Jurnal Ilmu dan Teknologi Hasil Hutan
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Forest products industry in Indonesia is now facing major issues such as a huge log deficit, a low industrial efficiency, and a declined in forest products competitiveness. Production cost and optimization analysis are then conducted to provide insight for the firms so they can operate efficiently and have high products competitiveness. The results show that a production cost varies from US 247.68 per m3 with an average of US$ 214.50 per m3 and a firm’s profit would increase by 18% even though production decreased by 1.5% when the firm operates at optimum level. Keywords : Plywood industry, optimization, production cost analysis, competitiveness
No full textForest products industry in Indonesia is now facing major issues such as a huge log deficit, a low industrial efficiency, and a declined in forest products competitiveness. Production cost and optimization analysis are then conducted to provide insight for the firms so they can operate efficiently and have high products competitiveness. The results show that a production cost varies from US 247.68 per m3 with an average of US$ 214.50 per m3 and a firm’s profit would increase by 18% even though production decreased by 1.5% when the firm operates at optimum level. Keywords : Plywood industry, optimization, production cost analysis, competitivenes
Wood has specific base properties of thermal and combustion. Since being grew normally at marginal soil of mining area, sengon buto, waru and gmelina woods were objectified to investigate thermophisic aspect of their usage as substitution fuel in cement production. Examination based on species, ages and horizontal positions of those woods showed that mean of heating value in oven dry and air dry condition was 4.505 kkal/kg and 4.084 kkal/kg, respectively. Determination of wood substitution to ordinary fuel was acquired by accumulating heating value with prediction value of plantation biomass potency; and enquiry for 850 ha mining area resulted that waru wood will contribute about 5,14% to coal total requisite per year, gmelina and sengon buto will contribute about 5,03% and 4,49%, respectively. Keywords: Wood, heating value, substitution fuel
No full textWood has specific base properties of thermal and combustion. Since being grew normally at marginal soil of mining area, sengon buto, waru and gmelina woods were objectified to investigate thermophisic aspect of their usage as substitution fuel in cement production. Examination based on species, ages and horizontal positions of those woods showed that mean of heating value in oven dry and air dry condition was 4.505 kkal/kg and 4.084 kkal/kg, respectively. Determination of wood substitution to ordinary fuel was acquired by accumulating heating value with prediction value of plantation biomass potency; and enquiry for 850 ha mining area resulted that waru wood will contribute about 5,14% to coal total requisite per year, gmelina and sengon buto will contribute about 5,03% and 4,49%, respectively. Keywords: Wood, heating value, substitution fue
The research objectives are to evaluate physical and mechanical properties of OSB based on strand orientations made from akasia wood (Acacia mangium Wild) and afrika wood (Maesopsis eminii Engl). Akasia and afrika wood are used for OSB strand material with phenol formaldehyde (PF) as adhesives and addition of paraffin. OSB made in this research consists of three plies whereas are differed into eight strand orientations. Hot press was carried out at 160ºC and pressure 25 kg/cm² for 15 minutes. Determination of OSB physical and mechanical properties referred to JIS A 5908-2003. Result showed that strand orientations have not affected to OSB physical properties except for linear swelling 24 h, but it significantly influences all mechanical properties of OSB. Wood species has an effect on mechanical properties of OSB in the dry test, wet MOE lengthwise test and OSB physical properties, particularly to OSB density and water absorbing capability at 2 h and 24 h. All of OSB physical properties are meet JIS A 5908-2003 standard, but not all of the mechanical properties such as dry MOE lengthwise, dry MOE and MOR widthwise. The best physical and mechanical properties is presented by OSB made from akasia wood in strand orientation F (core layer is orientated and surface layers are in random, R°/0°/R°), G (core layer is orientated 45° and surface layers are in random, R°/45°/R°), B (surface strand direction is upright to core strand direction, 0°/90º/0°), and C (core layer is in random, surface layers are orientated, 0°/R/0°) whereas all parameters meet JIS A 5908-2003 standard. In comparation with strand orientation B that is frequent used in industry, strand orientation F and G are proficient to raise the modulus elasticity value (MOE) and strength (MOR) as much as 167.8-231.7% and 89.7-109.9%, respectively; especially in widthwise board application. Furthermore, strand orientation F and G are more flexible as structural components. Keywords: Oriented strand board, strand orientation, phenol formaldehyde
