Faculty of Design and Technologies of Furniture and Interior
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Item type:Publication, Analysis of the influence of the length of beech sawlogs (Fagus sylvatica L.) on the maximum quantity exploitation(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2021-09); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Wood waste in the sawmill industry of wood processing(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2023-09); Sawmill processing produces a certain amount of waste, as a result of processing sawlogs into sawn lumber. Waste occurs in the form of fine and coarse waste. Fine and coarse waste are generated on the primary milling machine (band saw) and on the circular saws for transversal and longitudinal lumber cutting. In addition to fine and coarse waste, sawdust also occurs as waste, but due to its specificity, it is not quantified. This paper presents results obtained from several years of research, conducted in five sawmill capacities. The researched capacities were at the territory of the Republic of North Macedonia. The data was gathered under manufacturing conditions. The wood species covered in the paper are beech (Fagus sylvatica L.), pine (Pinus sylvesteris, Pinus nigra), oak (Quercus sessiliflora), aspen (Populus tremula L.) and fir/spruce (Abies alba/Picea excelsa). The results indicate that beech has the highest percentage of total waste, and fir/spruce has the lowest percentage of total waste. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Determination of the heat energy for hydrothermal treatment of ashwood (Fraxinus excelsior) by log soaking(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2023-09); The treatment of logs by soaking is a complex technological and thermal procedure, in which logs and prisms are used as raw material for the production of peeled and sliced veneers. Such treatment of logs is carried out in pools or pits constructed in the ground. By log soaking two significant changes to the wood are achieved, its coloring and the inevitable plastification of the wood fibers. During this procedure, the time required for air drying is significantly reduced. The soaking medium is fresh water or previously used water at an elevated temperature. This soaking treatment is particularly suitable for logs for the production of peeled and sliced veneer, from which resin must be removed. Soaking is also used when treating wood species that are sensitive to steaming. This paper provides an analysis of the thermal energy required for hydrothermal treatment by log soaking of ashwood (Fraxinus excelsior). The logs were intended for the production of peeled veneer. The log treatment was done in a reinforced concrete pool built in the ground. The total amount of heat for log soaking (Q) consists of effective heat (Qpv) and heat loss (Qzv). The procedure was conducted by the strong treatment mode, with a temperature interval in the range of 70 to 90 °C. The treated logs had a minimum mean diameter of 35,0 cm and a minimum length of 1,8 m. Log soaking was used as a method for defrosting of the logs, due to their low initial temperature, which was– 15 °C. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of heat and steam consumption during artificial convective drying of oak sawn timber of different thickness(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2023-09); ; ; ; In the paper, the consumption of heat and steam of oak sawn timber with a thickness of 25,0 and 50,0 (mm) are analyzed under conditions of classic convective drying. The drying mode is compiled on the basis of data on the temperature of the drying agent (air), the relative humidity of the air and the speed of air movement in accordance with the current value of moisture in the wood. The heat consumption is analyzed in all stages of the drying cycle such as heating the wood, active drying of the wood, equalization of the average moisture in the wood and conditioning, i.e. equalization of the moisture in the cross-section within ± 2.0 (%). The moisture content of sawn timber at the beginning of drying is about 55,0 (%) and at the end of drying is 10,0 (%). The sawn timber are intended for the production of solid wood panels. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison of log taper in different wood species(Department of Wood Technology, Faculty of Forestry and Wood Technology, University of Zagreb, Croatia, 2023-12); ; The rational yield of the sawlogs is one of the key factor for the prosperity of the sawmill capacity. One of the factors that significantly influence the maximum quantitative yield of sawlogs is the diameter taper. The diameter taper is an inevitable sawlogs occurrence and it is determined by the geometry of the logs. The diameter taper is defined as the difference between the diameters of the two ends of the log, alongside its length. Great differences between these two diameters adversely affect the percentage of maximum quantitative yield. This parametar plays a fundamental role in the classification of logs into quality classes. The aim of the paper is to compare the diameter taper in different wood species. Wood species of interest are: beech (Fagus sylvatica L.), pine (Pinus sylvestris, Pinus nigra), oak (Quercus sessiliflora), and fir/spruce (Abies alba/Picea excelsa). Log length is of important influence in the value of log taper. Therefore, the analysis for the different wood species will also present different groups of lengths, in order to determine the different values for the log taper. The selection of wood species is for the purpose of comparison of the taper values in deciduous and coniferous wood species. