Rabadziski, Branko
Preferred name
Rabadziski, Branko
Official Name
Rabadziski, Branko
Main Affiliation
Email
rabadziski@fdtme.ukim.edu.mk
11 results
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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, Technical analysis of a metal chamber for direct steaming of beech lumber (Fagus sylvatica L.)(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2023-12); ; The aim of this paper is the technical analysis of a metal chamber for direct steaming of beech (Fagus sylvatica L.)-edged lumber with a thickness of 50.0 mm. The paper presents the basic parameters of the chamber and calculates the dimensions of the metal chamber and its capacity. The dimensions of the chamber with sawn lumber, the number of chambers, and the volume of the single lumber stack have been analyzed. The steaming of the wood is an important and complex operation during the processing of sawlogs into sawn lumber. Steaming, in addition to being a technological procedure, is also a thermal procedure. The steaming of the sawn lumber is carried out in the presence of water vapor in steaming chambers according to the following two methods: direct steaming of the sawn lumber and indirect steaming of the sawn lumber. In the method of direct steaming of lumber, the steaming medium is saturated water vapor. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Solar drying of wood(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2023-12); ; Solar energy represents an alternative source of energy supply, which has also found its application in wood processing technology. In particular, solar energy finds great application in the field of wood drying. Solar energy is defined as the emitted light and heat produced by the sun, which is harnessed with the help of developing technologies such as solar collectors, photovoltaic cells, solar and thermal collectors, various types of solar architecture, plantations and reactors that use molten salts, and technologies of artificial photosynthesis. The purpose of this paper is to give a brief overview of solar drying technology. A special review is given to solar drying methods. The method of work does not cause experimental research in practice but represents a collection of used literature and individual research. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Processing sawlogs into parquet blanks(FACULTY OF FOREST INDUSTRY – UNIVERSITY OF FORESTRY – SOFIA, 2024-12); ; ; ; The term parquet refers to a floor covering made of solid wood, consisting of interconnected slats in a horizontal plane. A parquet strip is the principal constructional element of the parquet. This wooden strip is obtained as a result of processing the flooring blank. In the sawmill processing of the sawlogs, the flooring blanks are sawn from the sawlogs, mostly in the radial and tangential direction. For such a purpose, sawlogs from domestic species and foreign species are used. Most dominant in this manner are the hardwood species, although softwood species can be used too. Among the domestic species, the most are beech, oak, acacia, elm, ash, and from the softwood species pine and larch. The paper focuses on the maximum quantitative yield of beech and oak sawlogs intended for processing into parquet blanks. The sawing was conducted on a bandsaw. The blanks were with a thickness of 25,0 mm. The sawlogs belonged to the I, II, and III quality classes. A total of 12 sawlogs were processed, 6 from beech (Fagus sylvatica L.) and 6 from oak (Quercus robur). All sawlogs were with a constant length of 3,0 m. The mean diameter for beech and oak sawlogs was in the range of 34,0 to 36,0 cm. The average value for the quantitative yield for beech sawlogs from I, II, and III quality classes was 37,90%. For the oak sawlogs from I, II, and III quality classes the average value of the quantitative yield was 39,40%. - 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, 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, 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, Yield comparison of beech (Fagus sylvatica L.) and fir/spruce (Abies alba Mill./Picea abies L.) logs in the sawmill processing industry(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2025-12); ; ; Sawmilling technology in Macedonia is primarily characterised by small- to medium-capacity sawmills, many of which operate with mixed species and variable equipment configurations. These sawmills typically process between 1500 and 5000 m³ of roundwood annually and play a crucial role in the domestic wood industry. The technology employed often includes vertical bandsaws for primary sawing and simple layouts for material flow. Beech (Fagus sylvatica L.) and fir/spruce (Abies alba Mill./Picea abies L.) are among the most commonly processed species, representing a significant share of the raw material input due to their abundance, accessibility, and economic relevance. Beech is predominantly used in furniture production, while fir/spruce is more common in construction and structural applications. This paper presents a focused comparative analysis of raw material yield efficiency between beech and