Composite doctor blade
AssigneeMetso Paper, Inc.
InventorsMikko Karioja, Ari Narhi, Harri Ruotsalainen
Life of this patent
Estimating the term…
Abstract
A composite doctor blade to be installed in a blade holder (11) containing a throat (15) has a rear part (14) made of a composite material which has a profiling (16) which protrudes beyond the plane (18) defined by the doctor blade in order to retain the doctor blade in the blade holder (11). At a distance from the rear part (14), part (17) of the profiling (16) protrudes from the plane (18) to one side only. Moreover, the part (17) is higher than its width in the cross-sectional plane of the doctor blade.
Claims21
A composite 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 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 and is spaced from the rear end, 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 above 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.
The doctor blade of claim 3, wherein the height of the part from the first side surface is 1.6-2.4 times the thickness of the doctor blade structure.
A composite doctor blade to be installed in a blade holder which contains a throat, a rear part of the doctor blade having a profiling which protrudes beyond a plane defined by the doctor blade in order to retain the doctor blade in the blade holder, wherein part of the profiling protrudes from the plane to one side only at a distance from the rear part, with the part being higher than its width in the cross-sectional plane of the doctor blade.
A composite doctor blade formed of reinforcement fibers with a matrix of plastic material, the doctor blade for installation within a blade holder having a throat;
- the doctor blade comprising:
- a blade portion extending in a first plane, the blade portion having a front part for engagement against an element to be doctored, and a rear part, a first direction being defined extending between the front part and the rear part;
- and
- a protrusion which extends from the blade between the front part and the rear part out of the first plane, the protrusion for engagement within the throat of the blade holder, wherein the protrusion extends only on one side of the first plane, and wherein a second direction is defined perpendicular to the first plane, and wherein the protrusion extends a height in the second direction away from the first plane;
- and wherein the projection has a width in the first direction, and wherein the projection height is greater than the projection width.
Dependencies are inferred from the claim text.