ISO 12625-12:2023
(Main)Tissue paper and tissue products — Part 12: Determination of tensile strength of perforated lines and calculation of perforation efficiency
Tissue paper and tissue products — Part 12: Determination of tensile strength of perforated lines and calculation of perforation efficiency
This document specifies a test method for the determination of the tensile strength of perforated lines of tissue paper. It uses a tensile-testing apparatus operating with a constant rate of elongation. This method is only used for measuring machine-direction tensile strength, that is for cross-direction perforations on tissue paper. The calculation of perforation efficiency is also specified in this document.
Papier tissue et produits tissue — Partie 12: Détermination de la résistance à la rupture par traction des lignes de prédécoupe et calcul de l'efficacité des perforations
Le présent document spécifie une méthode d’essai permettant de déterminer la résistance à la rupture par traction des lignes de prédécoupe du papier tissue. Cette méthode implique l’utilisation d’un appareil d’essai de traction fonctionnant à un gradient d’allongement constant. Cette méthode est utilisée uniquement pour mesurer la résistance à la rupture par traction dans le sens machine, c’est-à-dire pour des lignes de prédécoupe dans le sens travers du papier tissue. Le calcul de l’efficacité des perforations est également indiqué dans le présent document.
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INTERNATIONAL ISO
STANDARD 12625-12
Second edition
2023-05
Tissue paper and tissue products —
Part 12:
Determination of tensile strength of
perforated lines and calculation of
perforation efficiency
Papier tissue et produits tissue —
Partie 12: Détermination de la résistance à la rupture par traction
des lignes de prédécoupe et calcul de l'efficacité des perforations
Reference number
ISO 12625-12:2023(E)
© ISO 2023
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ISO 12625-12:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
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ISO 12625-12:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Sampling . 3
7 Conditioning . 3
8 Preparation of test pieces .3
8.1 Dimensions . 3
8.1.1 Non-perforated test pieces . 3
8.1.2 Perforated test pieces . 3
8.2 Number of test pieces . 3
9 Procedure .4
9.1 General . 4
9.2 Non-perforated test pieces . 4
9.3 Perforated test pieces . 4
10 Calculation . 6
10.1 Tensile strength . 6
10.2 Calculation of perforation efficiency . 6
11 Test report . 6
Annex A (informative) Influence of a pre-cut in the perforation line . 8
Annex B (informative) Influence of paper ageing .11
Annex C (informative) Precision .13
Bibliography .15
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ISO 12625-12:2023(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee
SC 2, Test methods and quality specifications for paper and board, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 172, Pulp, paper and board, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12625-12:2010), which has been
technically revised.
The main changes are as follows:
— the expression of the rate of elongation has been changed from a value expressed in mm/min into
a value expressed in the rate of elongation of the initial test span length in %/min, independently
from the test piece length (see 5.1);
— precisions have been added in case of decrease of the distance between the clamping lines (see 5.2).
A list of all parts in the ISO 12625 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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ISO 12625-12:2023(E)
Introduction
Tissue papers such as toilet paper and kitchen towel are often pre-cut. They are used after separation of
two consecutive sheets.
It is important to know the efficiency of the pre-cut perforations.
The perforation strength should be enough to ensure the product cohesion, but not too high, so that
sheets can be easily separated.
The method described in this document uses forces applied perpendicular to the perforation lines.
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INTERNATIONAL STANDARD ISO 12625-12:2023(E)
Tissue paper and tissue products —
Part 12:
Determination of tensile strength of perforated lines and
calculation of perforation efficiency
1 Scope
This document specifies a test method for the determination of the tensile strength of perforated lines
of tissue paper. It uses a tensile-testing apparatus operating with a constant rate of elongation.
This method is only used for measuring machine-direction tensile strength, that is for cross-direction
perforations on tissue paper.
The calculation of perforation efficiency is also specified in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 1924-2, Paper and board — Determination of tensile properties — Part 2: Constant rate of elongation
method (20 mm/min)
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 12625-1, Tissue paper and tissue products — Part 1: Vocabulary
ISO 12625-4, Tissue paper and tissue products — Part 4: Determination of tensile strength, stretch at
maximum force and tensile energy absorption
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12625-1 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
tensile strength
S
maximum tensile force per unit width that a test piece will withstand before breaking
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ISO 12625-12:2023(E)
3.2
perforation efficiency
E
p
difference between the tensile strengths (3.1) of non-perforated and perforated material from the same
sample divided by the tensile strength of non-perforated material
Note 1 to entry: The perforation efficiency is expressed as a percentage.
