Device for applying a fluid to a roller

A machine comprising a transfer roller and a fluid distribution device for applying a fluid onto the transfer roller, the fluid distribution device comprising an elongated chamber extending in an axial direction, at least one inlet for letting a fluid into the chamber, a longitudinal opening extending in the axial direction and adapted to face the transfer roller when the device is in use so as to allow fluid to exit the chamber and contact the transfer roller, and only one wiper blade extending along at least a portion of the longitudinal opening, in the axial direction, the chamber having two axial ends;

• wherein the chamber includes, at each of the two axial ends of the chamber, a wall separating the chamber from a cavity, wherein the wall has a wall surface arranged to face the transfer roller when the device is in use, the wall being dimensioned so that the wall surface will be distanced from the transfer roller when the device is in use, so as to allow fluid to exit the chamber via a gap between the wall surface and the transfer roller, wherein the wall surface is spaced from a surface of the transfer roller by the gap, the gap having a size, at a lowermost portion of the gap, in a radial direction of at least 5 mm,
• wherein the cavity is configured to receive the fluid that exits the chamber through the gap and is configured to lead the fluid towards a drain outlet,
• whereby the drain outlet is connected to and extends from the cavity, the drain outlet being configured to receive the fluid entering the cavity from the chamber, such that the fluid is drained through the drain outlet and recirculated, and
• wherein the only one wiper blade is arranged at a lower edge of the longitudinal opening, the transfer roller being arranged to rotate in a direction such that a surface of the transfer roller facing the longitudinal opening moves downwards during rotation of the transfer roller and the only one wiper blade is configured to remove excess fluid received by the transfer roller via the opening during rotation of the transfer roller.

A machine comprising a transfer roller and a fluid distribution device for applying a fluid onto the transfer roller, the fluid distribution device comprising an elongated chamber extending in an axial direction, at least one inlet for letting a fluid into the chamber, a longitudinal opening extending in the axial direction and adapted to face the transfer roller when the device is in use so as to allow fluid to exit the chamber and contact the transfer roller, and a wiper blade extending along at least a portion of the longitudinal opening, in the axial direction, the chamber having two axial ends;

• wherein the chamber includes, at each of the two axial ends of the chamber, a wall separating the chamber from a cavity, wherein the wall has a wall surface arranged to face the transfer roller when the device is in use, the wall being dimensioned so that the wall surface will be distanced from the transfer roller when the device is in use, so as to allow fluid to exit the chamber via a gap between the wall surface and the transfer roller, wherein the wall surface is spaced from a surface of the transfer roller by the gap, the gap having a size, at a lowermost portion of the gap, in a radial direction of at least 5 mm,
• wherein the wiper blade is arranged at a lower edge of the longitudinal opening, the transfer roller being arranged to rotate in a direction such that a surface of the transfer roller facing the longitudinal opening moves downwards during rotation of the transfer roller and the wiper blade is configured to remove excess fluid received by the transfer roller via the opening during rotation of the transfer roller, and
• wherein the cavity is configured to receive the fluid that exits the chamber through the gap and is configured to lead the fluid towards a drain outlet, whereby the drain outlet is connected to and extends from the cavity, the drain outlet being configured to receive the fluid entering the cavity from the chamber, such that the fluid is drained through the drain outlet and recirculated.