ISO 14315:1997

Industrial wire screens - Technical requirements and testing

Tissus métalliques préformés ou soudés — Exigences techniques et vérifications

Industrijska žična sita - Tehnične zahteve in preskušanja

General Information

• Status: Published
• Publication Date: 22-Oct-1997
• ICS: 73.120 - Equipment for processing of minerals
• Technical Committee: ISO/TC 24/SC 8 - Test sieves, sieving and industrial screens
• Drafting Committee: ISO/TC 24/SC 8/WG 2 - Industrial wire cloth
• Current Stage: 9093 - International Standard confirmed
• Start Date: 25-Nov-2022
• Completion Date: 13-Dec-2025
• Ref Project: SIST ISO 14315:2000 - Industrial wire screens -- Technical requirements and testing

Overview

ISO 14315:1997 - "Industrial wire screens - Technical requirements and testing" specifies terminology, tolerances, material requirements and test methods for pre‑crimped or pressure‑welded industrial wire screens used for screening operations. It applies to screens made from high‑tensile steel, stainless steel or other weavable metals (not to woven wire cloth covered by ISO 4783‑2). The standard also defines inspection documentation, ordering information and delivery conditions for rolls and cut‑to‑size screening surfaces.

Key topics and technical requirements

• Terminology and geometry: definitions for aperture width (w), wire diameter (d), pitch (p), warp/weft, open screening area and mass per unit area.
• Tolerances on aperture width: two tolerance classes - Y for average aperture deviation (± Y) and X for maximum single‑aperture positive deviation. Specific tolerance values depend on nominal aperture sizes (see standard tables).
• Wire diameter: pre‑weaving tolerances per ISO 4782; after weaving the diameter is untoleranced and must be measured per the test methods in ISO 14315.
• Permissible blemishes: defined maximum number of major manufacturing blemishes per unit area, with separate provisions for cut‑to‑size pieces. Minor blemishes are acceptable unless they affect aperture size or surface quality.
• Screening surface tolerances: dimensional tolerances for rectangular screening surfaces, with and without hook strips (side or end tensioning), including parallelism and hook strip length rules.
• Materials: allowable materials include high‑tensile steel (carbon content 0.37–0.85 %, tensile strength range indicated in the standard), stainless steel (specified by purchaser) or other agreed metals. Calculated mass per unit area is provided (actual mass may be up to 3 % lower).
• Test methods: measurement procedures for wire diameter (micrometer/dial gauge), average aperture (measuring spans of multiple pitches) and maximum aperture size, plus margins to be disregarded at roll edges.
• Inspection documents: statement of compliance, supplier test report, optional inspection certificate, chemical analysis and other agreed tests.
• Ordering and delivery: essential order details (quantity, aperture size, wire diameter, material, weave type, tolerances), roll length/width tolerances, and labelling/packing requirements.

Applications and users

ISO 14315 is used by:

• Manufacturers of industrial wire screens and screen components
• Screening equipment designers and OEMs specifying screening media
• Quality control laboratories performing acceptance testing and inspection
• Purchasers and end‑users in industries performing mechanical screening (mining, aggregates, recycling, mineral processing, chemical and food screening applications) who need clear specifications for performance and interchangeability

Related standards

• ISO 2194 - nominal sizes of apertures
• ISO 4782 - metal wire for wire screens
• ISO 4783‑1 and ISO 4783‑3 - guidance on aperture/wire combinations and preferred combinations for pre‑crimped or pressure‑welded screens
• (Referenced update) ISO 9044 - industrial woven wire cloth

Keywords: ISO 14315:1997, industrial wire screens, aperture width, wire diameter, test methods, tolerances, screening surfaces, hook strips, inspection certificate.

