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Jurnal Penelitian Hasil Hutan
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Search results for , issue " Vol 10, No 3 (1992): Jurnal Penelitian Hasil Hutan" : 3 Documents clear
PENGARUH CAMPURAN JENIS KAYU TERHADAP BEBERAPA SIFAT KAYU LAPIS*) Sulastiningsih, I M; Sutjigno, Paribotro
Jurnal Penelitian Hasil Hutan Vol 10, No 3 (1992): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11167.183 KB) | DOI: 10.20886/jphh.1992.10.3.90 -96

Abstract

Experimental   plywood (5 -  piy)  were made from  12 wood species  veneers  glued with  urea formaldehyde. Thichness of  veneer  was  1.5  mm  and  the  range  of  veneer  density   was  0.38  -   0.83 g/cm3.  Veneers  were divided  into  3 groups  based on  their  density,  i.e. low,   medium   and  high.  The  plywood properties   were  tested  according  to the  American Standard (ASTM)  and the  Japannese Standard  (JAS)  included  density.  tensile strength.  bending  strength, compression  strength,  and moisture  resistant  bonding  strength.The  results  revealed  that  plywood  density   was  higher  than  veneer  density   (same wood  species)  or average veneer density   (mixed  wood  species).   Tested  mechanical  properties of plywood  increased  if the plywood  density  increased and the relationship  could  be expressed  by  linier regression equations. The tensile strength, bending strength  and compression strength   of plywood  were  tested  both  on parallel and perpendicular to  face grain.  Correlation  coefficient  of  the relation-ship  between  plywood  density   and  those  plywood  mechanical  properties on parallel to face  grain (r = 0.66 -  0.84)  were higher  than  that  on perpendiculor  to face grain  (r = 0.51  -   0. 74). Similar results  were obtained  with F calculated  but all of  them  were  highly  significant.  Based on  those  results it could  be concluded   that some mechanical properties  of plywood could  be estimated   from  its  density, regardless   of  its wood  species.
THE UTILIZATION OF HUMOTEX FOR PROMOTING PLANT GROWTH Sudradjat, R
Jurnal Penelitian Hasil Hutan Vol 10, No 3 (1992): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (12688.474 KB) | DOI: 10.20886/jphh.1992.10.3.77 -84

Abstract

Penelition ini  bertuiuan   untuk   mengetahui  rasio  terbaik   humotex  terhadap tanah  atau gambut yang  dapat mem- berikan pertumbuhan  terbaik  dari tanaman jagung  {Zea mays L. ), Robinia  pseudoacacia  dan  Pinus  sylvestriS.Hasilpenelitian  menunjukkan,   bahwa  rasio  terbaik   humotex  terhadap  tanah  adalah 1 : 1. Penam bahan  humotex terhadap   tanah  meningkatkan   pH  tanah  dan  penyerapan hara  esensial  oleh  tanaman yang mengakibatkan  peningkatan berat  kering   tanaman jagung  sebesar  8 0 -  100%.Pencampuran   humotex  terhadap  gambut  pada rasio mak simum  dapat  meningkatkan pertu mbuhan jagung  15 kali, Robinia  pseudoacacia  15 kali  dan Pinus sylvestris  8 kali. 
PENGARUH PENGAWETAN VENIR DENGAN SENYAWA BFCA TERHADAP KETEGUHAN REKAT KAYU LAPIS DARI KAYU KARET (Hevea brasiliensis) Kliwon, Suwandi; lskandar, M I; Sugitno, Paribotro
Jurnal Penelitian Hasil Hutan Vol 10, No 3 (1992): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (7076.022 KB) | DOI: 10.20886/jphh.1992.10.3.97 -101

Abstract

This paper   describes  the  treatment  of  1.5  mm   x  20  cm x  20 cm rubberwood  veneer  with BFCA compound of   5 %,  10%.   15 %, 20 %  and  control,  and  3  variations of  extender  in urea  formaldehyde   glue  ,    compositionic    10%, 20% and 30%.The  results  reveal   that  the   concentration of  BFCA  influences    the  bonding   strength  of  rubberwood plywood using Indonesian standard. On the  other  hand  the  effect of percentage   of  extender in  tne compostion  of  urea  formal dehyde   glue  is  not  significant on the bonding strength using Indonesian and Japanese standard. But  the interaction. of concentration of BFCA and percentage  of  extender influences  the bonding strength of plywood. 

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