Note 2 to entry: The higher the perforation efficiency, the easier the sheet separation.
4 Principle
A perforated test piece of tissue paper or tissue product, of given dimensions, is stretched to break in
the machine direction at a constant rate of elongation using a tensile-testing apparatus that measures
and records the tensile force as a function of the elongation of the test piece.
From the recorded data, the tensile strength is calculated.
In order to determine the perforation efficiency, measurements are performed both on perforated and
non-perforated sections of the tissue product.
Precision data are available in Annex C. Information on the influence of a pre-cut and ageing is available
in Annexes A and B.
5 Apparatus
5.1 Tensile-testing apparatus.
The tensile-testing apparatus shall be in accordance with ISO 1924-2. It shall be capable of stretching
a test piece of tissue paper or tissue product of given dimensions, at a rate of elongation of (50 ± 2) %
of the initial test span length per minute, i.e. (50 ± 2) mm/min for a 100 mm test span length and
(25 ± 1) mm/min for a 50 mm test span length, and of recording the tensile force as a function of
elongation on a strip chart recorder or any equivalent device. The force-measuring system (normally a
load cell) shall measure loads with an accuracy of ±1 % of the reading or ±0,025 N, whichever is greater,
and shall conform with ISO 7500-1.
5.2 Tensile-tester clamps.
The tensile-testing apparatus shall have two clamps of at least 50 mm in width. Each clamp shall be
designed to grip the test piece firmly along a straight line across the full width of the test piece, without
causing any damage, and shall have means for adjusting the clamping force.
The clamps should preferably grip the test piece between a cylindrical and a flat surface, with the plane
of the test piece tangential to the cylindrical surface. Other types of clamps may be used if it can be
ensured that the test piece does not slip or suffer any damage during the test.
During the test, the clamping lines shall be parallel to each other within an angle of 1°. The clamping
lines shall be perpendicular to the direction of the applied tensile force and to the longest dimension of
the test piece to the same level of accuracy.
The distance between the clamping lines (i.e. the test span length) shall be adjusted to (100 ± 1) mm.
In cases where the distance between perf
...
NORME ISO
INTERNATIONALE 12625-12
Deuxième édition
2023-05
Papier tissue et produits tissue —
Partie 12:
Détermination de la résistance à la
rupture par traction des lignes de
prédécoupe et calcul de l'efficacité des
perforations
Tissue paper and tissue products —
Part 12: Determination of tensile strength of perforated lines and
calculation of perforation efficiency
Numéro de référence
ISO 12625-12:2023(F)
© ISO 2023
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ISO 12625-12:2023(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2023
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, 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, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
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ISO 12625-12:2023(F)
Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives .1
3 Termes et définitions . 1
4 Principe. 2
5 Appareillage . 2
6 Échantillonnage .3
7 Conditionnement .3
8 Préparation des éprouvettes . 3
8.1 Dimensions . 3
8.1.1 Éprouvettes non perforées . 3
8.1.2 Éprouvettes perforées . 3
8.2 Nombre d’éprouvettes . 4
9 Mode opératoire . 4
9.1 Généralités . 4
9.2 Éprouvettes non perforées . 4
9.3 Éprouvettes perforées . 4
10 Calculs . 6
10.1 Résistance à la rupture par traction . 6
10.2 Calcul de l’efficacité des perforations . 6
11 Rapport d’essai .7
Annexe A (informative) Incidence du prédécoupage d’une partie de la ligne de prédécoupe .8
Annexe B (informative) Incidence du vieillissement du papier .11
Annexe C (informative) Fidélité . .13
Bibliographie .15
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ISO 12625-12:2023(F)
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 (IEC) en ce qui
concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d’approbation requis pour les différents types de documents ISO. Le présent document a été
rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir
www.iso.org/directives).
