Jamal Balfas
Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan Jl. Gunung Batu 5, Bogor. Telp. 0251-8633378

Published : 56 Documents
Articles

A NEW APPROACH TO OIL PALM WOOD UTILIZATION FOR WOODWORKING PRODUCTION (Part 2: Wood Modification with Organic Resin) Balfas, Jamal
Indonesian Journal of Forestry Research Vol 5, No 2 (2008): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

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Abstract

IMPREGNASI EKSTRAK JATI DAN RESIN PADA KAYU JATI CEPAT TUMBUH DAN KARET Basri, Efrida; Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 32, No 4 (2014): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

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Penelitian sebelumnya menunjukkan karakteristik fisis, mekanis dan keawetan kayu jati cepat tumbuh (JCT) relatif lebih rendah dibanding kayu jati tradisional.  Berdasarkan hal tersebut, perlakuan modifikasi kayu dapat dilakukan dengan perlakuan tertentu untuk meningkatkan kualitas kayunya. Penelitian ini bertujuan menyempurnakan karakteristik kayu JCT dan karet dengan perlakuan impregnasi ekstrak jati dan resin hingga mendekati atau setara dengan karakteristik kayu jati tradisional.  Dalam penelitian ini dilakukan ekstraksi serbuk kayu jati tradisional dengan pelarut metanol.  Larutan ekstrak tersebut kemudian diimpregnasi ke dalam struktur kayu JCT dan karet dengan beragam konsentrasi menurut penambahan resin organik.  Resin yang digunakan sebagai campuran dalam penelitian ini adalah sirlak dan damar, masing-masing dengan konsentrasi berat 4, 6 dan 8% dari volume ekstrak.  Hasil penelitian menunjukkan perlakuan impregnasi larutan ekstrak jati terhadap kayu JCT dan karet mampu meningkatkan stabilitas dimensi kedua jenis kayu tersebut dengan nilai ASE lebih dari 50%, hingga setara dengan stabilitas jati tradisional. Penambahan resin sirlak maupun damar ke dalam larutan ekstrak jati secara nyata dapat lebih menyempurnakan sifat stabilitas dimensi kayu JCT dan karet secara proporsional menurut konsentrasi resin. 
PENETAPAN UKURAN SASARAN SEBAGAI USAHA PENINGKATAN EFISIENSI PROSES PENGGERGAJIAN Rachman, Osly; Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 6, No 4 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1989.6.4.215-219

Abstract

Two units of sawmill in Lampung (Sumatera) and three units in West-Java have been visited for the purpose of this study. Determination of target size on each sawmill was firstly done by collecting data from thickness measurements of 100 board samples. The data was then calculated using the most common formulas used for determining the lumber target size.The result of the study revealed that actual size produced by two sawmills surveyed were higher than target size, ranging from 1.08 to 1.58 mm. The actual size from three other sawmills were lower than target size, ranging from 0.26 to 2.18 mm. The sawmill A has apparently the best sawing capability. This was indicated by the smallest thickness range either within or between board i.e. 0.89 mm and 0. 79 mm. Meanwhile, its total sawing variation was smallest i.e. 0.49 mm.The result of this study was an indication that there is a need for improving the efficiency of sawing process through the application of target size determination.
PENENTUAN PENUMPULAN PISAU PADA PERMUKAAN KAYU Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 12, No 2 (1994): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1994.12.2.109-113

Abstract

The wear of wood cutting tools is, generally, the process which makes a usable tool unfit for continued use. The replacement of the worn cutter either by reconditioning or substitution of a new one represents a necessary cost which can be minimized by controlling tool wear. Numerous studies have been conducted through direct observations on the cutting edge using a variety of photographic methods. Such observations are quite complicated and can hardly be introduced to industrial practices. This study is aimed to explore a possibility of determining cutting tool wear indirectly through the work piece observation. It is based on assumption that knife blunting has a direct bearing on the quality of the finished product, i.e., changing the geometry of cutting marks on the wood surface.Boards of two wood species, rasamala and mangium, were seasoned to air-dry condition and planed using new sharp knives at one feed speed of 30 m/min. Observations were carried out sequentially at 5 planing distances, i.e., 10, 20, 40, 80 and 160 m. Cutting marks geometry on the wood surface was distinguished by rubbing the surface gently with a carbon paper. Measurements of cutting marks and the width of cutting peak were undertaken using a digital calliper. Results showed that values of cutting marks and width of cutting peaks markedly increased with increasing planing distances. Blunting process was significantly affected by wood species. Knives used for planing rasamala boards blunted quicker than those used for mangium. These, to some extend, revealed a possible use of cutting marks structure on wood surface for determining the wear of cutting edge.
SIFAT BALOK KOMPOSIT KOMBINASI BAMBU DAN KAYU Abdurachman, Abdurachman; Hadjib, Nurwati; Jasni, Jasni; Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 33, No 2 (2015): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Litbang Keteknikan Kehutanan dan Pengolahan Hasil Hutan

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PENANGGULANGAN MASALAH SERAT BERBULU PADA KAYU LABU (Endospermum spp.) SEBAGAI BAHAN BAKU PENSIL Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 29, No 1 (2011): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2011.29.1.78-85

