ISO 7805-1:1984(en) Industrial plate screens — Part 1: Thickness of 3 mm and above
Foreword
ISO (the International 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 the ISO Council.
International Standard ISO 7805/1 was developed by Technical Committee ISO/TC24, Sieves, sieving and other sizing methods, and was circulated to the member bodies in February 1983.
It has been approved by the member bodies of the following countries :
| Australia | Italy | Romania |
| Canada | Japan | South Africa, |
| 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
1 Scope and field of application
This part of ISO 7805 describes three patterns using round (circular) and square perforations in low carbon steel plate of 3 mm thickness and above; the sizes of holes ranging from 125 to 3,15 mm inclusive. Five ratios of pitch to hole are prescribed which result in nominal areas ranging from about 64 to 23 %. Tolerances for both hole and pitch are given.
As this part of ISO 7805 provides a diversity of choice, it is unlikely that every one of the many possible combinations of size of hole, pitch and plate thickness will be manufactured. The selection for national standards for industrial plate screens 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 with in ISO 7805/2.
2 References
ISO 3, Preferred numbers — Series of preferred numbers.
ISO 2194, Wire screens and piate screens for industrial purposes — Nominal sizes of apertures.
ISO 2395, Test sieves and test sieving — Vocabulary.
ISO 3310/2 ,Test sieves — Technical requirements and testing — Part 2: Metal perforated piate.
ISO 7805/2, Industrial piate screens — Part 2: Thickness below
ISO 7806, Industrial piate screens — Codification for designating perforations.
3 Definitions
For the purpose of this International Standard 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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