Pub Date : 2023-09-29DOI: 10.5552/drvind.2023.0091
Marie Rusinová, Miloš Lavický, Miloš Kalousek, Martin Sedlmajer
Fire resistance of load-bearing wooden structures is evaluated by the charring of surface layers of wooden bearing elements. The degree of resistance is determined by the onset and course of charring; these basic parameters are affected by the cover structure as well as by cavity fillers between the individual bearing elements. This article focuses on analysing the structure of fire protection covers based on gypsum boards, namely gypsum plasterboards and gypsum fibreboards. The foundation for the current analysis, based on the ignition temperature of the load-bearing timber element under the fire cover, includes the results of experimental fire tests carried out on test specimens in a fire furnace with a standard time-temperature curve set to simulate a fire. In addition, a numerical analysis of the temperature behaviour in the structure was carried out in order to compare the experimental results with the values obtained by mathematical analysis. Finally, the influence of the cover layers on the resulting fire resistance of the analysed structures is evaluated.
{"title":"Analiza utjecaja protupožarne obloge na bazi gipsa na pougljenje drvenih nosivih elemenata","authors":"Marie Rusinová, Miloš Lavický, Miloš Kalousek, Martin Sedlmajer","doi":"10.5552/drvind.2023.0091","DOIUrl":"https://doi.org/10.5552/drvind.2023.0091","url":null,"abstract":"Fire resistance of load-bearing wooden structures is evaluated by the charring of surface layers of wooden bearing elements. The degree of resistance is determined by the onset and course of charring; these basic parameters are affected by the cover structure as well as by cavity fillers between the individual bearing elements. This article focuses on analysing the structure of fire protection covers based on gypsum boards, namely gypsum plasterboards and gypsum fibreboards. The foundation for the current analysis, based on the ignition temperature of the load-bearing timber element under the fire cover, includes the results of experimental fire tests carried out on test specimens in a fire furnace with a standard time-temperature curve set to simulate a fire. In addition, a numerical analysis of the temperature behaviour in the structure was carried out in order to compare the experimental results with the values obtained by mathematical analysis. Finally, the influence of the cover layers on the resulting fire resistance of the analysed structures is evaluated.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135295507","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}
Pub Date : 2023-09-29DOI: 10.5552/drvind.2023.0028
Meltem Cengiz, Ahmet Gençer, Tülin Gürkan Polat, Abdullah Sütçü
This study aimed to improve the quality properties of impregnated papers used as a coating material in wood-based composites, especially for high-density fiberboard (HDF) floorings, using the Taguchi method and parameter design. Three factors were evaluated in determining the interactions as they are considered the most important in affecting the product quality characteristics such as particle size of Al2O3, surface modification agent and melamine raw material. Experiments were conducted in three replications using the L18 (21 × 32) orthogonal array. Color and gloss measurements were evaluated together with the sensory analysis method, which takes into account the number of the spots in the sample as quality characteristics. The best values obtained as a result of statistical analysis were A2 for the melamine raw material, 30 to 60 μm for the particle size and N-methyl-3-(trimethoxysilyl) propylamine for the surface modifier agent. Whether the experimental factors have a meaningful effect on the quality characteristics was also tested separately by analysis of variance. Only 58 % of the effect of the evaluated factors on the outcome could be expressed with the linear model (R2adj = 0.5785).
