SIST EN ISO 12625-5:2017
(Main)Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO 12625-5:2016)
Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO 12625-5:2016)
This document specifies a test method for the determination of the wet tensile strength of tissue paper
and tissue products after soaking with water, using a tensile-strength-testing apparatus operating with
a constant rate of elongation.
Currently, two types of tensile-strength-testing apparatus are commercially available, one where
the test piece is positioned vertically and, for the other, horizontally. This document applies for both.
For vertical tensile-strength-testing apparatus, a device which is held in the lower grip of the tensilestrength-
testing apparatus, called a Finch Cup, is used to achieve the wetting. For horizontal tensilestrength-
testing apparatus, the soaking device is placed between the clamps.
In cases where impurities and contraries have to be determined, ISO 15755[6] applies for these
detections in tissue paper and tissue products.
Tissue-Papier und Tissue-Produkte - Teil 5: Bestimmung der breitenbezogenen Nassbruchkraft (ISO 12625-5:2016)
Dieses Dokument legt ein Prüfverfahren zur Bestimmung der breitenbezogenen Nassbruchkraft von Tissue-Papier und Tissue-Produkten nach dem Wässern fest. Hierfür wird ein Zugprüfgerät eingesetzt, das mit konstanter Dehnungsgeschwindigkeit arbeitet.
Momentan sind zwei Arten von Zugprüfgeräten im Handel erhältlich. Bei der einen Art von Zugprüfgerät wird die Probe vertikal, bei der anderen horizontal positioniert. Diese Norm gilt für beide. Bei vertikalen Zugprüfgeräten erfolgt das Wässern mit Hilfe einer Vorrichtung, die in der unteren Klemme des Zugprüfgeräts eingespannt wird, der so genannten Finch-Eintauchvorrichtung. Bei horizontalen Zugprüfgeräten wird die Eintauchvorrichtung zwischen den Klemmen angeordnet.
In Fällen, in denen Unreinheiten und Verunreinigungen zu bestimmen sind, erfolgt deren Erkennung in Tissue-Papier und Tissue-Produkten nach ISO 15755 [6].
Papier tissue et produits tissue - Partie 5: Détermination de la résistance à la rupture par traction à l'état humide (ISO 12625-5:2016)
ISO 12625-5:2016 spécifie une méthode d'essai pour la détermination de la résistance à la rupture par traction à l'état humide du papier tissue et des produits tissue, après immersion dans l'eau, en utilisant un appareil d'essai de traction fonctionnant à une vitesse d'allongement constante.
Deux types d'appareils d'essai de traction sont actuellement commercialisés, l'un où l'éprouvette est placée à la verticale, et l'autre où l'éprouvette est placée à l'horizontale. Le présent document s'applique aux deux types d'appareils. Les appareils d'essai de traction à position verticale utilisent un dispositif maintenu dans la mâchoire inférieure, appelé dispositif d'immersion Finch, pour réaliser le mouillage. Dans le cas des appareils d'essai de traction en position horizontale, le dispositif d'immersion est placé entre les mâchoires.
Lorsque les impuretés et les défauts doivent être déterminés, l'ISO 15755[6] s'applique pour ces détections dans le papier tissue et les produits tissue.
Tissue papir in proizvodi iz tissue papirja - 5. del: Ugotavljanje mokre natezne trdnosti (ISO 12625-5:2016)
Ta dokument določa preskusno metodo za določanje mokre natezne trdnosti tissue papirja in proizvodov iz tissue papirja po namakanju v vodi, pri čemer se uporablja naprava za preskušanje natezne trdnosti, ki deluje s stalno hitrostjo raztezanja.
Na tržišču sta trenutno na voljo dve vrsti naprav za preskušanje natezne trdnosti: pri eni je preskusni kos postavljen navpično in pri drugi vodoravno. Ta dokument se uporablja za obe vrsti naprav.
Pri napravi, kjer se natezno trdnost preskuša navpično, močenje zagotavlja pripomoček, ki je v spodnjem primežu naprave in se imenuje Finch Cup. Pri napravi, kjer se natezno trdnost preskuša vodoravno, je naprava za namakanje nameščena med čeljustmi.
