INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWlE~YHAPO~HAR OPTAHM3AUMR fl0 CTAHJJAPTbl3A~MM.ORGANISATION INTERNATIONALE DE 6JORMALISATION

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1 i International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONWlE~YHAPO~HAR OPTAHM3AUMR fl0 CTAHJJAPTbl3A~MM.ORGANISATION INTERNATIONALE DE 6JORMALISATION Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Industrial wire screens and woven wire cloth - Guide to the choice of aperture size and wire diameter combinations - Part 3 : Preferred combinations for pre-crimped or pressure-welded wire screens Tamil et tissus m&alkques indus triels - Guide pour Ie choix des combinaisons d ouverture de maille et de diamktre du fil - Partie 3 : Combinaisons preferentielles pour tissus prhformks ou tissus soudhs sous Pression First edition U DC Descriptors : openings, sizing screens, wire cloth, dimensions. Ref. No. ISO4783/ (E) Price based on 6 pages

2 Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards institutes (ISO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 4783/3 was developed by Technical Committee ISO/TC 24, Sieves, sieving and other sizing methods, and was circulated to the member bodies in December lt has been approved by the member bodies of the following countries : Canada Egypt, Arab Rep. of France Germany, F. R. India I reland Netherlands Portugal Romania South Africa, Rep. of Spain Switzerland United Kingdom USA USSR No member body expressed disapproval of the Internatio nal Organkation for Standardkation, 1981 Printed in Switzerland

3 INTERNATIONAL STANDARD ISO 4783/ (E) Industrial wire screens and woven wire cloth - Guide to the choice of aperture size and wire diameter combinations - Part 3 : Preferred combinations for pre-crimped or pressure-welded wire screens 1 Scope and field of application This part of ISO 4783 tabulates preferred combinations of aperture size and wire diameter for pre-crimped or pressure welded wire screens for industrial purposes which are taken from the general list of aperture/wire combinations given in ISO 4783/1. lt applies to wire screens of aperture size from 125 to 1 mm. NOTE - This is the first international Standard on pre-crimped or pressure welded wire screens for industrial purposes; these specifications are a compromise which takes account of existing national standards. ISO Member Bodies are earnestly requested to rationalize further in Order to reduce the number of wire diameters per aperture width within the next 5 years without excluding the Option of increasing the numbers of preferred apertures. Part 2 of this International Standard gives the preferred combinations for woven-wire cloth. 2 Ref eaences ISO 3, Preferred numbers - Series of preferred numbers. ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers. ISO 2194, Wire screens and plate screens for industria/ purposes - Nominal sizes of apertures. I SO 4782, Industrial wire screens and woven wire cloth - Diameters o f metal wire. ISO 4789, Industrial wire screens and woven wire cloth - Guide to the choice of aperture size and wire diameter combina tions Part I : Generalities. Part 2 : Preferred combinations for woven wire cloth. 1

4 ISO 4783/ (E) 3 Designation 4 Aperture size and wire diameter combinations Pre-crimped or pressure welded screens for industrial purposes shall be designated in the following sequence by a) width of aperture W; b) diameter of wire d; c) material of wire; d) type (see table 1). Table 2 lists the preferred combinations of aperture size and wire diameter for wire screens and states the open area A, and the mass per Square for each combination. 5 Mass per unit area The mass per unit of pre-crimped or pressure welded wire screens is given, in kilograms per Square metre, by the formula W= width of aperture d = diameter of wire = d2ef 618,l (w + d) 3 d w is the diameter of wire, in millimetres; is the width of aperture, in millimetres; i f is the Screen conversion factor; fz is the material density, in kilograms per cubic metre. Figure - Width of aperture and diameter of wire Values for f shall be taken from table 1. For wires of plain or carbon steel, Q = kg/m? For wires of stainless steel, Q = kg/m? 2

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