Method and device for lubricating the cylinders of a roll stand

A method for lubricating cylinders of a roll stand, for roll nip lubrication in the roll stand for a roll band, comprising:

• producing a mixture of water and an oil by a mixing and spraying device, the producing comprising supplying water through a first supply line extending from a water source to the mixing and spraying device, and supplying the oil by a second supply line to the mixing and spraying device, the first supply line including a heating device installed to receive water from the water source and to supply heated water to the mixing and spraying device;
• spraying the mixture onto a strip of the roll band and/or into a roll nip between the cylinders of the roll stand and/or onto at least one of the cylinders of the roll stand;
• interrupting the supply of oil for a period of time of a cleaning phase which is predetermined by a control unit, and during the cleaning phase, heating the water flowing from the water source to the mixing and spraying device through the first supply line to more than 60° C. by the heating device installed in the first supply line to obtain hot water;
• and
• supplying the heated water to the mixing and spraying device from the heating device without storing the heated water in a reservoir,
• wherein the mixing and spraying device includes at least one structural unit, which is a single structural unit, that receives water from the first supply line and receives the oil from the second supply line,
• wherein the at least one structural unit is a nozzle-mixer-unit, and
• wherein the nozzle-mixer-unit is an integrated structural unit configured to mix the water and the oil and to spray the mixture.