V primerih, ko je treba določiti nečistoče in nasprotja v tissue papirju in proizvodih iz tissue papirja, se uporablja standard ISO 15755 [6].
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 12625-5:2017
01-marec-2017
1DGRPHãþD
SIST EN ISO 12625-5:2005
Tissue papir in proizvodi iz tissue papirja - 5. del: Ugotavljanje mokre natezne
trdnosti (ISO 12625-5:2016)
Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO
12625-5:2016)
Tissue-Papier und Tissue-Produkte - Teil 5: Bestimmung der breitenbezogenen
Nassbruchkraft (ISO 12625-5:2016)
Papier tissue et produits tissue - Partie 5: Détermination de la résistance à la rupture par
traction à l'état humide (ISO 12625-5:2016)
Ta slovenski standard je istoveten z: EN ISO 12625-5:2016
ICS:
85.080.20 Tissue papir Tissue paper
SIST EN ISO 12625-5:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 12625-5:2017
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SIST EN ISO 12625-5:2017
EN ISO 12625-5
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2016
EUROPÄISCHE NORM
ICS 85.060 Supersedes EN ISO 12625-5:2005
English Version
Tissue paper and tissue products - Part 5: Determination
of wet tensile strength (ISO 12625-5:2016)
Papier tissue et produits tissue - Partie 5: Tissue-Papier und Tissue-Produkte - Teil 5:
Détermination de la résistance à la rupture par traction Bestimmung der breitenbezogenen Nassbruchkraft
à l'état humide (ISO 12625-5:2016) (ISO 12625-5:2016)
This European Standard was approved by CEN on 21 November 2016.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-5:2016 E
worldwide for CEN national Members.
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SIST EN ISO 12625-5:2017
EN ISO 12625-5:2016 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 12625-5:2017
EN ISO 12625-5:2016 (E)
European foreword
This document (EN ISO 12625-5:2016) has been prepared by Technical Committee ISO/TC 6 "Paper,
board and pulps" in collaboration with Technical Committee CEN/TC 172 “Pulp, paper and board” the
secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2017, and conflicting national standards shall be
withdrawn at the latest by June 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 12625-5:2005.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 12625-5:2016 has been approved by CEN as EN ISO 12625-5:2016 without any
modification.
3
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SIST EN ISO 12625-5:2017
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SIST EN ISO 12625-5:2017
INTERNATIONAL ISO
STANDARD 12625-5
Second edition
2016-12-01
Tissue paper and tissue products —
Part 5:
Determination of wet tensile strength
Papier tissue et produits tissue —
Partie 5: Détermination de la résistance à la rupture par traction à
l’état humide
Reference number
ISO 12625-5:2016(E)
©
ISO 2016
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SIST EN ISO 12625-5:2017
ISO 12625-5:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 12625-5:2017
ISO 12625-5:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Conditioning . 5
7 Preparation . 5
7.1 General . 5
7.2 Accelerated ageing (curing) . 5
7.3 Dimensions . 6
7.3.1 Vertical testing apparatus . 6
7.3.2 Horizontal testing apparatus . 6
7.4 Number of test pieces . 6
8 Procedure. 6
8.1 Calibration and adjustment of the testing apparatus . 6
8.2 Vertical test method . 7
8.2.1 Mounting the Finch Cup soaking device . 7
8.2.2 Measurement . 7
8.3 Horizontal test method . 8
8.3.1 Measurement . 8
9 Calculation . 9
9.1 General . 9
9.2 Wet tensile strength . 9
9.3 Wet tensile strength retention .10
10 Test report .10
Annex A (informative) Precision .11
Bibliography .15
© ISO 2016 – All rights reserved iii
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SIST EN ISO 12625-5:2017
ISO 12625-5:2016(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 on 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 the following URL: www.iso.org/iso/foreword.html.
This document was prepared by the European Committee for Standardization (CEN) Technical
Committee CEN/TC 172, Pulp, paper and board, in collaboration with ISO Technical Committee TC 6,
Paper, board and pulps, Subcommittee SC 2, Test methods and quality specifications for 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 12625-5:2005), which has been
technically revised with the following changes:
a) in Clause 7, a more detailed description of the preparation of the test pieces was included;
b) in Clause 8, the procedure for measurement was clarified;
c) in Clause 10, additional information is to be included in the test report;
d) more detailed precision data in Annex A;
e) this document has been editorially updated.