{"title":"Improving Surface Quality of Resin Impregnated Paper Used for Laminated Flooring Overlaid","authors":"Meltem Cengiz, Ahmet Gençer, Tülin Gürkan Polat, Abdullah Sütçü","doi":"10.5552/drvind.2023.0028","DOIUrl":"https://doi.org/10.5552/drvind.2023.0028","url":null,"abstract":"This study aimed to improve the quality properties of impregnated papers used as a coating material in wood-based composites, especially for high-density fiberboard (HDF) floorings, using the Taguchi method and parameter design. Three factors were evaluated in determining the interactions as they are considered the most important in affecting the product quality characteristics such as particle size of Al2O3, surface modification agent and melamine raw material. Experiments were conducted in three replications using the L18 (21 × 32) orthogonal array. Color and gloss measurements were evaluated together with the sensory analysis method, which takes into account the number of the spots in the sample as quality characteristics. The best values obtained as a result of statistical analysis were A2 for the melamine raw material, 30 to 60 μm for the particle size and N-methyl-3-(trimethoxysilyl) propylamine for the surface modifier agent. Whether the experimental factors have a meaningful effect on the quality characteristics was also tested separately by analysis of variance. Only 58 % of the effect of the evaluated factors on the outcome could be expressed with the linear model (R2adj = 0.5785).","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135296209","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0057
Henry Eric Magezi, T. Okan
The study aimed to understand the determining factors of the trade between Turkey and the European Union (EU) countries in the forest products sector and assess Turkey’s forest product export potential to the EU. The study period was from 2005 to 2020 and focused on HS44, HS47, and HS48 forest product groups. A gravity model was estimated using panel data with the Ordinary Least Squares, Random Effects, and Hausman-Taylor estimation methods. Results indicate that the forest products exports from Turkey to the EU are significantly influenced by the Gross Domestic Product, the population of Turkey and the EU partner, and negatively by the relative forest endowment. The elasticities estimated were then used to predict the export potential of Turkey in the trade of forest products. The findings revealed that the predicted forest export value exceeded Turkey’s actual forest products export to Denmark, France, Italy, Luxembourg, Poland, Slovenia and Spain from 2005 to 2020.
{"title":"A Gravity Model Analysis of Forest Products Trade Between Turkey and European Union Countries","authors":"Henry Eric Magezi, T. Okan","doi":"10.5552/drvind.2023.0057","DOIUrl":"https://doi.org/10.5552/drvind.2023.0057","url":null,"abstract":"The study aimed to understand the determining factors of the trade between Turkey and the European Union (EU) countries in the forest products sector and assess Turkey’s forest product export potential to the EU. The study period was from 2005 to 2020 and focused on HS44, HS47, and HS48 forest product groups. A gravity model was estimated using panel data with the Ordinary Least Squares, Random Effects, and Hausman-Taylor estimation methods. Results indicate that the forest products exports from Turkey to the EU are significantly influenced by the Gross Domestic Product, the population of Turkey and the EU partner, and negatively by the relative forest endowment. The elasticities estimated were then used to predict the export potential of Turkey in the trade of forest products. The findings revealed that the predicted forest export value exceeded Turkey’s actual forest products export to Denmark, France, Italy, Luxembourg, Poland, Slovenia and Spain from 2005 to 2020.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49075228","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0003
Umit Ergin, Sait Dundar Sofuoglu
The main objective of this study is to determine the effect of heat treatment on the machiningproperties of solid wood material and determine the optimum cutting parameters to obtain surfaces with minimum surface roughness. In line with this goal, Siberian pine (Pinus sibirica) wood species, widely used in the woodworking and furniture industry, was chosen as the experimental material. The heat-treated (at a temperature of 190 °C for 2 hours) and untreated samples were machined using two different cutters (carbide upcut milling cutter and carbide compression milling cutter) with 5 mm diameter at 1000, 1500 and 2000 mm/min feeds, 8000, 12000, 16000 rpm spindle speed, 50, 75 and 100 % stepover on the CNC machine. Surface roughness values (Ra and Rz) were measured to evaluate the obtained surfaces according to ISO 468 (2009), ISO 3274 (2005), and ISO 4287 (1997) using a contact profilometer. When the data was evaluated in general, the lowest roughness value for Ra occurred in upcut milling cutter, with 50% stepover, 12000 rpm, 1000 mm/min feed on untreated solid wood material. The highest roughness value for Ra occurred in a compression milling cutter, with 100 % stepover, 16000 rpm, 2000 mm/min feed on heat-treated solid wood material. It has been observed that the feed is the most critical parameter affecting the surface roughness.
