 95 to 0 %). Relationships between the EMC of reaction wood and drying parameters were modeled using the Response Surface Method (RSM). The tests revealed: different hygroscopic properties of tension and opposite wood, the dependence of EMC value on temperature, and differences between EMC values for initial (first) and second desorption. Moreover, it was confirmed that, during initial desorption, the EMCs of reaction wood are significantly higher than reference EMC data. The differences in the EMC value are up to 0.14 kg/kg (for air with RH above 90 %). The presented polynomial model of the initial desorption of reaction beech wood can improve drying schedules for beech sawn timber with a high amount of reaction tissue.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45591905","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: 2

Quality and Dimensional Parameters of Large-Sized Pine Timber in View of Expectations of Polish Sawmill Industry 从波兰锯木厂的期望看大型松木的质量和尺寸参数

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-07-15 DOI: 10.5552/drvind.2022.0025

M. Wieruszewski, Z. Malinowski, R. Mirski

引用次数: 0

Colour Change of Steamed Alder Wood Caused by UV Radiation 紫外辐射对蒸Alder木材颜色的影响

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-07-15 DOI: 10.5552/drvind.2022.0019

L. Dzurenda, Michal Dudiak

{"title":"Colour Change of Steamed Alder Wood Caused by UV Radiation","authors":"L. Dzurenda, Michal Dudiak","doi":"10.5552/drvind.2022.0019","DOIUrl":"https://doi.org/10.5552/drvind.2022.0019","url":null,"abstract":"Alder wood (Alnus glutinosa L.) was steamed with a saturated steam-air mixture at a temperature of t = 95 °C, or saturated steam at t = 115 °C and t = 135 °C to obtain a pale brown colour, a light red-brown colour and a dark brown-grey colour. Subsequently, samples of unsteamed and steamed alder wood were irradiated with a UV lamp in a Xenotest Q-SUN Xe-3-HS after drying in order to test the colour stability of steamed alder wood. The colour change of the wood surface was evaluated by means of measured values on the coordinates of the colour space CIE L*a*b*. The results show that the surface of unsteamed alder wood as well as steamed alder wood with a steam-air mixture at t = 95 °C and saturated steam at t = 115 °C darkened and browned due to photochemical reactions caused by UV radiation. The opposite tendency was recorded at the surface of alder wood steamed with saturated steam with a temperature of t = 135 °C, where the deep dark-brown-grey colour lightened to a brown-reddish colour shade under the influence of UV radiation. The analysis of the changes in the coordinates of the colour space CIE L*a*b* shows that the greater the darkening and browning of the alder wood by steaming, the smaller the changes in the values of ΔL*, Δa*, Δb* of the steamed alder wood caused by UV radiation. The positive effect of steaming on UV resistance is evidenced by the decrease in the overall colour difference ΔE*. While the value of the total colour difference of unsteamed alder wood caused by UV radiation is ΔE* = 10.9, it decreased to ΔE* = 8.7 for alder wood steamed with steam-air mixture at t = 95 °C, which is a decrease of 20.2 %; for alder wood steamed at t = 115 °C it decreased to ΔE* = 6.5, which is a decrease of 40.3 %; and for alder wood steamed with saturated water steam with the temperature t = 135 °C it decreased to ΔE* = 5.7, which is a decrease of 47.7 %.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43066992","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

Influence of Moisture Content on Cutting Parameters and Fracture Characteristics of Spruce and Oak Wood 含水率对云杉和橡木切削参数及断裂特性的影响

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-07-15 DOI: 10.5552/drvind.2022.0026

