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Jurnal Ilmu dan Teknologi Kayu Tropis

JITKT
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Published by Masyarakat Peneliti Kayu Indonesia

ISSN : - EISSN : 16933834 DOI : -

Core Subject : Agriculture,

Agriculture, Biological Sciences & Forestry

Jurnal ini mempublikasikan artikel asli baik penelitian dasar maupun terapan di bidang ilmu pengetahuan dan teknologi kayu, bahan berlignoselulosa bukan kayu, hasil hutan lainnya dan industri hasil hutan.

Arjuna Subject : -

Articles 316 Documents

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Pengembangan Papan Komposit dari Limbah Perkebunan Sagu (Metroxylon sago Rottb.) (Development of Composite Board made from Sago (Metroxylon sago Rottb.) Plantation Waste) Sukma S Kusuma; Ruslan Ruslan; Muhammad Daud; Ika Wahyuni; Teguh Darmawan; Yusup Amin; Muh. Y Massijaya; Bambang Subiyanto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 8, No 2 (2010): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Plantation waste has gained increasing attention as an alternative raw material for use in the manufacture of composite boards, i.e. waste of sago plantation. Medium density composite boards were made from zephyr of sago midrib to evaluate the effects of resin and adhesive content levels. The boards were fabricated using polyurethane (PU) and phenol formaldehyde (PF) resin with three levels of adhesive content i.e. 10%, 12%, and 14%. Physical (moisture content, density, water absorption, and thickness swelling) and mechanical (Modulus of Rupture, Modulus of Elastisity, Screw Holding, and Internal Bonding) properties of composite board were evaluated according to JIS A 5908-2003 standard. Research result showed that properties of composite board made from sago frond with 14% content level of polyurethane adhesive better than other composite board. Based on composite board properties, the board was suitable as building raw material and furniture i.e. partition, cupboard, table, and roof.

Compression Strength Perpendicular to the Grain of Cross Laminated Timber (CLT) of the Three Community Wood Species Muthmainnah Muthmainnah; Sucahyo Sadiyo; Lina Karlinasari
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 12, No 2 (2014): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Cross Laminated Timber (CLT) is an engineered wood products composed of multi-layered panel of lumber where each layer of boards is placed cross-wise to adjacent layers. The purpose of the present research was to evaluate the compression strength perpendicular to grain of CLT composed of 5 layers tested with line loads in square surface. The position of line loads was in the centre and edge of sample orientated both in parallel and perpendicular to the grain direction at the CLT-surface. The CLT specimens were (15x20x20) cm3 (thickness, width and length) in size and were prepared from three community timber, i.e. sengon (Paraserianthes falcataria), mindi (Melia azedarach L.), and nangka (Artocarpus heterophyllus Lamk.). The result showed that the edge loading position resulted in lower compression strength than that of the central loading position. The highest comprresion strength was retained by CLT tested in the center loading position oriented to perpendicular to the grain direction. The highest compression strength perpendicular to grain was retained by CLT of nangka wood (20.28 kg cm-2) followed successively by those of CLT of mindi (25.97 kg cm-2) and CLT of sengon(8.50 kg cm-2).Keywords: CLT, compressive strength perpendicular to grain, line load, mindi, nangka, sengon

Pemanfaatan Ekstrak Enzim Jamur Humicola sp. Sebagai Biotermitisida Utilization of Humicola sp. Enzyme Extract as Biotermiticide Ikhsan Guswenrivo; Titik Kartika; Didi Tarmadi; Sulaeman Yusuf
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 6, No 1 (2008): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Fungal spore can be used for biotermiticide, since it has high pathogen properties and environmentally safe. However, the utilization of enzyme extract of fungi can be developed as an alternative way to minimize the impact caused by the spore when they are used as biotermiticide. This research was done to observe the ability of enzyme extract from Humicola sp. The fungus was inoculated in sorghum substrate and grown in it by adding either colloidal chitin or without colloidal chitin to the media as variation of the medium composition. Extraction was done after 3, 5, and 7 days of incubation time. Extract was done by using cold sterilized water (40C). Then the extract kept it at low temperature (40C). Bioassay of extract enzyme was done by spraying and baiting method. Result of the bioassay showed, Humicola sp enzyme extract was grown from medium adding with colloidal chitin and incubation for 7 days give highest mortality of termite increase to 100% after 14th day observation.

