OS1 7805/1 International Standard Industrial plate screens Part 1: Thickness of 3 mm and above Toles perforees pourtamisage industriel--Partie 1:Epaisseurégale ou superieurea3mm First edition - 1984-04-15 307805/1-1984 (E) UDC 621.928.028.2 Ref.No. ISO 7805/1-1984 (E) Descriptors:sieves,sieveplates,sizingscreens,holesize,designation. zation for Standardizatior Price based on 5 pages Noreproductionornetworking pemited without license fromIHS Not for Resale Foreword ISo (the: International Organization for Standardization) is a worldwide federation of national standards bodies (SO member bodies). The work of developing International Standards is carried out through ISO technical committees. Every member body 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 7805/1 was developed by Technical Committee ISO/TC 24, Sieves, sieving and other sizing methods, and was circulated to the member bodies in February1983. It has been approved by the member bodies of the following countries: Australia Italy Romania Canada ueder South Africa, Rep. of France Korea, Dem. P. Rep. of Switzerland Germany, F. R. Netherlands USSR India Portugal The member bodies of the following countries expressed disapproval of the document on technical grounds: Belgium United Kingdom International Organization for Standardization, 1984 Printed in Switzerland CopyrightIntemationalOrganizationforStandardization Not fr Resale ISO7805/1-1984(E) INTERNATIONAL STANDARD Industrial plate screens Part 1: Thickness of 3 mm and above 0 Introduction Definitions The purpose of this International Standard is to provide guid- For the purpose of this International Standard the definitions ance for the development of national standards for industrial given in iso 2395 and the following definition apply. plate screens. open area : Ratio of the total area occupied by the holes to the overall area of the perforated part of the plate. 1 Scope and field of application This part of ISo 7805 describes three patterns using round (cir- cular) and square perforations in low carbon steel piate of 3 mm Material and design thickness and above; the sizes of holes ranging from 125 to 3,15 mm inclusive. Five ratios of pitch to hote are prescribed which result in nominal areas ranging from about 64 to 23 %. Tolerances for both hole and pitch aregiven. 4.1 Material As this part of ISo 7805 provides a diversity of choice, it is The following requirements apply to perforated plates of low- unlikely that every one of the many possible combinations of carbon steel. Plates made of other steels and non-ferrous size of hole, pitch and plate thickness will be manufactured. metals may require different specifications apart from sizes of The selection for national standards for industrial plate screens holes. should be made from those combinations which suit the products and screening methods in the country concerned. Industrial plate screens of thicknesses below 3 mm are dealt 4.2 Design with in ISo 7805/2. 4.2.1 Arrangement of holes 2 References Three permissible arrangements of holes are illustrated in figures 1 to 3; figure 1 for round holes in an equilateral triangle ISo3,Preferrednumbers-Seriesofpreferrednumbers (60° staggered) arrangement; figures 2 and 3 for square holes in line or at half pitch stagger. Is0 2194, Wire screens and plate screens for industrial pur- poses -- Nominal sizes of apertures. 4.2.2 Size of holes w ISO 2395, Test sieves and test sieving - Vocabulary. The nominal sizes of round or square holes in industrial plate IS0 3310/2, Test sieves - Technical requirements and testing screens are tabulated in Iso 2194. Part2:Metalperforatedplate. First choice shall be made fro