L’ISO attire l’attention sur le fait que la mise en application du présent document peut entraîner
l’utilisation d’un ou de plusieurs brevets. L’ISO ne prend pas position quant à la preuve, à la validité
et à l’applicabilité de tout droit de brevet revendiqué à cet égard. À la date de publication du présent
document, l’ISO n’avait pas reçu notification qu’un ou plusieurs brevets pouvaient être nécessaires à sa
mise en application. Toutefois, il y a lieu d’avertir les responsables de la mise en application du présent
document que des informations plus récentes sont susceptibles de figurer dans la base de données de
brevets, disponible à l’adresse www.iso.org/brevets. L’ISO ne saurait être tenue pour responsable de ne
pas avoir identifié tout ou partie de tels droits de propriété.
Les appellations commerciales éventuellement mentionnées dans le présent document sont données
pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un
engagement.
Pour une explication de la nature volontaire des normes, la signification des termes et expressions
spécifiques de l’ISO liés à l’évaluation de la conformité, ou pour toute information au sujet de l’adhésion
de l’ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles
techniques au commerce (OTC), voir www.iso.org/avant-propos.
Le présent document a été élaboré par le comité technique ISO/TC 6, Papiers, cartons et pâtes, sous-
comité SC 2, Méthodes d’essais et spécifications de qualité des papiers et cartons, en collaboration avec
le comité technique CEN/TC 172, Pâtes, papier et carton, du Comité européen de normalisation (CEN)
conformément à l’Accord de coopération technique entre l’ISO et le CEN (Accord de Vienne).
Cette deuxième édition annule et remplace la première édition (ISO 12625-12:2010), qui a fait l’objet
d’une révision technique.
Les principales modifications sont les suivantes:
— remplacement du gradient d’allongement, exprimé en mm/min, par le gradient d’allongement de la
longueur d’essai initiale, exprimé en %/min, indépendamment de la longueur de l’éprouvette (voir
en 5.1);
— ajout de précisions pour les cas où la distance entre les lignes de serrage est réduite (voir en 5.2).
Une liste de toutes les parties de la série ISO 12625 se trouve sur le site web de l’ISO.
Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent
document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes
se trouve à l’adresse www.iso.org/fr/members.html.
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ISO 12625-12:2023(F)
Introduction
Les papiers tissue comme le papier-toilette et les essuie-tout ménagers sont souvent prédécoupés. Ils
sont utilisés après séparation de deux feuilles consécutives.
L’efficacité des perforations de prédécoupe est un paramètre important à connaître.
Il convient que la résistance de la prédécoupe soit suffisante pour assurer la cohésion du produit mais
qu’elle ne soit pas trop élevée afin que les feuilles puissent facilement être séparées.
La méthode décrite dans le présent document comprend l’application de forces perpendiculairement
aux lignes de prédécoupe.
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NORME INTERNATIONALE ISO 12625-12:2023(F)
Papier tissue et produits tissue —
Partie 12:
Détermination de la résistance à la rupture par traction
des lignes de prédécoupe et calcul de l'efficacité des
perforations
1 Domaine d’application
Le présent document spécifie une méthode d’essai permettant de déterminer la résistance à la rupture
par traction des lignes de prédécoupe du papier tissue. Cette méthode implique l’utilisation d’un
appareil d’essai de traction fonctionnant à un gradient d’allongement constant.
Cette méthode est utilisée uniquement pour mesurer la résistance à la rupture par traction dans le sens
machine, c’est-à-dire pour des lignes de prédécoupe dans le sens travers du papier tissue.
Le calcul de l’efficacité des perforations est également indiqué dans le présent document.
2 Références normatives
Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur
contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.
Pour les références non datées, la dernière édition du document de référence s’applique (y compris les
éventuels amendements).
ISO 186, Papier et carton — Échantillonnage pour déterminer la qualité moyenne
ISO 187, Papier, carton et pâtes — Atmosphère normale de conditionnement et d’essai et méthode de
surveillance de l’atmosphère et de conditionnement des échantillons
ISO 1924-2, Papier et carton — Détermination des propriétés de traction — Partie 2: Méthode à gradient
d’allongement constant (20 mm/min)
ISO 7500-1, Matériaux métalliques — Étalonnage et vérification des machines pour essais statiques
uniaxiaux — Partie 1: Machines d’essai de traction/compression — Étalonnage et vérification du système
de mesure de force
ISO 12625-1, Papier tissue et produits tissue — Partie 1: Vocabulaire
ISO 12625-4, Papier tissue et produits tissue — Partie 4: Détermination de la résistance à la rupture par
traction, de l’allongement à la force maximale et de l’énergie absorbée à la rupture par traction
3 Termes et définitions
Pour les besoins du présent document, les termes et les définitions de l’ISO 12625-1 ainsi que les
suivants s’appliquent.