fir/spruce logs in a primary processing setting. The study was conducted at the MARKISTO sawmill in Leskoec, Ohrid, a representative facility within the North Macedonian context, operating with a capacity of 2,500–3,000 m³ per year. A total of 160 logs from two standardised lengths (4.0 m and 5.0 m) and I, II, and III quality classes—80 from each species—were analysed. The objective was to quantify and compare the percentage yield of sawn timber relative to log volume, under real production conditions, without altering existing workflows. Key influencing factors such as log diameter, taper, and wood defects were recorded and assessed. Results indicated that fir/spruce logs generally achieved higher yield rates than beech, particularly in the higher quality classes. For instance, Class I fir/spruce logs yielded up to 10–15% more usable lumber compared to Class I beech logs, mainly due to more uniform structure and lower waste values. In contrast, beech logs, especially from lower quality classes, were more affected by natural defects like heart checks and curvature, reducing the quantitative yield despite similar or larger diameters. The study confirms that both species and log quality significantly affect sawmill efficiency and that careful log selection and classification are essential for optimising material recovery. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Influence of beech sawlogs (Fagus sylvatica L.) quality on milled lumber quality(Faculty of Design and Technologies of Furniture and Interior - Skopje, 2021-11); ; This research paper presents results obtained from conducted research under pragmatic conditions. The results correspond to the influence of the sawlogs quality on the milled lumber quality. The logs were from beechwood (Fagus sylvatica L.). The beech sawlogs, as the key point of research, were graded as 1st and 2nd grade logs. The sawlogs were with the consistent length of l = 4,0 m. The diameter of the 1st grade logs was in the range d = 33,0 ÷ 50 cm, and for the 2nd grade logs d = 34,0 ÷ 50,0 cm. The total number of analyzed logs was 40, 20 logs for each grade. The 1st grade sawlogs had the volume of V = 11,7 m3 and the volume for the 2nd grade logs was the same, V = 11,7 m3. The 1st grade sawlogs had a diameter taper in the range S = 0,5 ÷ 1,0 cm/m and the 2nd grade logs’ diameter taper was S = 0,75 ÷ 1,75 cm/m. The mean value of the diameter taper was as followed: for the 1st grade logs, Ssr = 0,78 cm/m and for the 2nd grade logs Ssr = 1,26 cm/m. It must be noted that the milled lumber values given in this research are relative. After milling the 1st grade logs, the following values were obtained: sawn lumber with a share of 62,80%, dimensional lumber with a share of 18,55%, and heartwood with a share of 18,65%; from a total amount of 100%. The 2nd grade logs gave the following values, from the total amount of 100%: 51,80% sawn lumber; 21,38% dimensional lumber, and 26,82% heartwood. The dimensional distribution of the milled lumber, for the 1st grade, from the total amount of 100%, was as following: 44,60% long milled lumber (l > 2,0 m); 20,84% short milled lumber (l = 1,0 ÷ 1,90 m); 15,91% extra short milled lumber (l = 0,5 ÷ 1,0 m) and 18,65% heartwood. The 2nd grade milled lumber had the following dimensional distribution: 38,20% long milled lumber (l > 2,0 m); 14,76% short milled lumber (l = 1,0 ÷ 1,90 m); 20,22% extra short milled lumber (l = 0,5 ÷ 1,0 m) and 26,82% heartwood, from the total amount of 100%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Evaluation of Processing Time in Primary Sawmilling of Scots Pine (Pinus sylvestris) Logs on a Vertical Band Saw(Department of Wood Technology, Faculty of Forestry and Wood Tehnology, University of Zagreb, Croatia, 2025); ; ; ; The efficiency of primary wood processing largely depends on the optimal utilization of macines and tools. Beyond the rational use of sawlogs in sawmilling, the profitability and effective operation of sawmill capacities critically rely on the efficient application of primary processing machines. These machines are primarily tasked with transforming logs into semi-finished products, through which logs are converted into sawn timber through the sawing process. Among the most implemented machines for primary processing are band saws. These types of primary machines allow individual log sawing, where each log is processed separately according to its dimensions and quality class. In such operations, determining the technological capacity is essential, defined as the volume of logs a machine can process within a given timeframe. A key factor affecting technological capacity is the processing time per log, which represents the cumulative duration of all sawing operations and factors involved in sawing , such as log rotation, number of cuts, log length and other related activities. The processing time can be divided into components dependent on the machine’s technological parameters and those influenced by the organization of production within the sawmill. This study presents a detailed analysis of processing times for Scots pine (Pinus sylvestris) sawlogs using a vertical band saw.