Standard Mesh Construction Styles

Plain Weave

This weave style is constructed using a basic under-over alternating pattern . It is most commonly used in general wire cloth applications.

Intermediate Crimp

This weave style has a more pronounced crimp in the wire where the intersections are placed only odd intervals (these occur at crimps 3, 5, 7, 9). Intercrimp mesh is good for screening applications where the relative opening is large compared to the wire diameter.

Lock Crimp

This weave style is connected at a pre-defined location that locks the intersection into place making a tight weave that resists “racking” and gives it very accurate openings.

Flat Top

This weave style has all the crimps on one side giving the other side a smooth surface. This style also has less resistance to material flow

Welded

Welded wire mesh has intersecting rows and columns of wire that are resistance welded at the intersection to form a grid. Because the wires are fused together, the mesh is incredibly strong and rigid ensuring a long-lasting product.

Measurements

After determining the mesh construction, the next step in this process is to find out the measurements of the Mesh Centers and the Wire Diameter of a particular specification. If these calculations are unknown the desired Mesh Opening or Micron Opening for wire cloth can be used alternatively. Either of these options are the base parameters needed to calculate all of the other necessary information to achieve the following:

  • Facilitate the correct selection of your wire cloth or wire mesh requirements. This can either be for an exact replacement or for alternative specs that closely matches.
  • We can also offer suggestions for an increased production yield or material life duration. This can include additional material specifications as well as wire construction and edging options for screening purposes.

Definitions:

  • Mesh Centers – (C) Refers to the center of one wire to the center of the next parallel wire.
  • Wire Diameter – (d) Refers to the measurement of the entire wire from one side to the other. This is usually expressed as a number within three decimal places.
  • Mesh Opening – (O) Refers to the measurable distance between two parallel wires.

Mesh Count

Refers to the number of openings and fractional parts of an opening that can be counted in one lineal inch. When the point one inch distant from the center of a wire is not a whole number the Mesh Count is expressed in fractions.

1″ divided by 2-1/2 counted openings = .4 Mesh Centers

1″ divided by 4 counted openings = .25 Mesh Centers

Quick Calculations:

  • To find Mesh Centers if Mesh Count is known: 1/ Mesh Count = Mesh Centers
  • To find Mesh Centers if Mesh Opening is known: Mesh Opening + 1 Wire Diameter = Mesh Centers
  • To find Mesh Opening if Mesh Centers are known: Mesh Centers – 1 wire diameter = Mesh Opening

Wire Mesh Index

All wire mesh has a mathematical index. This index is the relationship of the Mesh Centers to it’s Wire Diameter. This relationship is expressed as:

I = C/d

I = Index
C = Mesh Centers
d = Wire diameter

This index is critical in the proper selection of weave styles. Generally the smallest index (2) starts with plain weave and as the index increases the many choices of different weave styles and patterns increases with it. Depending on your needs the range of available Mesh styles is almost unlimited.

Percentage of Open Area

The percentage of open area in wire mesh is the ratio of the total open area of all of the Mesh openings combined relative to the entire screens area.

In Wire Mesh applications that involve a required flow rate, as in material sizing, the flow of liquid or even the luminescence of light that passes through, the Percentage of Open Area is used to determine which mesh specification will be best suited to a particular application. The formula (for square mesh material [same spacing in both directions] and using the same wire dimensions in both directions) the Percent Open Area is as follows:

% OA = ( I-1)^2 / ( I )^2 * 100 Where I = Index (Mesh Centers/Wire Diameter)

%OA = (IL-1)^2/(IL)^2 * (IS-1)^2/(IS )^2*100

4 x 4 Mesh .120” Wire Diameter
.25” mesh centers
Index = .25/.120 = 2.083
%OA = 27.0

Where IL = index of large centers

4 x 4 Mesh .080” Wire Diameter
.25” mesh centers
Index = .25/.08 = 3.125
%OA = 46.2

IS = index of small centers

4 x 4 Mesh .047” Wire Diameter
.25” mesh Centers
Index = .25/.047 = 5.319
%OA = 65.9

To Find the Percentage of open area (%OA) for a rectangular opening find the index for each directions center distance (center distance of 2 wires ) = opening + 1 wire diameter