Abstract: To apply a cover plate on a printing cylinder, particularly to prevent corrosion of the cylinder surface, a double-side coated adhesive foil (2) is applied to a cover plate (1, 36, 65) which is wrapped about the cylinder, so that the cover plate will be adhered to the cylinder by the double-side coated adhesive foil. To install the cover plate, the cover plate (1) with the adhesive foil applied on one side, and, upon removal of a protective strip (S), is first placed in a clamping groove (34, 47, 65) of the cylinder, temporarily secured therein to provide for the adhesive to retain maximum adhesion strength, then wrapped about the cylinder, for example by a resilient pressure roller (40) while stripping off the protective strip (S) from between the cover plate and the cylinder; the end portion of the cover plate, which is left free from adhesive foil, is then wrapped about the trailing edge (52) of the groove, angled against the groove wall, and there adhered by a liquid or contact adhesive.

Abstract: To provide for a tight fit between adjacent tongues (4, 4') subdividing a doctor blade (1), one edge (9) of a tongue (4) facing a slit (5) between the tongues is coated with a material substantially softer than the material of the doctor blade, for example galvanically deposited copper, with a thickness which is in excess of the width of the slit (5) separating the adjacent tongues (4, 4'). Upon closing of the tongues with respect to each other, after having been spread, the tongues will shear off the softer material so that the then formed remaining separation between the tongues will have effectively or quasi zero dimension, thus forming a tight fit between the tongues, while still permitting individual adjustability with respect to a roller against which the doctor blade is to operate.