{"title":"Određivanje svojstava obradivosti toplinski modificiranog drva sibirskog bora (Pinus sibirica)","authors":"Umit Ergin, Sait Dundar Sofuoglu","doi":"10.5552/drvind.2023.0003","DOIUrl":"https://doi.org/10.5552/drvind.2023.0003","url":null,"abstract":"The main objective of this study is to determine the effect of heat treatment on the machiningproperties of solid wood material and determine the optimum cutting parameters to obtain surfaces with minimum surface roughness. In line with this goal, Siberian pine (Pinus sibirica) wood species, widely used in the woodworking and furniture industry, was chosen as the experimental material. The heat-treated (at a temperature of 190 °C for 2 hours) and untreated samples were machined using two different cutters (carbide upcut milling cutter and carbide compression milling cutter) with 5 mm diameter at 1000, 1500 and 2000 mm/min feeds, 8000, 12000, 16000 rpm spindle speed, 50, 75 and 100 % stepover on the CNC machine. Surface roughness values (Ra and Rz) were measured to evaluate the obtained surfaces according to ISO 468 (2009), ISO 3274 (2005), and ISO 4287 (1997) using a contact profilometer. When the data was evaluated in general, the lowest roughness value for Ra occurred in upcut milling cutter, with 50% stepover, 12000 rpm, 1000 mm/min feed on untreated solid wood material. The highest roughness value for Ra occurred in a compression milling cutter, with 100 % stepover, 16000 rpm, 2000 mm/min feed on heat-treated solid wood material. It has been observed that the feed is the most critical parameter affecting the surface roughness.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44262711","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0046
Nadir Ersen, Ugur Can Usta, Bahadır Çağrı Bayram, I. Akyüz
The purpose of this study is to investigate the mediating role of presenteeism in the relationship between organizational stress and organizational silence of 305 forest products employees in İstanbul and Kocaeli, Turkey. According to our literature review, although some important studies about presenteeism, stress, and silence can be found, this study is the first to explore the mediating role of presenteeism in the relationship between organizational stress and organizational silence in forest products sector. The research was designed as a field study and conducted using a questionnaire. The questionnaire involved forest industry employees’ demographic data, Organizational Stress Scale, Organizational Silence Scale, and Stanford Presenteeism Scale. Data were analyzed in SPSS and AMOS, incorporating statistical tests such as exploratory and confirmatory factor analysis, correlation analysis, and structural equation modeling. Results of the analyzed data showed that presenteeism had a significant moderating effect on the relationship between organizational stress and organizational silence. Moreover, organizational stress had a positive effect on presenteeism, while organizational silence had a negative effect. Organizational stress had no effect on organizational silence. Therefore, managers should develop strategies for coping with stress to reduce presenteeism behavior of their employees and identify organizational stress factors causing organizational silence.
{"title":"Intermediate Role of Presenteeism in Relationship Between Organizational Stress and Organizational Silence","authors":"Nadir Ersen, Ugur Can Usta, Bahadır Çağrı Bayram, I. Akyüz","doi":"10.5552/drvind.2023.0046","DOIUrl":"https://doi.org/10.5552/drvind.2023.0046","url":null,"abstract":"The purpose of this study is to investigate the mediating role of presenteeism in the relationship between organizational stress and organizational silence of 305 forest products employees in İstanbul and Kocaeli, Turkey. According to our literature review, although some important studies about presenteeism, stress, and silence can be found, this study is the first to explore the mediating role of presenteeism in the relationship between organizational stress and organizational silence in forest products sector. The research was designed as a field study and conducted using a questionnaire. The questionnaire involved forest industry employees’ demographic data, Organizational Stress Scale, Organizational Silence Scale, and Stanford Presenteeism Scale. Data were analyzed in SPSS and AMOS, incorporating statistical tests such as exploratory and confirmatory factor analysis, correlation analysis, and structural equation modeling. Results of the analyzed data showed that presenteeism had a significant moderating effect on the relationship between organizational stress and organizational silence. Moreover, organizational stress had a positive effect on presenteeism, while organizational silence had a negative effect. Organizational stress had no effect on organizational silence. Therefore, managers should develop strategies for coping with stress to reduce presenteeism behavior of their employees and identify organizational stress factors causing organizational silence.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47062143","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0029
Ibrahim Karaman, Kenan Kiliç, Cevdet Sögütlü
The purpose of this study was to predict the adhesion strength of the varnish, which is applied as a protective coating/finish on the surface of wooden material using soft computing models. In this study, the soft computing approaches were applied to oak (Quercus Petrea L.), chestnut (Castanea sativa M.), and scotch pine (Pinus sylvestris L.) with water-based, polyurethane, and acrylic varnishes. The adhesion strength of the varnish was determined in accordance with the Turkish Standard Institute-24624 and ASTM D4541. The outcome of the experiment was used to develop artificial neural network (ANN) and fuzzy logic (FL) prediction models. The total number of 360 data points was split as 80 % of training and 20 % of test for the model development. During the application of the ANN, 6 features were used as an input, while the adhesion strength was used as an output of the model. The coefficient of determination values (R2) for training and testing in the ANN models were 0.9939 and 0.9580, respectively. In the case of the ANFIS model, R2 values for training and testing were 0.9917 and 0.9929, respectively. Considering the MAPE, RMSE, and R2 values obtained from the results of both training and test values, it can be concluded that the ANFIS model showed a more successful performance in estimating varnish adhesion strength. Therefore, ANN and ANFIS have the potential to provide time and cost-efficient benefits in estimating wood adhesion strength.
