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Measuring wire mesh
Measurement methods according to DIN ISO 9044

Measurement methods according to DIN ISO 9044

Wire meshes are geometric structures. They can be precisely calculated in advance via the wire diameter and aperture width and matched to the respective application by selecting the appropriate material. DIN/ISO 9044 explains the important terms for testing wire mesh.

Wire diameter, d

The wire diameter after weaving may be determined by using one of the following methods:

  • by measuring wires which have been loosened from the wire cloth (e.g. using a micrometer screw).
  • by measuring the wires in the cloth, as far as there is enough space for the measuring instrument.
  • by an optical projection method or a scanning method.

The tolerance of the wire before weaving can no longer be determined in the woven wire cloth because of its severe deformation during weaving. However, the nominal wire diameter processed can be calculated using an empirical formula. We are happy to advise you.

 

Drawing of wire thickness measurement with a micrometer screw Drawing of wire thickness measurement with a micrometer screw Drawing of wire thickness measurement with a micrometer screw
A micrometer screw for measuring the wire diameter

Aperture size: w

The easiest way to determine the aperture size is to use the measuring row method. The number of pitches (p) for a given length (L) is determined. This length is divided by the number of ptiches, which gives the mean value of the divisions. Subtracting the wire diameter (d) from the average pitch gives the aperture size (w).

To obtain the arithmetic mean value of the aperture sizes as many pitches must be measured as are necessary to obtain a reliable statistical value.

For aperture sizes between 16 and 1 mm, 10 pitches should be counted, for smaller aperture sizes up to 0.1 mm, 20 pitches should be counted.

Measuring aperture size with calipers Measuring aperture size with calipers Measuring aperture size with calipers
A caliper (vernier) for measuring aperture sizes over 4 mm, also for wire diameters in aperture sizes over 10 mm
Drawing of a counting glass on a woven wire cloth Drawing of a counting glass on a woven wire cloth Drawing of a counting glass on a woven wire cloth
Measuring a row with a fixed length, e.g. a linen tester for aperture sizes below 1 mm
Drawing of woven wire cloth measuring row Drawing of woven wire cloth measuring row Drawing of woven wire cloth measuring row
Measuring a row with a specific length, for aperture sizes 1 to 16 mm
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HAVER & BOECKER OHG
Wire Weaving Division
Woven Media and Post Weaving Processes
Ennigerloher Straße 64
59302 Oelde, Germany