Ethanol Production Using SSF Method from Calcium Hydroxide Pretreated Wood Meal Denny Irawati; Johannes PG Sutapa; Ardi B Firmansyah; Permana A Mardika; Farkhan W Nugroho; Sri N Marsoem
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 11, No 1 (2013): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objective of this research was to determine the effect of wood waste pretreatment with calcium hydroxide on the yield of ethanol. Wood waste of jati (Tectona grandhis) and sengon (Paraserianthes falcataria) were treated with 20% of CaOH2 solution for 4 days at 50, 60, and 70 °C preceding ethanol production with simultaneous saccharification and fermentation (SSF) method. In the present SSF process, saccharification and fermentation were respectively carried out by the use of cellulase and Saccharomyces cerevisiae in a shaker incubator with 12 rpm at 30 °C for 72 hours. The resulting ethanol was then analyzed using gas chromatography. The chemical compounds of woods (i.e. extractive, holocellulose, alpha-cellulose, pentose and lignin) were also evaluated. It was found that increasing the temperature of alkaline pretreatment increased ethanol yield for both sengon and jati wood wastes. The ethanol yield was in the range of 0.027-0.054%. CaOH2 pretreatment at 70 oC of sengon wood wastes resulted in the highest yield. At elevated temperature, the pretreatment of wood wastes decreased the content of extractive, holocellulose, lignin and pentosan of sengon and jati wood wastes. These were in the contrary to that of increased alpha cellulose content.Key words: calcium hidroxyde, enzymatic saccharification, ethanol, Paraserianthes falcataria, Tectona grandis

Studi Perbandingan Metode Sampling Bor Riap dengan Disk untuk Pengukuran Proporsi dan Dimensi Serat Kayu Sengon Salomon (Paraserianthes falcataria, (L.) Nielsen) Comparative Study of Two Types Sampling Method for Measuring Cell Proportion and Fiber Dimension on Sengon Salomon Wood (Paraserianthes falcataria (L.) Nielsen) Harry Praptoyo
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 3, No 2 (2005): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objective of this research was to determine the differentiation on the measurement result of cell proportion and fiber dimension that caused by the different of sampling methods. The research was conducted at the Laboratory of Wood Structure and Properties, Faculty of Forestry, Gadjah Mada University.The research designed with completely random design composed by factorial experiment, which considered two factors, namely: 1) Sampling methods: disk method and drill method, and 2) Radial distribution: center/pitch, center-bark and near bark. Analysis of variance was conducted in order to evaluate the variation in all data of two factors mentioned above. The relationship between sampling method and radial distribution was also evaluated. The data variables were: fiber length, cell diameter, lumen diameter, cell wall thickness, and the proportion of vessel, rays, fiber and parenchyma. The observation on fiber length was conducted by using light microscope or scanning electron microscope. The observation on cell proportion was conducted by using photomicroscope and dot grid.The results of the research showed that the different of sampling methods have not any influenced to the measurement result of cell proportion and fiber dimension on Sengon wood. Whereas the radial distribution of wood has significant influenced in fiber dimension, especially in fiber length and cell wall thickness, but in cell proportion, radial distribution has not influenced.

Analisis Biaya Pengendalian Persediaan Bahan Baku Kimia pada Pabrik Bubur Kertas (Cost Analysis of a Pulp Mill’s Chemicals Inventory Control) Bintang CH Simangunsong; Elizabeth R Simangunsong
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 14, No 2 (2016): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

A pulp and paper company had a chemical raw materials piling-up issue, which affected its quality and increased its inventory cost. Hence, a proper inventory control policy of these is needed. This research were aimed to analyze the company‘s inventory control policy on its chemicals and inventory cost in the period 2012-2013 and recommend the inventory control plan for the year 2014. The lot sizing techniques of Lot for Lot, Economic Order Quantity, Least Unit Cost, and Least Total Cost were investigated and the results were compared with the company’s inventory cost. The chemicals inventory cost for the year 2014 was also determined based on chemical estimates needed in the year 2014. Chemical estimates were derived from forecasted monthly pulp production in the year 2014 that obtained by the least square dummy variables regression technique using the monthly pulp production data in the period 2012-2013 and the company’s Standard Operating Procedures. The results showed the company’s inventory cost was 6.34% higher than inventory costs calculated by those four techniques when company failed to maintain its ending inventory to the predetermined safety stock level. Otherwise, the company could keep its chemicals control policy in the year 2014.Keywords: cost analysis, inventory cost, inventory control, lot sizing techniques, pulp production

Effect of Wood Species and Layer Structure on Physical and Mechanical Properties of Strand Board wahyu Hidayat; Mohamad I Sya'bani; Handian Purwawangsa; Apri H Iswanto; Fauzi Febrianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 2 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objectives of this research were to evaluate the effect of wood species and layer structure on physical and mechanical properties of strand board made from Paraserianthes falcataria, Maesopsis eminii and Acacia mangium woods collected from planted forest in Bogor district, Indonesia. The densities of P. falcataria, M. eminii and A. mangium woods were 0.36, 0.41 and 0.46 g cm-3, respectively. Three types of layer structures namely perpendicular, parallel, and random orientation were applied. Methylene diisocyanate (MDI) resin with 7% resin amount (w/w) was used. The physical and mechanical properties of strand board were evaluated based on CSA 0437.0 standard. The results indicated that strand board manufactured from wood with lower density (P. falcataria) had higher mechanical properties (modulus of rupture, modulus of elasticity and internal bond) and lower dimensional stability (water absorption and thickness swelling) compared to strand board manufactured from higher density (A. mangium), vice versa. Strand orientation strongly affected the physical and mechanical properties of board with perpendicular orientation showed superior performance as compared to parallel and random orientation. Physical and mechanical properties of oriented strand board (OSB) made from fast growing tree species met the requirement of CSA 0437.0 standard for grade O-1 OSB panels.Key words: layer structure, methylene diisocyanate resin, strand board, tropical wood species,

