As the name implies, full cell process is to make the wood cell filled with antiseptic solution, make the wood retained the most massive antiseptics. This method is most suitable for water borne wood preservative treated wood, also apply to handle harbour wood piles, sleepers and so on coal creosote. The process can be divided into 5 stages:
Before 1, the vacuum:
The wood into the impregnating tank pressure, close the tank after the door, open the vacuum pump, vacuum pumping to the impregnating tank (usually 0.080 ~ 0.095MPa), keep for 15 minutes to 1 hours, to draw out the wood cell lumen in the air, which makes the wood is easily preservatives Baptist note, and a decrease in the pressure relief when the preservative back, keeping more preservative in wood. This is also the method is different from the empty cell method and the modified empty cell process in.
The 2 stage, preservatives:
In the case of the vacuum pump is switched off, i.e., to maintain the original vacuum conditions, adding preservative solution. If the impregnating tank before turning off the vacuum pump in preservative fill pressure leaching residue, then down a tank in the middle of the air, or generated by processing solution vapor is compressed into the upper note leaching tank, so as to continue adding preservative solution, these gases filling material in the upper wood pile in vacuum is evacuated. Space, so, makes this part of wood preservative solution less number of absorption, causing the same batch of wood on uneven results.
3, the compression stage:
When the preservative fill pressure impregnation tank, close the vacuum pump, vacuum pressure (after elimination, can be used in hydraulic, can also use air pressure), to achieve the required pressure (usually 0.8 ~ 1.5MPa) maintain a period of time (generally 2 ~ 6 hours), until the required dose has anti rot deep is pressed into the wood, or wood preservative solution absorption to reject point. When the end of compression stage, remove the pressure, because the expansion effect of a small amount of air is compressed in wood preservative solution in the compression stage, absorbed by the wood has 5 ~ 15% at this time will recoil from the wood, back pressure impregnating tank.
4, liquid discharge stage:
In relieving pressure, the role of the use of preservative solution of gravity, or with a liquid discharge pump, the pressure leaching of preservative solution injection tank returns to the preservative solution in the storage tank.
Vacuum phase, after 5:
Exhaust preservative solution, close all valves, connected with the vacuum pump, vacuum stage after the start. After the vacuum degree of vacuum and vacuum can be the same as before (0.080 ~ 0.095MPa), or slightly lower, keep 10 ~ 30 minutes. Then release the vacuum, released in the preservative solution after vacuum phase out of the. Open the tank door, remove the treated wood, a cycle of anti-corrosion treatment have been completed.
The impregnating tank out of wood from the pressure may be a drop phenomenon, in order not to pollute the environment and recycling of preservatives, can be just processing wood preservative good stored for a period of time in the drop zone, until no longer drops so far.