A list of all parts in the ISO 12625 series can be found on the ISO website.
iv © ISO 2016 – All rights reserved
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SIST EN ISO 12625-5:2017
INTERNATIONAL STANDARD ISO 12625-5:2016(E)
Tissue paper and tissue products —
Part 5:
Determination of wet tensile strength
1 Scope
This document specifies a test method for the determination of the wet tensile strength of tissue paper
and tissue products after soaking with water, using a tensile-strength-testing apparatus operating with
a constant rate of elongation.
Currently, two types of tensile-strength-testing apparatus are commercially available, one where
the test piece is positioned vertically and, for the other, horizontally. This document applies for both.
For vertical tensile-strength-testing apparatus, a device which is held in the lower grip of the tensile-
strength-testing apparatus, called a Finch Cup, is used to achieve the wetting. For horizontal tensile-
strength-testing apparatus, the soaking device is placed between the clamps.
[6]
In cases where impurities and contraries have to be determined, ISO 15755 applies for these
detections in tissue paper and tissue products.
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
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 terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
wet tensile strength
maximum tensile force per unit width that a test piece soaked with water will withstand before
breaking in a tensile test
Note 1 to entry: The wet tensile strength is expressed in newtons per metre (N/m).
© ISO 2016 – All rights reserved 1
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SIST EN ISO 12625-5:2017
ISO 12625-5:2016(E)
3.2
wet-tensile-strength retention
ratio, expressed as a percentage, of the tensile strength of the wet test piece to the tensile strength of a
different test piece from the same sample in the dry, conditioned state
Note 1 to entry: According to ISO 187.
4 Principle
A test piece of tissue paper or tissue product of given dimensions, soaked in water for a given period of
time under specified conditions, is stretched (elongated) to break at a constant rate of elongation, using
a tensile-strength-testing apparatus that measures and records the tensile force as a function of the
elongation of the test piece.
The test can be carried out by a vertical or a horizontal tensile-strength-testing apparatus.
In order to wet the test pieces for a vertical tensile-strength-testing apparatus, a device called a Finch
Cup, which is held to the lower clamp, is used. For a horizontal tensile-strength-testing apparatus, a
soaking cup is inserted between the clamps.
From the wet tensile strength and the tensile strength of the same sample in the dry conditioned state,
the wet-tensile-strength retention can be calculated.
Precision data are available in Annex A.
5 Apparatus
5.1 Vertical tensile-strength-testing apparatus
5.1.1 Tensile-strength-testing apparatus
The tensile-strength-testing apparatus shall be in accordance with ISO 1924-2. It is capable of stretching
a test piece of tissue paper or tissue product of given dimensions at a constant rate of elongation of
(50 ± 2) mm/min, and recording the tensile force as a function of elongation on a strip chart recorder or
any equivalent device.
The force-measuring system shall measure loads with an accuracy of ±1 % of the reading or ±0,1 N,
whichever is greater, and shall be calibrated and verified according to the requirements of ISO 7500-1.
5.1.2 Tensile-testing apparatus clamps
The tensile-strength-testing apparatus (5.1.1) shall have an upper clamp with a minimum of 50 mm
width, for holding both ends of the test piece firmly and without slippage. To avoid damaging the test
pieces, the clamp surfaces that touch the pieces should be smooth and have rounded edges, i.e. free
from burrs. The lower clamp shall be designed to grip the Finch Cup soaking device (5.1.3) firmly. The
clamps shall have means for adjusting the clamping force.
During the test, the upper clamping line and the Finch Cup soaking device (5.1.3) rod shall be parallel
to each other. They shall also be perpendicular to the direction of the applied tensile force and to the
length axis of the test piece.
The distance between A and B is the total span length and shall be (100 ± 1) mm. The distance between
A and B divided by two is the test span length and shall be (50 ± 1) mm.
