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All Journal Jurnal Ilmu dan Teknologi Hasil Hutan Indonesian Journal of Forestry Research Jurnal Ilmu dan Teknologi Kayu Tropis Teknologi Indonesia

Wahyu DWIANTO

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Author-ID : 256692

Agriculture, Biological Sciences & Forestry Computer Science & IT

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CENTRAL KALIMANTANâS FAST GROWING SPECIES: SUITABILITY FOR PULP AND PAPER Adi, Danang Sudarwoko; Wahyuni, Ika; Risanto, Lucky; Rulliaty, Sri; Hermiati, Euis; Dwianto, Wahyu; Watanabe, Takashi
Indonesian Journal of Forestry Research Vol 2, No 1 (2015): Indonesian Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Fast growing wood species could be promising to fulfill the gap between wood demand and supply. Due to their low quality, the utilization of fast growing wood species has been limited to pulp and paper. Our previous study on the fiber characteristic and density of the 30 unutilized fast growing wood species from PT Sari Bumi Kusuma, Central Kalimantan, showed that there were five species which could be promising as pulp and paper material. These wood species have fiber lengths of more than 2200 Âµm. This research was conducted to get information another property of the five woods to more discover their potential utilization, especially for pulp and paper material. The wood species investigated were Endospermum diadenum, Dillenia sp., Adinandra dumosa, Adinandra sp., and Nauclea junghuhnii. The results showed that these five species have a long of fiber length, which are classified in Class I, low to medium density, fiber derived value which the total score felt in the class I. The chemical compositions showed that extractive, holocelullose, Î±-cellulose, and lignin contents were 1.74-4.12%, 62.73-73.83%, 37.24-46.97%, 29.68-38.92%, respectively. Based on fiber characteristic, density, and chemical properties, these five species could be used as an alternative raw material for pulp and paper industries.Â

EXPLORATION OF POTENTIAL TREE SPECIES IN SUMBA ISLAND Dwianto, Wahyu; Amin, Yusup; Pramasari, Dwi Ajias; Lestari, Eka
Teknologi Indonesia Vol 41, No 1 (2018)
Publisher : LIPI Press

ABSTRACTSumba Island is a part of Wallace region which located in between Asia and Australia continents. Therefore it has a lot of endemic flora and fauna species. Laiwangi Wanggameti National Park (LWNP) is one of area in Sumba Islands which represented of this condition. The aim of this study is to determine the potential of tree species in Sumba Island based on strength class and commercial class. The wood samples were taken from 9 plots by wood increment borer at 1.3 meters height (breast height). The physical properties (specific gravity) were measured to determine the wood strength classes. The results found 35 species of potential tree species which can be classified into strength class II (13 species), III (19 species), IV (2 species), and V (1 species). Based on commercial classes, 63% of the tree species were classified into lesser known timbers. Furthermore, we think the potential tree from LWNP can be used for research purpose in forestry, especially in domestication study. Keywords: wood strength class, commercial class, bor riap, Laiwangi Wanggameti National Park, domestication ABSTRAKPulau Sumba merupakan bagian dari kawasan Wallacea yang berada di antara Benua Asia dan Australia. Oleh karena itu, pulau ini memiliki banyak flora dan fauna endemik. Taman Nasional Laiwangi Wanggameti (TNLW) adalah suatu wilayah di Pulau Sumba yang merepresentasikan kondisi secara umum di kawasan tersebut. Tujuan dari penelitian ini adalah untuk menentukan jenis kayu potensial di Pulau Sumba berdasarkan kelas kuat dan kelas komersial. Sampel kayu diambil dari 9 plot dengan menggunakan bor riap pada ketinggian 1,3 meter (setinggi dada). Sifat fisik (berat jenis) diukur untuk menentukan kelas kuat kayu. Hasil menunjukkan bahwa ditemukan 35 jenis kayu yang potensial yang dapat diklasifikasikan ke dalam kelas kuat II (13 jenis), III (19 jenis), IV (2 jenis), dan V (1 jenis). Berdasarkan kelas komersial, 63% jenis kayu yang didapatkan merupakan jenis kayu yang kurang dikenal. Oleh karena itu, jenis-jenis kayu yang potensial dari TNLW ini dapat digunakan untuk kepentingan penelitian di bidang kehutanan, lebih khususnya pada penelitian tentang proses domestikasi jenis-jenis tersebut. Kata Kunci: kelas kuat kayu, kelas komersial, increment borer, Taman Nasional Laiwangi Wanggameti, domestikasi

