EN ISO 12625-7:2007

SLOVENSKI STANDARD
01-julij-2007
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SIST EN 12625-7:2000
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Tissue paper and tissue products - Part 7: Determination of optical properties (ISO
12625-7:2007)
Tissue-Papier und Tissue-Produkte - Teil 7: Bestimmung der optischen Eigenschaften
(ISO 12625-7:2007)
Papier tissue et produits tissues - Partie 7: Détermination des propriétés optiques (ISO
12625-7:2007)
Ta slovenski standard je istoveten z: EN ISO 12625-7:2007
ICS:
85.080.20 Tissue papir Tissue paper
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12625-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2007
ICS 85.060 Supersedes EN 12625-7:2000
English Version
Tissue paper and tissue products - Part 7: Determination of
optical properties (ISO 12625-7:2007)
Papier tissue et produits tissues - Partie 7: Détermination Tissue-Papier und Tissue-Produkte - Teil 7: Bestimmung
des propriétés optiques (ISO 12625-7:2007) der optischen Eigenschaften (ISO 12625-7:2007)
This European Standard was approved by CEN on 17 February 2007.
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 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 Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-7:2007: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 12625-7:2007) has been prepared by Technical Committee CEN/TC
172 "Pulp, paper and board", the secretariat of which is held by DIN, in collaboration with
Technical Committee ISO/TC 6 "Paper, board and pulps".

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 September 2007, and conflicting national
standards shall be withdrawn at the latest by September 2007.

This document supersedes EN 12625-7:2000.

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, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United
Kingdom.
INTERNATIONAL ISO
STANDARD 12625-7
First edition
2007-03-01
Tissue paper and tissue products —
Part 7:
Determination of optical properties
Papier tissue et produits tissues —
Partie 7: Détermination des propriétés optiques

Reference number
ISO 12625-7:2007(E)
©
ISO 2007
ISO 12625-7:2007(E)
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ii © ISO 2007 – All rights reserved

ISO 12625-7:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 2
4 Apparatus . 3
5 Sampling and conditioning. 3
6 Preparation of test pieces. 4
7 Procedure . 4
8 Calculation. 6
9 Test report . 7
10 Precision. 8
Annex A (informative) Test methods available for the determination of optical properties . 9
Bibliography . 10

ISO 12625-7:2007(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.
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 12625-7 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 co-operation between ISO and CEN (Vienna Agreement).
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
⎯ Part 4: Determination of tensile strength, stretch at break and tensile energy absorption
⎯ Part 5: Determination of wet tensile strength
⎯ Part 6: Determination of grammage
⎯ Part 7: Determination of optical properties
⎯ Part 8: Water-absorption time and water-absorption capacity, basket-immersion test method
⎯ Part 9: Determination of ball burst strength

iv © ISO 2007 – All rights reserved

ISO 12625-7:2007(E)
Introduction
Optical measurements are affected by the geometry of the instruments used and by the texture of the material.
The design of the instrument to be used according to this part of ISO 12625, and the routine to be adopted for
its calibration, are specified in ISO 2469.
The optical properties are related to the visual appearance of the material. Therefore, although optical
properties are intrinsic properties of tissue paper, they are not functional properties. It is recommended that
agreement with respect to the properties to be measured is reached by the parties concerned, from case to
case. If it is desired to achieve a match with products based on other materials, for example, between table
napkins and candles, visual comparison may be essential.

INTERNATIONAL STANDARD ISO 12625-7:2007(E)

Tissue paper and tissue products —
Part 7:
Determination of optical properties
1 Scope
This part of ISO 12625 specifies test methods for the instrumental determination of optical properties of tissue
paper and tissue products. The various test methods that are available have been, or are being, developed as
International Standards. They are listed and explained in Annex A.
This part of ISO 12625 also gives recommendations regarding relevant optical properties to be measured for
different grades of tissue paper and tissue products and gives specific instructions for the preparation of test
pieces (single-ply, multi-ply products) and for the optical measurements of creped products and embossed
products, where special precautions may be necessary if the test-piece surfaces are uneven and if the
materials are bulky, so that air is entrapped between the sheets.
2 Normative references
The following referenced documents are indispensable for the application 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 2469, Paper, board and pulps — Measurement of diffuse reflectance factor
ISO 2470:1999, Paper and board — Measurement of diffuse blue reflectance factor (ISO brightness)
ISO 2471, Paper and board — Determination of opacity (paper backing) — Diffuse reflectance method
ISO 5631, Paper and board — Determination of colour (C/2°) — Diffuse reflectance method
ISO 11475, Paper and board — Determination of CIE whiteness, D65/10° (outdoor daylight)
ISO 11476, Paper and board — Determination of CIE whiteness, C/2° (indoor illumination conditions)
ISO 12625-7:2007(E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
reflectance factor
R
ratio of the radiation reflected by a body to that reflected by the perfect reflecting diffuser under the same
conditions of illumination and detection
NOTE 1 The reflectance factor is expressed as a percentage.
NOTE 2 The reflectance factor is influenced by the backing if the body is translucent.
3.2
diffuse reflectance factor
R
ratio of the reflection from a body to that reflected by the perfect reflecting diffuser under the same conditions
of diffuse illumination and normal detection
NOTE The ratio is often expressed as a percentage.
3.3
intrinsic reflectance factor
R
∞
reflectance factor of a layer or pad of material thick enough to be opaque, i.e. such that increasing the
thickness of the pad by doubling the number of sheets leads to no change in the measured reflectance factor
NOTE Adapted from ISO 2469:1994.
3.4
luminous reflectance factor
R
y
[1]
reflectance factor defined with reference to the CIE illuminant C, described in CIE Publication 15.2 and the
[2]
CIE 1931 colour-matching function y (l) (described in ISO/CIE 10527 ), and corresponding to the attribute
of visual perception of the reflecting surface
NOTE Adapted from ISO 2471:1998.
3.5
single-sheet luminous reflectance factor
R
luminous reflectance factor of a single sheet of paper with a black cavity as backing
[ISO 2471:1998]
3.6
diffuse blue reflectance factor
ISO brightness
R
intrinsic reflectance factor measured with a reflectometer having the characteristics described in ISO 2469,
Annex A, equipped with a fil
...