{"title":"Predviđanje adhezivne čvrstoće nekih lakova uz pomoć modela mekog računalstva","authors":"Ibrahim Karaman, Kenan Kiliç, Cevdet Sögütlü","doi":"10.5552/drvind.2023.0029","DOIUrl":"https://doi.org/10.5552/drvind.2023.0029","url":null,"abstract":"The purpose of this study was to predict the adhesion strength of the varnish, which is applied as a protective coating/finish on the surface of wooden material using soft computing models. In this study, the soft computing approaches were applied to oak (Quercus Petrea L.), chestnut (Castanea sativa M.), and scotch pine (Pinus sylvestris L.) with water-based, polyurethane, and acrylic varnishes. The adhesion strength of the varnish was determined in accordance with the Turkish Standard Institute-24624 and ASTM D4541. The outcome of the experiment was used to develop artificial neural network (ANN) and fuzzy logic (FL) prediction models. The total number of 360 data points was split as 80 % of training and 20 % of test for the model development. During the application of the ANN, 6 features were used as an input, while the adhesion strength was used as an output of the model. The coefficient of determination values (R2) for training and testing in the ANN models were 0.9939 and 0.9580, respectively. In the case of the ANFIS model, R2 values for training and testing were 0.9917 and 0.9929, respectively. Considering the MAPE, RMSE, and R2 values obtained from the results of both training and test values, it can be concluded that the ANFIS model showed a more successful performance in estimating varnish adhesion strength. Therefore, ANN and ANFIS have the potential to provide time and cost-efficient benefits in estimating wood adhesion strength.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46493111","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0055
Cebrail Açιk
Recently, efforts have been made to develop decoration techniques with CNC router machining and contact production machines in the furniture industry. However, this method is insufficient in micro-processes that require precision. In this research, the innovation of traditional furniture surface treatment techniques as a regression modeling production method with laser technology was examined. For this purpose, beech wood was processed in a CNC laser processing machine with a 130-watt carbon dioxide gas tube, and sample product design and manufacture were made. It has been determined that many furniture surface treatment techniques can be applied with the regression modeling method of CAD/CAM supported laser technology.
