Method in the operation of a doctor in a paper/board machine
AssigneeValmet Corporation
InventorArvo Viertola
Life of this patent
Estimating the term…
Abstract
A method and device in the operation of a doctor blade in a paper machine/board machine in which different quantities of lubricating medium are supplied into different areas in the longitudinal direction, i.e., along the width, of the doctor blade, independent of one another. A larger amount of lubricating medium is supplied into the area having the maximum extent of wear of the doctor blade.
Claims15
Method in the operation of an elongate doctor blade in a paper machine/board machine in which a lubricating medium is introduced in connection with the doctor blade, the doctor blade being arranged to engage and be operable against an opposed moving surface, comprising the steps of:
- partitioning a jet pipe into a plurality of compartments,
- directing a quantity of lubricating medium into each of the compartments,
- supplying the lubricating medium from the compartments into different areas in the longitudinal direction of the doctor blade at a location proximate to and before engagement of the doctor blade with the opposed moving surface such that the lubricating medium is present during engagement of the doctor blade with the opposed moving surface, and
- regulating the quantity of lubricating medium being supplied into the different areas independent of one another to supply a larger amount of lubricating medium into an area having a larger extent of wear of the doctor blade.
Method in the operation of an elongate doctor blade in a paper machine/board machine in which a lubricating medium is introduced in connection with the doctor blade, comprising the steps of:
- spraying quantities of lubricating medium onto a face of a roll against which the doctor blade is placed at a location proximate to and before the doctor blade in a direction of rotation of the roll, the lubricating medium being spraying onto different areas of the roll face in the longitudinal direction of the doctor blade, and
- regulating the quantity of lubricating medium being sprayed onto the different areas of the roll face independent of one another to supply a larger amount of lubricating medium into an area having a larger extent of wear of the doctor blade.
Method in the operation of an elongate doctor blade in a paper machine/board machine in which a lubricating medium is introduced in connection with the doctor blade, the doctor blade being arranged to engage and be operable against an opposed moving surface, comprising the steps of:
- providing a plurality of jet pipes, each of the jet pipes extending along only one area in the longitudinal direction of the doctor blade,
- supplying a quantity of lubricating medium from each of the jet pipes to be introduced in connection with the doctor blade into a respective one of the areas in the longitudinal direction of the doctor blade at a location proximate to and before engagement of the doctor blade with the opposed moving surface such that the lubricating medium is present during engagement of the doctor blade with the opposed moving surface, and
- regulating the quantity of lubricating medium being supplied into the different areas independent of one another to supply a larger amount of lubricating medium into an area having a larger extent of wear of the doctor blade.
Dependencies are inferred from the claim text.