Pre-honed doctor blade with a curved profile lamella and method for producing said doctor blade

Abstract

A method of producing a doctor blade from a band. A grinding wheel is positioned above the band with its axis of rotation not at right angles to the edge of the doctor blade. The grinding wheel then is rotated and the band is moved beneath the grinding wheel parallel to its edge.

1 .- 9 . (canceled) 
     
     
         10 . A method for producing, starting from a band, a doctor blade, characterised in that it comprises at least the steps of:
 positioning above the band a grinding wheel with its axis of rotation not at right angles to the edge of the doctor blade;   setting the grinding wheel in rotation;   moving the band beneath the grinding wheel parallel to its edge.   
     
     
         11 . A method as in  claim 10 , characterised in that the grinding wheel is a disk grinding wheel. 
     
     
         12 . A method as in  claim 10 , characterised in that the grinding wheel is a conical grinding wheel with its axis of rotation having an inclination equal to the taper of the grinding wheel. 
     
     
         13 . A method as in  claim 10 , characterised in that, during the manufacturing, the axis of the grinding wheel is parallel to the edge of the doctor blade. 
     
     
         14 . A method as in  claim 10 , characterized in that, during the manufacturing, the axis of the grinding wheel is inclined with respect to the edge of the doctor blade by an angle (α) comprised between 0° and 85°. 
     
     
         15 . A method as in  claim 14 , characterised in that, during the manufacturing, the axis of the grinding wheel is inclined with respect to the edge of the doctor blade by an angle (α) comprised between 0° and 45°. 
     
     
         16 . A method as in  claim 10 , characterised in that, during the manufacturing, the edge of the doctor blade is maintained on the vertical drawn from the centre of the grinding wheel. 
     
     
         17 . A method as in  claim 10 , characterised in that, during manufacturing, the edge of the doctor blade is offset with respect to the vertical drawn from the centre of the grinding wheel. 
     
     
         18 . A method as in  claim 17 , wherein the grinding wheel is a disk grinding wheel with a radius (r) and axis of rotation parallel to the edge of the doctor blade, characterised in that the offset (d) of the edge of the doctor blade with respect to the vertical drawn from the centre of the grinding wheel is comprised between 0 and 0.05*r. 
     
     
         19 . A method as in  claim 18 , characterised in that the offset (d) of the edge of the doctor blade with respect to the vertical drawn from the centre of the grinding wheel is d=0.03*r. 
     
     
         20 . A method as in the  claim 14  for producing a doctor blade as in claim  9  by means of a disk grinding wheel having a thickness, characterised in that the width (p) of the flat portion of the lamella is:
 p=0.5*l*sen a if d=0; 
 p=l*sen α if d=0.5*l.