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Articles 5 Documents
Search results for , issue "Vol 13, No 1 (1995): Jurnal Penelitian Hasil Hutan" : 5 Documents clear
KESESUAIAN ALAT DAN MESIN UNTUK PENGUSAHAAN HUTAN TANAMAN INDUSTRI Sutopo, Sri; Tinambunan, Djaban
Jurnal Penelitian Hasil Hutan Vol 13, No 1 (1995): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4879.993 KB) | DOI: 10.20886/jphh.1995.13.1.27-36

Abstract

Several short  investigations   have  been conducted   lo find the suitability  of equipment and machine   used in foreste  estate  operations.   Original  condition  of  land,  soil cultivation practices, and the productivity  of various  equipment   were also collected.The areas  used  for linber   estate  are  usually   alang-alang  grassland  with  the alang-alang densitv  of around  two million  stems/ha,   the average slope of  8%,   consited  of red yellow to red brown podsolik soils. the soil is plowed  twice hy  using  disc plow of 70 cm diameter  with the plowing  depth  of  20-30 cm.   and then harrowed  by using  disc  harrow of 46 cm diameter  with the harrowing  depth  of  15-20  cm.The  efective  power  used for plowing  is around  25 HP and  for  harrowing  is  around 19 HP. Therefore  the engine power  required  (with  50%  efficiency)  is around 50 HP.   For harrowing with  this level of power,   the  harrow  can  be  extended  up  10   4.8  m  wide  to  increase power efficiency,Felling productivities  by using  chainsaw and feller-buncher    are  7.096  and  7. 708 m3/hour, respectivelv,   The  difference  between  these  two  figures   is  not   significant.    While the skidding productivities   by  using  tractor   (140 HP)  and feller-buncher   are  4.929  and  5.140  m3/hour, respectively,   The  difference between this two figures  is highly  significant.Tge  relationship  between  the  power   of  tractor   and  productivity   is  linear  with  higher productivity   when the power  is larger.   Other  result shows that the tractor  used   are mostly too large and,  therefore,  need the  modification  of plow  and harrow combinations.
PEMBUATAN ARANG KAYU KARET (Hevea brasilliensis) PADA TUNGKU KUBAH MODEL S-93 Nurhayati, Tjutju
Jurnal Penelitian Hasil Hutan Vol 13, No 1 (1995): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4390.068 KB) | DOI: 10.20886/jphh.1995.13.1.37-44

Abstract

Dome kiln of S-93 model with 1.40 m3 capacity was built for charcoal production of rubber wood (Hevea brasilliensis). Two clones of rubber wood used as raw materials were AVROS 2037 and GT-Twhich were 15 and 25 years old, respectively.Charcoal yield, conversion efficiency from wood 10 charcoal, rate of production and quality between AVROS and GT-T were not significant. the percentage of yield was 26.9 % , efficiency was 39.2 % and rate of production was 1.6 kg/hour. the quality of charcoal showed that volatile melter content was 17.43 %, fixed carbon 78.64 %, ash content 3.92 % and catoriffic value 6582 kcal/kg.
ANALISIS KIMIA DAN DESTILASI KERING KAYU KARET Komarayati, Sri; Setiawan, Dadang; Nurhayati, Tjutju
Jurnal Penelitian Hasil Hutan Vol 13, No 1 (1995): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3900.923 KB) | DOI: 10.20886/jphh.1995.13.1.1-8

