Istie Sekartining Rahayu
The Division Of Wood Quality Improvement, Department Of Forest Products, Faculty Of Forestry, Bogor Agricultural University, Bogor, Indonesia

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Sifat Fisis, Mekanis Serta Keawetan Batang Kelapa Hibrida Istie Sekartining Rahayu
Jurnal Ilmu Pertanian Indonesia Vol. 11 No. 1 (2006): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Nowadays, wood industry in Indonesia suffers from lack of wooden raw material because of the demand is greater than the supply. In order to solve this problem, we need to enhance the use of wood by optimalizing the use of wooden raw material wich has a great potensial, but not well used, for example hybride coconut wood. The purpose of this research were to determine physical, mechanical and chemical properties of hybride coconut wood and its vertically and horizontally variation in order to optimalize the use of hybride coconut wood. This research used three hybride coconut steems, the 6 cm disks were extracted from each stem at 1, 4, 7, and 10 m heights. The analyze of vascular bundle and parenchyma consisted of covered area per cm2 and their chemical composition. Hybride coconut wood had a low specific gravity because vascular bundle covered area was lower than parenchyma per cm2 and low wood substance portion. Low specific gravity caused low mechanical properties. Hight moisture content (specially fresh one) was cause by sugar and starch extractives which had high hygroscopic ability. These extractives content also caused it to be easily attacked by wood destroying factors. Parenchyma covered area per cm2 caused high sugar and starch content. Height and depth factors were visible influence at almost all basic properties of vascular bundle and parenchyma at different level.
Distribusi Sel Pori pada Kayu Tarik dan Korelasinya dengan Komposisi Lignin Deded Sarip Nawawi; Istie Sekartining Rahayu; Nyoman Jaya Wistara; Rita Kartika Sari; Wasrin Syafii
Jurnal Ilmu Kehutanan Vol 13, No 1 (2019)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (349.755 KB) | DOI: 10.22146/jik.46207

Abstract

Sifat anatomi kayu tarik dianalisis untuk parameter jumlah dan diameter pori dan korelasinya dengan komposisi lignin. Sampel kayu reaksi diambil dari batang pohon mindi (Melia azedarach) yang tumbuh miring. Pembentukan kayu tarik menurunkan jumlah dan diameter pori dan sebagai implikasinya meningkatkan proporsi serat. Jumlah dan diameter pori berkorelasi positif dengan kadar lignin. Nisbah siringil/guaiasil dan erythro/threo struktur β-O-4 berkorelasi negatif dengan jumlah dan diameter pori. Hasil penelitian ini mengkonfirmasi bahwa perubahan proporsi sel penyusun kayu akibat tegangan pertumbuhan merupakan salah satu faktor penting yang berpengaruh terhadap perubahan karakteristik kimia lignin kayu tarik. Distribution of Vessels in Tension Wood and Its Correlation with Lignin CompositionAbstractThe anatomical properties of tension wood were investigated for number and diameter of vessel and its correlation with lignin composition. Reaction wood sample was taken from the leaning stem of mindi (Melia azedarach). The formation of tension wood reduced the number and size of vessel and, consequently, increased the proportion of fiber. Number and diameter of vessels positively correlated with lignin content. However, syringyl/guaiacyl ratio of lignin and erythro/threo ratio of β-O-4 structures were negatively correlated with number and diameter of vessels. It was confirmed that changes in the proportion of wood cell was an importance factor influencing the changes in chemical characteristic of tension wood lignin.
Pengaruh kondisi fumigasi terhadap efektifitas pewarnaan dan keawetan kayu hutan rakyat Istie Sekartining Rahayu; Esti Prihatin
Jurnal Ilmu Pertanian Indonesia Vol. 14 No. 2 (2009): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Indonesian log consumption average in 1999-2004 was about 40 million cubic meter per year. Far above the capacity of natural forest to supply wood demand which was only 6.9 million cubic meter per year and only 5 million cubic meter per year from plantation forest. Now community forest has been managed well based on commercial orientation to fullfill the needs of forest products.  Recently community forest is known as realible wood producer for furniture such as rubber wood (Hevea brasiliensis), Maesopsis (Maesopsis eminii), Jeunjing (Paraserianthes falcataria), Durian (Durio spp.), Jackfriut (Arthocarpus sp). However those woods have low appearance quality (pale colours and ununiform, texture not attractive). Thus they need some treatments to enhance their appearance, one of them by fumigation. The purpose of this researh are to gain optimalize fumigation condition (combination between amonia volume and time of fumigation) to have wood stain that resistance from weathering and to analyze durability of fumigation wood against Cryptotermes sp attack.  The treatments were fumigation by 2, 4, 6 litre of amonia for 1, 2, 3 days.  Those treatments were applied on 5 wood species (mahagony, jackfruit, rambutan, menteng and mindi). The results of this research showed that fumigation treatments have effects only on jackfruit, mahagony, rambutan. They did not have effects on menteng and mindi. Because the difference of tanin content between woods, made every wood had different reaction to fumigation (amonia). Based on comparison of all treatments quantitatively showed the most darkened colour of jackfruit was resulted by fumigation by 4 litre amonia for 3 days, mahagony was fumigation by 6 litre amonia for 2 days and rambutan was fumigation by 4 liter amonia for 2 days.  Weathering resistance resulted all wood species did not resist to weathering or their colour fade away. Wood fumigation durability showed 100 % mortality of Cryptotermes sp (on jackfruit, mahagony and menteng), on the other hand mindi showed 83 % and rambutan 89% mortality of  Cryptotermes sp.
Ultra-Struktur Kayu Tekan Damar (Agathis loranthifolia Salisb.) dalam Hubungannya dengan Sifat Fisis Kayu Ultra Structure of Compression Wood of Agathis (Agathis loranthifolia Salisb.) and Its Relation to Physical Properties I Ketut Nuridja Pandit; Istie Sekartining Rahayu
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 5, No 1 (2007): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (319.611 KB) | DOI: 10.51850/jitkt.v5i1.267