Luďka Hanincová, J. Procházka, V. Novák, Z. Kopecký

{"title":"Influence of Moisture Content on Cutting Parameters and Fracture Characteristics of Spruce and Oak Wood","authors":"Luďka Hanincová, J. Procházka, V. Novák, Z. Kopecký","doi":"10.5552/drvind.2022.0026","DOIUrl":"https://doi.org/10.5552/drvind.2022.0026","url":null,"abstract":"The objective of this study was to determine the effect of the moisture content on cutting parameters and fracture characteristics of spruce and oak wood. Samples of Norway spruce (Picea abies (L.) H. Karst.) and English oak (Quercus robur L.) were dried to required moisture content and then used for the machinability test on circular sawblade machine. Results indicate that cutting force and feed force increase with increasing moisture content up to the fiber saturation point (FSP). When the moisture content increases above the FSP, the minimum values of cutting and feed force are achieved. Based on performed experiments, the fracture toughness and shear yield strength were derived. Fracture toughness decreases with increasing moisture content. The minimum values of fracture toughness are achieved at the moisture content level above the FSP. Shear yield strength decreases linearly with increasing moisture content: the decrease is up to 17 % compared to samples with moisture content at the FSP. Based on calculated results, the influence of moisture content and wood species on cutting and fracture characteristics was discussed.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46487446","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

Smart Office Chairs with Sensors for Detecting Sitting Positions and Sitting Habits 带有传感器的智能办公椅，可以检测坐姿和坐姿习惯

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-05-31 DOI: 10.5552/drvind.2022.0002

Z. Vlaović, Marko Jaković, D. Domljan

{"title":"Smart Office Chairs with Sensors for Detecting Sitting Positions and Sitting Habits","authors":"Z. Vlaović, Marko Jaković, D. Domljan","doi":"10.5552/drvind.2022.0002","DOIUrl":"https://doi.org/10.5552/drvind.2022.0002","url":null,"abstract":"The health consequences of prolonged sitting in the office and other work chairs have recently been tried to be alleviated or prevented by the application of modern technologies. Smart technologies and sensors are installed in different parts of office chairs, which enables monitoring of seating patterns and prevents positions that potentially endanger the health of users. The aim of this paper is to provide an overview of previous research in the field of the application of smart technologies and sensors built into office and other types of chairs in order to prevent diseases. The articles published in the period 2010-2020 and indexed in WoS CC, Scopus, and IEEE Xplore databases, with the keywords “smart chair” and “sensor chair” were analysed. 15 articles were processed, with their research being based on the use of different types of sensors that determine the contact pressures between the user’s body and stool parts and recognise different body positions when sitting, which can prevent negative health consequences. Analysed papers prove that the use of smart technology and a better understanding of sitting, using various sensors and applications that read body pressure and determine the current body position, can act as preventive health care by detecting proper heart rate and beats per minute, the activity of individual muscle groups, proper breathing and estimates of blood oxygen levels. In the future research, it is necessary to compare different types of sensors, methods used and the results obtained in order to determine which of them are most suitable for the future development of seating furniture for work.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47585787","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

Comparison of Soda, Kraft, and DES Pulp Properties of European Black Poplar 欧洲黑杨碱浆、硫酸盐浆和DES浆性能的比较

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-05-31 DOI: 10.5552/drvind.2022.2112

S. K. Gülsoy, Ülkü Burcu Gitti, A. Gençer

{"title":"Comparison of Soda, Kraft, and DES Pulp Properties of European Black Poplar","authors":"S. K. Gülsoy, Ülkü Burcu Gitti, A. Gençer","doi":"10.5552/drvind.2022.2112","DOIUrl":"https://doi.org/10.5552/drvind.2022.2112","url":null,"abstract":"Kraft pulping as the dominant pulping method contributes to several environmental problems. To overcome these problems, environmentally friendly pulping methods have been investigated. In the last years, deep eutectic solvents (DESs) have been identified as up-and-coming reagents in the lignocellulosic material processing and they are characterized as environmentally friendly. This study investigated the use of DES in pulp production from European black poplar chips. The DES mixture was prepared from choline chloride (ChCl) and ethylene glycol (EG). In addition, traditional soda and kraft pulping methods were carried out with poplar chips for comparison with the DES pulps. It was found that pulp production from poplar chips using DES was comparable to the soda and kraft pulps in terms of pulp yield, pulp viscosity, and opacity. The DES pulps easily reached target pulp freeness levels. However, the strength properties and brightness of the DES pulps were lower than those of the soda and kraft pulps. The strength properties of DES pulps can be improved with paper strength enhancers such as starch and micro or nanofibrillated cellulose. Also, the utilization of DES in pulp production may have an important role in cleaner production and it represents a greener alternative to traditional pulp production methods.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47405579","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

