Author Details

COTO, Zahrial, Indonesia

  • Vol 1, No 1 (2008): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    Indonesia has various hardwood species which are known for their low permeability, means difficult to be flown by fluid.  The fluid absorption into wood is important especially in preservative treatments, in the treatment before slicing wood sampels for wood anatomy and in wetting air dried wood sampels for specific gravity analyses.

    The low water absorption of wood are caused by the air presence in cell lumen which could block the water absorption into wood, and anatomy structure of wood itselves.  One methode to overcome this problem was vacuum treatment.

    The aim of this research was to increase water absorption in cold water soak methode in 6 wood species (Pterocarpus indicus Willd, Nephelium lappaceum L., Artocarpus heterophyllus Lamk., Paraserianthes falcataria L., Shorea spp,  Dipterocarpus spp) through vacuum treatment.  The size of wood samples were    5 x 5 x 20 cm for cross section orientation, 5 x 5 x 10 cm for radial and tangential orientation with 3 replicants.  These wood samples were treated with 5 different treatments : vacuum treatment for 1 hour and cold water soak process for 24 hours (V), vacuum treatment for 2 hours and cold water soak process for 24 hours (VV), vacuum treatment for 3 hours and cold water soak process for 24 hours (VVV), vacuum treatment for 1 hour, cold wtaer soak for 1 hour, and vacuum treatment again for 1 hour and cold water soak process for 24 hours (VRV), dan vacuum and soaking treatment simultaneously for 5 hours and cold water soak process for 24 hours (VRVRV) and as control, without vacuum treatment, just cold water soak process for 24 hours.

    The results of this research showed vacuum treatment could increase water absorption.  The highest value of moisture content was obtained at cross section direction in all wood species, followed by tangential and radial direction.  However, every wood species showed different reactions to these five different treatments.

     

    Keywords: 


    Abstract  PDF
  • Vol 3, No 1 (2010): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    The objective of this research was to analyze the physical and mechanical properties of palm oil trunk.  The result showed that in term of the vertical direction the lower part of stem had better physical (density, moisture content and shrinkage) and mechanical (modulus of elasticity, modulus of rupture, hardness, compressive and tensile strength parallel to grain) properties compared with medium and upper end part.  In the horizontal direction the edge part of trunk had better physical and mechanical properties than medium and center part.

     

    Keywords :              horizontal direction, palm oil stem, physical pro-perties, mechanical properties, vertical direction
    Abstract  PDF
  • Vol 1, No 1 (2008): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    Wood has specific base properties of thermal and combustion. Since being grew normally at marginal soil of mining area, sengon buto, waru and gmelina woods were objectified to investigate thermophisic aspect of their usage as substitution fuel in cement production. Examination based on species, ages and horizontal positions of those woods showed that mean of heating value in oven dry and air dry condition was 4.505 kkal/kg and 4.084 kkal/kg, respectively. Determination of wood substitution to ordinary fuel was acquired by accumulating heating value with prediction value of plantation biomass potency; and enquiry for 850 ha mining area resulted that waru wood will contribute about 5,14% to coal total requisite per year, gmelina and sengon buto will contribute about 5,03% and 4,49%, respectively.

     

    Keywords:  Wood, heating value, substitution fuel


    Abstract  PDF