„aw“, „as woven“
Haver metal mesh is manufactured from high-quality wires on weaving machines which were developed and assembled by Haver & Boecker’s engineering specialists.
Aperture width, w
Distance between two adjacent warp or weft wires, measured in the projected plane at the mid-positions.
Standard bolting cloth
When calendering, the cloth is reduced to a defined thickness between two steel rollers. This process stabilises the mesh and makes it more resistant to displacement, while at the same time it acquires a smooth and highly uniform surface. Calendered mesh offers a precisely defined ink deposit for each individual application. The smooth surface not only minimizes any differences in the thickness of the ink deposit from print to print and run to run but also squeegee wear.
Haver & Boecker supplies two different options for calendaring and also offers customized calendaring to meet the requirements of individual users.
Standard calendering: The mesh is reduced to the extent that it is 20% less in thickness than double the diameter of a single wire:
D = 2 x d x 0.8.
The mesh openings are not altered and the appearance becomes slightly shiny.
Maximum calendering: The mesh is reduced to a thickness up to 30% below double the diameter of a single wire:
D = 2 x d x 0.7.
This enables the maximum possible reduction in the thickness of the wire cloth without it being deformed. The mesh openings stay the same and the fabric appearance now resembles foil.
Cloth thickness, D
Cloth thickness in microns
Number of apertures per unit length, n: Number of apertures which are counted in a row one behind the other for a given unit length.
Mesh = number of apertures per inch = 25.4: p
Tensile bolting cloth
Theoretical ink volume, Vth
Calculating the theoretical ink volume Vth serves to determine which screen printing mesh specification is most suitable for the application. The calculation is based on cubes whose size is determined by the mesh openings. The volume is determined by the aperture width w and the cloth thickness D.
Formula in cm3 per m2 :
Ultra high tensile bolting cloth
Wire diameter, d
Diameter of the wire measured in the wire mesh. The wire diameter may be altered slightly during the weaving process.