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SIFAT PEMESINAN JENIS KAYU JAWA BARAT Osly Rachman; Jamal Balfas
Jurnal Penelitian Hasil Hutan Vol 4, No 3 (1987): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

This paper presents the result of test on machining properties of 28 wood species from Bogor and Sukabumi, West Java. The test method used was the modified ASTM D-1666 described in the Forest Products Research Institut Report No. 160 (1982). The samples (25 pieces/species) were dried to equilibrium moisture content condition (15 to 18%). The machining properties investigated were planning, shaping, boring, mortising, turning and sanding.The species that have good or very good machining properties are kobari, pasang jambe, pasang beureum, mahoni daun lebar, pentadesma, cloropora, eucalyptus, meranti batu, pinus I, mahoni, mahagoni and pinus III. Species such as kelumpang, entorolobium and cecropia are consistenlly poorer. The other species are good in some properties and fair or poor in others.

PENGUPASAN DAN PEMOLISAN ROTAN DALAM KEADAAN BASAH DAN KERING Efrida Basri; Osly Rachman; Achmad Supriadi
Jurnal Penelitian Hasil Hutan Vol 15, No 8 (1998): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1998.15.8.475-487

Pengupasan dan pemolisan rotan berdiameter besar selama ini dilakukan pada keadaan kering. Yang menjadi permasalahan di sini adalah untuk mencapai keadaan kering, waktu pengeringan yang diperlukan sangat lama yakni bisa satu bulan atau lebih untuk mencapai kadar air ± 16%. Keadaan yang demikian tentu tidak menguntungkan karena selain menghambat proses produksi, juga keawetan rotan menjadi turun.Penelitian ini dilakukan dengan tujuan memperoleh beberapa faktor konversi dalam pengupasan dan pemolisan yang dilakukan pada rotan dalam keadaan basah dan kering. Sasarannya adalah untuk mengetahui apakah pengupasan dan pemolisan rotan pada keadaan kering dapat diganti dengan pada keadaan basah.Bahan yang digunakan dalam penelitian ini adalah tiga jenis rolan berdiameter besar, yaitu manau (Calamus manan Miq.), seuti (Calamus ornatus BL.), dan nunggal (Calamus ornatus BL.) yang masing-masing dikupas dan dipolis dalam keadaan basah (KA. 70-80%) dan kering (KA. 15 - 18%). Faktor yang diamati pada saat pengupasan dan pemolisan adalah pengurangan diameter, rendemen, cacat serat berbulu dan serat patah, cacat warna, dan produktivitasnya.Pengupasan dan pemolisan rotan dalam keadaan basah menghasilkan rendemen lebih rendah serta cacat serat berbulu dan serat patah lebih tinggi, namun pengurangan diameter dan produktivitas sama dengan rotan yang dikupas dan dipolis dalam keadaan kering.Mengacu kepada klasifikasi pemesinan, pengupasan dan pemolisan rotan dalam keadaan basah menghasilkan rotan dengan mutu baik untuk jenis manau dan nunggal, dan mutu sedang untuk jenis seuti. Sedangkan, apabila ketiga jenis rotan tersebut dikupas dan dipolis dalam keadaan kering mutunya menjadi sangat baik.Mengingat alat pengupasan dan pemolisan rotan yang ada sekarang hanya untuk rotan kering, maka untuk meningkatkan mutu rotan kupas dan polis basah perlu merekayasa kedua alat tersebut.

PENGARUH PENGERASAN MATA GERGAJI DAN POLA PENGGERGAJIAN TERBADAP. KARAKTERISTIK PENGGERGAJIAN KAYU SENGON (Paraserianthes falcataria) Osly Rachman
Jurnal Penelitian Hasil Hutan Vol 9, No 4 (1991): 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.1991.9.4.163-169

This paper deals with the study of charaetmstlc and sawing recovery of sengon (Peraserianthes falcataria). The materials used in this study consiat of 12c logs with 200 cm long and diameter ranging from 35,5 -36,5 cm. Three types. of sawtooth edge profile. were prepared to saw the logs, i.e. full stellite tipped, alternate-one stellits tipped and alternate –twostellitetipped. the power consumption and feed aped produced by each type of sawtooth were observed and analysed. in the study of sawn timber production two sawing patterns were applied.the parameters investigsted compriss recovery, productivity, board composition and visual defect,results of the study revsal that saw blade with alternate two steliite tipped consumes the lowest power and its feeding speed is the highest. in addition the semi quarter sawing yields recouery 4.5 % higher than live sawing pattern.meanwhile.the sawing productivity between two sawing patterns is not significantly different. the live sawing pattern produces 61 % boards of 15 and 17,5 cm wide; whereas semi quarter sawing produces 42% boards of 10 and 12,5cm. wide. the main defects of boards are knots,splits and shakes.