Abstract

Compression-wood is one of the abnormalities phenomena found in softwood’s trunk. This abnormality has not been studied comprehensively yet as most of the research on normal trees. This research objective was to analyze ultra structure of Agathis compression wood cell walls and the relation to its physical properties. Wood samples were taken from compression wood in size of 0.5 cm x 0.5 cm x 3 cm.  Ultra structure of cell walls characteristics were analyzed descriptively by using SEM image, while physical properties studied were green and air dried moisture content, density and specific gravity, and shrinkage. The results showed that the form of tracheid cells were changed cross sectionally; intercellular spaces occurred between round tracheid cells; the third layer of secondary cell wall (S3) of compression wood was not clearly distinct; and the angle orientation of microfibril increased along the longitudinal axis. The ultra structure differences led to different physical properties such as greater moisture content, density as well as shrinkage
Nowadays wood supplies from natural forest are decreasing.  Many efforts had been done to overcome this problem. One of them was by developing plantation forest, however it has not optimized yet because of many problems. Lately wood supplies were fulfilled by community forest woods.  One of them is cinnamon (Cinnamomum spp.). The research objective was to gain information on anatomical, physical, mechanical and chemical properties of C. burmanni Blume and to analyse its utilization based on thes RAHAYU, Istie Sekartining; WAHYUDI, Imam; YOLANDA, Yoki Putra
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 3 No. 1 (2010): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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Abstract

Nowadays wood supplies from natural forest are decreasing.  Many efforts had been done to overcome this problem. One of them was by developing plantation forest, however it has not optimized yet because of many problems. Lately wood supplies were fulfilled by community forest woods.  One of them is cinnamon (Cinnamomum spp.). The research objective was to gain information on anatomical, physical, mechanical and chemical properties of C. burmanni Blume and to analyse its utilization based on these properties. Wood samples used were three logs of 15 years old with 25 cm diameter. It showed that wood texture was fine, between sapwood and heartwood was not distinguished well. Specific gravity was 0.56, while MOE, MOR, and  compressive parallel to grain were 55.731 kg/cm2, 742 kg/cm2, and 392 kg/cm2, respectivelly. Solubility in ethanol benzene was 4.07%, cellulose content  was 48.53%, hemicellulose was 15.71% and lignin was 22.72%. Based on those properties, it could be recommended that C. burmanni wood was suitable enough for furniture, pulp, and light construction purposes.   Keywords :              community forest, Cinnanomum burmanii Blume, wood properties, wood utilization.  
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 itselv Istie SEKARTINING RAHAYU; Zahrial COTO
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 1 No. 1 (2008): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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Abstract

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: 
The aim of this study was to evaluate dynamic modulus of elasticity (MOEdyn) of woods after tested those natural durability. Field tests by grave yard test were applied to prove the natural durability of jackfruit and mangium woods in ground contact. The method of non-destructive testing based on ultrasonic wave propagation was carried out to define ultrasonic velocity than that used for evaluating MOEdyn. The result showed that ultrasonic velocity of jackfruit and mangium woods decreased 3% and Lina KARLINASARI; Ina RITA; Istie Sekartining RAHAYU
Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 1 (2009): Jurnal Ilmu Teknologi Hasil Hutan
Publisher : Departemen Hasil Hutan, IPB

