||All kinds of Wires
||Variety of Filters & Strainers
a "stranded" wire cloth (see below), used in filtration
and straining. It is typically 36×36 or 36×32 mesh, and is woven in
any desired metal. The warp is formed by 36 groups of wires per inch,
each group including 5 wires .007″-diameter lying side by side and
woven as one, while the shute will consist of 36 or 32 groups per
inch, each with 7 wires with a diameter of .005″.
BACK-UP CLOTH--- a heavy wire mesh, usually calendered,
supporting a fine mesh in filtration or straining.
BOLTING CLOTH--- a variety of square-mesh Standard
wire cloth, described below under "Mesh, Square."
BUNCHED WIRE--- see "Mesh, Stranded" below.
to pass wire cloth between heavy rollers. This flattens of the wires
and gives the material a smoother surface. Heavy wire cloth, when
used as a support for a lighter, fine-mesh material ("back-up
cloth"), is usually calendered to reduce wear on the more delicate
cloth. Calendering can also give a finer degree of filtration with
a particular mesh and wire diameter. Also called "Rolling"
CLEAR OPENING--- see "Opening" below.
COIN--- to stamp wire cloth for the purpose of shaping
or compacting it. Wire-mesh discs are often coined at the edges to
lock the wires together and reduce raveling.
COUNT--- the number of openings per lineal inch in
a woven material; also called Mesh.
CRIMP--- corrugations in the wires of woven-wire
cloth, which tend to hold the wires in place and reduce the deformation
of hole-size and shape in use. In the lighter meshes, crimps at the
points of intersection are formed automatically by the action of the
loom; in the heavier meshed the wires must be crimped before weaving.
As opening size and wire diameter increase, crimping by the loom becomes
less pronounced and, at the same time, more necessary if the cloth
is to be stable. Hence pre-crimping is required with the heavier wires
and more open weaves.
Crimp, Double--- crimps in both warp and shute at
all points of intersection, formed automatically by the loom. Plain-weave
square-mesh wire cloth is also called "Double-Crimp."
Crimp, Flat-top--- Lock-Crimp wire cloth with all
crimps on the lower surface only, to leave the top surface smooth
and all in one place.
Crimp, Inter or Intermediate --- extra crimps, formed
in the wire before weaving, in either or both warp and shute and spaced
equally between the normal crimps at the points of intersection. It
is used mostly in the coarser weaves of light wire. Also called “Multiple-Crimp”.
Crimp, Lock--- similar to Intermediate Crimp, except
that the additional crimps are close to both sides of every point
of intersection instead if half-way between. It gives maximum rigidity
and firmness to the cloth, and helps maintain even spacing of the
wires in the very open weaves.
Crimp, Multiple--- see “Crimp, Intermediate” above.
Crimp, Semi-Intermediate--- intermediate crimping
in the shute only, in addition to the normal double crimp in both
warp and shute.
Crimp, Single--- Crimps in warp only, or shute only,
at the points of intersection.
DUTCH WIRE CLOTH
--- One of the two major types of wire cloth (the
other is Standard). It has warp wire heavier than the shute, and the
shute is driven up tight so that the wires overlap to form narrow,
twisting passageways through the cloth that appear triangular when
the material is viewed diagonally. You cannot see directly through
Dutch, as you can through Standard, wire cloth. The weave may be plain
or twilled (see illustrations under "Weave " below), and
both varieties offer greater rigidity and 4 to 8 times the mechanical
strength of Standard wire cloth for equal particle-retention. Its
principal use is in straining and filtration. Compare with "Standard
Wire Cloth" below, and see also the catalog section on "Filter
Cloth" and "Strainers."
FEDERAL SPECIFICATIONS--- Wire Cloth. The following
apply to many non-MIL applications:
Industrial Wire Cloth --- RR-W-360
Insect Wire Screening --- RR-S-141a
FILL, FILLER, FILLING --- see "Shute" below.
FILTER--- a device employing filter leaves or tubes
of woven-wire cloth, often with an additional filter medium such as
a pre-coat of diatomaceous earth. They are used for the clarification
of a liquid or gaseous fluid or the precision removal of particles
known to be present. Compare with "Strainer" below; see
the section on "Filter Cloth," "Off-Count Mesh,"
FILTER CLOTH--- Wire Cloth used for filtration and
straining. It includes primarily plain and twilled Dutch wire cloth,
and also certain specifications of square-mesh and off-count Standard
wire cloth. It is used for filter elements, and is fabricated into
strainers and other mesh products. Full information is in the "Filter
FILTRATION --- the clarification of a fluid by the
removal of solid particles. See also "Retention" and compare
with "Straining" below.
