Woven Mesh
Woven wire mesh or cloth or fabric, is commonly used for all kind of applications, from filtration and support to esthetic applications. Woven wire meshes are available in many different varieties, with regard to application and specification. Many design features can be varied; for example: material, wire style/diameter(s) & mesh opening, weaving pattern, finishings like calandering, etc.
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Woven Mesh rolls |
Woven wire mesh can be produced from several materials, for example synthetics like polyester ( PES ), polyamide ( Nylon ), pvdc ( Saran ™), polyethylene ( PE ) and polypropylene ( PP ). Metals are for example: aluminum, ( tinned ) copper, ( galvanised or plain ) steel, stainless steel grades, exotic alloys like Inconel ™ [*], Incoloy ™[*], Monel ™[*], Hastelloy ™[*] and Duplex ™[*], etc. Common applied types of stainless steel are for example: 304, 304 L, 316, 316 L and 321. See also Stainless Steel Types.
Crimped and/or corrugated woven wire mesh is a special type of woven wire mesh - see below.
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An example of heavy/coarse woven mesh (metal) |
An example of fine woven mesh (metal) |
Averinox is able to advise you the appropriate woven mesh type for your (filtration) application. Woven wire meshes are deliverable from stock or can be woven on customers requist.
Square woven wire cloth is definied by the size of the aperture or mesh opening (W) and the wire diameter (d). Mesh count is the number of meshes per linear inch.
The absolute rating is measured by the Bubble Test Method which uses alcohol as test liquid; the absolute size of an aperture or mesh opening determines the biggest ball shaped particle which can pass through the wire cloth. The correlation of this test method with the actual aperture size of a filter cloth has been proven by MPA (Dortmund, Germany 1978).
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Examples of (synthetic) woven mesh |
Synthetic woven mesh (pleated) |
There is no uniform method known to determine the Nominal Filter Rating of a woven wire mesh. Therefore the data often stated should be used with care. The method most commonly used is the so called Multi-Pass-Test. A test fluid, contaminated with particles of various sizes, is passed through the applied filter media under steady flow conditions.
The term Nominal Filter Rating describes the particle size of which a predetermined percentage was retained by the media. The Multi Pass Test is the only method to measure the openings of random fibre or other diffusion bonded filter media which do not have equal and controled apertures such as woven wire cloth.
ISO 4783-1 is the international standard for industrial wire screens and woven wire mesh:
ISO 4783-1: Generalities
ISO 4783-2: Preferred combinations for woven wire mesh
ISO 4783-3: Preferred combinations for precrimped or pressure welded wire screens
Below you will find a more detailed explanation on woven wire mesh:
- Mesh opening w is the clearance between two adjacent warp or weft wires measured in the projected plane.
- Wire diameter d is the diameter of the woven wire measured before weaving.
- Spacing or pitch p is the clearance of the middle line of two adjacent wires or the sum of mesh width w and wire diameter d.
- Warp: total number of wires running parallel to the selvedges.
- Weft: total number of wires running at right angles to the warp wires.
- Mesh number per length unit n (mesh count) is the number of meshes counted consecutively in a row in a unit of length.
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Warp direction
(roll length)
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Weft direction
(roll width) |
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The unit of length can be mm, decimetres or inches, or any other unit. The number of meshes in a length of 25.4 mm is referred to as the mesh.
- Mesh= Number of meshes per inch = 25.4 / p
- n/cm= Number of meshes per cm = 10 / p
- n/cm²= Number of meshes per cm² = (10 / p)²
The Mesh opening M (for example per linear inch) can also be calculated as follows:
- M = (25.4 / mesh count) - d
Open screen area A0: proportion of screen openings in the total woven area as a percentage:
Woven weight W in kg per m²:
This is valid only for carbon steel as per DIN 4189 (will be replaced by ISO 4783). Conversion factors for materials other than steel (index 100) are as follows: stainless steel 101, copper 114, Monel™ metal 112.5, brass 110, phosphor bronze 112.5, nickel 112.5. For more detailed information about preferred woven wire mesh combinations see this Woven Mesh Tables or Downloads.
Many weavings patterns are possible. For example:
Plain weave is the most commonly used type of weaving. Each warp wire crosses alternately above and
below each weft wire. Warp and weft wires generally have the same diameter.
Twill Weave allows a thicker wire and is suitable for heavy meshes. The wire position of twill weave wire
mesh is less stable compared with plain weave.
Dutch Plain Weave is similar to plain weave, while the warp wires are thicker and packed more closely
together.
This type of woven wire mesh is mainly used as industrial filter cloth.
Dutch Twill Weave is a combination of Duch Weave and Twill Weave. It is similar to twill weave, but the
warp wires are thicker and packed more closely together. This type enables a strong wire cloth with super
fine filtration. Ideal for fine filtration.
Five Heddle Weave has a smooth top surface and an open lower surface. It is ideal to withstand high
mechanical strain and excellent filter performance.
Reverse or Reinforced Dutch Weave is the same as Dutch weave except the warp and weft wires are
reversed. The weft wires are thicker than the warp wires.
The opening of the two nearby orientated wires (warp wires or weft wires) at Dutch Weave is difficult to define.
Some examples of common applied weaving patterns:
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Plain weave cloth |
Twill weave cloth |
Dutch plain weave cloth |
Dutch twill weave cloth |
Crimped and/or corrugated woven wire mesh is a special type of woven wire mesh (as per ISO 4783-3).
Crimped woven wire mesh is a special type of woven wire mesh. Crimped woven wire meshes are often used as support for other filtration media, for example in vibrating screens, (high pressure) filters, grids and trays, etc. Crimped woven wire mesh can be manufactured in many styles. Common applied are for example: flat top crimped, double crimped, corrugated cimped etc.
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Heavy woven mesh (coarse) |
Double crimped coarse mesh |
Double corrugated mesh |
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Heavy woven mesh (open) |
Fine Woven mesh
Multifilament wires |
Heavy woven mesh
Flat wires |
Flat top crimped woven wire mesh provides a flat surface which keeps plugging to a minium. Double crimped woven wire mesh result in a very heavy and rigid construction.
Finaly, corrugated (pre-shaped) crimped woven wire mesh is provided with extra crimps in warp and weft directions. This will result in a rigid mesh, even when the mesh opening or aperture is large in relation to the diameter of the wire.
Applied materials for crimped meshes are among others stainless steel types, galvanized steel and plain steel.
Applications can be found for example in the (petro)chemical industry, food & beverage industry and the mining industry. Crimped woven wire meshes are often used as support for other filtration media, for example in vibrating screens, (high pressure) filters, grids and trays, etc.
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Detail: flat top double crimped (heavy) mesh - narrow opening |
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Detail: flat top crimped mesh - large opening |
Averinox has the possibility to deliver all kind of filters or separators as your specifications, based on among
others woven wire mesh, see Filter Elements.
Please find more information here: Downloads.
*Saran™, Inconel™, Incoloy™, Monel™, Hastelloy™ and Duplex™ are registered product names of their respective trademark holders.
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