L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en
normalisation, consultables aux adresses suivantes:
— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp
— IEC Electropedia: disponible à l’adresse https:// www .electropedia .org/
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ISO 12625-12:2023(F)
3.1
résistance à la rupture par traction
S
force de traction maximale par unité de largeur qu’une éprouvette peut supporter avant sa rupture
3.2
efficacité des perforations
E
p
différence entre les valeurs de la résistance à la rupture par traction (3.1) du matériau non perforé et du
matériau perforé d’un même échantillon, divisée par la résistance à la rupture par traction du matériau
non perforé
Note 1 à l'article: L’efficacité des perforations est exprimée par un pourcentage.
Note 2 à l'article: La séparation des feuilles est d’autant plus aisée que l’efficacité des perforations est élevée.
4 Principe
Une éprouvette perforée de papier tissue ou de produit tissue, de dimensions données, est étirée jusqu’à
la rupture dans le sens machine à un gradient d’allongement constant, en utilisant un appareil d’essai de
traction qui mesure et enregistre la force de traction en fonction de l’allongement de l’éprouvette.
La résistance à la rupture par traction est calculée à partir des données enregistrées.
Pour déterminer l’efficacité des perforations, les mesurages sont effectués sur des sections perforées et
sur des sections non perforées du produit tissue.
Des données de fidélité sont fournies à l’Annexe C. Les Annexes A et B donnent des informations sur
l’incidence d’une prédécoupe ainsi que du vieillissement.
5 Appareillage
5.1 Appareil d’essai de traction.
L’appareil d’essai de traction doit être conforme à l’ISO 1924-2. Il doit être conçu pour étirer une
éprouvette de papier tissue ou de produit tissue de dimensions données, à un gradient d’allongement
équivalent à (50 ± 2) % de la longueur d’essai initiale par minute, soit (50 ± 2) mm/min et (25 ± 1) mm/
min pour des longueurs d’essai de respectivement 100 mm et 50 mm. Il doit également pouvoir
enregistrer la force de traction en fonction de l’allongement au moyen d’un enregistreur à bande
déroulante ou d’un dispositif équivalent. Le système de mesurage de la force (en général, une cellule de
charge) doit mesurer les charges avec une exactitude de ±1 % du relevé ou ±0,025 N, la plus grande des
deux valeurs étant retenue. Il doit également être conforme à l’ISO 7500-1.
5.2 Mâchoires de l’appareil d’essai de traction.
L’appareil d’essai de traction doit comporter deux mâchoires, d’une largeur d’au moins 50 mm. Chaque
mâchoire doit être conçue pour maintenir l’éprouvette fermement le long d’une ligne droite sur toute la
largeur de l’éprouvette, sans l’endommager, et doit comprendre un dispositif de réglage de la force de
serrage.
Il convient de préférence que les mâchoires maintiennent l’éprouvette entre une surface cylindrique
et une surface plane, le plan de l’éprouvette étant tangent à la surface cylindrique. D’autres types de
mâchoires peuvent être utilisés à condition que l’éprouvette ne glisse pas ou ne subisse aucun dommage
pendant l’essai.
Lors de l’essai, les lignes de serrage doivent être parallèles entre elles dans les limites d’un angle de 1°.
Les lignes de serrage doivent être perpendiculaires au sens de la force de traction appliquée et à la plus
grande dimension de l’éprouvette, avec le même niveau d’exactitude.
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ISO 12625-12:2023(F)
La distance entre les lignes de serrage (c’est-à-dire, la longueur d’essai) doit être réglée sur (100 ± 1) mm.
Lorsque la distance entre les perforations sur les produits finis inférieure à 150 mm (comme mentionné
en 8.1.2), une longueur d’essai de (50 ± 1) mm doit être utilisée. Si la distance entre les perforations
est inférieure à 75 mm, chaque éprouvette perforée doit mesurer (50 ± 0,5) mm de large et la longueur
maximale disponible dans le sens machine peut être utilisée.
Cet écart, ainsi que tout autre écart par rapport au mode opératoire spécifié, doivent être consignés
dans le rapport d’essai.
5.3 Dispositif de découpage.
Le dispositif de découpage doit répondre aux exigences de l’ISO 12625
...
