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Marolop Sinaga
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PENGARUH GABUNGAN DUA JENIS KAYU DAN JUMLAH LAPISAN TERHADAP SIFAT MEKANIS KAYU LAMINA Marolop Sinaga
Jurnal Penelitian Hasil Hutan Vol 6, No 4 (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.1989.6.4.272-276

Abstract

An experiment of glued lamination has been conducted and their mechanical properties were tested. The pile component of glued laminated wood samples were prepared consisting of two jointed wood species with 2 (two), 3 (three) and 4 (four) layers. The dimension of glued laminated samples is 5 cm x 5 cm x 76 cm and all components were connected by glue. The mechanical properties observed are modulus of elasticity (MOE), modulus of rupture (MOR), compreesion parallel to the grain, shear parallel- to the grain (radial* and tangential) by Balwin universal testing machine with ASTM method.The results show that the mechanical properties glued laminated samples are adequate for construction purpose.
SIFAT MEKANIS GELAGAR KOTAK PERCOBAAN UNTUK KAYU KONSTRUKSI Marolop Sinaga; Sadan Widarmana; Surjone Surjokusumo; A A Mattjik
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 | Full PDF (8424.178 KB) | DOI: 10.20886/jphh.1989.6.3.163-170

Abstract

Experimental    laminated   box  beam  were  constructed    for  their  mechanical  properties  test.  The pile  component  of box  beam  was prepared  consisting  of  solid  wood   as upperside  and  downside   flange  and plywood  or particleboard   as left and  right   web.   The  dimension   of  box  beam  is  9.1  cm  x  20 cm x 244  cm where  the dimension   of solid wood are 5.5 cm x3.5   cm  x 244  cm  and the dimensions   of plywood  and particleboard   are 1.8 cm  x 20 cm x 244  cm. All components   were  onnected   by glue,  nail and  combination    of  both.  The  strength   of  box  beam is based on the static  bending  test especially its  modulus  of elasticity  (MOE) and  modulus  of rupture  (MOR)  by Baldwin  universal testing  machine  with ASTM  method.The results  show  that  the  experimental     box  beam produced   had adequate  MOE and MOR  for construction   purpose. The  nail   and  nail-glue   combination    to  connect  plywood  and particleboard   components    with  solid  wood  give  high  value of  MOE and  MOR  of  box  beam.
PENGARUH LATIHAN KERJA TERHADAP VOLUME LIMBAH EKSPLOITASI Marolop Sinaga; Sampe Radja S; Maman Mansyur
Jurnal Penelitian Hasil Hutan Vol 1, No 1 (1984): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (11980.501 KB) | DOI: 10.20886/jphh.1984.1.1.23-30

Abstract

An investigation of felling waste was carried out at three forest enterproses in North Sumatera. In each forest enterprise, the operation weretrained before data collection was conducted.The result reveals that training has significant effect on reducing the volume of felling waste. The average felling waste before and after training are respectively 0.705 m3/ tree and 0.185 m3/tree.It is therefore recommended that operator needs to be trained before.   
PENINGKATAN PRODUKTIVITAS DAN EFISIENSI PENEBANGAN KAYU MANGIUM DI SATU PERUSAHAAN HUTAN TANAMAN DI PROPINSI JAMBI Sona Suhartana; Marolop Sinaga; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 22, No 3 (2004): 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.2004.22.3.175-182