Abstract

This paper  deals with chemical  and charcoal properties  of rubberwood.  The analysis of chemical  propertis comprises of  the determination   of cellulose, holocellulose,   lignin, pentosan, moisture  content,    ash  content,  silica  content,  solubility  in  cold  water,    hot  water,   sodium hydroxide  1  percent  and ethanol-benzene    (1 : 2). The  analysis of charcoal property comprises of charcoal,  tar,  pyroligneous  liquor,   calorific value,  volatile matter and fixed carbon.The result showed  that cellulose  content   48.38   %  -  50.26  %  ;  holocellulose 59.68   %  -60.17    %  ;  lignin 31.33  %  -  33.49  %  ;  pentosan  15.98   %  -  16.43   %  ;  moisture   content 7.34  -9. 98 %  ; ash 0. 64 - 0. 71  % ; silica 0. 57 %  - 0. 60 %.  Solubility in cold water 2. 39 %  - 4.48 %;  in hot water  3.33   %   - 5.93   %  ;  in alcohol-benzene     (1  :  2)  2.35  %   - 2.37    %  and in one percent sodium hydroxide 18. 87 %  - 20. 72 %.Based on chemical analysis,  especially  the cellulose and pentosan  content,   rubberwood is suitable as raw material forpulp and paper,  rayon andfiberwood.Chemical analysis of charcoal indicated that charcoal yield variedfrom 28.16  %  - 29. 77 %  ;  tar   6.86  %  -  7.4666   %  ; pyroligneous   liquor  87.50   -  103.23   %  ;  calorific value  7114.68  cal/gr -7166. 77 cal/gr .fixed carbon 73.82   %  -  78.05 %  and volatile mailer 20.45 % - 23. 61 %. Proximate  analysis  of charcoal  obtained from this  experiments   revealed that   the   quality are suitable for commercial charcoal, metallurgy charcoal and as raw malerial of activated charcoal.
PENGARUH PEMBUANGAN BANIR DALAM PENEBANGAN POHON TERHADAP EFISIENSI PEMUNGUTAN KAYU (Study kasus di suatu perusahaan hutan di Kalimantan Barat) Suhartana, Sona; Idris, Maman Mansyur
Jurnal Penelitian Hasil Hutan Vol 13, No 1 (1995): 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.1995.13.1.19-26

Abstract

This paper presents  the results  of the study  of  the  impact of buttress cutting in tree felling on harvestring efficiency.  The case study was carried  out in PT Kurnia   Kapuas Plywood in West Kalimantan in  1994.  771e aim of the  study is to know the influence of buttress cutting on wood haversting efficiency.the  data were analysed by using  the I-test.the result of study shows that average of wood harvesting efficiency by cullting buttress is 68.1 % and without cutting buttress is 66.7 %
KETEGUHAN REKAT RESORSINOL FORMALDEHIDA PADA KAYU YANG DIA WETKAN DENGAN CELCURE Balfas, Jamal
Jurnal Penelitian Hasil Hutan Vol 13, No 1 (1995): 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.1995.13.1.9-18

Abstract

Production  of laminated  structural  timbers   suitable  for use under severe  conditions  dates back to the development   of resorcinol and phenol-resorcinol   adhesives.    These adhesives  could provide  highly  durable  bonds  with  untreated    wood.     Because  preservative  treatment  of the - wood is commonly  required,   it  became necessary   to  investigate  the effect of the treatment on glue bond strength.This  study  examined  the  shear  strength   of resorcinol formaldehyde on the untreated  and cetcure  treated   timbers.    Additionally,   a mechanical and a chemical surface  activation treat- ments   were   imposed  lo  the  system  prior  lo  gluing.    Species   included for  the  study  were: jeungjing   (Paraserianthes    falcataria   (L.)  Nielsen,   adinandra  (Adinandra brasii  Kobuski) and pala burung (Horsfieldia sylvestris Warrb.).  Defect-free airdried wood slicks measuring  50 mm (radial) x 50 mm (tangential) x 500 mm (longitudinal)  were divided into  two groups,   of which one  group   was celcure-treated    using  an  empty-cell process  and  the  other  was remained  as control.  Each  slick   was  then    cut  into  billets  for  adhesive   lamination.    Surface  activation treatments   were made mechanically by sanding  wood surface with an 80-grit  abrasive  paper, or chemically by smearing wood surface with  IM solution of NaOH approximately 24 h before  gluing.  Resorcinol formaldehyde  was applied  to each surface  at a spread rate of  120  mg/cm2.  Panels  were clamped  at  12   kg/cm2  for  7 h as recommended  by the   adhesive  manufacturer. Each panel  was  cut   into four  shear   specimens,    of  which  two specimens  were  tested   in dry condition   and the remaining  after  24 h immersion  in water at room temperature.    Strength  loss  due to wetting was also determined.Results  showed  that bond strength  of resorcinol formaldehyde varied according  to wood species.    Jeungjing had a weaker bond strength  than adinandra and pala burung.   Preservative treatment  had  no  deteriorating  effects on dry  shear  strength,   but it did  reduce  the wet  shear strength  of  wood laminates. The  application  of surface activation treatments  was more effective on the higher extractive  contained species   (adinandra  and pala  burung) and the  unpreserved laminates.    Surface mechanical  treatment  showed a better improvement on bond strength  than the chemical   treatment.  Jeungjing   experienced  a higher strength  loss during  immersion  than

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