{"title":"Innovation of Traditional Furniture Surface Decoration Techniques with CNC Laser-Assisted Regression Modeling Production Method","authors":"Cebrail Açιk","doi":"10.5552/drvind.2023.0055","DOIUrl":"https://doi.org/10.5552/drvind.2023.0055","url":null,"abstract":"Recently, efforts have been made to develop decoration techniques with CNC router machining and contact production machines in the furniture industry. However, this method is insufficient in micro-processes that require precision. In this research, the innovation of traditional furniture surface treatment techniques as a regression modeling production method with laser technology was examined. For this purpose, beech wood was processed in a CNC laser processing machine with a 130-watt carbon dioxide gas tube, and sample product design and manufacture were made. It has been determined that many furniture surface treatment techniques can be applied with the regression modeling method of CAD/CAM supported laser technology.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49652085","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0067
Lukas Emmerich, Christian Brischke
The majority of mechanical wood properties are negatively affected by wood moisture within the hygroscopic range, disregarding the stress relaxation of wood at very low moisture contents (MC). In contrast, the structural integrity and thus the brittleness of wood appears to be positively affected by moisture. This study aimed at examining the effect of wood MC on the structural integrity of wood between the oven-dry state and MC well above cell wall saturation (CWS), i.e., at approx. 100 %. For both softwood (Picea abies) and hardwoods (Fagus sylvatica and Quercus robur), the structural integrity was assessed on the basis of the Resistance to Impact Milling (RIM) originating from High-Energy Multiple Impact (HEMI) tests. RIM increased with increasing MC in the hygroscopic range, which might be explained by stress relaxation and ‘gluing effects’ inside the cell wall polymer structure, resulting from a growing network of hydrogen bonds on cell wall level. Increasing MC above CWS caused a slight decrease of RIM in the selected hardwood species, whereas no significant change in RIM was observed when MC varied in the range from CWS to approx. 100 % for the softwood species Norway spruce.
{"title":"Utjecaj sadržaja vode u drvu na strukturnu cjelovitost drva pri dinamičkim opterećenjima","authors":"Lukas Emmerich, Christian Brischke","doi":"10.5552/drvind.2023.0067","DOIUrl":"https://doi.org/10.5552/drvind.2023.0067","url":null,"abstract":"The majority of mechanical wood properties are negatively affected by wood moisture within the hygroscopic range, disregarding the stress relaxation of wood at very low moisture contents (MC). In contrast, the structural integrity and thus the brittleness of wood appears to be positively affected by moisture. This study aimed at examining the effect of wood MC on the structural integrity of wood between the oven-dry state and MC well above cell wall saturation (CWS), i.e., at approx. 100 %. For both softwood (Picea abies) and hardwoods (Fagus sylvatica and Quercus robur), the structural integrity was assessed on the basis of the Resistance to Impact Milling (RIM) originating from High-Energy Multiple Impact (HEMI) tests. RIM increased with increasing MC in the hygroscopic range, which might be explained by stress relaxation and ‘gluing effects’ inside the cell wall polymer structure, resulting from a growing network of hydrogen bonds on cell wall level. Increasing MC above CWS caused a slight decrease of RIM in the selected hardwood species, whereas no significant change in RIM was observed when MC varied in the range from CWS to approx. 100 % for the softwood species Norway spruce.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46662301","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0033
Hilal Singer, Şükrü Özşahin
The evaluation of wooden toys is a complicated process and can be overwhelming for decisionmakers in the presence of many conflicting criteria. Hence, this study proposes a fuzzy decision-making model to identify and prioritize the key attributes of wooden toys. For this purpose, the interval-valued spherical fuzzy analytic hierarchy process (AHP), which is one of the fuzzy multicriteria decision-making methods, is applied to obtain weight vectors. Firstly, the wooden toy evaluation problem is formulated as a multicriteria decision-making problem. Then five main criteria and twenty subcriteria are defined with the help of experts. The decision-making team carries out the pairwise comparisons of the criteria. As a result, the priority weights are computed and the ranking order of the criteria is revealed. Additionally, the validity of the obtained results is supported by conducting a comparative analysis between other popular fuzzy methods: interval type-2 fuzzy AHP, interval-valued Pythagorean fuzzy AHP, and spherical fuzzy AHP. According to the modeling results, the most important criteria are “absence of small parts and sharp edges”, “free of harmful wood preservatives and paints”, “workmanship quality”, “contribution to psychomotor development”, and “contribution to cognitive development”. The proposed framework can be adapted to similar decision processes for the evaluation or improvement of toys. Consequently, the findings of this research will help manufacturers, designers, and consumers in making conscious decisions.
