ISO INTERNATIONAL STANDARD 7805-2 First edition 1987-12-01 INTERNATIONAL. ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEKAYHAPOAHAAOPIAHM3ALMANOCTAHAAPTW3AMM Industrial plate screens Part 2 : Thickness below 3 mm Toles perforees pour tamisage industriel -- Partie 2 : Epaisseur inferieure a3 mm Referencenumber ISO 7805-2 : 1987 (E) CopyrightIntemaionalOganizationfor Standadization No reproduction or networking permited without license from IHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through isO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. international organizations, govern- mental and non-governmentai, 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7805-2 was prepared by Technical Committee ISO/TC 24, Sieves,sievingand othersizingmethods. Users should note that all International Standards undergo revision from timeto time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. InternationalOrganizationforStandardization,1987 Printed in Switzerland Copyright IntemationalOrganizationfor Standardization No reproduction or networking permited without license from IHs Not for Resale ISO 7805-2 : 1987 (E) INTERNATIONALSTANDARD Industrial plate screens Part 2 : Thickness below 3 mm O Introduction 2 References The purpose of Iso 7805 is to provide guidance for the ISO3,Preferrednumbers--Seriesofpreferrednumbers. development of national standards for industrial plate screens. IS0 2194, Wire screens and plate screens for industrial pur- poses - Nominal sizes of apertures. As both parts of Iso 7805 provide a diversity of choice, it is unlikely that every one of the many possible combinations of IsO 2395, Test sieves and test sieving - Vocabulary. size of hole, pitch and plate thickness will be manufactured. iso 7806, Industrial plate screens Codification for The selection for national standards for industrial plate screens designating perforations. should be made from those combinations which suit the products and screening methods in the country concerned. 3 Definitions Scope and field of application For the purposes of this part of ISO 7805, the definitions given in ISO 2395 and the following definition apply. This part of iso 7805 describes three patterns using round (cir- cular) and square perforations in plate of less than 3 mm open area : Ratio of the total area occupied by the holes to the thickness; the sizes of holes range downto 2 mm for square overall area of the perforated part of the plate. holes and to 0,5 mm for round holes. Five ratios of pitch to hole are specified which result in nominal open areas ranging from 4 Material and design about 60 % to 23 %. Tolerances for both hole and pitch are given. 4.1 Material NOTE - Industrial plate screens of thicknesses of 3 mm and above are dealt with in ISO 7805-1, Industrial plate screens -- Part 1 : Thickness The material of perforated plates less than 3 mm thick shall be of 3 mm and above. agreed by manufacturer and purchaser. 1 No reproduction or networking pemited without license from IHS Not for Resale