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2000
,QGXVWULMVNDåLþQDVLWD7HKQLþQH]DKWHYHLQSUHVNXãDQMD
Industrial wire screens -- Technical requirements and testing
Tissus métalliques préformés ou soudés -- Exigences techniques et vérifications
Ta slovenski standard je istoveten z: ISO 14315:1997
ICS:
73.120 Oprema za predelavo rudnin Equipment for processing of
minerals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 14315
First edition
1997-11-01
Industrial wire screens — Technical
requirements and testing
Tissus métalliques préformés ou soudés — Exigences techniques et
vérifications
Reference number
AA
Contents
1 Scope .1
2 Normative references .1
3 Definitions .2
4 Requirements.3
5 Test methods.8
6 Inspection documents.10
7 Ordering information.10
8 Delivery .11
©  ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
©
ISO
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, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 14315 was prepared by Technical Committee ISO/TC 24, Sieves, sieving and other
sizing methods, Subcommittee SC 3, Industrial wire screens.
iii
©
INTERNATIONAL STANDARD   ISO ISO 14315:1997(E)
Industrial wire screens – Technical requirements and
testing
1 Scope
This International Standard defines terms regarding metal wire screens for industrial screening purposes and
specifies tolerances, requirements and test methods.
It is applicable to pre-crimped or pressure-welded wire screens in accordance with ISO 4783-3, made of high-
tensile steel, stainless steel or other metal wires.
This International Standard is not applicable to industrial wire cloth in accordance with ISO 4783-2 (see
1)
ISO 9044:— , Industrial woven wire cloth — Technical requirements and testing).
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 2194:1972, Wire screens and plate screens for industrial purposes — Nominal sizes of apertures.
ISO 4782:1989, Metal wire for wire screens and industrial wire cloth.
ISO 4783-1:1989, Industrial wire screens and industrial wire cloth — Guide to the choice of aperture size and wire
diameter combinations — Part 1: Generalities.
ISO 4783-3:1981, Industrial wire screens and industrial wire cloth — Guide to the choice of aperture size and wire
diameter combinations — Part 3: Preferred combinations for pre-crimped or pressure-welded wire screens.

1)  To be published. (Revision of ISO 9044:1990)
©
ISO
Figure 1 — Aperture width, wire diameter and pitch
3 Definitions
For the purposes of this International Standard, the following definitions apply.
3.1 aperture width, w
distance between two adjacent warp or weft wires, measured in the projected plane at mid positions (see figure 1)
3.2 wire diameter, d
diameter of the wire in the wire screen (see figure 1)
NOTE —  The wire diameter may be altered slightly during the manufacturing process of the wire screen.
3.3 pitch, p
1) distance between the middle points of two adjacent wires
2) nominally the sum of the aperture width w and the wire diameter d (see figure 1)
3.4 warp
all wires running lengthwise in the screen as manufactured
3.5 weft
all wires running crosswise in the screen as manufactured
3.6 number of apertures per unit length, n
number of apertures which are counted in a row, one behind the other on a given unit length
3.7 open screening area, A
o
1) percentage of the surface of all the apertures in the total screening surface
2) ratio of the square of the nominal aperture width w and the square of the nominal pitch p
p = (w+d), rounded to a full percentage value:
w
A = 100 (1)
o
()wd+
©
ISO
3.8 type of screen
way in which the warp and weft wires are pre-crimped or connected to each other to form the screen (see
ISO 4783-3:1981, table 1)
3.9 firmness of industrial wire screen
tension existing between the crossing warp and weft wires and which, together with the interlocking, determines the
firmness of the wire screen
NOTE —  It is affected by the tensile strength of the material, by the relationship of w to d, and by the type and the depth of the
crimp.
3.10 mass per unit area, ρ
A
That quantity calculated using the following equation:
df��r
ρ = (2)
A
618,1�+()wd
where
d is the wire diameter, in millimetres;
w is the aperture width, in millimetres;
f is the type conversion factor (see ISO 4783-3:1981, table 1);
ρ is the material density, in kilograms per cubic metre (see ISO 4783-1:1989, table 2).
NOTE —  Equation (2) gives the calculated mass per unit area (kg/m ), although the actual value can be up to 3 % lower.
3.11 major blemishes
production defects which significantly affect the aperture size or surface quality of the wire screen
4 Requirements
For requirements on aperture widths, on the metal wire and on aperture width/wire diameter combinations for wire
screens, see ISO 2194, ISO 4782, ISO 4783-1 and ISO 4783-3.
4.1 Tolerance on wire diameter
Prior to weaving, the tolerance on wire diameter shall be as specified in ISO 4782. The weaving process normally
distorts the wire and affects its diameter. After weaving, the diameter of the wire is untoleranced. The wire diameter
shall be measured as specified in 5.1.
4.2 Tolerances on aperture width
The tolerances on aperture width shall be as given in table 1.
NOTE In the following, the suffix "s" used with the symbols denotes "industrial wire screens".
4.2.1 Tolerance Y : Average aperture size
s
Y is the tolerance of the arithmetical mean value of the aperture widths measured and calculated separately in both
s
warp and weft directions. The arithmetical average aperture size shall not deviate from the nominal size by more
than ± Y .
s
©
ISO
4.2.2 Tolerance X : Maximum aperture size
s
No aperture size shall exceed the nominal size by more than the value X . This is the maximum permissible
s
deviation of a single aperture measured separately in both warp and weft directions.
Since, on the basis of experience, negative deviations of single aperture widths do not affect the screening process,
values for X have only positive deviations.
s
Table 1 — Tolerances on aperture width
Nominal aperture Tolerances on aperture
width w
...

