Patent ID: 7685937

Claim:
A composite doctor blade for retention within a blade holder having a first part which engages one surface of the doctor blade and a second part which engages an opposite surface of the doctor blade, a throat being defined between the blade holder first part and the blade holder second part, the doctor blade comprising; a doctor blade structure made of a homogeneous composite material, the doctor blade structure defining a doctor blade length in a longitudinal direction, a doctor blade width in a lateral direction, and a doctor blade thickness, and a first plane in which the doctor blade length and doctor blade width lie, the first plane being coextensive with a first side surface of the doctor blade structure, and the doctor blade structure defining a cross-sectional plane perpendicular to the first plane and to the doctor blade length, and containing the doctor blade thickness, and the doctor blade width; the doctor blade structure having a front part for doctoring a surface of a roll, and a rear part for retention in a doctor blade holder, the rear part forming a rear end: wherein the rear part of the doctor blade structure has portions forming a profiling which protrudes beyond the first side surface to be arranged to engage the blade holder first part within a throat so as to retain the doctor blade structure in a doctor blade holder, wherein the profiling protrudes beyond only the first side surface of the doctor blade structure so that a side opposite the profiling is without a protruding profiling and the profiling is spaced from the rear end, the doctor blade rear part being configured so as to not engage a blade holder second part at a position opposite the profiling, and wherein the profiling has a width measured in the cross-sectional plane of the doctor blade structure and a height measured in the cross-sectional plane of the doctor blade structure from the first side surface of the blade structure, and wherein the profiling protrudes higher from the first side surface than the width of the profiling in the cross-sectional plane; and wherein the height of the profiling protrudes beyond the first side surface of the doctor blade structure rear part 1.5-3 times the doctor blade thickness; and wherein the profiling has grooves which cut the profiling at regular intervals, with the grooves extending in the lateral direction of the doctor blade structure and extend essentially to the first side surface.