No full textThe research objectives are to evaluate physical and mechanical properties of OSB based on strand orientations made from akasia wood (Acacia mangium Wild) and afrika wood (Maesopsis eminii Engl). Akasia and afrika wood are used for OSB strand material with phenol formaldehyde (PF) as adhesives and addition of paraffin. OSB made in this research consists of three plies whereas are differed into eight strand orientations. Hot press was carried out at 160ºC and pressure 25 kg/cm² for 15 minutes. Determination of OSB physical and mechanical properties referred to JIS A 5908-2003. Result showed that strand orientations have not affected to OSB physical properties except for linear swelling 24 h, but it significantly influences all mechanical properties of OSB. Wood species has an effect on mechanical properties of OSB in the dry test, wet MOE lengthwise test and OSB physical properties, particularly to OSB density and water absorbing capability at 2 h and 24 h. All of OSB physical properties are meet JIS A 5908-2003 standard, but not all of the mechanical properties such as dry MOE lengthwise, dry MOE and MOR widthwise. The best physical and mechanical properties is presented by OSB made from akasia wood in strand orientation F (core layer is orientated and surface layers are in random, R°/0°/R°), G (core layer is orientated 45° and surface layers are in random, R°/45°/R°), B (surface strand direction is upright to core strand direction, 0°/90º/0°), and C (core layer is in random, surface layers are orientated, 0°/R/0°) whereas all parameters meet JIS A 5908-2003 standard. In comparation with strand orientation B that is frequent used in industry, strand orientation F and G are proficient to raise the modulus elasticity value (MOE) and strength (MOR) as much as 167.8-231.7% and 89.7-109.9%, respectively; especially in widthwise board application. Furthermore, strand orientation F and G are more flexible as structural components. Keywords: Oriented strand board, strand orientation, phenol formaldehyd
Indonesia has various hardwood species which are known for their low permeability, means difficult to be flown by fluid. The fluid absorption into wood is important especially in preservative treatments, in the treatment before slicing wood sampels for wood anatomy and in wetting air dried wood sampels for specific gravity analyses. The low water absorption of wood are caused by the air presence in cell lumen which could block the water absorption into wood, and anatomy structure of wood itselves. One methode to overcome this problem was vacuum treatment. The aim of this research was to increase water absorption in cold water soak methode in 6 wood species (Pterocarpus indicus Willd, Nephelium lappaceum L., Artocarpus heterophyllus Lamk., Paraserianthes falcataria L., Shorea spp, Dipterocarpus spp) through vacuum treatment. The size of wood samples were 5 x 5 x 20 cm for cross section orientation, 5 x 5 x 10 cm for radial and tangential orientation with 3 replicants. These wood samples were treated with 5 different treatments : vacuum treatment for 1 hour and cold water soak process for 24 hours (V), vacuum treatment for 2 hours and cold water soak process for 24 hours (VV), vacuum treatment for 3 hours and cold water soak process for 24 hours (VVV), vacuum treatment for 1 hour, cold wtaer soak for 1 hour, and vacuum treatment again for 1 hour and cold water soak process for 24 hours (VRV), dan vacuum and soaking treatment simultaneously for 5 hours and cold water soak process for 24 hours (VRVRV) and as control, without vacuum treatment, just cold water soak process for 24 hours. The results of this research showed vacuum treatment could increase water absorption. The highest value of moisture content was obtained at cross section direction in all wood species, followed by tangential and radial direction. However, every wood species showed different reactions to these five different treatments. Keywords:
No full textIndonesia has various hardwood species which are known for their low permeability, means difficult to be flown by fluid. The fluid absorption into wood is important especially in preservative treatments, in the treatment before slicing wood sampels for wood anatomy and in wetting air dried wood sampels for specific gravity analyses. The low water absorption of wood are caused by the air presence in cell lumen which could block the water absorption into wood, and anatomy structure of wood itselves. One methode to overcome this problem was vacuum treatment. The aim of this research was to increase water absorption in cold water soak methode in 6 wood species (Pterocarpus indicus Willd, Nephelium lappaceum L., Artocarpus heterophyllus Lamk., Paraserianthes falcataria L., Shorea spp, Dipterocarpus spp) through vacuum treatment. The size of wood samples were 5 x 5 x 20 cm for cross section orientation, 5 x 5 x 10 cm for radial and tangential orientation with 3 replicants. These wood samples were treated with 5 different treatments : vacuum treatment for 1 hour and cold water soak process for 24 hours (V), vacuum treatment for 2 hours and cold water soak process for 24 hours (VV), vacuum treatment for 3 hours and cold water soak process for 24 hours (VVV), vacuum treatment for 1 hour, cold wtaer soak for 1 hour, and vacuum treatment again for 1 hour and cold water soak process for 24 hours (VRV), dan vacuum and soaking treatment simultaneously for 5 hours and cold water soak process for 24 hours (VRVRV) and as control, without vacuum treatment, just cold water soak process for 24 hours. The results of this research showed vacuum treatment could increase water absorption. The highest value of moisture content was obtained at cross section direction in all wood species, followed by tangential and radial direction. However, every wood species showed different reactions to these five different treatments. Keywords:
Black streak discolorations in the heartwood of teak (Tectona grandis) may lead to considerable economic loss. Unfortunately, the actual properties of the discolored wood remain unknown as yet. In this paper, the influence of wood extractives on black streaked heartwood color was evaluated by successive solvent extraction (n-hexane, ethyl acetate, methanol and hot-water) and color measurement (CIELab system). The change in color co-ordinates, difference in brightness (DL*), difference in redness (Da*), and difference in yellowness (Db*), between sucessively extracted and control sample was also calculated. Color of black streaked heartwood changed by any solvents, whereas n-hexane and ethyl acetate extractions apparently increased the brightness L* values. Extraction with methanol and hot water slightly affected the color differences. However, some differences were still observed in the color properties between the black streaked and normal heartwood, indicating that some substances are polymeric and tightly bound to the cell wall matrix. Some quinones : tectoquinone, tectol, lapachol, desoxylapachol and its isomer, were detected as major compounds by means of GC-MS in the n-hexane and ethyl acetate soluble extracts. The involvement of those compounds, thus, to the blackening heartwood should be investigated in the future studies. Keywords : Tectona grandis, black streak, color, extractives
No full textBlack streak discolorations in the heartwood of teak (Tectona grandis) may lead to considerable economic loss. Unfortunately, the actual properties of the discolored wood remain unknown as yet. In this paper, the influence of wood extractives on black streaked heartwood color was evaluated by successive solvent extraction (n-hexane, ethyl acetate, methanol and hot-water) and color measurement (CIELab system). The change in color co-ordinates, difference in brightness (DL*), difference in redness (Da*), and difference in yellowness (Db*), between sucessively extracted and control sample was also calculated. Color of black streaked heartwood changed by any solvents, whereas n-hexane and ethyl acetate extractions apparently increased the brightness L* values. Extraction with methanol and hot water slightly affected the color differences. However, some differences were still observed in the color properties between the black streaked and normal heartwood, indicating that some substances are polymeric and tightly bound to the cell wall matrix. Some quinones : tectoquinone, tectol, lapachol, desoxylapachol and its isomer, were detected as major compounds by means of GC-MS in the n-hexane and ethyl acetate soluble extracts. The involvement of those compounds, thus, to the blackening heartwood should be investigated in the future studies. Keywords : Tectona grandis, black streak, color, extractive