Sifat Antirayap Resin Damar Mata Kucing dari Shorea javanica K. et V. Antitermic Properties of Resin from Shorea javanica K. et V Rita Kartika Sari; Wasrin Syafii; Kurnia Sofyan; Muhammad Hanafi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 2, No 1 (2004): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

This study was undertaken primarily to isolate and identify substances from resin of Shorea javanica K. et. V. that might be responsible to inhibit the termite activity of Coptotermes curvignathus Holmgren. Approximately 500 gram of dried-resin was extracted with acetone solvent. The acetone extract was then fractionated into n-hexane, diethyl ether, ethyl acetate, and insoluble fraction (residue). The no-choice bioassay test was carried-out by treating paper discs with extracts at the concentration of 2.0%, 4.0%, 6.0%, 8.0%, 10.0%, 12.0% (W/W), and 0.0 % as control. The bioassay test showed that n-hexane and diethyl ether soluble fraction exhibited highest antitermic properties at Lethal Concentration (LC)50 value of 1.62% and continuation fraction showed N3 of n-hexane fraction an EE1 of diethyl ether fraction exhibited highest toxicity at LC50 value of 1.23 % and 1.65%. Further investigation of the n-hexane soluble fraction by using CC, GC-MS, FTIR, UV-Vis, and NMR led to the isolation and identification of the main compound, namely friedelin, while the diethyl ether soluble fraction contains vulgarol B; 3,4-Secodamar-4(28)-en-3-oic acid; (7R,10S)-2,6,10-Trimethyl-7, 10–epoxy-2,11-dodecadien; and junipene (decahydro-4,8,8-trimethyl-1,4-methanoazulene)

Peningkatan Sifat Papan Partikel Sengon dengan Perlakuan Perendaman Air Dingin (Improvement the Propoerties of Particleboard Made from Sengon with Cold Water Immersion Treatment) Marwanto, Marwanto; Maulana, Sena; Maulana, Mohammad I; Wistara, Nyoman J; Nikmatin, Siti; Febrianto, Fauzi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 16, No 2 (2018): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Jurnal Ilmu dan Teknologi Kayu Tropis

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The objectives of this research is to evaluate the physical and mechanical properties of particle board made from sengon and mangium woods treated with cold water immersion. Particles of sengon and mangium immersed in cold water for 24 hours. The particles of sengon and mangium are combined with a ratio of 100: 0; 0: 100; 75:25; and 50:50. Particle boards are made in size (30x30x0,9) cm3 with target densities of 0.7 g cm-3. The particle board was binded with methylene diphenyl diisocyanate (MDI) adhesive at 10% content and hot press at 140 °C with 25 kgf cm-2 for 7 minutes. The physical and mechanical properties of particle board are evaluated according to JIS A 5908-2003 standard. The physical and mechanical properties of particle board were much affected by particle combination and cold water immersion treatment. The physical (i.e density, moisture content, water absorption (WA), and thickness swelling (TS)) and mechanical properties (ie. modulus of elasticity (MOE), modulus of rupture (MOR), and internal bonding (IB)) were evaluated. The results showed that cold water immersion improved dimensional stability (WA and TS) of particle board obtained. However, some mechanical properties decreased.Keyword: cold water immersion, mangium, particleboard, sengon

Steam and Microwave Pretreatments in the Preparation of Bioethanol from Sugar Palm Kernel Nyoman J Wistara; Martua YS Nababan; Rahmi N Hidayah
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 15, No 1 (2017): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

It is paramount to develop bioethanol production based on the utilization of less important carbohydrate based feedstock such as the sugar palm kernel. In the present works, the kernel powder of sugar palm was hydrolyzed by enzymatic and acidic procedures heated either by autoclaving or microwaving. Fermentation of the resulting reducing sugars was then carried out by Saccharomyces cerevisiae at the concentration of 3, 10, and 17% for 24, 48, and 72 hours. It was found that the highest hydrolysis efficiency was by autoclaved acid hydrolysis (92.52%). On the other hand, the highest fermentation efficiency was obtained by 24 hours fermentation with a 17% S. cerevisiae of the resulting sugar from autoclaved enzymatic hydrolysis (97.36%), and the highest ethanol yield was obtained from autoclaved acid hydrolysis fermented for 72 hours with 17% S. cerevisiae (76.49%). Keywords: bioethanol, fermentation, hydrolysis, S. cerevisiae, sugar palm kernel

Page 18 of 32 | Total Record : 316

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