GAGE, GAUGE--- the measure of a wire diameter, expressed
as an arbitrary number in accordance with one of several different
gage systems such as American Wire Gage, Washburn & Moen, etc.
To avoid confusion, wire sizes should always be given in decimal fractions
of an inch - but when a gage designation is used, the system must
HARDWARE CLOTH --- an inexpensive grade of square-mesh,
plain-weave Standard wire cloth, galvanized-after-weaving, and of
a relatively light wire. The mesh is generally between two eight (openings
per lineal inch).
MARKET GRADE --- a variety of Standard wire cloth,
described below under "Mesh, Off-Count."
MESH--- the number of openings per lineal inch in
a woven material; also called Count.
MESH, OBLONG OR OBLONG-SLOT--- see "Mesh, Rectangular"
Standard wire cloth, plain ort willed weave, with the shute spaced
more widely then the warp by 5% or more. It has a greater percentage
of open area and flow rate then the equivalent square-mesh cloth,
and is more economical for a given application. In specifying off-count
mesh, the number of openings per inch ("mesh") counting
across the warp wires is given first, then the mesh counting across
The major varieties of Off-Count Mesh are as follows:
Market Grade --- an economical straining material
in any desired metal, woven in meshes from 40 × 33 in .012"-diameter
wire to 200 × 190 in .0021"-diameter wire. It is stronger than
the equivalent Strainer Cloth.
Pressing Cloth ---a copper, nickel, or Monel material
used in the head and buck of commercial pressing machines to distribute
the heat evenly. Meshes are 50 × 40, 60 ×50, and 64 × 56 only, in
wire diameters from .0065" to .009".
Strainer Cloth -- the least expensive fine-mesh wire
cloth made, woven in brass only. Originally developed for the dairy
industry, it now has many household and light-industrial uses such
as straining paint and liquid fuel. It is sold in 100-foot lengths,
and is also packaged in rolls of five square feet for sale through
hardware stores. Most specifications of Strainer Cloth are off-count,
ranging from 40 × 32 in .0075"-diameter brass wire to 120 × 88
in .0035"-diameter brass. In addition, two brass square-mesh
materials are classified as Strainer Cloth: 20 × 20 and 30 × 30 mesh,
in .01" and .007" diameter wire respectively. In comparison
with Market Grade, the wires in Strainer Cloth are slightly thinner
and the mesh is slightly more open.
MESH, RECTANGULAR --- plain weave Standard wire cloth
with rectangular or oblong openings.
MESH, STRANDED --- wire cloth with both warp and
shute composed of several wires lying side by side and woven as one.
Stranded wires are also called "Bunched."
MESH, SQUATRE --- plain or twilled Standard wire
cloth, with equal spacing of warp and shute to give square openings.
In meshes of 2 per inch and finer it is specified by the number of
openings per lineal inch; in meshes coarser than 3, by the center-to-center
distance between adjacent parallel wires.
Two minor varieties of Square-Mesh Cloth are:
Bolting Cloth ---
a precision-woven square-mesh Standard wire cloth, woven on special
double-stroke looms, of custom-draw wire (usually Type 304 Stainless)
with a super-smooth finish. It has the maximum possible uniformity
of hole size, with lighter wires and a greater percentage of open
area than similar specifications of regular square-mesh cloth. Bolting
Cloth is used for sifting and sizing fine powders such as flour and
ceramics, for removing fine particles from slurry, and in preference
to silk in screen-printing processes.
Space Cloth--- plain weave square mesh Standard Wire
cloth with openings slightly larger than the equivalent ordinary square
mesh material. Since it is used for the sizing of coarse dry solids
such as coal and gravel, the basis of specification is the width of
its clear opening - the distance between the inside surface of adjacent
parallel wires. Openings range from 1/8″× 1/8″ to 4″×4″.
MICRON --- 1/1000 millimeter; 0.00003937 inch; represented
by the Greak letter mu(μ). It is the unit of measurement of the particle-retention
of filter media. A table of micron/inch equivalents is given in the
MICRONIC FILTER CLOTH --- Dutch wire cloth in meshes
giving a particle retention of, roughly 50 microns or finer.
OPEN AREA--- the ratio of the area of the open spaces between the
wires to the total area of a piece of wire cloth, expressed as a percentage.