2 © ISO 2016 – All rights reserved
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SIST EN ISO 12625-5:2017
ISO 12625-5:2016(E)
Dimensions in millimetres
Key
A clamping line on one end of the test piece
B clamping line on the other end of the test piece
Figure 1 — Positioning of a test piece
5.1.3 Finch Cup soaking device
A Finch Cup soaking device (see Figure 2) consists of a support system that holds a horizontal cylindrical
rod of (5,0 ± 0,1) mm diameter, and approximately 60 mm length, and a water container.
The water container shall be constructed such that it can be moved vertically and locked in a raised
position. In the locked raised position, the water in the container shall completely surround the
cylindrical rod which is thereby immersed in the liquid to a depth of (20 ± 1) mm, as indicated in
Figure 2.
Projecting downwards, from the bottom of the device, is a rigid metal tongue by means of which the
device can be held in the lower clamp of the tensile-strength-testing apparatus.
© ISO 2016 – All rights reserved 3
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SIST EN ISO 12625-5:2017
ISO 12625-5:2016(E)
Dimensions in millimetres
Key
1 liquid level mark
2 positioning groove
3 rod, d (5,0 ± 0,1) mm
4 water container (movable)
5 tongue
Figure 2 — Finch Cup soaking device (example)
5.2 Horizontal tensile-strength-testing apparatus
5.2.1 Tensile-strength-testing apparatus
The tensile-strength-testing apparatus shall be in accordance with ISO 1924-2. It is capable of stretching
a test piece of tissue paper or tissue product of given dimensions at a constant rate of elongation of
(50 ± 2) mm/min, and recording the tensile force as a function of elongation on a strip chart or any
equivalent device.
The force-measuring system shall measure loads with an accuracy of ±1 % of the reading or ±0,1 N,
whichever is greater. It shall be calibrated an
...
SLOVENSKI STANDARD
oSIST prEN ISO 12625-5:2015
01-september-2015
Tissue papir in proizvodi iz tissue papirja - 5. del: Ugotavljanje mokre natezne
trdnosti (ISO/DIS 12625-5:2015)
Tissue paper and tissue products - Part 5: Determination of wet tensile strength (ISO/DIS
12625-5:2015)
Tissue-Papier und Tissue-Produkte - Teil 5: Bestimmung der breitenbezogenen
Nassbruchkraft (ISO/DIS 12625-5:2015)
Papier tissue et produits tissue - Partie 5: Détermination de la résistance à la rupture par
traction à l'état humide (ISO/DIS 12625-5:2015)
Ta slovenski standard je istoveten z: prEN ISO 12625-5
ICS:
85.080.20 Tissue papir Tissue paper
oSIST prEN ISO 12625-5:2015 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 12625-5:2015
---------------------- Page: 2 ----------------------
oSIST prEN ISO 12625-5:2015
DRAFT INTERNATIONAL STANDARD
ISO/DIS 12625-5
ISO/TC 6/SC 2 Secretariat: SIS
Voting begins on: Voting terminates on:
2015-07-09 2015-10-09
Tissue paper and tissue products —
Part 5:
Determination of wet tensile strength
Papier tissue et produits tissue —
Partie 5: Détermination de la résistance à la rupture par traction à l’état humide
ICS: 85.060
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the European Committee for Standardization
(CEN), and processed under the CEN lead mode of collaboration as defined in the
Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments
received, will be submitted to a parallel two-month approval vote in ISO and
THIS DOCUMENT IS A DRAFT CIRCULATED
formal vote in CEN.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 12625-5:2015(E)
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 SUPPORTING DOCUMENTATION. ISO 2015
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oSIST prEN ISO 12625-5:2015
ISO/DIS 12625-5:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 12625-5:2015
ISO/DIS 12625-5
Contents Page
Foreword . iv
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle. 2
5 Apparatus . 2
5.1 Vertical tensile strength tester . 2
5.2 Horizontal tensile strength tester . 4
5.3 Cutting device . 5
6 Conditioning . 5
7 Preparation . 5
7.1 General . 5
7.2 Rapid ageing (curing) . 6
7.3 Dimensions . 6
7.4 Number of test pieces . 7
8 Procedure . 7
8.1 Calibration and adjustment of the tester . 7
8.2 Vertical test method . 7
8.3 Horizontal test method . 8
9 Calculation . 9
9.1 Wet tensile strength . 9
9.2 Wet tensile strength retention . 10
10 Test report . 10
Annex A (informative) Precision . 11
A.1 General . 11
A.2 Wet tensile strength . 12
A.2.1 Horizontal wet tensile strength machine direction . 12
A.2.2 Horizontal wet tensile strength cross direction . 13
A.2.3 Vertical wet tensile strength machine direction . 14
A.2.4 Vertical wet tensile strength cross direction . 15
Bibliography . 16
© ISO 2015 – All rights reserved iii
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oSIST prEN ISO 12625-5:2015
ISO/DIS 12625-5
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. 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.
