ISO 9044:2016(en) Industrial woven wire cloth — Technical requirements and tests

ISO 9044:2016(en) Industrial woven wire cloth — Technical requirements and tests

Foreword

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ISO 9044 was prepared by Technical Committee ISO/TC 24, Particle characterization including sieving, Subcommittee SC 8, Test sieves, sieving and industrial screens.

This third edition cancels and replaces the second edition (ISO 9044:1999), which has been technically revised.

1   Scope

This International Standard defines terms regarding industrial woven wire cloth for screening purposes and specifies maximum permissible error, 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 14315.

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 documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 2194, Industrial screens — Woven wire cloth, perforated plate and electroformed sheet — Designation and nominal sizes of openings

ISO 4782, Metal wire for industrial wire screens and woven wire cloth

ISO 4783-1, Industrial wire screens and woven wire cloth — Guide to the choice of aperture size and wire diameter combinations — Part 1: Generalities

ISO 4783-2:1989, 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 document, the following terms and definitions apply.

3.1

aperture width

w

distance between two adjacent warp or weft wires, measured in the projected plane at the mid-positions

Note 1 to entry: See Figure 1.

Figure 1 — Aperture width, wire diameter, and pitch

3.2

wire diameter

d

diameter of the wire in the wire screen

Note 1 to entry: 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 1 to entry: 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 measurements taken

3.7

open screening area

A0

percentage of the surface of all the apertures in the total screening surface

Note 1 to entry: 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:

mml_m1

3.8

type of weave

way in which the warp (3.4) and weft (3.5) wires cross each other

Note 1 to entry: Industrial woven wire cloth is manufactured with square apertures in plain or twilled weave (see Figure 2).

Figure 2 — Types of weave

a) Plain weave b) Twilled weave

3.9

firmness of woven wire cloth

tension existing between the crossing warp (3.4) and weft (3.5) wires and which determines the firmness of the wire cloth

Note 1 to entry: It is affected by the relationship of w to d and by the type of weave.

3.10

mass per unit area

ρA

quantity calculated using the following formula:

where

  d is the wire diameter, in mm;

  w is the aperture width, in mm;

  ρ is the material density, in kg/m(s)3;

  ρA is the mass per unit area, in kg/m(s)2

Note 1 to entry: This formula gives the calculated mass per unit area.

Note 2 to entry: The value 618,1 is based on the crimped wire.

Note 3 to entry: Typical values of ρ for various materials are given in ISO 4783-2:1989, Table 2. For example, the mass per unit area for plain or carbon steel with a density of 7 850 kg/m3 can be calculated using the formula provided as follows:

The formula provided can also be used to calculate the wire diameter (3.2), d, when the pitch (3.3), p, or (w + d), and the mass per unit area, ρA, are known. ln the case of plain or carbon steel (ρ = 7 850 kg/m3), see the following formula:

3.11

major blemishes

production defects which significantly affect the aperture width (3.1) or surface quality of the wire cloth

Note 1 to entry: See Annex A for information.