Spin-drying process and spin-drying installation

Abstract

A method for drying a rolled strip is disclosed comprising: supplying a drying facility comprising two hydrodynamic pads, respectively extending in length over a width of the rolled strip, advancing rolled strip between two hydrodynamic pads in an advancement direction defined from upstream to downstream, applying pressure of the hydrodynamic pads, one towards the other, on either side of the rolled strip, following a clamping plane transverse to the strip, during the advancement of rolled strip, the hydrodynamic pads sliding on the rolled strip by means of a layer of fluid, each of the hydrodynamic pads carrying out a first drying operation by blocking at least one portion of a lubricating layer of the strip coming from upstream towards downstream, and sucking in, via a suction orifice located downstream of hydrodynamic pads, at least a portion of a residual fluid layer, thus performing a second drying operation of the strip.

What is claimed is: 
     
         1 . A method for drying a rolled strip, the method comprising:
 supplying a drying facility comprising two hydrodynamic pads, respectively extending in length over a width of the rolled strip;   advancing the rolled strip between the two hydrodynamic pads in an advancement direction defined from upstream to downstream;   applying pressure of the hydrodynamic pads, one towards the other, on either side of the rolled strip, following a clamping plane transverse to the strip, during the advancement of the rolled strip, the hydrodynamic pads sliding on the rolled strip by means of layers of fluid, each of the hydrodynamic pads carrying out a first drying operation by blocking at least one portion of a lubricating layer of the strip coming from upstream to downstream; and,   sucking in, via a suction orifice located downstream of the hydrodynamic pads, at least a portion of a residual lubricant layer, thus performing a second drying operation of the strip.   
     
     
         2 . The drying method according to  claim 1 , comprising, a temporary or continuous injection of a supply fluid between the rolled strip and the hydrodynamic pads, the injection being carried out by means of one or more supply orifices provided in the hydrodynamic pads or by supply nozzles upstream of the hydrodynamic pads, the injection of the supply fluid being carried out in such a way as to ensure the presence of the layer of fluid by means of which the hydrodynamic pads slide on the strip, ensuring a gap between the rolled strip and the hydrodynamic pads, on each side of the strip. 
     
     
         3 . The drying method according to  claim 1 , wherein the supply fluid comprises oil, or an emulsion comprising air and oil. 
     
     
         4 . The drying method according to  claim 1 , comprising, blowing, via a blowing orifice located downstream of the suction orifice, a projection fluid, such as air, in particular hot air, or else steam, towards the strip in such a way as to detach, from the strip, at least a portion of the residual layer of lubricant and to project it towards the suction orifice. 
     
     
         5 . The drying method according to  claim 1 , comprising evacuating at least a portion of the lubricating layer blocked by the drying stages beyond the lateral edges of the rolled strip. 
     
     
         6 . A drying facility which can be suitable for implementing the method for drying a rolled strip according to  claim 1 , the drying facility comprising, two hydrodynamic pads, arranged facing one another on either side of the strip, the strip being configured to advance between the two hydrodynamic pads in an advancement direction defined from upstream to downstream, the hydrodynamic pads extending in length over a width of the strip, the hydrodynamic pads being configured to be applied under pressure, one towards the other on either side of the rolled strip, following a clamping plane transverse to the strip, during the advancement of the rolled strip, the hydrodynamic pads being configured to slide on the rolled strip by means of fluid layers, each of the hydrodynamic pads being configured to carry out a first drying operation by blocking at least a portion of a lubricating layer of the strip coming from upstream to downstream, and at least one suction orifice, located downstream of the hydrodynamic pads, configured to suck in at least a portion of a residual lubricant layer, thus performing a second drying operation of the strip. 
     
     
         7 . The drying facility according to  claim 6 , comprising at least one supply orifice or at least one supply nozzle configured to carry out a temporary or continuous injection of a supply fluid between the rolled strip and the hydrodynamic pads, the at least one supply orifice being arranged in the hydrodynamic pads or the at least one supply nozzle being located upstream of the hydrodynamic pads, the injection of the supply fluid being carried out in such a way as to ensure the presence of the layer of fluid by means of which the hydrodynamic pads slide on the strip, guaranteeing a gap between the rolled strip and the hydrodynamic pads, on each side of the strip. 
     
     
         8 . The drying facility according to one of  claim 6 , comprising at least one projection orifice located downstream of the suction orifice, the projection orifice being configured to project a projection fluid towards the strip in such a way as to detach, from the strip, at least a portion of the residual layer of lubricant and to project it towards the suction orifice. 
     
     
         9 . The drying facility according to  claim 6 , the hydrodynamic pads having an elongate shape and extending continuously over the entire width of the strip and beyond the lateral edges of the strip. 
     
     
         10 . The drying facility according to  claim 6 , the at least one suction orifice comprising a suction slot provided in the direction of the width of the strip, continuously covering at least the entire width of the strip, in such a way as to produce a suction knife. 
     
     
         11 . The drying facility according to  claim 6 , wherein the at least one projection orifice comprises a projection slot provided in the direction of the width of the strip, continuously covering at least the entire width of the strip, in such a way as to project a knife of projection fluid. 
     
     
         12 . The drying facility according to any one of  claim 6 , comprising at least one pair of two cassettes provided facing one another on either side of the strip, each cassette comprising one of the hydrodynamic pads, the at least one supply orifice or the at least one supply nozzle when the facility is dependent on  claim 7 , and the at least one suction orifice, each cassette being movable in translation relative to one another and relative to the strip in a direction normal to a plane formed by the strip, in such a way as to exert a pressure on the supply fluid injected between each drying stage and the strip, each of the at least one supply orifice or the at least one supply nozzle and of the at least one suction orifice fluidically communicating with, respectively, a supply line and a suction line provided in each cassette, the drying facility comprising at least one pair of transverse beams extending in the direction of the width of the strip, each cassette being removably mounted in translation along one of the transverse beams. 
     
     
         13 . The drying facility according to  claim 1 , each cassette comprising the at least one projection orifice, the at least one projection orifice fluidically communicating with a projection line provided in the cassette. 
     
     
         14 . The drying facility according to  claim 1 , wherein each of the cassettes comprises a cover being a separate part attached on the cassette, the projection slot being obtained by forming a clearance between the cassette and the cover. 
     
     
         15 . The facility according to  claim 6 , wherein the at least one projection orifice is oriented at an angle α with the strip, with a value less than 90°, preferably between 90° and 70°, in particular between 90° and 80° such as 85°.