INTERNATIONAL ISO
STANDARD 14315
First edition
1997-11-01
Industrial wire screens — Technical
requirements and testing
Tissus métalliques préformés ou soudés — Exigences techniques et
vérifications
Reference number
AA
Contents
1 Scope .1
2 Normative references .1
3 Definitions .2
4 Requirements.3
5 Test methods.8
6 Inspection documents.10
7 Ordering information.10
8 Delivery .11
©  ISO 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 • CH-1211 Genève 20 • Switzerland
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii
©
ISO
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, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 14315 was prepared by Technical Committee ISO/TC 24, Sieves, sieving and other
sizing methods, Subcommittee SC 3, Industrial wire screens.
iii
©
INTERNATIONAL STANDARD   ISO ISO 14315:1997(E)
Industrial wire screens – Technical requirements and
testing
1 Scope
This International Standard defines terms regarding metal wire screens for industrial screening purposes and
specifies tolerances, requirements and test methods.
It is applicable to pre-crimped or pressure-welded wire screens in accordance with ISO 4783-3, made of high-
tensile steel, stainless steel or other metal wires.
This International Standard is not applicable to industrial wire cloth in accordance with ISO 4783-2 (see
1)
ISO 9044:— , Industrial woven wire cloth — Technical requirements and testing).
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 2194:1972, Wire screens and plate screens for industrial purposes — Nominal sizes of apertures.
ISO 4782:1989, Metal wire for wire screens and industrial wire cloth.
ISO 4783-1:1989, Industrial wire screens and industrial wire cloth — Guide to the choice of aperture size and wire
diameter combinations — Part 1: Generalities.
ISO 4783-3:1981, Industrial wire screens and industrial wire cloth — Guide to the choice of aperture size and wire
diameter combinations — Part 3: Preferred combinations for pre-crimped or pressure-welded wire screens.