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.
ISO 12625-5 was prepared by the European Committee for Standardization (CEN) Technical Committee
CEN/TC 172, Pulp, paper and board, in collaboration with Technical Committee ISO/TC 6, Paper, board and
pulps, Subcommittee SC 2, Test methods and quality specifications for paper and board, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (2005), which has been technically revised.
With regard to ISO 12625-5:2005, the following changes have been made:
a) more detailed description of the preparation of the test pieces (clause 7) was included;
b) procedure (clause 8) for the measurement was clarified;
c) additional information to be included in the test report (clause 10);
d) more detailed precision data (Annex A).
e) editorial updating.
ISO 12625 consists of the following parts, under the general title Tissue paper and tissue products:
Part 1: General guidance on terms;
Part 3: Determination of thickness, bulking thickness and apparent bulk density and bulk;
Part 4: Determination of tensile strength, stretch at maximum force and tensile energy absorption;
Part 5: Determination of wet tensile strength;
Part 6: Determination of grammage;
Part 7: Determination of optical properties — Measurement of brightness and colour with D65/10°
(outdoor daylight);
Part 8: Water absorption time and water absorption capacity — basket immersion test method;
iv © ISO 2015 – All rights reserved
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oSIST prEN ISO 12625-5:2015
ISO/DIS 12625-5
Part 9: Determination of ball burst strength;
Part 11: Determination of wet ball burst strength;
Part 12: Determination of tensile strength of perforated lines — Calculation of perforation efficiency;
Part 15: Determination of optical properties — Measurement of brightness and colour with C/2° (indoor
daylight) illuminant
Part 16: Determination of optical properties — Opacity (paper backing) - Diffuse reflectance method
© ISO 2015 – All rights reserved v
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oSIST prEN ISO 12625-5:2015
ISO/DIS 12625-5
Introduction
In cases that impurities and contraries have to be determined it is expressly stated that these detections in
tissue paper and tissue products should be applied in accordance with ISO 15755 [4].
For the determination of moisture content in tissue paper and tissue products, ISO 287 [1] and ISO 638 [2]
should be applied.
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oSIST prEN ISO 12625-5:2015
DRAFT INTERNATIONAL STANDARD ISO/DIS 12625-5
Tissue paper and tissue products — Part 5: Determination of
wet tensile strength
1 Scope
This part of EN ISO 12625 specifies a test method for the determination of the wet tensile strength of tissue
paper and tissue products after soaking with water, using a tensile strength testing apparatus operating with a
constant rate of elongation.
Currently, two types of tensile strength testers are commercially available, one where the test piece is positioned
vertically and for the other horizontally. This European Standard applies for both. For vertical tensile strength
testers, a device which is held in the lower grip of the tensile strength tester, called a Finch Cup, is used to
achieve the wetting. For horizontal tensile strength testers the soaking device is placed between the clamps.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 — Verification of uniaxial testing machines — Part 1: Tension/compression
testing machines — Verification and calibration of the force-measuring system
ISO 12625-1, Tissue paper and tissue products — Part 1: General guidance on terms
ISO 12625-4, Tissue paper and tissue products — Part 4: Determination of tensile strength, stretch at break
and tensile energy absorption
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oSIST prEN ISO 12625-5:2015
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12625-1 and the following apply.
3.1
wet tensile strength
maximum tensile force per unit width that a test piece soaked with water will withstand before breaking in a
tensile test
Note 1 to entry: The wet tensile strength is expressed in newtons per metre.
3.2
wet- tensile strength retention
ratio, expressed as a percentage, of the tensile strength of the wet test piece to the tensile strength of the
same test piece in the dry, conditioned state.
