7806 (iSo International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATIONMEKAYHAPOAHAR OPFAHM3AUMH O CTAHAAPTM3AUWW+ORGANISATION INTERNATIONALE DE NORMALISATION Industrial plate screens - Codification for designating perforations Toles perforees pour tamisage industriel - Codification pour la désignation des perforations First edition - 1983-12-01 07806-1983 (E) UDC 621.928.028.2 Ref.No.1S07806-1983 (E) Descriptors : sieves, sieve plates, sizing screens, perforating, designation, codifications. Copyright International Organization for Standardization Price based on 5 pages No reproduction or networking per nitted without license from IHS Not for Resale Foreword ISo (the Internationat Organization for Standardization) is a worldwide federation of national standards bodies (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 authorized 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 theIsoCouncil. International Standard iSO 7806 was developed by Technical Committee iSO/TC 24, Sieves, sieving and other sizing methods, and was circulated to the member bodies in November1982. It has been approved by the member bodies of the following countries : Australia India South Africa, Rep. of Belgium Italy Spain Canada Japan Switzerland Egypt, Arab Rep. of Korea, Dem. P. Rep. of United Kingdom France Netherlands USSR Germany,F.R. Romania Nomemberbodyexpresseddisapproval ofthedocument International Organization for Standardization, 1983 Printed in Switzerland CyghmatinaganaiStandardizato No reproduction or networking permitted without license from IHS Not for Resale ISO 7806-1983 (E) INTERNATIONAL STANDARD Industrial plate screens -- Codification for designating perforations o Introduction NOTES Examples are given in figures 1 to 20 of each type of designation The system laid down in this International Standard codifies the To ensure easy readability of codifications, it is essential designation of perforated plate in order to facilitate com- to separate clearly codifications for hole and codifications for munication between purchaser and supplier. It is based on pitch, and manufacturers of perforated plate (EUROPERF). It is recom- to state codification magnitudes which are combined with "x" mended that this system be applied worldwide, in order to withoutspacing between. discourage the development and use of a diversity of national (See figures 7 to 14 and 17 to 20.) codes. 2 The purchaser should specifythe size, thickness and material of the perforated plate for his purpose in addition to the codification. 1 Scope and field of application Codification This International Standard specifies the code for designating 5.1 Shape of holes various kinds of perforations and their arrangements in per- forated plate. It applies to perforated plate regardless of the The shape of holes shall be designated by the following sym- plate material. bols : R : circular (round) 2 Reference C : square, with sides parallel to the edges of the plate Iso 2395, Test sieves and test sieving - Vocabulary. CD : square, with diagonals parallel to the 'edges of the plate Definitions H:hexagonal 3 For the purpose of this International Standard, the definitions LR : slots with round ends given in Iso 2395 apply. LC : slots with square ends 4 Designation The perforation of a plate is designated by shape of the holes; aperture size w, or aperture sizes wy and w2 in case of C CD slots; mutual arrangements of holes; pitch p, or pitches p and p2 in cases where the pitches are different in directions parallel to the edges of the plate; W2 W2 ori