In the various solid-liquid filters, woven nickel wire mesh is utilized as a filtration media. The solid materials are held in a process identical to a sieve. The accumulation of filtered material in the form of cake on the wire mesh is an essential factor in the filtration. The woven wire meshes have the following technical features:
1. Chemical and heat resistance against the suspension
2. Adequate retention of solids
3. Reliable flow rates while filtration cycle
4. Excellent durability
5. Flat surface for adequate cake discharge
6.Environment friendly as these are usable and recyclable
In the present time, the woven wire mesh is produced from the broad range of metals and alloys.
Stainless steel-chrome and chrome/Nickel, steel, non-ferrous metals, plated metals, high temperature alloys and combination materials
The wire mesh fabrication is specified by the kind of weaving pattern which is identified by the sequence of intersections between the warp and weft wires.
Plain weave wire mesh: Every warp wire passes above and down the successive weft wire and vice versa providing precise mesh opening and the highest mesh stability. It is the standard mesh for the whole applications.
Twill Weave: The warp wire passes up and down two weft wires and vice versa. This kind of weave enables to use the large wire diameters to meet the process needs.
Plain Dutch weaves: Weave pattern identical to plain woven mesh, although the warp wires are bigger and spaced farther apart than the weft wires. Primarily utilized for precoat filters and vacuum filters.
Dutch twill weave: A Dutch weave, but woven in a twill pattern that allows several weft wires to be woven in the same area as plain Dutch weave to obtain a finer filter opening. Usually, it is produced for highly fine filtration applications of 10 micron and finer.
Reverse Dutch weave:A reverse Dutch weave has the warp wires smaller and spaced closer together as compare to weft wires. This weave permits the use of high tensile wires that provide the highly durable and consistent and fine filter mesh.
The reverse twilled Dutch weave is constructed in the same preferences and it provides the special versions of extremely strong mesh with filtration grade down to 45 microns.
1. Changing the wire diameters in the warp direction (wire in the longitudinal direction)and or/in the weft direction (transversal running wires).
2. Changing the count of wires in the warp and weft directions
3. Changing the weave pattern.
Mesh specification selection factors
1. Chemical resistance from acid, caustic solutions and solvents.
3. Easy cleaning of mesh after filtration
4. Filter opening based on the required filtration
5. Kind and dimension of filter
6. Kind of wire mesh support
7. Mechanical strain (pressure, extension, abrasion)
8. Filter cake discharge method
9. Location of filter mesh in the application that shows the quality of filtrate or filtercake