© ISO 2023 – All rights reserved
2022-12-13
ISO/FDIS 12625-12:20222023(E)
Date: 2023-02-01
ISO TC 6/SC 2/WG 27
Secretariat: SIS
Tissue paper and tissue products — Part 12: Determination of
tensile strength of perforated lines — Calculationand calculation of
perforation efficiency
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ISO/FDIS 12625-12:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of
this publication may be reproduced or utilized otherwise in any form or by any means, electronic or
mechanical, including photocopying, or posting on the internet or an intranet, without prior written
permission. Permission can be requested from either ISO at the address below or ISO’s member body in the
country of the requester.
ISO Copyright Office
CP 401 • CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland.
ii © ISO 2023 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 12625-12:2023(E)
Contents
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Sampling . 3
7 Conditioning . 3
8 Preparation of test pieces . 3
8.1 Dimensions . 3
8.1.1 Non-perforated test pieces . 3
8.1.2 Perforated test pieces . 3
8.2 Number of test pieces . 4
9 Procedure . 4
9.1 General . 4
9.2 Non-perforated test pieces . 4
9.3 Perforated test pieces . 4
10 Calculation . 6
10.1 Tensile strength . 6
10.2 Calculation of perforation efficiency . 7
11 Test report . 7
Annex A (informative) Influence of a pre-cut in the perforation line . 8
Annex B (informative) Influence of paper ageing . 11
Annex C (informative) Precision . 13
Bibliography . 15
© ISO 2023 – All rights reserved iii
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ISO/FDIS 12625-12:2023(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any
patent rights identified during the development of the document will be in the Introduction and/or on
the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to the World
Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee
SC 2, Test methods and quality specifications for paper and board, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 172, Pulp, paper and board, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12625-12:2010), which has been
technically revised.
The main changes are as follows:
— the expression of the rate of elongation has been changed from a value expressed in mm/min into a
value expressed in the rate of elongation of the initial test span length in %/min, independently from
the test piece length (see 5.1).;
— a rate of elongation of the initial test span length per minute (%/min)”.
— precisions werehave been added in case of decrease of the distance between the clamping lines (see
5.2).
A list of all parts in the ISO 12625 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv © ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 12625-12:2023(E)
Introduction
Tissue papers such as toilet paper and kitchen towel are often pre-cut. They are used after separation of
two consecutive sheets.
It is important to know the efficiency of the pre-cut perforations.
The perforation strength should be enough to ensure the product cohesion, but not too high, so that
sheets can be easily separated.
The method described in this document uses forces applied perpendicular to the perforation lines.
© ISO 2023 – All rights reserved v
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 12625-12:2023(E)
Tissue paper and tissue products — Part 12: Determination of
tensile strength of perforated lines — Calculationand calculation
of perforation efficiency
1 Scope
This document specifies a test method for the determination of the tensile strength of perforated lines of
tissue paper. It uses a tensile-testing apparatus operating with a constant rate of elongation.
This method is only used for measuring machine-direction tensile strength, that is for cross-direction
perforations on tissue paper.
The calculation of perforation efficiency is also specified in this document.
2 Normative references -rearrange
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 1924-2, Paper and board — Determination of tensile properties — Part 2: Constant rate of elongation
method (20 mm/min)
ISO 7500- 1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO12625-1, Tissue paper and tissue products — Part 1: Vocabulary
ISO 12625-4, Tissue paper and tissue products — Part 4: Determination of tensile strength, stretch at
maximum force and tensile energy absorption
ISO 7500 1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
43 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12625--1 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
© ISO 2023 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/FDIS 12625-12:2023(E)
3.1
tensile strength
S
maximum tensile force per unit width that a test piece will withstand before breaking
3.2
perforation efficiency
E
p
difference between the tensile strengths (3.1) of non-perforated and perforated material from the same
sample divided by the tensile strength of non-perforated material
Note 1 to entry: The perforation efficiency is expressed as a percentage.
Note 2 to entry: The higher the perforation efficiency, the easier the sheet separation.
54 Principle
A perforated test piece of tissue paper or tissue product, of given dimensions, is stretched to break in the
machine direction at a constant rate of elongation using a tensile-testing apparatus that measures and
records the tensile force as a function of the elongation of the test piece.
From the recorded data, the tensile strength is calculated.
