The influence of different ramp times on CCA uptake of fir (Abies bornmulleriana Mattf.) at constant vacuum and pressure condition


USTA İ. , Despot R., Hasan M.

WOOD RESEARCH, cilt.50, sa.3, ss.59-72, 2005 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 50 Konu: 3
  • Basım Tarihi: 2005
  • Dergi Adı: WOOD RESEARCH
  • Sayfa Sayıları: ss.59-72

Özet

This study was particularly design to determine the preservative uptake of CCA (Copper/Chrome/Arsenic) at different ramp (rate of increase in pressure) and constant pressure times on longitudinal, tangential and radial penetrations of fir (Abies bornmulleriana Mattf.) which grown indigenously in Turkey,. The experimental samples of 2 cm cubes were initially kiln-dried to 12% Moisture content, and were then treated at different ramp times; 5, 15, 30, 60, and 90 sec. under the constant vacuum of -0.84 bar for 15 min. and constant pressure of 4 bar in duration of 5 min. The preservative uptake was determined as the percentage of void volume filled (VVF%) for either flow directions at each ramp time. The results showed that the VVF% was, as expected, markedly greater in the longitudinal flow direction than both in the tangential and radial flow directions. In comparison to the VVF% laterally, it was greater in tangential direction than in radial direction in either treatment schedules. In this issue, although the trend seemed to be the similar between the flow directions, quite different patterns were observed within each direction for penetration and ramp times. Accordingly, conclusions were listed separately for each flow direction.