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

  • 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.

  • Lineal Inch – Refers to the measurable distance in one inch.
  • Mesh Count – Refers to the number of openings that can be counted in one lineal inch.

Formulas

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

Percentage of Open Area

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

Applications that involve a required flow rate, as in material sizing, the flow of air, liquid or even the luminescence of light that passes through, the Percentage of Open Area is used to determine which specification will be best suited to a particular application.

Wire Cloth – Ultra Fine & Fine Openings – Micron Retention

Though difficult to view with the naked eye, ultra fine wire cloth also have very small openings. Similar to Open Area, many applications require a certain opening referred to as a Micron.

Micron Retention is calculated using the numerical equivalent of a millimetre (.03937). Note: The resulting answers may not be an exact match to a particular mesh specification, but there will be close available alternatives.

If the mesh opening is known divide the opening by the millimetre:

O / .03937 = Micron

  1. A 200 x 200 Mesh .0021″ dia. wire has an opening of .0029″.
  2. .0029 / .3937 = 73.66 Microns

If the desired Micron is known multiply the desired Micron by the millimetre:

__ * .03937 = Opening

  1. Desired is a 300 Micron
  2. 300 * .3937 = .0118″ opg
  3. A specification near .0118″ opg is needed
  4. A 50 x 50 Mesh .0085″ dia. wire with an opening of .0115″ is an option.

Wire Cloth – Small & Medium Openings – Mesh Count

Method #1 – If the Mesh Opening is unknown:

(1 – MC * D)^2 * 100 = OA%

  1. 4 * .047 =.188
  2. 1 – 1.88 = .872
  3. .872 * .872 = .6593
  4. .6593 * 100 = 65.93
  5. Open Area % = 65.93%

4 x 4 Mesh .047” Wire Diameter
.203” Opening
Open Area % = 65.9%

Method #2 – If the Wire Diameter is unknown:

(O * MC)^2 * 100 = OA%

  1. .203 * 4 = .812
  2. .812 * .812 = .6593
  3. .6593 * 100 = 65.93
  4. Open Area % = 65.93%

Wire Mesh – Larger Openings – Space Formula

For Wire Mesh when the mesh opening and wire diameter are known:

( O / O + D) ^ 2 * 100 = OA%

  1. 1.00 + .120 = 1.120
  2. 1.00 / 1.120 = 0.892
  3. 0.892 * 0.892 = .797
  4. .797 * 100 = 79.72
  5. Open Area % = 79.72

1″ Opening .120″ Wire Diameter – Lock Crimp
Open Area % = 79.7%

Wire Mesh – Larger Openings – Square Centers

1/2″ Centers .063″ Wire Diameter – Intercrimp
Open Area % = 76.36%

For a square opening when the mesh centers and the wire diameter are known:

(C/D-1)^2 / (C/D)^2 * 100 = OA%

  1. .50 / .063 = 7.93 – 1
  2. 6.93 * 6.93 = 48.02
  3. 7.93 * 7.93 = 62.88
  4. 48.02 / 62.88 = .7636
  5. .7636 * 100 = 76.36
  6. Open Area % = 76.36 %

Wire Mesh – Larger Openings – Rectangular Centers

For a rectangular opening use the centers for each opening direction (large and small) as well as the wire diameter:

(C/D-1)^2 / (C/D)^2 * (C/D-1)^2 / (C/D )^2 * 100 = OA%

  1. 2.00 / .162 = 12.34 – 1 = 11.34 x 11.34 = 128.59
  2. 2.00 / .162 = 12.34 * 12.34 = 152.27
  3. .50 / .162 = 3.086 -1 = 2.086 * 2.086 = 4.351
  4. .50 / .162 = 3.086 * 3.086 = 9.523
  5. 128.59 / 152.27 = .8444
  6. 4.351 / 9.523 = .4568
  7. .8444 x.4568 = .3858 * 100
  8. Open Area % = 35.58 %

2″ Opening X .5″ Opening .162″ Wire Diameter
Open Area % = 38.58 %