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Jurnal Penelitian Hasil Hutan
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Search results for , issue " Vol 6, No 5 (1989): Jurnal Penelitian Hasil Hutan" : 5 Documents clear
PENGARUH KECANGGIHAN MESIN TERHADAP AKURASI UKURAN KAYU GERGAJIAN Balfas, Jamal
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.1989.6.5.331-333

Abstract

This  study   was  carried  out  at  a sawmill  in  Lampung,   Sumatera.   The sawmill  had  two  unit  of  band-headrigs   with different  type  of  machines,   namely  a conventional    mill  and  a modern   one.   The design of  the modern  mill is more  sophis- ticated   in  characteristics   as  figured   in  Table   1.    Accuracy    of  sawn   timber   was  determined    by  comparison    between actual  size  and  target size  of  the  lumber  thickness.   The  data  were  collected   from  measurement   of  1OO pieces  of  lumber selected  randomly   from  each mill production.The  result  showed   that  the  machine  sophistication    has a significant   effect  on sawn  timber  size accuracy.  The more sophisticated   machine   can  give  more  than  10%    benefit   of  sawn  timber  production    compared   to  the  conventional   one. The level of sawing accuracy  on conventional   mill  is 88.15%,     whereas  the  modern  mill could  reach 98.29%.
KEKUATAN KAYU LAMINA YANG DIBUAT DARI TIGA JENIS KAYU Karnasudirdja, Suparman
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 | Full PDF (6277.409 KB) | DOI: 10.20886/jphh.1989.6.5.281-287

Abstract

The  results  of  strength   test  of  solid  and glue  laminated   timbers  represented   by  Kapur,  Teak  and  Red  Meranti  are reported  in this paper.  The method   used for  the  testing  was the  ASTM  D 143-1970.For  the purpose   of  the  test,  8 x  12 x  400  cm  lumbers  of  the  three species  were divided  into  two groups  being de- signated  respectively  for  test  in solid  and glue  laminated    form.   The  first  group  were tested  for modulus of rupture,  com- pression  parallel  to  the grain and shear strength  under  air dry  condition.  In  bending  tests,  two  methods  of  loading  were applied,  namely  perpendicular   and parallel  to  the  laminae   in case  of glue laminated   timbers,  and along radial or tangential direction  for solid timbers.The  second   group   were  resawn  further   into  0. 9  cm  and   1.  9 cm  thick    timber  strips,  respectioely,   for  small size tests  of  the  glue  laminated  specimens.    The  0.9  cm  thick  strips  which  were air-dried  and   then   glued  with   CIBA  Phenol resorcinol-formal-dehyde     adhesives,  were designated   for  test  on  modulus   of  rupture  and  compression.    The  1.9   cm   thick strips  were divided  further   into  five  batches,   and each of which  were dried respectively  until  25,  20,  15,  10 and  5 percent moisture   content   before   glueing  with  the  above   mentioned   adhesive   into  six  different  combination   of  test pieces  namely Teah-Meranti   (JM),   Teak-Kapur  (JK),  Meranti-Kapur    (MK),  Kapur-kapur   (KK),   Teak-Teak     (JJ) and  meranti-Meranti    (MM).The  results  of  the  tests  are presented   in  Table   1   and  2  for  modulus   of  rupture   and  compression  parallel  to  the grain;  and Tabel 3 and 4 respectively  for  the shear   tests of the six  lamination   combination.
LONGITUDINAL VARIATION OF PHYSICAL AND MECHANICAL PROPERTIES OF ARENGA (ARENGA PINNATA) WOOD Kamasudirdja, S; Sarwono, E
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 | Full PDF (7749.761 KB) | DOI: 10.20886/jphh.1989.6.5.304-313

Abstract

Tulisan  ini menyajikan hasil penelitian  variasi kerapatan  arah longitudinal  dan beberapa sifat  mekanis  kayu  aren yang diambil  dari Jasinga,  Jawa Barat. Beberapa  sifat yang  disebut   belakangan termasuk  di dalamnya  adalah keteguhan  lentur, keteguhan tekan,  keteguhan  pukul  radial/tangensial  dan kekerasan  ujung/sisi permukaannya.Analisis  statistik   menggunakan  prosedur  analisa   tersarang,  menunjukkan  suatu  pengaruh   beda nyata  tempat  kedudukan  di atas tanah  terhadap  kekuatannya    pada  kadar air kayu  kering  udara.   Walaupun  demikian pengaruh  serupa  tidak terlihat jelas pada kondisi  kadar air kayu  basah.
KERENTANAN EMPAT JENIS KAYU RIMBA TERHADAP SERANGAN JAMUR PEWARNA Martono, Dominicus
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 | Full PDF (3487.308 KB) | DOI: 10.20886/jphh.1989.6.5.314-317

Abstract

This study   evaluates  the  susceptibility   of  ramin (Gonystilus bancanus Kurz),  jelutung    (Dyera  sp),   mentibu   (Dacty- locladus  stenostachys  Oliv)  and  meranti   batu  (Shorea   sp)  against  sapstain.   The  material  used  consists  of  debarked   and unbarked   fresh  logs.  The  tested  logs  were  tried  at  swamp  forest   in  West  Kalimantan   in November   -   December   1978.The  data  were analysed  by  Nested   Classification  method.   The  degree  of  damage  was transformed   into  arcsin √%Inspections   were conducted   biweekly   for one month  after  treatment.The  result  showed  that  the  average degree  of  damage due    to  the sapstain  were  not  different  among  the four  wood species.  The effect  of debarking  treatment   increases the log susceptibility. There is no different of staining degree among  the log cutting  from  the  base, middle  and top of  the trees.
ANATOMI BATANG AREN (ARENGA PINNATA MERR.) Mandang, Y I; Sudarna, Nenny S
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 | Full PDF (4741.35 KB) | DOI: 10.20886/jphh.1989.6.5.334-339

Abstract

The  anatomical   features  of  aren stem  in relation  to  its utilization   were  studied   by  taking  samples  from  Bogor  Re- gency,   West Java.   The  mature  stem  has 8 to 10 m of clear bole with  30 to 43 cm  in diameter.  The hard pheripheral  region of  the stem  is only  0.5 to 5.2  cm in thickness   or 4 to 20 percent  of the .stem  volume.The pheripheral  region of  the stem  consists  largerly of fibrouascular  bundles  while  the central portion   consists  mainly bf parenchyma   tissues.  The frequency   of  vascular bundles  at pheripheral  region may  reach 139 bundle/sq.  cm  then gradually decreased  to 10 bundles/sq.   cm at the center.The  fiber  dimension   vary along and  across the  stem:   length  1618  to 2712  microns,  diameter.28   to 52 microns,  wallthickness  5 to 24 microns.   The Runhell  ratio varies from  0. 56 to 13.33.

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