1)  To be published. (Revision of ISO 9044:1990)
©
ISO
Figure 1 — Aperture width, wire diameter and pitch
3 Definitions
For the purposes of this International Standard, the following definitions apply.
3.1 aperture width, w
distance between two adjacent warp or weft wires, measured in the projected plane at mid positions (see figure 1)
3.2 wire diameter, d
diameter of the wire in the wire screen (see figure 1)
NOTE —  The wire diameter may be altered slightly during the manufacturing process of the wire screen.
3.3 pitch, p
1) distance between the middle points of two adjacent wires
2) nominally the sum of the aperture width w and the wire diameter d (see figure 1)
3.4 warp
all wires running lengthwise in the screen as manufactured
3.5 weft
all wires running crosswise in the screen as manufactured
3.6 number of apertures per unit length, n
number of apertures which are counted in a row, one behind the other on a given unit length
3.7 open screening area, A
o
1) percentage of the surface of all the apertures in the total screening surface
2) ratio of the square of the nominal aperture width w and the square of the nominal pitch p
p = (w+d), rounded to a full percentage value:
w
A = 100 (1)
o
()wd+
©
ISO
3.8 type of screen
way in which the warp and weft wires are pre-crimped or connected to each other to form the screen (see
ISO 4783-3:1981, table 1)
3.9 firmness of industrial wire screen
tension existing between the crossing warp and weft wires and which, together with the interlocking, determines the
firmness of the wire screen
NOTE —  It is affected by the tensile strength of the material, by the relationship of w to d, and by the type and the depth of the
crimp.
3.10 mass per unit area, ρ
A
That quantity calculated using the following equation:
df��r
ρ = (2)
A
618,1�+()wd
where
d is the wire diameter, in millimetres;
w is the aperture width, in millimetres;
f is the type conversion factor (see ISO 4783-3:1981, table 1);
ρ is the material density, in kilograms per cubic metre (see ISO 4783-1:1989, table 2).
NOTE —  Equation (2) gives the calculated mass per unit area (kg/m ), although the actual value can be up to 3 % lower.
3.11 major blemishes
production defects which significantly affect the aperture size or surface quality of the wire screen
4 Requirements
For requirements on aperture widths, on the metal wire and on aperture width/wire diameter combinations for wire
screens, see ISO 2194, ISO 4782, ISO 4783-1 and ISO 4783-3.
4.1 Tolerance on wire diameter
Prior to weaving, the tolerance on wire diameter shall be as specified in ISO 4782. The weaving process normally
distorts the wire and affects its diameter. After weaving, the diameter of the wire is untoleranced. The wire diameter
shall be measured as specified in 5.1.
4.2 Tolerances on aperture width
The tolerances on aperture width shall be as given in table 1.
NOTE In the following, the suffix "s" used with the symbols denotes "industrial wire screens".
4.2.1 Tolerance Y : Average aperture size
s
Y is the tolerance of the arithmetical mean value of the aperture widths measured and calculated separately in both
s
warp and weft directions. The arithmetical average aperture size shall not deviate from the nominal size by more
than ± Y .
s
©
ISO
4.2.2 Tolerance X : Maximum aperture size
s
No aperture size shall exceed the nominal size by more than the value X . This is the maximum permissible
s
deviation of a single aperture measured separately in both warp and weft directions.
Since, on the basis of experience, negative deviations of single aperture widths do not affect the screening process,
values for X have only positive deviations.
s
Table 1 — Tolerances on aperture width
Nominal aperture Tolerances on aperture
width w width
+X
–Y s
s
mm % %
2,5 5
125 Ä w > 63
63 Ä w > 31,5
31,5 Ä w > 16 3,5 8
16 Ä w > 8 4 10
8 Ä w > 4 5 13
4 Ä w > 2 5 16
2 Ä w Ä 15 20
4.3 Permissible number of major blemishes
4.3.1  Wire screens cannot be produced commercially without there being some manufacturing blemishes. The
manufacturer and the customer shall agree upon the number and nature of major blemishes which are permissible
per unit area of the wire screen. The percentage of yield of the screen shall be agreed o
...

