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Jurnal Penelitian Hasil Hutan
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Articles 4 Documents
Search results for , issue " Vol 12, No 5 (1994): Jurnal Penelitian Hasil Hutan" : 4 Documents clear
UJI COBA PENGGUNAAN GAS PANAS DARI TUNGKU GASIFIKASI KA YU KARET UNTUK PENGERINGAN BUI COKLAT Nurhayati, Tjutju
Jurnal Penelitian Hasil Hutan Vol 12, No 5 (1994): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1550.696 KB) | DOI: 10.20886/jphh.1994.12.5.164 -168

Abstract

 Hot gas of rubber wood burning on wood gasifier-combustor with capacity 3 mBTU used for cacao seed  drying at temperature ranged from 68 to 74° C. The moisture content of cacao seed prior to drying was varied from 141.93 to 7.14 %.The trial results revealed that the average of hot gas flow rate was 118.47m3/hour, rubber wood consumed  was 0.33 kg per kg dry cacao seed or 1.03 kg per wet cacao seed, with the moisture content of rubber wood ranged from 11.64 to 14.34 %. The flow rate of drying was 134.63 dry cacao seed per hour and the efficiency of hot gas conversion was 54%. The energy of hot gas consumption was 2.79 MJ per kg cacao seed and the productivity was 94. 67 KJ per kg cacao seed per hour. 
EFFECT OF SUPERCRITICAL C02 EXTRACTION TEMPERATURE ON THE YIELD OF WAXES OF RADIATA PINE (PINUS RADIATA D.DON) NEEDLES* Wiyono, Bambang; Jordan, P J
Jurnal Penelitian Hasil Hutan Vol 12, No 5 (1994): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1681.221 KB) | DOI: 10.20886/jphh.1994.12.5.175-179

Abstract

Teknologi   ekstraksi  superkritikal   fluida  merupakan  teknologi  yang  relatif   baru  yang   saat   ini  sedang   dikembangkan,    terutama dalam  ektraksi   senyawa   kimia.   seperti   minyak  atsiri,   dari produk  alami. Penelitian   ini bertujuan   untuk   mengekstraksi   lilin   dari daun Pinus  radiata D.  Don  dengan  teknologi  eksrtaksi   superkritikal  fluida C02 pada   tekanan   ekstraksi  30 MPa  dan  pada   beberapa tingkat suhu ekstraksi (40, 56 dan  72 °C)  selama 30 menit.   Lilin ditangkap  oleh perangkap  dingin  pertama dengan   kondisi tekanan  sedang 6-7 Mpa dan  12-13  Mpa,  dan 0oC. Sisanya ditangkap  oleh perangkap  dingin kedua pada kondisi  tekanan  sedang 0,1 Mpa  dan suhu  0oC.Hasil  penelitian  menunjukan bahwa peningkatan suhu ekstraksi pada   tekanan sedang 6-7 MPa menyebabkan rendemen  yang dihasilkan menurun, baik yang diperoleh dari perangkap dingin   pertama    maupun kedua.    Pada   tekanan sedang  12-13 MPa, rendemen yang dihasilkan mula-mula turun,   kemudian   naik  pada suhu ekstraksi 72°C,   terutama pada perangkap dingin pertama. Penyebab peningkatan  rendemen  ini adalah setiap habis ekstraksi,   pipa  dan katup dimana  lilin  terperangkap  disitu tidak dibilas dengan  pelarut  khlorofonn  atau  dibilas  dengan   cara  diekstraksi  lagi  dengan   superkitikal fluida  tanpa  sampel   di sel  ekstraksi.   Untuk  menunjang   hasil  penelitian    ini,   lilin hasil   ekstraksi   metode superkritikal fluida perlu dianalisis dengan   metode High  performance liquid  chromatography   (HPLC)
PENGAWETAN TIGA JENIS KAYU SECARA RENDAMAN DINGIN DENGAN BAHAN PENGAWET BORAKS DAN ASAM BORAT Abdurrohim, Sasa
Jurnal Penelitian Hasil Hutan Vol 12, No 5 (1994): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2179.305 KB) | DOI: 10.20886/jphh.1994.12.5.157- 163

Abstract

Wood samples  of three species measuring .3 cm x  3 cm x 3 cm (150 samples for each species) were treated with cold soaking treatment using borax and boric acid preservatives for 1,3,5,  7, and 9 days at the concentrations of 2,3, and 5 percent.The test result of experiment, after taking both retention and penetration  requirements into consideration for wood used under roof without ground contact showed that only  two species,  damar kunyit and pulai, could be satisfactorily treated with Boric Acid under the experimental  conditions,   while other species,  benuang,  couldnt  meet the standard.  Borax preservative  showed  a good result only on one species.  i.e.  pulai.For under roof usage without ground contact, pulai can be consecutively soaked for 9 and 7 days in boric acid solution of 3 and 5 percent, while in borax, for 5 and 3 days soaking  time are 3 and 5 percent. Damar kunyit used under roof without ground contact could be soaked for 7 days in boric acid solution of 5 percent. 
PROGRAM SIMULASI KOMPUTER UNTUK MENINGKATKAN RENDEMEN PENGGERGAJIAN Rachman, Osly
Jurnal Penelitian Hasil Hutan Vol 12, No 5 (1994): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3405.011 KB) | DOI: 10.20886/jphh.1994.12.5.180-193

Abstract

The computer simulation programs for increasing lumber recovery are presented  in this paper.  These programs  were created for sawing logs with live sawing,  half sawing, and semi-quarter  sawing patterns, and convening  the sawn limber into blanks using turbo basic language version  1, 1.  The log model used was a truncated cylinder to represent the real logs.The  best opening  first (BOF) of logs is computed  by entering data of log factors such as diameter  and  length,  and sawing factors such as saw kerf, sawn limber thickness, allowance for sawing thickness, blank width, and allowance for sawing width.For several runs on computer under any circumtances  the program produced nominal lumber and blank recovery ranging 73-76 %  and 83 - 89 %, respectively, the values of shrinkage allowance,  planing allowance and sawing  variation have been  included in nominal lumber recovery.

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