Previously dried timber is placed in boilers with appropriate pressure and medication settings depending on the lumber and type of liquor. With a certain technique, the medicine is fed to the lumber by pressure and vacuum. The lumber extracted from the winner is rested for a set period of time for drawing air.The purpose of impregnating wood is to increase its resistance to moisture, insects, worms and corking, and to make it possible for chemical liquids to penetrate the wood.