Fiksasi Bambu Gombong dan Tali Fixation of Gombong and Tali Bamboos Wahyu Dwianto; Toshiro Morooka; Misato Norimoto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 2, No 1 (2004): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

This research describes stress relaxation measurement to understand the fixation mechanism of compressive deformation of water saturated Gombong bamboo (Gigantochloa pseduarundinaceae) and Tali bamboo (Gigantochloa apus). Stress relaxations are measured by compressing the specimens in radial direction to 0.2 strains between 110ºC and 190ºC for various periods of time in electro oil hydraulic testing system equipped with an autoclave, which was heated by high temperatures saturated steam. The stress approximately disappears in 60min at 170ºC, in 30min at 180ºC, and in 20 min at 190ºC for Gombong bamboo. On the other hand, the fastest release of stress is found for Tali bamboo. The plots of relationship between residual stress and strain recovery of Gombong and Tali bamboos lay on a single curve, respectively. The relationship is similar to that of Sugi wood by heating. However, the weight loss of the two bamboos is extremely higher than that of wood. The fixation is achieved at a weight loss of 20% for Gombong and Tali bamboos. From these results, the fixation mechanism is considerably dominated by the decomposition of hemicelluloses and lignin.

Sifat Ketahanan Api Lima Jenis Kayu dengan Pelapisan Carbon Phenolic Spheres (CPS) yang Diuji dengan Cone Calorimeter Fire Resistance Properties of Five Wood Species Laminated with Carbon Phenolic Spheres (CPS) Tested by Cone Calorimeter Subyakto Subyakto; Wahyu Dwianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 2, No 1 (2004): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

In all aspects of wood utilization their fire resistance properties are very important; therefore efforts to enhance those properties are needed. In the previous study, graphite phenolic spheres (GPS) laminated on woods and plywood enhanced their fire properties. Carbon phenolic spheres (CPS) is a new material made from a mixture of wood char and phenolic resin, this material is cheaper than GPS. In the present experiment, CPS sheet was laminated on five wood species and their fire resistance properties were evaluated using cone calorimeter.　The five wood species are randu (Bombax ceiba L.), angsana (Pterocarpus indicus Jacq.), mindi (Melia azedarach L.), puspa (Schima wallichii DC Korth), and mahoni (Swietenia mahagony L. Jacq). The specimen was 100 mm x 100 mm with thickness of 30 mm tested with cone calorimeter in accordance with ISO 5660 standard. Using cone calorimeter a homogenous heat was exposed to the surface of wood specimen, and ignited with igniter. About 1 mm thick of CPS sheet was laminated on the wood surface (100 mm x 100 mm). Specimen was tested at horizontal position and at heat flux of 40 kW/m2. On the unexposed wood surface, thermocouple was attached to measure increases of temperature. Results showed that five species of wood laminated with CPS have higher fire properties compared with control wood, however compared with woods laminated with GPS those results were lower.

Modifikasi Alat Pelengkung Kayu Skala Pilot dengan Menggunakan Pemanas Modification of Pilot-scale Wood Bending by Heating Elements Teguh Darmawan; Jayadi Jayadi; Sudijono Sudijono; Ika Wahyuni; Yusuf Amin; Wahyu Dwianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 4, No 1 (2006): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

This paper deals with manufacturing and modification of pilot-scale wood bending machine by heating elements. The machine has specifications as follows: 1000 mm width; 1305 mm height; 430 mm and 470 mm radius of upper part and bottom part of bent plates, respectively; and a manual stick pressure with 870 mm length. The upper part and bottom part of bent plates are equipped with heating elements, which the maximum of temperature is arranged to 200°C by the electric force of 220V/2000 watt. Left and right sides of bent plates are covered by 1150 mm x 950 mm insulation board to maintain the heat. From the temperature measurement, the heating plates were reached 50°C in 2.5 minutes, 100°C in 9.5 minutes, and 180°C in 28 minutes. The modified machine has successfuly bent Acacia solid wood with dimensions of 1100 mm(L) x 50 mm(T) and 10 mm, 20 mm, and 30 mm in thickness (R).