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Abstract

The aim of this study was to evaluate dynamic modulus of elasticity (MOEdyn) of woods after tested those natural durability. Field tests by grave yard test were applied to prove the natural durability of jackfruit and mangium woods in ground contact. The method of non-destructive testing based on ultrasonic wave propagation was carried out to define ultrasonic velocity than that used for evaluating MOEdyn. The result showed that ultrasonic velocity of jackfruit and mangium woods decreased 3% and 0.5%, respectively after field test. There was a significant difference of MOEdyn value between before and after natural durability testings
Pengujian Efikasi Skala Laboratorium Kayu Hasil Fumigasi Terhadap Serangan Rayap Tanah (Coptotermes curvignathus) Imam Wahyudi; Istie Sekartining Rahayu; . Arinana
Jurnal Ilmu Pertanian Indonesia Vol. 17 No. 3 (2012): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Fumigated wood was assumed to retain durability level against wood destroying factors. Due to lack of data, fumigated wood durability against wood destroying factors needs to be investigated, especially toward subterranean termites. The aim of this research was to evaluate fumigated wood durability against subterranean termites attack in laboratory scale (ASTM D 3345-2008). Wood samples used were sengon (Falcataria moluccana), rubberwood (Hevea brasiliensis), and mangium (Acacia mangium). Samples of 2.5 × 2.5 × 0.6 cm were fumigated inside 2 × 1 × 1 m of fumigation chamber using 2, 4, 6, 8, and 10 liters of ammonia solution for 4 days. The samples were then transferred into glass bottle, along with sterile sand and 200 worker and 20 soldier subterranean termites. After 4 weeks, mortality and weight loss percentage were measured. All treatments showed 100% of mortality, while a significant decline in weight loss percentage was varied depends on wood species as well as the volume of ammonia. Therefore, fumigated wood was proven resistant against the attacks of subterranean termites.
Karakteristik dan Sifat-Sifat Dasar Kayu Jati Unggul Umur 4 dan 5 Tahun Asal Jawa Barat Imam Wahyudi; Trisna Priadi; Istie Sekartining Rahayu
Jurnal Ilmu Pertanian Indonesia Vol. 19 No. 1 (2014): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

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Abstract

Anatomical characteristics, fiber morphology, microfibril angle, specific gravity and wood density, dimensional stabilization, modulus of rupture (MOR), modulus of elasticity (MOE), hardness and natural durability of superior teakwood from West Java were studied comprehensively in order to find out their best quality improvement technique. It was showed that quality improvement technique has to be employed since characteristics and properties of the superior teakwood studied are inferior compared to those of the older teakwood. In general wood strength, wood durability, wood stability and wood figure were lower compared to those of the conventional teakwood.
Sifat Dasar Kayu Ganitri (Elaeocarpus sphaericus (Gaertn.) K. Schum.) dari Sukabumi dan Potensi Penggunaannya Esti Prihatini; Akhrudin Maddu; Istie Sekartinging Rahayu; Mersi Kurniati
Jurnal Ilmu Kehutanan Vol 14, No 1 (2020)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1557.925 KB) | DOI: 10.22146/jik.57480

Abstract

Ganitri (Elaeocarpus sphaericus (Gaertn.) K. Schum.) adalah pohon cepat tumbuh yang banyak ditemukan di Sukabumi. Kayu ini tumbuh di hampir semua wilayah Indonesia. Tulisan ini menyajikan hasil pengujian sifat dasar (struktur anatomi, kimia, sifat fisis dan mekanis) kayu ganitri yang diambil dari hutan rakyat di daerah Sukabumi. Tujuan penelitian adalah untuk mengetahui potensi penggunan kayu ganitri berdasarkan sifat dasar dan penggunaan kayu oleh masyarakat sekitar. Hasil penelitian menunjukkan bahwa kayu ganitri memiliki kayu teras berwarna kuning dan kayu gubal berwarna putih. Corak kayu polos dan tekstur halus. Arah serat lurus sampai berpadu, kayu lunak, tidak mengkilap, dan tidak berbau. Berdasarkan nilai dimensi serat dan nilai turunannya, kayu ganitri termasuk ke dalam Kelas Mutu II. Kayu ganitri memiliki kadar holoselulosa dan selulosa yang tinggi (70,70% dan 54,58%), kadar sedang untuk lignin 21,60%, ekstraktif alkohol-benzena 3,47%, dan kadar abu 0,81%. Dengan berat jenis (BJ) kering udara 0,35 kayu ganitri termasuk ke dalam Kelas Kuat IV. Kayu tersebut disarankan untuk digunakan sebagai bahan bangunan konstruksi ringan, perkakas, furnitur, kayu lapis, papan sambung dan produk panel. Basic Properties of Ganitri Wood (Elaeocarpus sphaericus (Gaertn.) K. Schum from Sukabumi and Its Potential UsesAbsractGanitri (Elaeocarpus sphaericus (Gaertn.) K. Schum.) is a fastgrowing tree that is widely found in Sukabumi, West Java. It grows in all part of Indonesia. A research was carried out to investigate basic properties (anatomical, physical, mechanical, and chemical) of ganitri wood from the community forest of Sukabumi. The purpose of this study was to determine the potential use of ganitri wood based on its basic properties and local utilization. The results showed that the color of ganitri sapwood was white , and it was not clearly demarcated from the yellow, with fewer figure patterns. The texture was fine with straight to interlocked grain. The wood was soft, not lustrous, and no special odor. Based on the fibre dimensions and derivative values, the quality of ganitri wood fell in Class II as a raw material for pulp and paper. Ganitri had high holocellulose and cellulose levels (70.70% and 54.58%), moderate level in lignin (21.60%), and it contained 3.47% extractive soluble in alcohol-benzene, and 0.81% ash. Based on its air dry specific gravity (0,35), ganitri wood could be classified into wood Strength Class IV. The potential uses of ganitri are for lightweight construction material, tools, furniture, plywood, connecting boards, and other panel products.