NORME ISO
INTERNATIONALE 14315
Première édition
1997-11-01
Tissus métalliques préformés ou soudés —
Exigences techniques et vérifications
Industrial wire screens — Technical requirements and testing
Numéro de référence
AA
Sommaire
1 Domaine d'application.1
2 Références normatives .1
3 Définitions .2
4 Exigences .3
5 Vérifications .8
6 Documents de contrôle.9
7 Informations relatives à la commande .10
©  ISO 1997
Droits de reproduction réservés. Sauf prescription différente, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque
forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'éditeur.
Organisation internationale de normalisation
Case postale 56 • CH-1211 Genève 20 • Suisse
Internet [e-mail]
X.400 c=ch; a=400net; p=iso; o=isocs; s=central
Imprimé en Suisse
ii
© ISO
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux de
normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général confiée aux
comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire partie du comité
technique créé à cet effet. Les organisations internationales, gouvernementales et non gouvernementales, en
liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec la Commission
électrotechnique internationale (CEI) en ce qui concerne la normalisation électrotechnique.
Les projets de Normes internationales adoptés par les comités techniques sont soumis aux comités membres pour
vote. Leur publication comme Normes internationales requiert l'approbation de 75 % au moins des comités
membres votants.
La Norme internationale ISO 14315 a été élaborée par le comité technique ISO/TC 24, Tamis, tamisage et autres
méthodes de séparation granulométrique, sous-comité SC 3, Toiles métalliques pour tamisage industriel.
iii
NORME INTERNATIONALE  © ISO ISO 14315:1997(F)
Tissus métalliques préformés ou soudés – Exigences
techniques et vérifications
1 Domaine d'application
La présente Norme internationale définit des termes propres aux tissus métalliques préformés ou soudés pour
tamisage industriel et prescrit les tolérances, les exigences et les méthodes de vérification.
Elle est applicable aux tamis réalisés en tissus métalliques préformés ou soudés sous pression conformément à
l'ISO 4783-3, fabriqués en fils d'acier à haute résistance, d'acier inoxydable ou en fils d'autres métaux.
La présente Norme internationale n'est pas applicable aux tissus métalliques industriels conformes à l'ISO 4783-2
1)
(voir l'ISO 9044:� , Tissus métalliques industriels � Exigences techniques et vérifications).
2 Références normatives
Les normes suivantes contiennent des dispositions qui, par suite de la référence qui en est faite, constituent des
dispositions valables pour la présente Norme internationale. Au moment de la publication, les éditions indiquées
étaient en vigueur. Toute norme est sujette à révision et les parties prenantes des accords fondés sur la présente
Norme internationale sont invitées à rechercher la possibilité d'appliquer les éditions les plus récentes des normes
indiquées ci-après. Les membres du CEI et de l'ISO possèdent le registre des Normes internationales en vigueur à
un moment donné.
ISO 2194:1991, Cribles et tamis industriels � Tissus métalliques, tôles perforées et feuilles électroformées �
Désignation et dimensions nominales des ouvertures.
ISO 4782:1987, Fils métalliques pour tamis et tissus métalliques industriels.
ISO 4783-1:1989, Tamis et tissus métalliques industriels � Guide pour le choix des combinaisons d'ouverture de
maille et de diamètre du fil � Partie 1: Généralités.
ISO 4783-3:1981, Tamis et tissus métalliques industriels � Guide pour le choix des combinaisons d'ouverture de
maille et de diamètre du fil � Partie 3: Combinaisons préférées pour tissus préformés ou tissus soudés sous
pression.
1) À publier. (Révision de l’ISO 9044:1990)
© ISO
Figure 1 — Ouverture de maille, diamètre de fil et entraxe
3 Définitions
Pour les besoins de la présente Norme internationale, les définitions suivantes s'appliquent.
3.1 ouverture de maille, w
distance entre deux fils de chaîne ou de trame adjacents, mesurée dans le plan de projection au milieu de la maille
(voir la figure 1)
3.2 diamètre de fil, d
diamètre du fil dans le tissu (voir la figure 1)
NOTE �  Le diamètre du fil peut être légèrement altéré pendant le processus de fabrication du tissu.
3.3 entraxe, p
1) distance entre les axes de deux fils adjacents