Penggunaan kertas bekas seperti karton gelombang atau old corrugated container (OCC) dapat membantu konservasi sumberdaya alam dan menjaga mutu lingkungan hidup. Sifat kekuatan pulp-nya yang rendah secara teoretis dapat ditingkatkan melalui substitusi dengan pulp asli. Bambu merupakan sumber potensial untuk menghasilkan pulp substitusi ini. Dalam penelitian ini bambu tali (Gigantochloa apus) berumur 2 tahun dibuat pulp melalui proses soda panas, yang kemudian dipergunakan untuk mensubstitusi pulp OCC dengan kadar 0, 30, 40, 50, 60, 70 dan 100%. Pulp campurannya kemudian diputihkan dengan metode pemutihan elemental chlorine free (ECF) DEDP (chlorine dioxide - alkaline extraction - chlorine dioxide - hydrogen peroxide). Hasil penelitian menunjukkan bahwa nilai indeks tarik tertinggi (30,84 Nm/g) diperoleh dari komposisi pulp bambu : karton (B/K) = 30/70. Nilai indeks sobek dan derajat putih tertinggi dihasilkan oleh komposisi B/K = 100/0 yang masing-masing sebesar 8,45 N.m2/kg dan 77,02%. Nilai indeks retak tertinggi dihasilkan oleh komposisi B/K = 50/50. Komposisi pulp bamboo dan pulp OCC secara nyata mempengaruhi sifat-sifat pulp campuran. Komposisi optimal untuk menghasilkan sifat kekuatan dan sifat optic terbaik diperoleh dari B/K = 70/30. Keywords : Gigantochloa apus, OCC, recycled pulp, substitution
No full textPenggunaan kertas bekas seperti karton gelombang atau old corrugated container (OCC) dapat membantu konservasi sumberdaya alam dan menjaga mutu lingkungan hidup. Sifat kekuatan pulp-nya yang rendah secara teoretis dapat ditingkatkan melalui substitusi dengan pulp asli. Bambu merupakan sumber potensial untuk menghasilkan pulp substitusi ini. Dalam penelitian ini bambu tali (Gigantochloa apus) berumur 2 tahun dibuat pulp melalui proses soda panas, yang kemudian dipergunakan untuk mensubstitusi pulp OCC dengan kadar 0, 30, 40, 50, 60, 70 dan 100%. Pulp campurannya kemudian diputihkan dengan metode pemutihan elemental chlorine free (ECF) DEDP (chlorine dioxide - alkaline extraction - chlorine dioxide - hydrogen peroxide). Hasil penelitian menunjukkan bahwa nilai indeks tarik tertinggi (30,84 Nm/g) diperoleh dari komposisi pulp bambu : karton (B/K) = 30/70. Nilai indeks sobek dan derajat putih tertinggi dihasilkan oleh komposisi B/K = 100/0 yang masing-masing sebesar 8,45 N.m2/kg dan 77,02%. Nilai indeks retak tertinggi dihasilkan oleh komposisi B/K = 50/50. Komposisi pulp bamboo dan pulp OCC secara nyata mempengaruhi sifat-sifat pulp campuran. Komposisi optimal untuk menghasilkan sifat kekuatan dan sifat optic terbaik diperoleh dari B/K = 70/30. Keywords : Gigantochloa apus, OCC, recycled pulp, substitution
Glued-laminated (glulam) beams is one of engineered wood products used for structural applications. The objective of this research is to evaluate characteristics of glulam beams made from Acacia mangium Willd. Laminations used were 2, 4, 6, 8 and 12 cm in widthnesses, 2 cm in thickness and 260 cm in length. Each lamination was graded using Machine Stress Grading (namely by Panter or plank sorter) to determine the modulus of elasticity (MOE) value. The glulam beams was 6 cm x 12 cm in five types of cross-section which arranged by various widths and those MOE of laminations. Glulam beams were bonded by water based polymer isocyanate (WBPI) using 280 g/m2 double glue spread. The research results showed that glulam beams made from A. mangium Willd. fulfilled the JAS 234:2003 standard as on following properties: moisture content, MOE, MOR, shear strength and immersion delamination test. However, performance of glulam was unsatisfactory in wood failure ratio and boiling water soak delamination test. Keywords: Glulam beam, MOE, MOR, shear strength, delamination
No full textGlued-laminated (glulam) beams is one of engineered wood products used for structural applications. The objective of this research is to evaluate characteristics of glulam beams made from Acacia mangium Willd. Laminations used were 2, 4, 6, 8 and 12 cm in widthnesses, 2 cm in thickness and 260 cm in length. Each lamination was graded using Machine Stress Grading (namely by Panter or plank sorter) to determine the modulus of elasticity (MOE) value. The glulam beams was 6 cm x 12 cm in five types of cross-section which arranged by various widths and those MOE of laminations. Glulam beams were bonded by water based polymer isocyanate (WBPI) using 280 g/m2 double glue spread. The research results showed that glulam beams made from A. mangium Willd. fulfilled the JAS 234:2003 standard as on following properties: moisture content, MOE, MOR, shear strength and immersion delamination test. However, performance of glulam was unsatisfactory in wood failure ratio and boiling water soak delamination test. Keywords: Glulam beam, MOE, MOR, shear strength, delaminatio