Abstract

Dalam beberapa tahun terakhir kayu labu (Endospermum spp.) telah digunakan sebagai bahan baku alternatif oleh industri pensil di Indonesia. Namun terdapat beberapa keluhan teknis dalam penggunaannya sebagai bahan baku pensil (pencil slat). Salah satu keluhan utama yang dijumpai dalam proses produksi jenis ini adalah kecenderungan munculnya serat berbulu (fuzzy grain) pada permukaan pensil kayu labu. Dalam penelitian ini dilakukan upaya penanggulangan serat berbulu dengan perlakuan rendaman bahan baku pensil pada larutan resin JRP1 dengan beragam konsentrasi dan waktu rendaman. Konsentrasi resin terdiri dari dua taraf, yaitu 5 dan 10%, sedangkan waktu rendaman bervariasi dari 5, 10, 30 dan 60 menit. Hasil penelitian menunjukkan bahwa perlakuan rendaman resin JRP1 mampu mengatasii masalah serat berbulu pada permukaan pensil, sekalipun menggunakan konsentrasi resin terendah dan waktu rendaman paling singkat. Perlakuan ini menyebabkan penambahan berat pada pensil slat sebesar 2 sampai 4% tergantung pada taraf konsentrasi resin dan lama waktu rendaman. Deposisi resin pada pensil slat menyebabkan kenaikan biaya sekitar Rp 60 per pensil slat.
Struktur Anatomi dan Kualitas Serat Kayu dan Akar Gantung Beringin (Ficus benjamina Linn.) Krisdianto, .; Balfas, Jamal
Jurnal Ilmu Pertanian Indonesia Vol 21, No 1 (2016): Jurnal Ilmu Pertanian Indonesia
Publisher : Institut Pertanian Bogor

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.18343/jipi.21.1.13

Abstract

Beringin (Ficus benjamina Linn.) is one of typical fast growing tree species which are commonly found in Indonesia. The trees grow with hanging roots which grow larger and often can merged with the main stem, then its timber is not optimally utilized. This paper studies the anatomical structure and fiber quality of main stem and large, medium, and small diameter of hanging roots of beringin (Ficus benjamina Linn.) tree. Anatomical structure was observed macroscopically and microscopically, while fiber dimensions were measured from macerated samples. The results show that the anatomical structure pattern of the roots is similar with those of main stem, however the quantity and dimension of anatomical components of hanging roots are smaller and shorter than components of main stem. Likewise, the fiber dimensions of roots are shorter and thinner than those taken from the main stem. Based on fiber dimensions and its derivative value, beringin wood fibers are classified into class quality II for pulp and paper. The creamy white color with white streaky figure of beringin wood from main stem is recommended for indoor decoration products such as wooden venetian blind, while the small roots are recommended for strap or webbing material crafts.
KARAKTERISTIK KAYU KELAPA SAWIT TUA Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 27, No 3 (2009): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2009.27.3.223 - 234

Abstract

Kayu kelapa sawit yang berasal dari kegiatan penjarangan diketahui memiliki karakteristik yang rendah dibandingkan dengan kayu komersil.  Namun demikian tidak ada informasi yang menguraikan karakteristik kayu sawit yang berasal dari pohon tua. Penelitian ini mengevaluasi karakteristik kayu sawit yang berasal dari tanaman usia tua dan usia peremajaan.   Semua pohon contoh diambil dari blok perkebunan sawit yang sama di wilayah Jasinga, Jawa Barat. Hasil penelitian menunjukkan bahwa pohon sawit tua memiliki batang  dengan ukuran diameter lebih kecil, lebih tinggi dan volume yang sama dengan pohon sawit peremajaan.   Kayu sawit tua memiliki jumlah jaringan vaskular lebih banyak dibandingkan dengan jaringan tersebut pada kayu sawit peremajaan.  Perbedaan struktur menurut umur pohon pada kayu sawit menyebabkan kayu sawit tua lebih baik secara fisis, mekanis maupun pemesinan daripada kayu sawit peremajaan.  Kayu sawit tua memiliki kesetaraan beberapa sifat teknis dengan kayu kelapa dan kayu komersil lainnya.
NEW APPROACH TO OIL PALM WOOD UTILIZATION FOR WOODWORKING PRODUCTION Part 1: Basic Properties Balfas, Jamal
Indonesian Journal of Forestry Research Vol 3, No 1 (2006): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2006.3.1.55-65

Abstract

An explosive development in oil palm plantations in the country has produced a consequence in the generation of  plantation wastes. The  disposal of these wastes  has created  an  enormous environmental problem that some practical solution to their economic utilization has to  be sought.  A series of experiments have been accomplished to observe the possibility of converting the oil palm stem into valuable woodworking products. The  first stage of  this effort was determining basic characteristics of oil palm wood.  Results in general showed that the wood has a great characteristic variation across and along the stem, which may develop problems in its utilization. Characteristics of this wood also vary according to species variety.  Quality degradations of oil palm wood were mostly happened during drying process; hence, modifications to upgrade quality should be undertaken before or within the drying process.
A NEW APPROACH TO OIL PALM WOOD UTILIZATION FOR WOODWORKING PRODUCTION (Part 2: Wood Modification with Organic Resin) Balfas, Jamal
Indonesian Journal of Forestry Research Vol 5, No 2 (2008): Journal of Forestry Research
Publisher : Secretariat of Forestry Research and Development Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/ijfr.2008.5.2.115-124

Abstract