2) somme de l'ouverture de maille nominale, w, et du diamètre du fil nominal, d (voir la figure 1)
3.4 chaîne
ensemble des fils parallèles au sens d'avancement du tissu en cours de fabrication
3.5 trame
ensemble des fils perpendiculaires au sens d'avancement du tissu en cours de fabrication
3.6 nombre d'ouvertures par unité de longueur, n
nombre d'ouvertures comptées par rangées dans une unité de longueur donnée
3.7 pourcentage de vide, A
o
1) pourcentage de l'aire de toutes les ouvertures de maille dans l'aire totale du tissu
2) quotient du carré de l'ouverture de maille nominale, w, par le carré de l'entraxe nominal, p
p = (w + d), arrondi à un pourcentage entier
w
A = 100 . (1)
()wd +
© ISO
3.8 type du tissu
désignation du mode de préformage ou d'entrecroisement des fils de chaîne et trame constituant le tissu (voir
l'ISO 4783-3:1981, tableau 1)
3.9 rigidité du tissu métallique
tension existant entre les croisements des fils de chaîne et de trame qui, alliée à l'ancrage, détermine la tenue des
mailles du tissu métallique
NOTE �  Elle est influencée par la résistance à la traction du matériau, par le rapport existant entre w et d et par le type et la
hauteur d'ondulation des fils.
3.10 masse surfacique, r
A
grandeur calculée par la formule suivante:
��r f
d
r = . (2)
A
618,1(wd+ )
où
d est le diamètre du fil, en millimètres;
w est l'ouverture de maille, en millimètres;
f est le coefficient de conversion du type de tissu (voir l'ISO 4783-3:1981, tableau 1);
r est la masse volumique du matériau, en kilogrammes par mètre cube (voir l'ISO 4783-1:1989, tableau 2)
NOTE �  L'équation (2) donne la masse calculée par unité de surface (kg/m ) bien que la valeur réelle puisse être de 3 %
inférieure.
3.11 défaut majeur
défaut de fabrication qui affecte de façon significative les dimensions des ouvertures de maille ou la qualité de
surface du tissu métallique
4 Exigences
En ce qui concerne les exigences pour les ouvertures de maille, les fils métalliques et les combinaisons d'ouverture
de maille et de diamètre de fil des tissus métalliques, se référer à l'ISO 2194, l'ISO 4782, l'ISO 4783-1 et
l'ISO 4783-3.
4.1 Tolérances sur les diamètres de fil
Avant tissage, les tolérances sur les diamètres de fil doivent être conformes à l'ISO 4782. Le tissage tord le fil et
affecte son diamètre. Après tissage, le diamètre du fil n'est pas tolérancé. Le diamètre du fil doit être mesuré
conformément à 5.1.
4.2 Tolérances sur les ouvertures de maille
Les tolérances sur les ouvertures de maille doivent être conformes au tableau 1.
NOTE �  Dans la suite, l'indice "s" dénote des "tissus métalliques préformés ou soudés".
4.2.1 Tolérance Y : Ouverture de maille moyenne
s
Y est la tolérance sur la valeur moyenne arithmétique des ouvertures de maille mesurées et calculées séparément
s
dans les deux directions (chaîne et trame). L'ouverture de maille moyenne ne doit pas s'écarter de l'ouverture de
maille nominale de plus de – Y .
s
© ISO
4.2.2 Tolérance X : Ouverture de maille maximale
s
Aucune ouverture de maille ne doit excéder la valeur nominale de plus de X . C'est l'écart maximal admissible pour
s
une seule ouverture de maille mesurée séparément dans les deux directions (chaîne et trame).
Comme, par expérience, les écarts négatifs sur les ouvertures de maille seules n'affectent pas le résultat du
tamisage, les valeurs pour X n'ont que des écarts positifs.
s
Tableau 1 — Tolérances sur l'ouverture de maille
Ouverture de maille Tolérances sur l'ouverture de
nominale w maille
+ X
– Y s
s
mm %
%
2,5 5
125 > w > 63
63 > w > 31,5
3,5 8
31,5 > w > 16
16 > > 8 410
w
8 > w > 4 513
4 > w > 2 516
2 > w > 1 520
4.3 Nombre de défauts majeurs admissibles
4.3.1  Les tissus métalliques ne peuvent être réalisés sans quelques défauts de fabrication. Le fabricant et le client
doivent déterminer ensemble le nombre et la nature des défauts majeurs admissibles par unité de surface du tissu
métallique. Le pourcentage de rendement du tissu doit être déterminé d'un commun accord avec le client et varie
suivant la dimension de la partie de tissu métallique.
4.3.2 Sauf accord particulier, le nombre de défauts majeurs indiqué dans le tableau 2 ne doit pas être dépassé.
Tableau 2 — Nombre de défauts majeurs admissibles
Ouverture de maille Nombre maximal de
nominale w défauts majeurs par 10 m
m
...