Abstract

Implementation  of  felling  technique in the timber  estate is not  yet practiced  efficiently and appropriately.  Study  on  the lowest possible felling  technique  (LPFT) is considered  important to increase fellingproductivity and felling  efficiency. This study was carried out at a timber estate  in iambi  in 2003. The aim of this study was to determine the effectof LPFT on fellingproductivity and efficiency.Data collected in this regard were: working time,  wood volume, productivity,  efficiency, stump height and felling  cost.  Two-categories data were analyzed with respect to their possible differences using a t-test.Results revealed that implementation of LPFT brought out more convenient impacts in comparison  to  the  conventional felling   technique  (CFT),   as follows:   (1)   Felling  productivity increased  at  3.177  m3/hr;  (2) felling efficiency  increased  approximately  7.4%;  (3) felling cost decreased by some Rp 159.1;   and (4) the average stump height were 21.14  cm for LPFT  and 32.83 cmforCFT
PRODUKTIVITAS DAN BIAYA PRODUKSI PENEBANGAN HUTAN TANAMAN INDUSTRI DI PT INHUTANI II PULAU LAUT Marolop Sinaga
Jurnal Penelitian Hasil Hutan Vol 23, No 1 (2005): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (5661.306 KB) | DOI: 10.20886/jphh.2005.23.1.69-78

Abstract

Penelitian penebangan hutan tanarnan industri telah dilaksanakan di areal hutan tanaman industri PT Inhutani II Semaras, Pulau Laut. Jenis pohon yang ditebang adalah mangium (Acacia mangium). Penebangan dilakukan dengan sistim tebang habis sesuai dengan tujuan pengusahaan hutan tanaman industri, sehingga contoh uji yang diamati terdiri dari 97 pohon. Perlakuan dalam penelitian ini yaitu penebangan dilakukan dengan meninggalkan tunggak serendah mungkin, dan menggunakan gergaji rantai berukuran kecil mengingat diameter pohon yang kecil tidak seperti diameter pohon pada hutan alam. Tujuan penelitian adalah untuk mengetahui produktivitas dan biaya produksi penebangan hutan tanaman industri. Hasil penelitian menunjukkan bahwa produktivitas penebangan berkisar antara 0,738-11,645 m3/jam dengan rata-rata 3,12 m3/jam. Besarnya biaya penebangan berkisar antara Rp 814/m3-Rp 18.868/m3 dengan rata-rata Rp. 4.411/m3. Produktivitas penebangan dapat ditingkatkan dengan mengefisienkan waktu kerja dan apabila produktivitas meningkat maka biaya produksi penebangan dapat diperkecil sehingga lebih murah. Untuk itu keterampilan para pekerja penebang pohon perlu ditingkatkan sehingga dapat menggunakan waktu seefektif mungkin.
EKSTRAKSI KAYU DENGAN SISTEM KABEL LAYANG GAYA BERA T BER-REM DI AREAL HUTAN TUSAM KPH PEKALONGAN BARAT PERUM PERHUTANI JAWA TENGAH Zakaria Basari; Wesman Endom; Marolop Sinaga
Jurnal Penelitian Hasil Hutan Vol 15, No 6 (1998): Buletin Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6824.087 KB) | DOI: 10.20886/jphh.1998.15.6.371-384

Abstract

Untuk mempermudah teknik  pengeluaran kayu tusam pada arah menurun di daerah  topografi berat di Jawa, alternatif penyaradannya adalah  menggunakan sistem kabel layang gaya  berat ber-rem (GSS). Tujuan penelitian ini adalah untuk mengetahui prestasi kerja dan biaya operasi  penyaradan kayu bulat.                                               ,Hasil penelitian menunjukkan bahwa produktivitas kerja rata-rata sebesar 0,22 m3/rit atau  rata-rata sebesar 2,27  m3/jam. Besar biaya tetap alat Rp. 2.308,00/jam dan biaya tidak tetap mencapai  Rp.6444,44/jam. Adapun biaya ekstraksi sebesar Rp. 3.855,70/m3.
PENGARUH GABUNGAN DUA JENIS KAYU DAN JUMLAH LAPISAN TERHADAP SIFAT MEKANIS KAYU LAMINA Marolop Sinaga
Jurnal Penelitian Hasil Hutan Vol 6, No 4 (1989): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (9126.654 KB) | DOI: 10.20886/jphh.1989.6.4.272-276