In order to determine the perforation efficiency, measurements are performed both on perforated and
non-perforated sections of the tissue product.
Precision data are available in Annex C. Information on the influence of a pre-cut and ageing is available
in Annexes A and B.
65 Apparatus
5.1 Tensile-testing apparatus.
The tensile-testing apparatus shall be in accordance with ISO 1924-2. It shall be capable of stretching a
test piece of tissue paper or tissue product of given dimensions, at a rate of elongation of (50 ± 2) % of
the initial test span length per minute, i.e. (50 ± 2) mm/min for a 100 mm test span length and
(25 ± 1) mm/min for a 50 mm test span length, and of recording the tensile force as a function of
elongation on a strip chart recorder or any equivalent device. The force-measuring system (normally a
load cell) shall measure loads with an accuracy of ± ±1 % of the reading or ± ±0,025 N, whichever is
greater, and shall conform with ISO 7500-1.
5.2 Tensile-tester clamps.
The tensile-testing apparatus shall have two clamps of at least 50 mm in width. Each clamp shall be
designed to grip the test piece firmly along a straight line across the full width of the test piece, without
causing any damage, and shall have means for adjusting the clamping force.
The clamps should preferably grip the test piece between a cylindrical and a flat surface, with the plane
of the test piece tangential to the cylindrical surface. Other types of clamps may be used if it can be
ensured that the test piece does not slip or suffer any damage during the test.
During the test, the clamping lines shall be parallel to each other within an angle of 1°. The clamping lines
shall be perpendicular to the direction of the applied tensile force and to the longest dimension of the test
piece to the same level of accuracy.
The distance between the clamping lines (i.e. the test span length) shall be adjusted to (100 ± 1) mm. In
cases where the distance between perforations on the finished products is less than 150 mm is not
2 © ISO 2023 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/FDIS 12625-12:2023(E)
possible (as required in 8.1.2), a test span length of (50 ± 1) mm shall be used. If distance between
perforation is less than 75 mm., then each perforated test piece shall be (50 ± 0,5) mm in width and the
maximum available length in the machine direction may be used.
This and other deviations from the specified procedure shall be recorded in the test report.
5.3 Cutting device.
The cutting device shall meet the requirements of ISO 12625-4 and shall produce test pieces
(50,0 ± 0,5) mm wide, with undamaged, straight, smooth and parallel edges.
76 Sampling
If the tests are being made to evaluate a lot, the sample shall be selected in accordance with ISO 186. If
the tests are being made on another type of sample, make sure the specimens taken are representative
of the sample received.
87 Conditioning
Condition the samples in accordance with ISO 187, unless otherwise agreed between the parties
concerned, and keep them in the standard atmosphere throughout
...
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 12625-12
ISO/TC 6/SC 2
Tissue paper and tissue products —
Secretariat: SIS
Voting begins on:
Part 12:
2023-02-15
Determination of tensile strength of
Voting terminates on:
perforated lines and calculation of
2023-04-12
perforation efficiency
Papier tissue et produits tissues —
Partie 12: Détermination de la résistance à la rupture par traction
des lignes de prédécoupe et calcul de l'efficacité des perforations
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 12625-12:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 1 ----------------------
ISO/FDIS 12625-12:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 12625-12
ISO/TC 6/SC 2
Tissue paper and tissue products —
Secretariat: SIS
Voting begins on:
Part 12:
Determination of tensile strength of
Voting terminates on:
perforated lines and calculation of
perforation efficiency
Papier tissue et produits tissues —
Partie 12: Détermination de la résistance à la rupture par traction
des lignes de prédécoupe et calcul de l'efficacité des perforations
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
ISO/CEN PARALLEL PROCESSING
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 12625-12:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
© ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023
---------------------- Page: 2 ----------------------
ISO/FDIS 12625-12:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Sampling . 3
7 Conditioning . 3
8 Preparation of test pieces .3
8.1 Dimensions . 3
8.1.1 Non-perforated test pieces . 3
8.1.2 Perforated test pieces . 3
8.2 Number of test pieces . 3
9 Procedure .4
9.1 General . 4
9.2 Non-perforated test pieces . 4
9.3 Perforated test pieces . 4
10 Calculation . 6
10.1 Tensile strength . 6
10.2 Calculation of perforation efficiency . 6
11 Test report . 6
Annex A (informative) Influence of a pre-cut in the perforation line . 8
Annex B (informative) Influence of paper ageing .11
Annex C (informative) Precision .13
Bibliography .15
iii
© ISO 2023 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 12625-12:2023(E)
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.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO’s adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 6, Paper, board and pulps, Subcommittee
SC 2, Test methods and quality specifications for paper and board, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 172, Pulp, paper and board, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 12625-12:2010), which has been
technically revised.