Chemical Changes and Environmental Issues of Heat Treatment of Wood 木材热处理的化学变化和环境问题

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-05-31 DOI: 10.5552/drvind.2022.0005

Nikolina Barlović, Anka Ozana Čavlović, S. Pervan, Miljenko Klarić, S. Prekrat, Nikola Španić

{"title":"Chemical Changes and Environmental Issues of Heat Treatment of Wood","authors":"Nikolina Barlović, Anka Ozana Čavlović, S. Pervan, Miljenko Klarić, S. Prekrat, Nikola Španić","doi":"10.5552/drvind.2022.0005","DOIUrl":"https://doi.org/10.5552/drvind.2022.0005","url":null,"abstract":"The paper gives an overview of chemical changes during heat treatment of wood and their influence on environment. Wood is one of the most used building materials because of its physical and technological properties. Various procedures improve its properties, and due to its environmental acceptability, heat treatment of wood is one of the most commonly used. Heat treatment causes changes in the cell walls and degradation of the main components of the wood structure (cellulose, hemicelluloses, lignin) and extractives. Hemicelluloses, as the most unstable components, are broken down first, followed by cellulose and finally lignin. Degradation results in a change in chemical composition and chemical reactions of colour change causing a technological problem because wood processing tends to make the colour as uniform as possible. The uniformity of colour and the desired colour tone are obtained by the process of steaming and thermal modification. The processing temperature is the most important factor that causes all the changes. Due to its wide use, need has arisen to investigate the ecological consequences of such a heat treatment process, as well as the impact of harmful substances and types of compounds released during the process and their toxicity.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45882741","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: 2

Tensile Performance of Traditional and Modern Corner Joints in Wooden Structures 传统与现代木结构角接缝的拉伸性能研究

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-03-19 DOI: 10.5552/drvind.2022.2106

M. Atar, Fazli Gode, Mustafa Kucuktuvek, Aslı Er Akan, H. Ormecioglu, H. Keskin

{"title":"Tensile Performance of Traditional and Modern Corner Joints in Wooden Structures","authors":"M. Atar, Fazli Gode, Mustafa Kucuktuvek, Aslı Er Akan, H. Ormecioglu, H. Keskin","doi":"10.5552/drvind.2022.2106","DOIUrl":"https://doi.org/10.5552/drvind.2022.2106","url":null,"abstract":"Corner joints are critical points of wooden structures not only in furniture construction but also in traditional wooden architecture, especially in constructions without nails. This study was performed to determine the effects of particular factors such as the axis of assembly, types of material, and adhesive on the tensile performance of various modern and traditional types of wooden corner joints. For this purpose, various corner joint specimens were prepared with three different wooden materials: Scots pine (Pinus sylvestris Lipsky) wood, Lombardy poplar (Populus nigra Lipsky) wood, and Medium Density Fibreboard (MDF) using two different adhesives: polyvinyl acetate (PVAc) and polyurethane (Desmodur-VTKA) glues; and five different wooden joint types: dowel, tongue-and-groove, half-blind dovetail, screw, and eccentric screw joints. Tensile performance tests, vertical and parallel to the axis of assembly, were carried out according to ASTM D 1037 guidelines. Experiments indicated that, while the tensile performance of MDF specimen connected with a screw and PVAc adhesive was the highest under loading parallel to the axis of assembly (4592 N); it was the lowest under loading parallel to the axis of assembly in MDF specimen connected with tongue-and-groove joint and PVAc adhesive (260 N), respectively. As a result, it may be advantageous to apply screwed joints in corners for high tensile strength in parallel to the axis of the assembly.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41694049","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

The Effect of Sheathing Material on Racking Performance of Plywood Shear Wall 护层材料对胶合板剪力墙承载性能的影响

IF 1.1 4区农林科学

Drvna Industrija Pub Date : 2022-03-19 DOI: 10.5552/drvind.2022.2039

Cenk Demirkir, Aydin Demir, H. Ozturk, I. Aydin

引用次数: 0