TECHNICAL REQUIREMENTS ABOUT INDUSTRIAL WIRE SCREENS (ISO 14315):
1) Aperture Width (w): The distance between two adjacent warp or weft wires, measured in the projected plane at mid positions.
2) Wire Diameter (d): The diameter of the wire in the wire screen.
3) Pitch (p):
(i) Distance between the middle points of two adjacent wires.
(ii) Nominally the sum of the aperture width (w) and the wire diameter (d).
4) Warp: All the wires running lengthwise in the screen as manufactured.
5) Weft: All wires running crosswise in the screen as manufactured.
6) Number of apertures per unit length: The number of apertures which are counted in a row, one behind the other on a given unit length.
7) Open Screening Area (Ao):
(i) Percentage of the surface of all the apertures in the total screening surface.
(ii) Ratio of the square of the nominal aperture width (w) and the square of the nominal pitch (p) , i.e
p = (w+d), rounded to a full percentage value:
A0 = 100 x (w x w) / (w+d) x (w + d)
8) Firmness of industrial wire screen :
Tension existing between the crossing of warp and weft wires and which, together with the interlocking, determines the firmness of the wire screen. Also note, that it is affected by the tensile strength of the material, by the relationship of (w) to (d), and by the type and the depth of the crimp.
9) Major blemishes:
Production defects which significantly affect the aperture size or surface quality of the wire screen.