Abstract
The penetration of sodium sulfite solution into the woods was studied under the following conditions:
(1) Room temperature (15_??_20°C) and without giving pressure
(2) Room temperature (15_??_20°C) and under reduced pressure (0.5 atm.)
(3) 140°C and under giving pressure (12kg/cm2, gauge), (vid. Fig. 1)
(vid. Fig. 2, 3, 4, 5)
Three kinds of softwood and eight kinds of hardwood were used (poplar, lime, spruce, white fir, red pine, birch, alder, itaji, scaber, beech and oak).
For the second condition, (2) Pretreatment is effective to lessen the difficulty of the penetration of sodium sulfite solution into the wet wood.
In case of the third condition. (3) The wood being 80mm long, sodium sulfite solution penetrates to the innermost part within about 25 min.
From this fact, it is considered that the penetration will be completed by 6_??_8 hours treatment when the wood is 750_??_900mm in length. Presumably 6_??_8 hours treatment in factory is sufficient to have sodium sulfite solution penetrated to the innermost part of woods.