Pengaruh Suhu dan Tekanan Uap Air terhadap Fiksasi Kayu Kompresi dengan menggunakan Close System Compression Temperature and Steam Pressure Dependency on the Fixation of Compressed Wood by Close System Compression Yusuf Amin; Wahyu Dwianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 4, No 2 (2006): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

It is known that compression wood by heat treatment needs approximately 20 hours at 180ºC to attempt the permanent fixation of compressive deformation. On the other hand, even the permanent fixation of compressive deformation by steam treatment is reached in 10 minutes at the same temperature, this method needs expensive apparatus and inapplicable for large wood dimensions. These both problems can be solved by Close System Compression (CSC) method. CSC is a method to press the wood inside an airtight seal chamber, which is placed between the two hot press plates. Wood moisture contents, which evaporate due to heat from hot press, are trapped inside the CSC and produce steam. The wood species used in this research was Randu (Bombax ceiba. L) with dimensions of 2 cm (L) x 2 cm (T) x 3 cm (R). The wood specimens were compressed into 2 cm in radial direction inside the CSC at 140ºC, 160ºC, and 180ºC for 10 min, 20 min and 30 min. They were compressed in air-dried, water saturated and steam saturated conditions, because it was predicted that moisture content of wood and steam pressure, which was produced inside the CSC has significantly effects on the fixation of wood, beside the temperature.The result shows that moisture content of the wood has an effect on the decreasing of recovery of set. However, it was needed 180ºC temperature and 10 kg/cm2 steam pressure to attempt the permanent fixation. Therefore, it was necessary to add water to produce the steam pressure besides that was produced from the evaporation of wood moisture content.

Permanent Fixation of Radially Compressed Bamboo in Dry Condition by Heating and Its Mechanism Bambang Subiyanto; Wahyu Dwianto; Takashi Higashihara; Toshiro Morooka; Misato Norimoto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 1 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The stress-strain relationship and stress relaxation of oven-dried bamboo in radial compressed by heating were investigated. The effect of heating temperature and time on the weight loss, residual stress and strain recovery were also examined. The results indicated that the apparent of stress-strain curve (SS-curve) of Indonesian bamboo was different with Mousou bamboo and Sugi wood. The apparent SS-curve of Mousou bamboo was same as general SS-curve of wood under heating. The effect of heating temperature on yield stress of oven-dry bamboo had different results with the Sugi wood. The yield stress of bamboo decreased slightly up to heating temperature of 140 °C, then it was significantly decreased with increasing temperature. The decreasing yield stress of bamboo at heating temperature above 140 °C could be due to degradation or decomposition of existing extractive component and hemicelluloses in bamboo by heating. Time to achieve stress relaxation decreased with increasing heating temperature. The stress relaxation of bamboo was attained faster than that of Sugi wood. Tali bamboo had a fastest to attain stress relaxation than others type of bamboo. The residual stress and strain recovery decreased with decreasing weight loss. The most interesting finding was residual stress of Indonesian bamboo (Gombong and Tali bamboos) was attained zero and stress recovery less than 0.2 when the weight loss at about 4%.Key words: bamboo, permanent fixation, stress-strain.

