ISO 3310-1:2016 pdf free
/FREESPACE2ULSTANDARDSPDF/ISO/ISO-3310-1-2016.rar
Every aperture in the metal wire cloth in a test sieve shall have the same probability of being inspected for compliance with the requirements listed in 5.1.
For sieves having 20 apertures or less, measure all full apertures (see Figure 2). For sieves having more than 20 apertures, carry out the examination by the following three tests.
In tests 2 and 3 below, measure the aperture sizes using appropriate equipment having a precision of reading of 1 μm or 1/4 of the maximum permissible error for the average aperture size, Y, whichever is the greater.
View the wire cloth against a uniformly illuminated background. If obvious deviations from uniformity of appearance are found, for example, weaving defects, creases and wrinkles, the sieve is unacceptable.
Carefully and methodically, examine the appearance of all the apertures in order to detect oversize apertures for subsequent measurement. Apertures in fine sieves are best viewed when magnified optically. In the optical method, the magnifications listed in Table 3 may be used.
If any aperture is found to be oversize by more than maximum permissible error of +X, the sieve is unacceptable.
After a sieve has been found to be acceptable in accordance with tests 1 and 2, carry out measurements of the average aperture size as follows.
The minimum number of apertures to be measured in both warp and weft directions in a 200 mm diameter test sieve shall be as listed in Table 4, separately for compliance, certification or calibration.
For test sieves of sizes other than 200 mm diameter, the values in Table 4 should be modified in proportion to the sieving area.
Measure the average aperture size along the centerline of the metal wire cloth separately in two directions, parallel to the warp and weft wires respectively. The measured apertures shall be spaced over the full diameter of the sieve (see Figures 3 and 4).
If the wire diameter is measured separately and not together with the aperture size, measure at least 10 wire diameters, if available, in each direction.ISO 3310-1 pdf free.