Subterranean termite, Macrotermes, play important role on plant nutritive cycles through disintegration and decomposition of organic matter processes. In the other hand, subterranean termite can cause wooden damage in the nature and human dormitory as well. Therefore, Macrotermes are potential pest and need to be controlled. Effective pest-control of subterranean termite can be made when their species status and distribution are well known. This research is aimed to identify the status of species and the dispersal of Macrotermes at their natural habitat in order to explore natural bio-resources richness and as an effort towards effective pest-control due to increasing risk of attack. Survey method was used termite samples were collected at four different locations which are defined by global positioning system (GPS). Nest classification is according to Meyer et al. (2003). The nest mapping is based on the elevations of their natural habitat in Gunung Halimun Salak National Park (900-1000 asl), and (600-700 asl), Yanlappa sanctuary (200-300 asl), and Ujung Kulon Nasional Park (0-100 asl). Phylogenetic relationships analysis showed that subterranean termite Macrotermes in the natural forest community are belongs to one big group Macrotermes gilvus Hagen. Based on nest size, the colony of Macrotermes can be classified into three different sizes: large, medium, and small nest. Large and medium nest can be found in large amount in Yanlappa sanctuary (15 and 23 colonies, respectively) and the majority of small nest occurred in Gunung Halimun Salak National Park at 900 asl (78 colonies). Temperature and humidity is the most environmental factor that can influence on termite and other factor is rain fall, soil structure, and plant vegetation. Keywords: Distribution, identify, Macrotermes gilvus Hagen, nest
No full textSubterranean termite, Macrotermes, play important role on plant nutritive cycles through disintegration and decomposition of organic matter processes. In the other hand, subterranean termite can cause wooden damage in the nature and human dormitory as well. Therefore, Macrotermes are potential pest and need to be controlled. Effective pest-control of subterranean termite can be made when their species status and distribution are well known. This research is aimed to identify the status of species and the dispersal of Macrotermes at their natural habitat in order to explore natural bio-resources richness and as an effort towards effective pest-control due to increasing risk of attack. Survey method was used termite samples were collected at four different locations which are defined by global positioning system (GPS). Nest classification is according to Meyer et al. (2003). The nest mapping is based on the elevations of their natural habitat in Gunung Halimun Salak National Park (900-1000 asl), and (600-700 asl), Yanlappa sanctuary (200-300 asl), and Ujung Kulon Nasional Park (0-100 asl). Phylogenetic relationships analysis showed that subterranean termite Macrotermes in the natural forest community are belongs to one big group Macrotermes gilvus Hagen. Based on nest size, the colony of Macrotermes can be classified into three different sizes: large, medium, and small nest. Large and medium nest can be found in large amount in Yanlappa sanctuary (15 and 23 colonies, respectively) and the majority of small nest occurred in Gunung Halimun Salak National Park at 900 asl (78 colonies). Temperature and humidity is the most environmental factor that can influence on termite and other factor is rain fall, soil structure, and plant vegetation. Keywords: Distribution, identify, Macrotermes gilvus Hagen, nes
