Woven Wire Cloth is a woven metal fabric having either square or rectangular
"working openings" between wires -- produced on large weaving
machines called looms. "Working openings" are the clear
spaces or distances between wires in both directions of each mesh
of a square or rectangular woven fabric.
2.Types of Weaves
3.Types of Crimps
5.Square-Mesh Wire Cloth
8.How to Order
• Aluminum • Brass • Bronze • Copper • Galvanized Steel • Monel •
Nickel • Plain Steel • Stainless Steel 302 • Stainless Steel 304 •
Stainless Steel 316 • Stainless Steel 316L • Stainless Steel 310 •
Stainless Steel 330 • Stainless Steel 347
2.Type of Weaves
Weaves affect the strength, porosity, appearance and feel of wire
cloth. Different weaves are used for specific applications based on
these elements. Choose the weave that will best serve you application.
This is the most commonly used wire cloth weave, offering positive
size control of materials to be screened, strained or filtered.
Each warp wire passes alternately over and under and at right
angles to fill wires. Warp wires are parallel to and equal in
distance from each other and the number of wires per inch is
the same for both warp and fill.
Each fill is passed alternately over and under two warp wires.
The pattern is staggered on successive warp wires resulting
in parallel diagonal twills. Twilled weaves permit the use of
heavier wire for a particular mesh count.
Use of a coarse mesh in the warp and a fine mesh the fill produces
the Dutch weave. The result is a compact, firm wire cloth of
great strength with very firm opening. No opening is apparent
when cloth is viewed from above.
A combination of Twilled and Dutch weave which forms a fine
mesh in one direction and a coarse mesh in the other. Produces
a filter cloth of greater strength than Plain Dutch weave and
finer openings than Twilled weave.
Crimps are knuckles in warp and fill wires which lock all wires into
position. The crimp in wires is formed either during the weaving process,
or with a crimping machine prior to weaving (precrimp). If formed
during the weaving process, the tension existing between the warp
and shute wires fundamentally determines the respective amount or
depth of crimp, which locks the wires in place and in part establishes
the firmness of the wire cloth.
Both warp and fill wires are crimped at each intersection.
Warp and fill wires are crimped twice between as well
as at each intersection.
Warp and fill wires are notched at each intersection to firmly
Smooth Top Crimp
Notched intersections allow for smoother surface than lock crimp.
Selvedge edges are created during or after the weaving process. Edging
allows for after handle and adds durability to the mesh in applications
where these factors are important.
In wire mesh with looped edges, the shute wire is continuous,
looping around at the edge of the cloth together form a smooth
edging the length of the material.
With this process the edge of the wire mesh folded over creating
a rigid siding to the material.
Cut and Tucked Edge
This process utilizes longer shute wires which extend beyond
last warp wire and are then folded over and tucked into the
mesh to create an edge which resembles a looped edge.
5.Square-Mesh Wire Cloth
Square-Mesh Standard wire cloth has warp and shute wires of equal
diameter, and spaced equally in both directions to give square openings.
When the wires are more than 1/2-inch apart, the basis of specification
is the center-to-center distance of adjacent parallel wires.
When the wires are 1/2-inch or closer together (2-mesh and finer),
the basis of specification is the number of openings per lineal inch
counting from the center of any one wire to a point exactly one inch
should always be given in decimal fractions of an inch.
Range of Specifications
(A)Plain-Weave from 1″ center-to-center
with extremely heavy pre-crimped wire, down to 635 mesh with .0008″
is preferred for the finer meshes, because the wires are bent less
sharply than in plain-weave material and larger diameters can be
used for a given mesh: for example, 200-mesh plain-weave uses .0021″
diameter wire, while in twilled weave the wire is .0023″ diameter
for the same mesh.
Square-Mesh wire cloth is normally supplied in 100 foot rolls and
widths of 24″ and more. It can also be furnished in small pieces
cut to your specifications at modest additional cost, as well as
fabricated into Strainers and other products.
Off-Count Mesh is standard wire cloth woven in rectangular openings,
and includes several varieties. The shute wires are spaced farther
apart than the warp wires by 5% or more, and the weave may be either
plain or twilled. In comparison with Square-Mesh wire cloth, the
Off-Count material uses less shute wire (because of its wider spacing),
weaves faster, has a greater percent open area and less mechanical
strength, and is more economical for many applications.
In straining and filtering, when first-cost economy is important,
Off-Count mesh is used widely. The particle-retention﹡of an Off-Count
weave is determined by the smaller inside dimension of its rectangular
openings: when this equals the hole-size of a square-mesh material,
both will have the same nominal retention. The flow-rate of an Off-Count
mesh is slightly greater than for a square-mesh material of the
same retention. Full information on straining and filtering is given
in the sections on Filter Cloth and Strainer.
Off-Count Mesh is specified on the basis of warp mesh by shute mesh-
that is, the number of openings per lineal inch counting first across
the warp wires from the center of any one warp wire to a point exactly
one inch distant. And then counting similarly across the shute wires.
Thus, 90×70 means that there are 90 openings per inch counting across
the warp wires, and 70 per inch counting across the shute wires.
Wire diameters should always be given in decimal fractions of an
Off-Count Mesh can be supplied in small pieces to your specifications,
as well as fabricated into Strainers and other products.
The term Filter Cloth applies primarily to the various weaves of
Dutch Wire Cloth, occasionally to certain specifications of Standard
The specifications of Dutch Filter Cloth materials available from
H.H.W.C are given on pages immediately following.
Filter Cloth is used in filters and strainers for the removal of
foreign solids form a stream of liquid or gaseous fluid.
A Strainer is usually a protective device to remove
unwanted solids from a fluid such as fuel. It consists essentially
of a straining element and a housing. H.H.W.C weaves
the straining media and fabricates strainer elements, together with
their edge-bindings and reinforcements, for insertion in the customer’s
housing or fluid system.
A Filter, by contrast, is usually more complex
and more of a precision instrument, to clarify a fluid or to remove
particles larger than a certain critical size that are known to
b present. Specific requirements of flow rate, pressure drop, and
retention must be met exactly. A filter may include several types
of filter media and often has a pre-coat of diatomaceous earth.
H.H.W.C does not make complete filters, but is a prime source of
woven wire cloth for many leading firms that do.
DUTCH WIRE CLOTH
8.How to Order
Wire Cloth is specified in terms of its mesh, weave, wire diameter,
and metal. When making inquires, requesting samples, or ordering,
please give as complete details as possible about the material and
its intended use so that you will receive exactly the correct material
for your need.
1. Mesh--- number of openings per lineal inch, or size of opening;
2. Wire Diameter---in decimals of an inch: first warp, then shute,
if they differ;
3. Type and Weave of Cloth--- Standard or Dutch, Plain or Twilled;
4. Metal or Alloy;
5. Special Treatment if any--- special crimps, calendaring, selvedging,
6. Quantity and Dimensions--- Quantity largely governs the cost of
manufacture of wire cloth and screen. For quotations, therefore, it
is important that the number of lineal feet and width desired be stated;
7. Length and Width;
8. Intended Use--- including temperatures, corrosive agents, etc;