ISO 7805-2:1987(en) Industrial plate screens — Part 2: Thickness below 3 mm
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. Esch member body interested in a subject for which a technical committee has been established hasthe right to be represented on that committee.International organizations, governmentaland 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. 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, sieving and other sizing methods.
Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.
1 Scope and field of application
This part of ISO 7805 describes three patterns using round (circular) and square perforations in plate of less than 3 mm thickness; the sizes of holes range down to 2 mm for square 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 about 60 % to 23 %. Tolerances for both hole and pitch are given.
NOTE — Industrial plate screens of thicknesses of 3 mm and above are dealt with in ISO 7805-1, Industrial plate screens — Part 1 : Thickness of 3 mm and above.
2 References
ISO 3, Preferred numbers — Series of preferred numbers.
ISO 2194, Wire screens and plate screens for industrial purposes — Nominal sizes of apertures.
ISO 2395, Test sieves and test sieving — Vocabulary.
ISO 7806, Industrial plate screens — Codification for designating perforations.
3 Definitions
For the purposes of this part of ISO 7805, the definitions given in ISO 2395 and the following definition apply.
open area
Ratio of the total area occupied by the holes to the overall area of the perforated part of the plate.
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