Woven wire mesh
has major applications as filters in diverse filtration applications for
example flow control, aeration, chromatography, breathers, vents, instrument
filters, sensor protectors, fuel cell parts, dampers and for separation of
liquids and gases.
Metal meshes are
used in applications for filtering, damping and metering in fluid flow systems.
Few applications of the mesh filters are discussed here:
a. Metal mesh filters remove solid particles from liquid streams like
oil, gasoline polymer melts and aqueous suspensions and from air streams or
other gases. Metal mesh has god strength to prevent breakdown during entry in
the filtered stream, adequate ductility to prevent fracture because of
mechanical or thermal shocks and offer efficient and extreme filtering of
materials.
Essential
characteristics needed in filter materials are:
a.
Supreme mechanical strength
b.
Retention of solid particles of
a specified size
c.
Fluid permeability to permit a
specific volume of fluid of a selected viscosity through unit area and
thickness of a filter in the specific pressure gradient
d.
Supreme resistance to
environmental corrosion
Standard pore
sizes are 0.2 – 100 microns. The commonly used metallic filter materials are
stainless steel and high performance materials. For filtration of aggressive fluids,
filter mesh constructed from Monel, Inconel, Titanium and other metal can be
used.
Sintered Hastelloy
wire mesh in the form of sheet or roll, have
excellent performance properties. These properties include flow (gas-liquid),
filtration efficiency, surface properties, strength and adequate corrosion resistance.
By meeting these criteria of a specific application, metal filter mesh media
becomes a practical material that a design engineer for various applications.
Filtration is the
crucial application for any mesh material. Sintered wire mesh is used for
filtration of both gases and liquids. The high strength and corrosion
resistance properties of material make this media perfect for vigorous
application media and with these advantages as long life and easy cleaning.
Common applications are:
- Solvent Filters for chromatography
- Filters for molten plastic
- Catalyst recovery in petrochemical systems
- Food and beverage plants
- Gas filters for chemical processing
- Semiconductor manufacturing applications
- Sensor covers for example smoke stacks and exhaust pipes
The woven wire
mesh is also used in flow control systems, breathers and pressure equalizers
that implement tight and controllable flow features to monitor the flow of
gases or liquids in the process. Few examples of such systems are-
- · Mounted flow restrictors rather microvales and orifice equipments for finding gas leaks in mines
- · Analytical systems
- · Vent plugs that permit internal pressure equalization with external atmosphere in space crafts
- · Trucks and train brake systems
- · Instrument cabinets utilized in vigorous media
- · Vacuum delay valves in automotive carbuerators
- · Pump priming vents for pharmaceutical micropumps
Sintered wire mesh
elements are used for deep filtration by careful distribution of hole size and
length of flow that are based on particle size, shape and component dimension. The
depth-filter offers higher particle retaining capacity as compare to screen
filter even also offers higher pressure drop as compare to screen of equivalent
porosity rating. The design of filter is crucial as pressure drop is determined
by the porous structure, working place and thickness of system.
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