KARAKTERISTIK PENGGERGAJIAN DAN PEMESINAN KAYU AREN (ARENGA PINNATA) Osly Rachman; Dede Rohadi; Jamal Balfas
Jurnal Penelitian Hasil Hutan Vol 6, No 3 (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.1989.6.3.145-151

This paper discuses the results of study on the sawing and machining characteristics of aren wood (Arenga pinnata). The material used in this study consisted of 26 logs with diameter ranging from 23 cm to 42 cm. These logs were sawn using two cutting patterns, namely live sawing and round sawing. The parameters observed in the sawing procees comprised recovery, productivity and power consumption. .The result of statistical analysis reveals non significant differences of the effect of the two cutting patterns on sawing recovery and sawing productivity. On the other hand, the location of bolt within the stem does not seem to have significant effect on power consumption. The average values of recovery, sawing productivity and power consumption of Aren stem are respectively 13,48%, 6,09 m3/hour and 64,92 watt sec./cm2.The machining characteristic of aren wood was tested in accordance with the modified ASTM D- 1666 (64).The material for the test consisted of 25 samples for each machining property tested (planing, shaping, turning, boring and sanding). The result shows that aren wood has good to very good machining characteristic especially in planing, shaping, boring and sanding.

SIFAT PEMESINAN EMPAT JENIS KAYU KURANG DIKENAL DAN HUBUNGANNYA DENGAN BERAT JENIS SERTA UKURAN PORI Achmad Supriadi; Osly Rachman
Jurnal Penelitian Hasil Hutan Vol 20, No 1 (2002): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2002.20.1.70-85

The machining properties of four lesser known wood species from natural forest in Kalimantan has been investigated. The wood species were gading (Koilodepes sp.), penjalin (Drypetes sp.), arang (Diospyros macrophylla B.) and sibau (Blumeodendron kurzii I.I Sm) with their specific gravities, i.e. 0.83, 0.81, 0.55, and 0.56, respectively. Further, assessment was conducted on the relation between wood characteristics (i.e. specificgravity and vessel diameters) and the possible occurrence of defect due to machining. The machining work included planning, shaping, boring, turning and sanding.The results revealed that machining properties were significantly affected by wood specific and vessel diameter. The higher the specific gravity and the smaller the pore diameter, the less defect that resulted from wood machining. As such, the machining quality of gading and penjalin woods was regarded as very good. Meanwhile, the machining qualities of arang and sibau woods as good to very good. Therefore, to infer, wood with higher specific gravity tends to improve machining properties. Likewise, wood with larger vessel diameter will downgrade the machining properties.

PERBAIKAN TEKNIK PELENGKUNGAN ROTAN MELALUI PERENDAMAN DENGAN LARUTAN DIMETIL SULFOKSIDA Osly Rachman; Suhadi Hardjo; Meri Suwirman
Jurnal Penelitian Hasil Hutan Vol 15, No 4 (1997): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.1997.15.4.299-311

Kayu dapat dilunakkan dengan berbagai macam bahan kimia, satu di antaranya adalah larutan dimetil sulfoksida (DMSO). Oleh karena rotan mengandung struktur kimia yang sama dengan kayu maka akan diselidiki kemungkinan pemanfaatan bahan ini untuk pelengkungan rotan. Tujuan penelitian ini adalah untuk mempelajari pengaruh larutan DMSO pada pelunakan agar diperoleh teknik pelengkungan rotan yang lebih baik. Untuk maksud tersebut, 3 jenis rotan direndam dalam 5 tingkat konsentrasi DMSO lalu diamati sifat pelengkungannya.Pengamatan terhadap kerapatan dan penyebaran ikatan pembuluh yang paling tinggi pada rotan batang menunjukkan bahwa rotan ini perlu direndam dalam larutan 15 persen DMSO agar dapat dilengkungkan dengan mudah tanpa menimbulkan cacat. Sebaliknya, rotan minong memerlukan perendaman pada larutan 5 persen DMSO. Kerusakan pada serat rotan sebagai akibat pelengkungan tanpa perendaman dalam DMSO sangat jelas terlihat pada rotan minong dan batang.Peningkatan konsentrasi larutan cenderung meningkatkan kemudahan dalam pelengkungan, mengurangi kerusakan fists dan tidak mempengaruhi kilap rotan. Akan tetapi, kenaikan konsentrasi cenderung meningkatkan mulur dan pengerutan volume serta menurunkan MOE dan rasio elesto-plastisitas rotan.