The main changes are as follows:
— the expression of the rate of elongation has been changed from a value expressed in mm/min into
a value expressed in the rate of elongation of the initial test span length in %/min, independently
from the test piece length (see 5.1);
— precisions have been added in case of decrease of the distance between the clamping lines (see 5.2).
A list of all parts in the ISO 12625 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
© ISO 2023 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 12625-12:2023(E)
Introduction
Tissue papers such as toilet paper and kitchen towel are often pre-cut. They are used after separation of
two consecutive sheets.
It is important to know the efficiency of the pre-cut perforations.
The perforation strength should be enough to ensure the product cohesion, but not too high, so that
sheets can be easily separated.
The method described in this document uses forces applied perpendicular to the perforation lines.
v
© ISO 2023 – All rights reserved
---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 12625-12:2023(E)
Tissue paper and tissue products —
Part 12:
Determination of tensile strength of perforated lines and
calculation of perforation efficiency
1 Scope
This document specifies a test method for the determination of the tensile strength of perforated lines
of tissue paper. It uses a tensile-testing apparatus operating with a constant rate of elongation.
This method is only used for measuring machine-direction tensile strength, that is for cross-direction
perforations on tissue paper.
The calculation of perforation efficiency is also specified in this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 186, Paper and board — Sampling to determine average quality
ISO 187, Paper, board and pulps — Standard atmosphere for conditioning and testing and procedure for
monitoring the atmosphere and conditioning of samples
ISO 1924-2, Paper and board — Determination of tensile properties — Part 2: Constant rate of elongation
method (20 mm/min)
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 12625-1, Tissue paper and tissue products — Part 1: Vocabulary
ISO 12625-4, Tissue paper and tissue products — Part 4: Determination of tensile strength, stretch at
maximum force and tensile energy absorption
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12625-1 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
tensile strength
S
maximum tensile force per unit width that a test piece will withstand before breaking
1
© ISO 2023 – All rights reserved
---------------------- Page: 6 ----------------------
ISO/FDIS 12625-12:2023(E)
3.2
perforation efficiency
E
p
difference between the tensile strengths (3.1) of non-perforated and perforated material from the same
sample divided by the tensile strength of non-perforated material
Note 1 to entry: The perforation efficiency is expressed as a percentage.
Note 2 to entry: The higher the perforation efficiency, the easier the sheet separation.
4 Principle
A perforated test piece of tissue paper or tissue product, of given dimensions, is stretched to break in
the machine direction at a constant rate of elongation using a tensile-testing apparatus that measures
and records the tensile force as a function of the elongation of the test piece.
From the recorded data, the tensile strength is calculated.
In order to determine the perforation efficiency, measurements are performed both on perforated and
non-perforated sections of the tissue product.
Precision data are available in Annex C. Information on the influence of a pre-cut and ageing is available
in Annexes A and B.
5 Apparatus
5.1 Tensile-testing apparatus.
The tensile-testing apparatus shall be in accordance with ISO 1924-2. It shall be capable of stretching
a test piece of tissue paper or tissue product of given dimensions, at a rate of elongation of (50 ± 2) %
of the initial test span length per minute, i.e. (50 ± 2) mm/min for a 100 mm test span length and
(25 ± 1) mm/min for a 50 mm test span length, and of recording the tensile force as a function of
elongation on a strip chart recorder or any equivalent device. The force-measuring system (normally a
load cell) shall measure loads with an accuracy of ±1 % of the reading or ±0,025 N, whichever is greater,
and shall conform with ISO 7500-1.
5.2 Tensile-tester clamps.
The tensile-testing apparatus shall have two clamps of at least 50 mm in width. Each clamp shall be
designed to grip the test piece firmly along a straight line across the full width of the test piece, without
causing any damage, and shall have means for adjusting the clamping force.
The clamps should preferably grip the test piece between a cylindrical and a flat surface, with the plane
of the
...
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