Abstract

An experiment of glued lamination has been conducted and their mechanical properties were tested. The pile component of glued laminated wood samples were prepared consisting of two jointed wood species with 2 (two), 3 (three) and 4 (four) layers. The dimension of glued laminated samples is 5 cm x 5 cm x 76 cm and all components were connected by glue. The mechanical properties observed are modulus of elasticity (MOE), modulus of rupture (MOR), compreesion parallel to the grain, shear parallel- to the grain (radial* and tangential) by Balwin universal testing machine with ASTM method.The results show that the mechanical properties glued laminated samples are adequate for construction purpose.
SIFAT MEKANIS GELAGAR KOTAK PERCOBAAN UNTUK KAYU KONSTRUKSI Marolop Sinaga; Sadan Widarmana; Surjone Surjokusumo; A A Mattjik
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.1989.6.3.163-170

Abstract

Experimental    laminated   box  beam  were  constructed    for  their  mechanical  properties  test.  The pile  component  of box  beam  was prepared  consisting  of  solid  wood   as upperside  and  downside   flange  and plywood  or particleboard   as left and  right   web.   The  dimension   of  box  beam  is  9.1  cm  x  20 cm x 244  cm where  the dimension   of solid wood are 5.5 cm x3.5   cm  x 244  cm  and the dimensions   of plywood  and particleboard   are 1.8 cm  x 20 cm x 244  cm. All components   were  onnected   by glue,  nail and  combination    of  both.  The  strength   of  box  beam is based on the static  bending  test especially its  modulus  of elasticity  (MOE) and  modulus  of rupture  (MOR)  by Baldwin  universal testing  machine  with ASTM  method.The results  show  that  the  experimental     box  beam produced   had adequate  MOE and MOR  for construction   purpose. The  nail   and  nail-glue   combination    to  connect  plywood  and particleboard   components    with  solid  wood  give  high  value of  MOE and  MOR  of  box  beam.
PENGARUH LATIHAN KERJA TERHADAP VOLUME LIMBAH EKSPLOITASI Marolop Sinaga; Sampe Radja S; Maman Mansyur
Jurnal Penelitian Hasil Hutan Vol 1, No 1 (1984): 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.1984.1.1.23-30

Abstract

An investigation of felling waste was carried out at three forest enterproses in North Sumatera. In each forest enterprise, the operation weretrained before data collection was conducted.The result reveals that training has significant effect on reducing the volume of felling waste. The average felling waste before and after training are respectively 0.705 m3/ tree and 0.185 m3/tree.It is therefore recommended that operator needs to be trained before.   
PENINGKATAN PRODUKTIVITAS DAN EFISIENSI PENEBANGAN KAYU MANGIUM DI SATU PERUSAHAAN HUTAN TANAMAN DI PROPINSI JAMBI Sona Suhartana; Marolop Sinaga; Ishak Sumantri
Jurnal Penelitian Hasil Hutan Vol 22, No 3 (2004): 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.2004.22.3.175-182

Abstract

Implementation  of  felling  technique in the timber  estate is not  yet practiced  efficiently and appropriately.  Study  on  the lowest possible felling  technique  (LPFT) is considered  important to increase fellingproductivity and felling  efficiency. This study was carried out at a timber estate  in iambi  in 2003. The aim of this study was to determine the effectof LPFT on fellingproductivity and efficiency.Data collected in this regard were: working time,  wood volume, productivity,  efficiency, stump height and felling  cost.  Two-categories data were analyzed with respect to their possible differences using a t-test.Results revealed that implementation of LPFT brought out more convenient impacts in comparison  to  the  conventional felling   technique  (CFT),   as follows:   (1)   Felling  productivity increased  at  3.177  m3/hr;  (2) felling efficiency  increased  approximately  7.4%;  (3) felling cost decreased by some Rp 159.1;   and (4) the average stump height were 21.14  cm for LPFT  and 32.83 cmforCFT
Co-Authors A A Mattjik Ishak Sumantri Maman Mansyur Sadan Widarmana Sampe Radja S Sona Suhartana Surjone Surjokusumo Wesman Endom Zakaria Basari