Folded sealing blade for a coating applicator

A structure for sealing an upstream side of an application chamber of a coating applicator of a coating device in a paper or board coating applicator wherein the structure is arranged to directly engage a moving roll surface of an applicator roll;

• said moving roll surface defines a direction in which the moving roll surface of the applicator roll moves, so that a portion of the structure slides on the moving roll surface, the structure comprising:
• a metal sealing blade having a width defined between a back edge and a front edge which form opposite edges of the metal sealing blade, and between the back edge and the front edge, are two opposite blade sides which form:
• a first blade surface having portions which form a contact surface which directly engages the moving roll surface, and an opposed second blade surface having portions opposite the contact surface;
• at least one first fold formed in the metal sealing blade between the back edge and the front edge, said contact surface and said first fold are formed in the metal sealing blade before said metal sealing blade is installed in the blade holder such that initial tension has been removed from the metal sealing blade before being installed in the blade holder or before said metal sealing blade contacts the moving roll surface;
• wherein the first fold formed in the metal sealing blade is arranged to reduce tension in the metal sealing blade such that sharpening of the front edge is reduced:
• wherein the first fold which divides the first blade surface into first a part terminating at the back edge and a second part terminating at the front edge;
• wherein the metal sealing blade has a fastening area adjacent the back edge;
• said contact surface includes a surface area for arrangement in direct contact with the moving roll surface, said surface area for arrangement in direct contact with the moving roll surface is located between a tip of the metal sealing blade and said first fold of the metal sealing blade;
• wherein the back edge is arranged, along with the fastening area, to be mounted to a blade holder in the coating applicator of the coating device;
• and wherein portions of the first blade surface second part form the contact surface so the contact surface extending from the front edge toward the first fold. wherein the contact surface is arranged to lie along the moving roll surface of the applicator roll so that at least a portion of the contact surface forms a seal with the moving roll surface and the metal sealing blade extends along the moving roll surface in the direction in which the roll surface moves:
• said contact surface includes a flat surface area or a curved surface arranged to directly contact with the moving roll surface:
• wherein the portions of the second blade surface opposite the contact surface form part of the application chamber.