Author Details

DARMAWAN, Wayan, Indonesia

  • Vol 4, No 1 (2011): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    Enhancement of surface appearance of wood products in wood working industry has been done by application of wood stain.  However, the use of wood stains has been recently limited due to emission of a hazardous material.  Through this work a new technique of ammonia fuming has been experimented.  The purpose of the research work was to investigate the effect of ammonia fuming and wood characteristics on the surface appearance of nangka wood (Artocarpus heteropyllus).  The experimental result showed that ammonia in the volume of 2 liter could change significantly the natural color of (16 x 8 x 2) cm size nangka wood after 24 hours of fuming.  Increasing in the period of fuming to 48 hours did not provide any difference in color compared to the 24 hours of fuming, however the 48 hours fuming generated deeper changes in color on the surfaces of the wood.  Heartwood of nangka was observed to generate more significant changes in color compared to the sapwood.  Fresh wood produced a darker color than air-dried wood.  The wood treated by ammonia fuming showed an increase in resistance against termite and decayed fungi attacks.

     

    Keywords   :  ammonia fuming, finishing, heartwood and sapwood, preservation


    Abstract  PDF
  • Vol 2, No 1 (2009): Jurnal Ilmu Teknologi Hasil Hutan - Articles

    Wood products exposed outdoor could be weathered, especially in the tropical region with high in sun light intensity, rain intensity, and relative humidity. An effort that could be done to protect and enhance wood performance is finishing. The purpose of this research is to understand the durability of finishing layer of the finished wood exposed outdoor. The effects of surface condition of boards (planed and unplaned), sawing pattern (quarter sawn and plain sawn), and type of wood finishes (Ultran Lasur UV and Ultran Politur P-03 UV) were studied. The experimental results showed that finishing layer of Meranti batu was the lowest in durability.  The results also indicated that durability of finishing layer depicted by unplanned and plain sawn boards were lower than that of the planed and quarter sawn board. The finishing layer was considered to provide a good protection to the surfaces of board against failures. The presence of failure due to microbial disfigurement and cracking on the surfaces of the finished samples (in average) were 15% and 18% consecutively. On the other hand, the percentages of failure were observed to be 95% due to microbial disfigurement and 81% due to cracking for the unfinished wood. Comparing the two exterior wood finishes used in this experiment, it was found that Ultran Politur P-03 UV provided almost the same protection against microbial disfigurement and cracking compared to Ultran Lasur UV.

     

    Keywords :     Exterior  finishing layer,  microbe stain, surface crack, surface check


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

    This paper presents the effect of extractive and abrasive material of tropical timber (Damar Laut, Mersawa, and Oil Palm wood) and of composite products (Fiber Board and Cement Board) on the  wearing of high speed steel and tungsten carbide cutting tools. The extractive content provides a significant contribution on the chemical wearing of the cutting tools. Oil palm wood and Mersawa wood contain extractives which are more corrosive compared to other wood species tested. Mechanical wear  resistance is influenced by the abrasive material contained in the wood, especially silica, both in wood and wood composite products. Mersawa wood caused the cutting tools wear faster than other types of solid wood. Cement board as a composite product caused the damaged of the cutting edge of high speed steel tool due to high abrasive materials contained in the the cement board. Tungsten carbide tool has higher wear resistance than high speed steel tool.

     

    Keywords : wear resistance, high speed steel, tungsten               carbide, silica, extractive


    Abstract  PDF