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A device for treating a fiber web, especially a device for applying treatment substance for treating a moving fiber web, has at least one nozzle (10) comprising a channel (11) for the treatment substance, a frame part (12), a tip or end (13) of the nozzle (10) and a treatment substance opening (14)

A device for treating a fiber web, especially a device for applying treatment substance for treating a moving fiber web, has at least one nozzle (10) comprising a channel (11) for the treatment substance, a frame part (12), a tip or end (13) of the nozzle (10) and a treatment substance opening (14) providing a treatment substance spray, which nozzle (10) has a tip groove area (20) adjacent to the treatment substance opening (14). The nozzle (10) has at least one opening next to or at the tip groove area (20) for providing a cleaning fluid flow comprising gas and/or liquid to the tip groove area.

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1. A device for treating a fiber web with a treatment substance comprising: at least one nozzle having a tip or end having an outwardly facing tip surface located on an exterior of the nozzle, and a frame, portions of the frame forming a channel connected to a source of fiber web treatment substance

1. A device for treating a fiber web with a treatment substance comprising: at least one nozzle having a tip or end having an outwardly facing tip surface located on an exterior of the nozzle, and a frame, portions of the frame forming a channel connected to a source of fiber web treatment substance;wherein the at least one nozzle has portions forming a fiber web treatment substance opening for forming a spray of fiber web treatment substance positioned at the end or tip of the nozzle, and connected to the channel to receive fiber web treatment substance, the channel extending from the source of fiber web treatment substance to the fiber web treatment substance opening in a first direction;wherein the at least one nozzle has a groove forming a groove area adjacent to the treatment substance opening, the groove extending transverse to the channel and downstream of the treatment substance opening, wherein the groove is adjacent the tip surface;wherein the at least one nozzle has portions forming a first cleaning opening and a second cleaning opening next to or at the groove and connected to a source of cleaning fluid by parallel cleaning fluid channels which extend to a plenum in the frame which communicates with a second channel which extends to a source of cleaning fluid so as to supply a cleaning fluid flow to clean the groove area, wherein the at least one cleaning opening is located upstream in the first direction from the groove, and discharges to the tip surface; andwherein the nozzle tip groove extends between a first end and a second end, and wherein the first cleaning opening is adjacent the tip surface near the first end of the groove and the second cleaning opening is adjacent the tip surface near the second end of the groove, the first and second cleaning openings coinciding with the first and second ends of the groove. 2. The device of claim 1 wherein the source of cleaning fluid is a source of steam. 3. The device of claim 1 wherein the cleaning fluid flow comprises a cleaning fluid spray, and wherein the first and second cleaning openings are arranged such that cleaning fluid spray does not interfere with the spray of fiber web treatment substance by having the source of fiber web treatment substance be of a first selected pressure such that the first selected pressure with the fiber web treatment substance opening forms the spray of fiber web treatment substance having a first speed between 15-175 m/s and by having the source of cleaning fluid be of a second selected pressure such that the second selected pressure with the cleaning openings form the cleaning fluid flow having a second speed between 3-173 m/s which is less than the first speed. 4. The device of claim 1 wherein the cleaning fluid flow and the spray of fiber web treatment substance are arranged to operate at the same time. 5. The device of claim 1 wherein during maintenance breaks of the device the cleaning fluid flow is pressurized water for washing the tip of the nozzle. 6. The device of claim 1 wherein the form of the first and second cleaning openings is round or elliptic. 7. The device of claim 1 wherein the tip or end of the nozzle has a portion of lower thermal conductivity to insulate portions of the tip or end of the nozzle so as to manage the temperature of the tip or end of the nozzle. 8. The device of claim 1 wherein the fiber web treatment substance source is a source of sizing agent, coating color, starch, latex or polyvinyl acetate. 9. The device of claim 1 wherein the source of fiber web treatment substance is a source of sufficient pressure to atomize the fiber web treatment substance as it passes through the fiber web treatment substance opening. 10. The device of claim 1 wherein the source of cleaning fluid is a source of cleaning fluid at a pressure of 10-50,000 Pa. 11. The device of claim 10 wherein the source of cleaning fluid is a source of cleaning fluid at a pressure of 20-4,000 Pa. 12. A nozzle for treating a fiber web with a treatment substance comprising: a frame having a first thermal conductivity, portions of the frame forming a first channel connected to a source of fiber web treatment substance;a nozzle tip mounted to the frame, the nozzle tip having an outwardly facing tip surface located on an exterior of the nozzle tip, the nozzle tip having portions forming a treatment substance opening in fiber web treatment substance receiving relation to the first channel, and arranged to form a spray of fiber web treatment substance, and the nozzle tip having portions forming a groove to which the treatment substance opening extends, the groove defining a groove area which is adjacent the nozzle tip surface;wherein the frame has portions forming a second channel connected to a source of cleaning fluid;portions of the frame forming a cleaning fluid plenum in cleaning fluid receiving relation to the second channel;wherein the nozzle tip has portions forming a first and a second cleaning fluid opening spaced from the treatment substance opening and communicating by parallel cleaning fluid channels with the cleaning fluid plenum, wherein the first and second cleaning fluid openings open to the tip surface for the discharge of cleaning fluid; anda connecting part formed of a material with a second thermal conductivity which is less than the first thermal conductivity, the connecting part mounting the nozzle tip to the frame; andwherein the nozzle tip groove extends between a first end and a second end, and wherein the first cleaning fluid opening is adjacent the tip surface near the first end of the groove and the second cleaning fluid opening is adjacent the tip surface near the second end of the groove, the first and second cleaning fluid openings coinciding with the first and second ends of the groove. 13. The nozzle of claim 12 wherein the source of cleaning fluid is a source of steam. 14. The nozzle of claim 12 wherein the nozzle tip portions forming the first and second cleaning fluid openings and portions forming a treatment substance opening are arranged to discharge a cleaning fluid flow and the spray of fiber web treatment substance at the same time. 15. The nozzle of claim 12 wherein the source of cleaning fluid is a source of pressurized water for washing the nozzle tip. 16. The nozzle of claim 12 wherein the source of fiber web treatment substance is a source of sufficient pressure to atomize the fiber web treatment substance as it passes through the treatment substance opening. 17. The nozzle of claim 12 wherein the source of cleaning fluid is a source of cleaning fluid at a pressure of 10-50,000 Pa. 18. A nozzle for treating a fiber web with a treatment substance comprising: a frame, portions of the frame forming a first channel connected to a source of fiber web treatment substance;a nozzle tip mounted to the frame, the nozzle tip having an outwardly facing tip surface located on an exterior of the nozzle tip, the nozzle tip having portions forming a treatment substance opening in fiber web treatment substance receiving relation to the first channel and arranged to form a spray of fiber web treatment substance, and wherein the nozzle tip has portions forming a groove to which the treatment substance opening extends, the groove extending to the tip surface;wherein the nozzle tip has portions forming a first cleaning fluid opening and a second cleaning fluid opening, connected by parallel cleaning fluid channels to receive cleaning fluid from a plenum which is connected to a source of cleaning fluid, the cleaning fluid openings closely spaced from and upstream of the treatment substance opening, the cleaning fluid openings extending to the tip surface; andwherein the nozzle tip groove extends between a first end and a second end, and wherein the first cleaning fluid opening is adjacent the tip surface near the first end of the groove and the second cleaning fluid opening is adjacent the tip surface near the second end of the groove, the first and second cleaning fluid openings coinciding with the first and second ends of the groove.