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Analysis of heat consumption during convective wood drying of beech sawn timber of different thickness(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2025-09); ; In the paper, the heat consumption of beech sawn timber with a thickness of 50,0 and 70,0 (mm) are analyzed under conditions of classic convective drying. The drying mode is compiled on the basis of data on the temperature of the drying agent (air), the relative humidity of the air and the speed of air movement in accordance with the current value of moisture in the wood. The heat consumption is analyzed in all stages of the drying cycle such as heating the wood, active drying of the wood and conditioning, i.e. equalization of the moisture in the cross-section within ± 2.0 (%). The moisture content of sawn timber at the beginning of drying is about 45,0 (%) and at the end of drying is 8,0 (%). - Some of the metrics are blocked by yourconsent settings
Item type:Publication, The state of export and import of wood products and furniture in the Republic of North Macedonia: Trends and strategies for growth(WoodEMA, i.a. – International Association for Economics and Management in Wood Processing and Furniture Manufacturing, 2025-09); ; - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Adhesion of varnished beech wood surfaces(University of Zagreb (Croatia), Faculty of forestry, Research institute for wood technology, UFI-Paris (France), Zagreb Fair, 2004-10-15) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, IMPACT OF FEED RATE ON ENERGY CONSUMPTION DURING CUTTING DRY BEECH WOOD WITH A CIRCULAR SAW(Faculty of forestry and wood technology, University of Zagreb, Croatia, 2023-12); The feed rate during mechanical processing of wood is one of the factors that has a high impact on energy consumption. Energy consumption is an indicator of cutting resistance and depends directly proportionally, that is, inversely proportionally when the thickness of the sawdust is less than 0,1mm. At the same time, the teeth do not cut the wood, i.e. they do not create sawdust but wood dust. The friction of the teeth on the wood is increased, the temperature in the contact zone increases and the teeth blunted quickly. For this purpose, this paper investigates the dependence of the feed rate on the energy consumption of beech wood, when cutting dry wood with a circular saw, with the intention of determining the optimal cutting conditions for obtaining optimal values of energy consumption. In this research, three different feed rates were applied (U1=12mmin-1, U2=16mmin-1 and U3=20mmin-1) for a constant cutting height of 45mm in dry beech wood with humidity of W=10±1%. The measurements were made with a circular saw with a diameter of D=250mm, number of teeths Z=80 and width of the cut b=3,2mm. The number of revolutions is n=5500 min-1. Measurement data for energy consumption were taken with a clamp ampermeter. The obtained results show a pronounced significance, i.e. directly proportional dependence of the energy consumption on the feed rate - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Al-based optimization of surface roughness in wood band sawing using polynomial regression and differential evolution(AAB College, Pristina, Kosovo, 2025-05); Jevtoska, ElenaThis study presents an artificial intelligence–assisted optimization framework for minimizing surface roughness (Rₘₐₓ) in wood band sawing. A third-order Polynomial Regression Model (PRM-3) was developed and trained on experimentally collected data obtained under varied cutting conditions, including angle, height, and feed rate. To ensure robust generalization, configurations with a 60° cutting angle were deliberately excluded from training and used solely for out-of-sample validation. PRM-3 was integrated with the Differential Evolution (DE) algorithm to identify optimal process configurations. For comparative purposes, a Gaussian Process Regression (GPR) model was also implemented to evaluate the relative generalization capability. Results confirmed the superior performance of PRM-3 in terms of accuracy, stability, and generalization, compared to GPR, demonstrating high potential for deployment in intelligent wood machining applications. The proposed framework represents a valuable integration of interpretable modeling and automated optimization for surface quality control in industrial settings