{"title":"Analysis of Key Attributes of Wooden Toys via an Interval-Valued Spherical Fuzzy Analytic Hierarchy Process","authors":"Hilal Singer, Şükrü Özşahin","doi":"10.5552/drvind.2023.0033","DOIUrl":"https://doi.org/10.5552/drvind.2023.0033","url":null,"abstract":"The evaluation of wooden toys is a complicated process and can be overwhelming for decisionmakers in the presence of many conflicting criteria. Hence, this study proposes a fuzzy decision-making model to identify and prioritize the key attributes of wooden toys. For this purpose, the interval-valued spherical fuzzy analytic hierarchy process (AHP), which is one of the fuzzy multicriteria decision-making methods, is applied to obtain weight vectors. Firstly, the wooden toy evaluation problem is formulated as a multicriteria decision-making problem. Then five main criteria and twenty subcriteria are defined with the help of experts. The decision-making team carries out the pairwise comparisons of the criteria. As a result, the priority weights are computed and the ranking order of the criteria is revealed. Additionally, the validity of the obtained results is supported by conducting a comparative analysis between other popular fuzzy methods: interval type-2 fuzzy AHP, interval-valued Pythagorean fuzzy AHP, and spherical fuzzy AHP. According to the modeling results, the most important criteria are “absence of small parts and sharp edges”, “free of harmful wood preservatives and paints”, “workmanship quality”, “contribution to psychomotor development”, and “contribution to cognitive development”. The proposed framework can be adapted to similar decision processes for the evaluation or improvement of toys. Consequently, the findings of this research will help manufacturers, designers, and consumers in making conscious decisions.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47269071","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}
Pub Date : 2023-06-20DOI: 10.5552/drvind.2023.0054
Ç. Altay
This study aimed to improve some surface properties such as color, gloss, and surface roughness changes of Oriental beech (Fagus orientalis L.) wood impregnated with some water repellent chemicals such as glycerol (GR) and glyoxal (GX) after weathering. Oriental beech wood specimens were impregnated with a 4 % aqueous solution of GR, GX, and a mixture of GR and GX (1:1; weight : weight) (GR+GX) and then exposed to weathering in Muğla Province in Turkey. Results showed that [delta]L* values of all wood specimens were decreased after weathering. Moreover, the decreases in the control specimen were higher than in the impregnated wood specimens. Oriental beech wood specimens showed a greenish and yellowish tendency, giving -[delta]a* and +[delta]b* values, respectively. Total color changes of GR impregnated Oriental beech was the lowest after weathering. The gloss of all Oriental beech test specimens decreased after weathering. The control specimen gave the lowest value in all three surface roughness parameters (Ra, Rz, and Rq) after weathering. Among the impregnated specimens, the groups impregnated with GR had, in general, the highest value in all three roughness degrees and showed the most negative results in surface roughness.
{"title":"Weathering Performance of Oriental Beech (Fagus orientalis L.) Wood Impregnated with Glycerol and Glyoxal","authors":"Ç. Altay","doi":"10.5552/drvind.2023.0054","DOIUrl":"https://doi.org/10.5552/drvind.2023.0054","url":null,"abstract":"This study aimed to improve some surface properties such as color, gloss, and surface roughness changes of Oriental beech (Fagus orientalis L.) wood impregnated with some water repellent chemicals such as glycerol (GR) and glyoxal (GX) after weathering. Oriental beech wood specimens were impregnated with a 4 % aqueous solution of GR, GX, and a mixture of GR and GX (1:1; weight : weight) (GR+GX) and then exposed to weathering in Muğla Province in Turkey. Results showed that [delta]L* values of all wood specimens were decreased after weathering. Moreover, the decreases in the control specimen were higher than in the impregnated wood specimens. Oriental beech wood specimens showed a greenish and yellowish tendency, giving -[delta]a* and +[delta]b* values, respectively. Total color changes of GR impregnated Oriental beech was the lowest after weathering. The gloss of all Oriental beech test specimens decreased after weathering. The control specimen gave the lowest value in all three surface roughness parameters (Ra, Rz, and Rq) after weathering. Among the impregnated specimens, the groups impregnated with GR had, in general, the highest value in all three roughness degrees and showed the most negative results in surface roughness.","PeriodicalId":11427,"journal":{"name":"Drvna Industrija","volume":" ","pages":""},"PeriodicalIF":1.1,"publicationDate":"2023-06-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42232397","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：