are thus unheated chips that normally have the same temperature as the ambient temperature u00b1 5 u00b0 c the pressure in the vessel can be adjusted as necessary through a control valve 31 arranged in a valve line 4 at the top of the impregnation vessel possibly also in combination with control of the steam st via input lines 5 when atmospheric pressure is to be established this valve line can open out directly to the atmosphere it is preferable that a pressure is established at the level of atmospheric pressure or a slight deficit pressure by the outlet 4 of magnitude u2212 0 5 bar u2212 50 kpa or a slight excess pressure of magnitude up to 0 5 bar 50 kpa input of a ventilating flow sw_air sweep air can be applied at the top as necessary which ensures the removal of any gases present the impregnated chips are continuously output via output means here in the form of an outlet 10 possibly also in combination with bottom scrapers not shown in the drawing at the bottom of the impregnation vessel 30 according to the invention a first input line 7 a with impregnation fluid bl 1 is connected to the impregnation vessel at a first height p 1 on the impregnation vessel corresponding to distance h 1 below the strainer 6 which height is arranged under a maximum level liq_lev of the chips in the impregnation vessel the temperature of the impregnation fluid bl 1 is adjusted by temperature regulation means 32 to a first temperature before its addition at this first height in this case a shunt circuit.