4 Principle
A test piece of tissue paper or tissue product of given dimensions, soaked in water for a given period of time
under specified conditions, is stretched (elongated) to break at a constant rate of elongation, using a tensile
strength testing apparatus that measures and records the tensile force as a function of the elongation of the test
piece.
The test can be carried out by a vertical or a horizontal tensile strength tester.
In order to wet the test pieces for a vertical tensile strength tester, a device, called Finch Cup, which is held to
the lower clamp, is used; while for a horizontal tensile strength tester a soaking cup is inserted between the
clamps.
From the wet tensile strength and the tensile strength of the same sample in the dry conditioned state, the wet
tensile strength retention can be calculated.
5 Apparatus
5.1 Vertical tensile strength tester
5.1.1 Tensile strength testing apparatus
The tensile strength testing apparatus shall be in accordance to ISO 1924-2. It is capable of stretching a test
piece of tissue paper or tissue product of given dimensions, at a constant rate of elongation of
(50 ± 2) mm/min and recording the tensile force as a function of elongation on a strip chart recorder or any
equivalent device.
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oSIST prEN ISO 12625-5:2015
ISO/DIS 12625-5
The force measuring system shall measure loads with an accuracy of ± 1 % of the reading or ± 0,1 N
whichever is the greater and shall be calibrated and verified conform to the requirements according to
ISO 7500-1.
5.1.2 Tensile tester clamps
The tensile strength testing apparatus (5.1.1) shall have an upper clamp with a minimum of 50 mm width, for
holding both ends of the test piece firmly and without slippage. To avoid damaging the test pieces, the clamp
surfaces that touch the pieces should be smooth and have rounded edges, i.e. free from burrs. The lower clamp
shall be designed to grip the Finch Cup soaking device (5.1.3) firmly. The clamps shall have means for adjusting
the clamping force.
During the test, the upper clamping line and the Finch Cup soaking device rod (5.1.3) shall be parallel to each
other. They shall also be perpendicular to the direction of the applied tensile force and to the length axis of the
test piece.
The test span length, which is defined as the distance between the clamping line and the top surface line of
the cylindrical rod of the Finch Cup soaking device, shall be (43,5 ± 1,0) mm (see figure 1).
Dimensions in millimetres
Figure 1 — Positioning of a test piece
Key
AB = (100 ± 2) mm
= total span length
AB
= (50 ± 1) mm
2
= test span length
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oSIST prEN ISO 12625-5:2015
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5.1.3 Finch Cup soaking device
A Finch Cup soaking device (see figure 2) that consists of a support system that holds a horizontal cylindrical
rod of (5,0 ± 0,1) mm diameter, and approximately 60 mm length, and a water container.
The water container shall be constructed such that it can be moved vertically and locked in a raised position. In
the locked raised position, the water in the container shall completely surround the cylindrical rod which is
thereby immersed in the liquid to a depth of (20 ± 1) mm, as indicated in the example of figure 2.
Projecting downwards, from the bottom of the device, is a rigid metal tongue by means of which the device
can be held in the lower clamp of the tensile strength testing apparatus.
Dimensions in millimetres
Key
1 liquid level mark
2 positioning groove
3 rod, d (5,0 ± 0,1) mm
4 water container (movable)
5 tongue
Figure 2 — Finch Cup soaking device (example)
5.2 Horizontal tensile strength tester
5.2.1 Tensile strength testing apparatus
The tensile strength testing apparatus shall be in accordance with ISO 1924-2. It is capable of stretching a test
piece of tissue paper or tissue product of given dimensions, at a constant rate of elongation of
(50 ± 2) mm/min, and recording the tensile force as a function of elongation on a strip chart or any equivalent
device.
The force measuring system shall measure loads with an accuracy of ± 1 % of the reading or ± 0,1 N
whichever is the greater. It shall be calibrated and verified to confirm the requirements according to ISO 7500-
1.
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5.2.2 Tensile tester clamps
The tensile strength tester shall have two clamps for holding the test piece. 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 table between the clamps must be
removable.
During the test, the clamping lines shall be parallel to each other within an angle of 1°. The
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