Yusuf Amin
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Modifikasi Alat Pelengkung Kayu Skala Pilot dengan Menggunakan Pemanas Modification of Pilot-scale Wood Bending by Heating Elements Teguh Darmawan; Jayadi Jayadi; Sudijono Sudijono; Ika Wahyuni; Yusuf Amin; Wahyu Dwianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 4, No 1 (2006): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (549.366 KB) | DOI: 10.51850/jitkt.v4i1.282

Abstract

 This paper deals with manufacturing and modification of pilot-scale wood bending machine by heating elements. The machine has specifications as follows: 1000 mm width; 1305 mm height; 430 mm and 470 mm radius of upper part and bottom part of bent plates, respectively; and a manual stick pressure with 870 mm length. The upper part and bottom part of bent plates are equipped with heating elements, which the maximum of temperature is arranged to 200°C by the electric force of 220V/2000 watt. Left and right sides of bent plates are covered by 1150 mm x 950 mm insulation board to maintain the heat. From the temperature measurement, the heating plates were reached 50°C in 2.5 minutes, 100°C in 9.5 minutes, and 180°C in 28 minutes. The modified machine has successfuly bent Acacia solid wood with dimensions of 1100 mm(L) x 50 mm(T) and 10 mm, 20 mm, and 30 mm in thickness (R).
Pengaruh Suhu dan Tekanan Uap Air terhadap Fiksasi Kayu Kompresi dengan menggunakan Close System Compression Temperature and Steam Pressure Dependency on the Fixation of Compressed Wood by Close System Compression Yusuf Amin; Wahyu Dwianto
Jurnal Ilmu dan Teknologi Kayu Tropis Vol 4, No 2 (2006): Jurnal Ilmu dan Teknologi Kayu Tropis
Publisher : Masyarakat Peneliti Kayu Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (198.872 KB) | DOI: 10.51850/jitkt.v4i2.278

Abstract

It is known that compression wood by heat treatment needs approximately 20 hours at 180ºC to attempt the permanent fixation of compressive deformation. On the other hand, even the permanent fixation of compressive deformation by steam treatment is reached in 10 minutes at the same temperature, this method needs expensive apparatus and inapplicable for large wood dimensions. These both problems can be solved by Close System Compression (CSC) method. CSC is a method to press the wood inside an airtight seal chamber, which is placed between the two hot press plates. Wood moisture contents, which evaporate due to heat from hot press, are trapped inside the CSC and produce steam. The wood species used in this research was Randu (Bombax ceiba. L) with dimensions of 2 cm (L) x 2 cm (T) x 3 cm (R). The wood specimens were compressed into 2 cm in radial direction inside the CSC at 140ºC, 160ºC, and 180ºC for 10 min, 20 min and 30 min. They were compressed in air-dried, water saturated and steam saturated conditions, because it was predicted that moisture content of wood and steam pressure, which was produced inside the CSC has significantly effects on the fixation of wood, beside the temperature.The result shows that moisture content of the wood has an effect on the decreasing of recovery of set. However, it was needed 180ºC temperature and 10 kg/cm2 steam pressure to attempt the permanent fixation. Therefore, it was necessary to add water to produce the steam pressure besides that was produced from the evaporation of wood moisture content.