PENGARUH PENGERASAN MATA GERGAJI DAN POLA PENGGERGAJIAN TERHADAP KARAKTERISTIK PENGGERGAJIAN KAYU KARET Osly Rachman
Jurnal Penelitian Hasil Hutan Vol 6, No 5 (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.1989.6.5.318-328

This article presents study result on sawing characteristics of rubberwood (Havea brasiliensis Muell. Arg.) subjected to different cutting edge hardness and sawing pattern. The material used in study comprised 40 logs with length 1.30 m and diameter ranging from 13. 75 to 26.00 cm. Half of these logs were sawn with full stellite cutting edge and live sawing pattern. The rest were sawn with alternate stellite tiped cutting edge and half sawing pattern. The parameters studied in sawing process consisted of power consumption, feeding rate, recovery, productivity and the relationship between log diameter and log taper with recovery.The result of statistical analysis shows that sawblade with alternate stellite tiped consums less power compared with full stellite tiped, Meanwhile cutting edge hardness has no significant effect on feeding rate. The result also indicates that live sawing and half sawing pattern yield recovery as much as 35.9% and 40.9% respectively which was significantly dif- ferent each others. Finally, sawing productivity is not significantly affected by sawing pattern applied.

PENGARUH PENGERASAN MATA GERGAJI TERHADAP BEBERAPA SIFAT PENGGERGAJIAN Osly Rachman; Jamal Balfas
Jurnal Penelitian Hasil Hutan Vol 5, No 5 (1988): 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.1988.5.5.279-286

Fifteen mahogany and six agathis logs in fresh cut condition were sawn into boards by a band saw machine. Each wood species was sawn using three saw blades with different cutting edge hardness i.e. hand swaging, alternate stellite . tipping and full stellite tipping. Sawing properties recorded include power consumption, cutting rate and sawing productivity for each wood species and cutting edge hardness.The results of study showed that wood species had no significant difference in terms of power consumption and cutting rate. Meanwhile, sawing productivity of agathis was higher than mahogany.Furthermore, the cutting edge hardnes had significant effect on sawing properties. It is found that the saw blade with alternate stellite tipping reduced power consumption, and increased the cutting rate and productivity.

SAFAT PEMESINAN 10 JENIS KAYU DARI DAERAH SULAWESI UTARA Sri Rulliaty; osly rachman
Jurnal Penelitian Hasil Hutan Vol 9, No 2 (1991): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

machining properties of ten wood species from north Sulawesi was studied. the sampie materiawas tested using ASTM D-1666-64, that was modified to forest products researeh institute report No. 160 (1982). firatiy,the;samples (25 pieoes/species) were dried to an equilibrium moisture content condition (15 or 18 % of MC). the machine-ing properties examined were paining, shaping, boring,turning and the percentage wood defect recorded. the result shows that, five wood species has fair to very good machining properties i.e.Dysoxylum sp. elmerillia ovalis, lophopetalum javenicum,pangium edule and serianthes minahassae.the remainders has good to very good machine-ing properties, whereas three wood secies i.e. aglaia versteghii.lapiacea subintegerrima and neonaudes sp. better than others.

PRODUKTIVITAS DAN BIAYA PRODUKSI SERPIH KAYU MENGGUNAKAN MESIN SERPIH MUDAH DIPINDAHKAN (SMD): Studi Kasus di BKPH Parungpanjang, Bogor Achmad Supriadi; Osly Rachman; M I Iskandar
Jurnal Penelitian Hasil Hutan Vol 24, No 2 (2006): 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.2006.24.2.103-115

Hasil pemanenan kayu di areal hutan baik hutan alam maupun hutan tanaman masih menyisakan potongan-potongan kayu kecil. Potongan kayu yang biasa disebut sebagai limbah pemanenan pada umumnya ditinggalkan di hutan dan sebagian yang dianggap masih laik dijual kepada penduduk sekitar hutan untuk dimanfaatkan sebagai kayu bakar atau bahan baku energi lainnyaDalam rangka meningkatkan pemanfaatan limbah kayu dari hasil pemanenan hutan tanaman, telah dilakukan penelitian pengolahan limbah kayu jenis mangium (Accacia mangium) di areal hutan tanaman di BKPH Parungpanjang, Bogor. Hasil penelitian menunjukkan bahwa faktor konversi rarta- rata limbah pemanenan untuk bahan baku serpih (chip) adalah 1 sm = 0,4791 m3 = 0,257 ton. Rendemen serpih sebelum disaring dan setelah disaring masing-masing adalah 97% dan 53%. Produktivitas penyerpihan adalah 1,6 ton/hari. Investasi pendirian satu unit pengolahan serpih kayu sebesar Rp 38.000.000. Biaya produksi per tahun sebesar Rp 156.109.113 dan harga pokok produksi serpih sebesar Rp 325.227 per ton serpih. Dengan harga jual serpih Rp 360.000 per ton, dapat diperoleh laba kotor dan laba bersih rata-rata per tahun masing-masing sebesar Rp 16.691.040 dan Rp 14.187.784.

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