Six species of bamboos, that were andong bamboo (Gigantochloa verticillata), tali bamboo (Gigantochloa apus), hitam bamboo (Gigantochloa nigrocillata), ampel bamboo (Bambusa vulgaris), betung bamboo (Dendrocalamus asper), and kuning bamboo (Bambusa vulgaris), were analyzed for their fiber morphological as well as their physical-chemical properties. Results of these analysis would be used as a matter of consideration in choosing species of bamboos to be used as raw material for pulp and paper. Fiber morphological analyses include determination of fiber dimensions and followed by calculation of derivation of fiber dimensions. Determination of fiber dimensions includes fiber length, fiber diameter, lumen diameter and cell wall thickness, while calculation of derivation fiber dimensions includes runkell ratio, felting power/slenderness), muhlsteph ratio, coefficient of rigidity and flexibility ratio. Physical analyses include moisture content and specific gravity, while chemical analyses include determination of extractive (ethanol-benzene), hot water solubles, cold water solubles, lignin, holocellulose, ash and silicate contents. Results of this study showed that of the six species of bamboos studied, kuning bamboo had the most suitable properties as raw material for pulp and paper, followed by betung, tali, andong, hitam, and ampel bamboos. Keywords : Bamboo, fiber morphology, physical-chemical properties, pulp, paper
No full textSix species of bamboos, that were andong bamboo (Gigantochloa verticillata), tali bamboo (Gigantochloa apus), hitam bamboo (Gigantochloa nigrocillata), ampel bamboo (Bambusa vulgaris), betung bamboo (Dendrocalamus asper), and kuning bamboo (Bambusa vulgaris), were analyzed for their fiber morphological as well as their physical-chemical properties. Results of these analysis would be used as a matter of consideration in choosing species of bamboos to be used as raw material for pulp and paper. Fiber morphological analyses include determination of fiber dimensions and followed by calculation of derivation of fiber dimensions. Determination of fiber dimensions includes fiber length, fiber diameter, lumen diameter and cell wall thickness, while calculation of derivation fiber dimensions includes runkell ratio, felting power/slenderness), muhlsteph ratio, coefficient of rigidity and flexibility ratio. Physical analyses include moisture content and specific gravity, while chemical analyses include determination of extractive (ethanol-benzene), hot water solubles, cold water solubles, lignin, holocellulose, ash and silicate contents. Results of this study showed that of the six species of bamboos studied, kuning bamboo had the most suitable properties as raw material for pulp and paper, followed by betung, tali, andong, hitam, and ampel bamboos. Keywords : Bamboo, fiber morphology, physical-chemical properties, pulp, pape
Pangsor (Ficus callosa WILLD) and kecapi (Sandoricum kucape MERR) are usually planted in garden and rural forest. The objective of this study was to determine its specific gravity (SG), maximum crushing strength (σc//), longitudinal modulus elasticity (EL), and Poisson’s ratio (n). The compression test was conducted referring to ASTM D143-94(2000) using UTM Instron 3369 which is equipped with two biaxial clip on extensometers. The result showed that vertical and horizontal position of wood in the trees statistically significant influenced on SG and σc//. Horizontal position in Pangsor wood affected its EL, but the other position in both species were not significantly different. There were poor correlations between SG with EL and σc//. Poisson’s ratio value of both woods were in a range 0.0045 – 0.275 for longitudinal-radial direction (nLR), and 0.0151 – 0.1289 for longitudinal-tangensial direction (nLT). Keywords : Longitudinal Modulus of Elasticity, Maximum Crushing Strength, Poisson’s Ratio, Pangsor wood, Kecapi wood
No full textPangsor (Ficus callosa WILLD) and kecapi (Sandoricum kucape MERR) are usually planted in garden and rural forest. The objective of this study was to determine its specific gravity (SG), maximum crushing strength (σc//), longitudinal modulus elasticity (EL), and Poisson’s ratio (n). The compression test was conducted referring to ASTM D143-94(2000) using UTM Instron 3369 which is equipped with two biaxial clip on extensometers. The result showed that vertical and horizontal position of wood in the trees statistically significant influenced on SG and σc//. Horizontal position in Pangsor wood affected its EL, but the other position in both species were not significantly different. There were poor correlations between SG with EL and σc//. Poisson’s ratio value of both woods were in a range 0.0045 – 0.275 for longitudinal-radial direction (nLR), and 0.0151 – 0.1289 for longitudinal-tangensial direction (nLT). Keywords : Longitudinal Modulus of Elasticity, Maximum Crushing Strength, Poisson’s Ratio, Pangsor wood, Kecapi woo