Multi-layer ceramic filter
AssigneeValmet Paper Machinery Inc.
InventorsRolf Hindstrom, Paivi Peltonen
Life of this patent
Estimating the term…
Abstract
The invention concerns a filter construction in particular for suction driers. The filter construction comprises a first filter material layer (1) of a ceramic material, which is the first layer in relation to the flowing liquid, and a second filter material layer (2) of a ceramic material, connected with said first layer. The first filter material layer (1) acts as the filtering layer proper, and the second filter material layer (2) acts as a layer that supports the construction. The invention also concerns a method for the formation of the filter construction.
Claims2
Filter construction, comprising a first filter material layer (1) of a ceramic material, which is a first layer in relation to flowing liquid,
- a second filter material layer (2) of a ceramic material, connected with said first layer (1),
- said first filter material layer (1) having a pore size in the range of about 1 to 3 microns, and acting as a filtering layer proper relative to the flowing liquid,
- said second filter material layer (2) having a pore size within the range of about 4 to 50 microns, and acting as a layer supporting the construction,
- said filter construction being tubular and defining an inner space (10) therewithin,
- said inner space (10) being arranged to receive liquid material to be filtered that passes initially through said first filter material layer (1) and subsequently through said second filter material layer (2),
- said filter construction additionally comprising a third filter material layer (3) fitted to be supported against said second filter material layer (2) and fitted in said inner space (10), and into which the filtered liquid is suctioned by means of negative pressure, and
- wherein said third layer is formed of granular material.
Filter construction, comprising a first filter material layer (1) of a ceramic material, which is a first layer in relation to flowing liquid,
- a second filter material layer (2) of a ceramic material, connected with said first layer (1),
- said first filter material layer (1) having a pore size in the range of about 1 to 3 microns, and acting as a filtering layer proper relative to the flowing liquid,
- said second filter material layer (2) having a pore size within the range of about 4 to 50 microns, and acting as a layer supporting the construction and in said filter construction, material to be filtered initially contacts said first filter material layer (1) and is hydraulically connected to said flowing liquid,
- wherein said first filter material layer (1) has the following composition:
- ______________________________________ Alumina 30 to 50% Alumina Hydride 5 to 15% Talcum 20 to 30% Clay 20 to 30% Polyacrylate, dispersing agent 1 to 5 ml/kg dry matter Water 20 to 30% ______________________________________
- and said second filter material layer (2), has the following composition:
- ______________________________________ Alumina 50 to 60% Alumina Hydride 3 to 7% Clay 10 to 15% Kaolin 18 to 25% Calcium carbonate 1 to 5% Polyacrylate, dispersing agent 0.5 . . . 4 ml/kg dry matter Water 19 to 25%. ______________________________________
Dependencies are inferred from the claim text.