Fiber and Chemical Characteristics of Branchwoods of Three Meranti Species Danang S Adi; Lucky Risanto; Ika Wahyuni; Sukma S Kusumah; Wahyu Dwianto; Taka Hayashi
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 2 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The fiber and chemical characteristics of branchwoods of three meranti species namely meranti sangkan, meranti bakau, and meranti bunga kulit hitam from Bukit Batu Peat Swamp Forest, Riau were observed. The aim of this research was to discover the potential utilization of these three meranti species based on their characteristic. The result showed that holocellulose contents of meranti sangkan, meranti bakau, and meranti bunga kulit hitam were 72.97%, 75.28%, and 69.88%, whereas the α-cellulose contents were 43.55%, 51.14%, and 43.25%, respectively. meranti sangkan had the highest lignin content (35.99%) followed by meranti bakau (34.21%) and meranti bunga kulit hitam (32.18%). meranti Bunga kulit Hitam had the highest extractive content (2.24%) followed by meranti sangkan (1.66%) and meranti bakau (1.08). Furthermore, the fiber length of meranti bunga kulit hitam, meranti sangkan, and meranti and meranti Hitam were 1475.45 μm, 1475.45 μm, 1442.62 μm, and 1205.23 μm, respectively. The values of fiber derivative of the three meranti species were slightly differ from class I, except for felting power that was classified in class III. The result also showed that the branchwoods of the three meranti species are suitable for pulp and paper raw material.Key words: fiber and chemical properties, meranti bakau, meranti sangkan, meranti bunga kulit hitam, peat swamp forest

Maximum Compression Level Measurement of Oil Palm Trunk Rudi Hartono; Imam Wahyudi; Fauzi Febrianto; Wahyu Dwianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 9, No 1 (2011): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

The objectives of this research were to study the density distribution and stress-strain curve (SSC) of oil palm trunk (OPT). The 40 year-old of OPT was used for these experiments. The specimen was taken from 1 m, 3 m and 5 m height of OPT with dimension of (2 x 2 x 2) cm3 for density distribution measurements. The interval of it was 2 cm from the outer near the bark to the inner near the center. The specimen for SSC measurements was taken only from 1 m height with the same dimension, interval, and position, as well. These specimens were treated into three conditions, i.e. air dry, wet and water saturated. The results showed that density of OPT was 0.23-0.74 g cm-3. The stress-strain curves showed that water saturated and wet conditions were easier to compress than that of air dried condition. The compression level increased from the outer to the center of the trunk. The center part can be compressed into 67% in air dry condition and 72-73% in wet and water saturated conditions from their initial thickness. Relationships between compression level, showing by strain, and density expressed as polynomial equations, regardless of the three conditions.Key words: compression, density distribution, OPT, SSC, vascular bundles

Karakteristik LVL Lengkung dengan Proses Kempa Dingin Characteristic of LVL Bent by Cold Press Process Teguh Darmawan; Wahyu Dwianto; Yusup Amin; Kurnia Wiji Prasetyo; Bambang Subiyanto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 7, No 2 (2009): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Bending LVL (Laminated Veneer Lumber) is a more effisien method to manufacture bent wood components compare to other methods in raw materials point of view. The Bending LVL was made from Sengon veneers by cold press process with variation of Water Based Polymer-Isocyanate adhesive of 250, 280, 310 g/m2 and bend radius of 200,300, 400 mm. The results showed that the physical properties of Bending LVL made by using Water Based Polymer-Isocyanate adhesive and cold press process was fit with JAS 1639/1986 standard. The optimum adhesive concentration and bend radius was 250 g/m2 and 20 cm, respectively

Co-Authors Abdurachman Abdurachman Akbar, Fazhar Bambang Subiyanto Danang S Adi Danang Sudarwoko Adi Efrida Basri Eka Lestari Euis HERMIATI Fauzi Febrianto Gopar, Mohamad Ika WAHYUNI Ika WAHYUNI Imam Wahyudi Indrawan, Imam Wahyudi Jayadi Jayadi Kurnia Wiji Prasetyo Kusumah, Sukma Surya Lisman Suryanegara Lucky Risanto Lucky Risanto Misato Norimoto Pramasari, Dwi Ajias Purnomo, Deni Rudi Hartono Sejati, Prabu Satria Sri Nugroho Marsoem Sri Rulliaty Sri Rullyati SUBYAKTO SUBYAKTO Sudarmanto Sudarmanto, Sudarmanto Sudijono Sudijono Sukma S Kusumah Sunarko Sunarko Taka Hayashi Takashi Higashihara Takashi Watanabe Teguh DARMAWAN Toshiro Morooka Triwibowo, Dimas Yusuf Amin Yusup AMIN Yusup AMIN

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