ISO 9044 pdf download.Industrial woven wire cloth — Technical requirements and testing
1 Scope
This International Standard defines terms regarding industrial woven wire cloth for screening purposes and specifies tolerances, requirements and test methods. It applies to industrial woven wire cloth with square apertures, made of steel, stainless steel or non-ferrous metals, (see ISO 4783-2). It does not apply to woven wire cloth coated after weaving nor does it apply to pre-crimped and welded wire screens which are covered in ISO 4783-3 and ISO 1 431 5. It is of limited application to woven wire cloth used for purposes other than screening which may necessitate other requirements. The alternative requirements may be agreed between the purchaser and the supplier at the time of placing the order.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of the ISO/IEC Directives are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of the IEC and ISO maintain registers of currently valid International Standards. ISO 21 94:1 991 , Industrial screens — Woven wire cloth, perforated plate and electroformed sheet — Designation and nominal sizes of openings. ISO 4782:1 987, Metal wire for industrial wire screens and woven wire cloth. ISO 4783-1 :1 989, Industrial wire screens and woven wire cloth — Guide to the choice of aperture size and wire diameter combinations — Part 1 : Generalities. ISO 4783-2:1 989, Industrial wire screens and woven wire cloth — Guide to the choice of aperture size and wire diameter combinations — Part 2: Preferred combinations for woven wire cloth.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.3.2 wire diameter d diameter of the wire in the wire screen NOTE The wire diameter may be altered slightly during the weaving process. See Figure 1 . 3.3 pitch p distance between the mid-points of two adjacent wires NOTE The pitch is the sum of the aperture width w and the wire diameter d . See Figure 1 . 3.4 warp all wires running lengthwise in the cloth as woven 3.5 weft all wires running crosswise in the cloth as woven 3.6 number of apertures per unit length n number of apertures which are counted in a row one behind the other on a given unit length 3.7 open screening area A 0 percentage of the surface of all the apertures in the total screening surface NOTE The open screening area is calculated as the ratio of the square of the nominal aperture width w and the square of the nominal pitch p = w + d, rounded to a full percentage value:
4.3 Permissible number of major blemishes
4.3.1 Woven wire cloth cannot be produced commercially without there being some manufacturing blemishes. The supplier and the purchaser shall agree upon the number and nature of major blemishes which are permissible per unit area of the wire screen. The percentage yield of the wire cloth shall be agreed on with the purchaser and will vary according to the aperture width and size of the piece of woven wire cloth. Unless otherwise agreed between the supplier and purchaser, the maximum number of major weaving blemishes (see annex A), in any roll or roll piece of wire cloth shall not exceed the values given in Table 2.4.3.2 Minor manufacturing blemishes which do not produce oversize apertures or do not significantly affect the surface quality of the wire screen shall be acceptable, unless otherwise specified.