OPENING--- the distance between the inside surface
of adjacent parallel wire. It is the basis of specification of Space
Cloth, and a controlling factor in the retention of wire cloth.
PRESSING CLOTH--- a variety of Off-Count mesh; see
RECTANGULAR MESH--- see "Mesh, Rectangular."
RETENTION, RETENTIVITY --- the ability of a filter
medium, such as wire cloth, to prevent the passage of solids. It is
expressed in terms of the diameter, usually in microns, of the largest
spherical solid particle that will normally pass through the filter
RIDDLE, FOUNDRY --- a type of coarse-mesh sieve for
separating or sizing relatively large object or particles. They usually
have wooden rims, range from 12 to 14 inches in diameter, and employ
wire cloth from 2 to 8 mesh.
ROLL --- the normal unit of bulk sale for wire cloth.
The nominal length is 100 feet, ±10%. Widths range from 24″up, with
tolerances of 1/16″to 1/4″according to mesh. Invoices are based on
the actual length supplied.
SELVAGE--- ("self-edged") A finished edge
on wire cloth to prevent raveling. The traditional selvage is woven
into the edges of rolls 24 inches and more in width, and cannot be
added after weaving.
SHIELDING CLOTH --- wire cloth used for shielding
radio-frequency equipment and rooms. Per MIL-E-4975A (ASG), it is
22-mesh with .015″-diameter unlacquered copper wire. The warp is soft-annealed,
the shute hard-drawn.
SHOOT --- see "Shute" below.
SHUTE --- the wires running crosswise in the cloth
as woven. They ate passed back and forth through the warp wires by
the shuttle in the loom. Corresponds to the "Weft" or "Woof"
in textiles, and is also called "Fill." See the illustration
SPACE --- the clear opening between the wires in
SPACE CLOTH --- a variety of plain-weave square-mesh
Standard wire cloth, described above under "Mesh, Square."
STANDARD WIRE CLOTH ---
one of the two major types of wire cloth (the two major types of wire
cloth (the other is Dutch). It has warp and shute wires of equal diameter,
is woven plain and twilled in square and off-count meshes. Its holes
lie in the plane of the cloth so that you can see straight through,
as contrasted with Dutch wire cloth (see above).
STRAINER--- an assembly of woven-wire cloth for the
removal of unwanted foreign particles from a stream of liquid or gas.
It includes any necessary fittings and reinforcements, is usually
complete in itself, and may be considered as a protective device primarily.
Contrast with "Filter" above, and see also the sections
on "Filter Cloth," "Off-Count Mesh," and "Strainers."
STRAINER CLOTH --- a variety of Standard wire cloth; see
under "Mesh, Off-Count," above.
STRANDED WIRE CLOTH --- see "Mesh, Stranded" above.
TWILLED --- see under "Weave" below.
WARP --- the foundation wires of woven-wire cloth, formed
of wire running the long way of the material as woven. The warp wires
are alternately raised and lowered during weaving, and the shute wire
is passed back and forth between them in the shuttle. The weave -
plain or twilled - is determined by the heddle pattern of raising
and lowering the warp wires. See illustration under "Weave."
WEAVE --- the pattern of interlaced warp and shute wires
in woven-wire cloth, determined by the sequence in which individual
warp wires are raised lowered by the heddle for passage of the shuttle
carrying the shute wire.
Weave, Double-Crimp --- a designation of the finer
meshes of plain-weave square-mesh Standard wire cloth that take a
double crimp automatically in the loom. See "Crimp" above.
Weave, Herringbone-Twill --- Twilled wire cloth with the
twilling reversed at regular intervals to produce a multiple-V or
Weave, Plain --- each shute wire passes alternately
under and over successive warp wires, and e ach warp wire passes alternately
over and under successive shute wires. Used in Standard and Dutch
Weave, Plain-Dutch ---
Dutch wire cloth (warp wires heavier than shute) in plain weave.
Weave, Twilled --- each shute wire passes alternately
under and over two successive warp wires, and each warp wire over
and under two successive shute wires, in a staggered arrangement creating
a diagonal pattern in the cloth. Twilling requires less bending of
the wires than plain weave, allowing heavier wire for a given mesh
to provide greater strength. Both Standard and Dutch cloth are twilled.
Weave, Twilled-Dutch ---
Dutch wire cloth (warp wires heavier than shute) in twilled weave.
WEFT --- see "Shute" above.
WIRE CLOTH --- a general term for material woven
from metallic wire.
WOOF --- see "Shute" above.