Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity (paper backing) - Diffuse reflectance method (ISO 12625-16:2015)

ISO 12625-16:2015 specifies the testing procedures for the instrumental determination of the opacity of tissue paper or tissue products by diffuse reflectance using a paper backing.
ISO 12625-16:2015 contains specific instructions for the preparation of test pieces of single-ply and multi-ply products, where special preparation/procedures might be necessary.
It can be used to determine the opacity of tissue paper and tissue products containing fluorescent whitening agents, provided the UV content of the radiation incident on the test piece has been adjusted to conform to that in the CIE illuminant C using a fluorescent reference standard provided by an authorized laboratory as described in ISO 2470-1.
ISO 12625-16:2015 is not applicable to coloured tissue paper and tissue products which incorporate fluorescent dyes or pigments.

Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung der optischen Eigenschaften - Opazität über Papierstapel - Diffuser Reflexionsfaktor (ISO 12625-16:2015)

Papier tissue et produits tissue - Partie 16: Détermination des propriétés optiques - Opacité sur fond papier - Méthode par réflexion en lumière diffuse (ISO 12625-16:2015)

L'ISO 12625-16:2015 spécifie les procédures d'essai pour la détermination instrumentale de l'opacité des papiers tissue ou des produits tissue, par réflexion en lumière diffuse, en utilisant un fond papier.
Elle contient également des instructions spécifiques pour la préparation des éprouvettes des produits à pli unique et produits multiplis, lorsque des préparations/procédures spécifiques peuvent se révéler nécessaires.
Elle peut être utilisée pour déterminer l'opacité de papiers tissue ou de produits tissue contenant des agents d'azurage fluorescents, à condition que la teneur en UV du rayonnement incident sur l'éprouvette ait été ajustée pour être rendue conforme à celle de l'illuminant C de la CIE, à l'aide d'un étalon de référence fluorescent fourni par un laboratoire agréé, tel que décrit dans l'ISO 2470-1.
L'ISO 12625-16:2015 ne s'applique pas aux papiers tissue et produits tissue colorés, comprenant des colorants ou des pigments fluorescents.

Tissue papir in proizvodi iz tissue papirja - 16. del: Ugotavljanje optičnih lastnosti - Opaciteta (papirna podlaga) - Metoda razpršene odsevnosti (ISO 12625-16:2015)

General Information

Status
Published
Publication Date
17-Feb-2015
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
18-Feb-2015
Completion Date
18-Feb-2015

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SLOVENSKI STANDARD
SIST EN ISO 12625-16:2015
01-junij-2015

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2SDFLWHWD SDSLUQDSRGODJD 0HWRGDUD]SUãHQHRGVHYQRVWL ,62

Tissue paper and tissue products - Part 16: Determination of optical properties - Opacity

(paper backing) - Diffuse reflectance method (ISO 12625-16:2015)

Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung der optischen Eigenschaften -

Opazität über Papierstapel - Diffuser Reflexionsfaktor (ISO 12625-16:2015)

Papier tissue et produits tissues - Partie 16: Détermination des propriétés optiques -

Opacité sur fond papier - Méthode par réflexion en lumière diffuse (ISO 12625-16:2015)

Ta slovenski standard je istoveten z: EN ISO 12625-16:2015
ICS:
85.080.20 Tissue papir Tissue paper
SIST EN ISO 12625-16:2015 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 12625-16:2015
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SIST EN ISO 12625-16:2015
EUROPEAN STANDARD
EN ISO 12625-16
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2015
ICS 85.060
English Version
Tissue paper and tissue products - Part 16: Determination of
optical properties - Opacity (paper backing) - Diffuse reflectance
method (ISO 12625-16:2015)

Papier tissue et produits tissue - Partie 16: Détermination Tissue-Papier und Tissue-Produkte - Teil 16: Bestimmung

des propriétés optiques - Opacité sur fond papier - Méthode der optischen Eigenschaften - Opazität über Papierstapel -

par réflexion en lumière diffuse (ISO 12625-16:2015) Diffuser Reflexionsfaktor (ISO 12625-16:2015)

This European Standard was approved by CEN on 3 January 2015.

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

© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12625-16:2015 E

worldwide for CEN national Members.
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SIST EN ISO 12625-16:2015
EN ISO 12625-16:2015 (E)
Contents Page

Foreword ..............................................................................................................................................................3

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SIST EN ISO 12625-16:2015
EN ISO 12625-16:2015 (E)
Foreword

This document (EN ISO 12625-16:2015) 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 August 2015, and conflicting national standards shall be withdrawn at

the latest by August 2015.

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.

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 12625-16:2015 has been approved by CEN as EN ISO 12625-16:2015 without any

modification.
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SIST EN ISO 12625-16:2015
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SIST EN ISO 12625-16:2015
INTERNATIONAL ISO
STANDARD 12625-16
First edition
2015-02-15
Tissue paper and tissue products —
Part 16:
Determination of optical properties
— Opacity (paper backing) — Diffuse
reflectance method
Papier tissue et produits tissue —
Partie 16: Détermination des propriétés optiques — Opacité sur fond
papier — Méthode par réflexion en lumière diffuse
Reference number
ISO 12625-16:2015(E)
ISO 2015
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SIST EN ISO 12625-16:2015
ISO 12625-16:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015

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
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2015 – All rights reserved
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SIST EN ISO 12625-16:2015
ISO 12625-16:2015(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

5.1 Reflectometer ........................................................................................................................................................................................... 2

5.2 Reference standards ........................................................................................................................................................................... 3

5.3 Working standards .............................................................................................................................................................................. 3

5.4 Black cavity ................................................................................................................................................................................................ 3

6 Sampling ........................................................................................................................................................................................................................ 3

7 Conditioning .............................................................................................................................................................................................................. 3

8 Preparation of test pieces ........................................................................................................................................................................... 4

9 Procedure..................................................................................................................................................................................................................... 4

10 Calculation .................................................................................................................................................................................................................. 5

11 Test report ................................................................................................................................................................................................................... 5

Annex A (normative) Spectral characteristics of reflectometers for measuring luminous factor .......6

Annex B (informative) Precision ............................................................................................................................................................................... 8

Bibliography .............................................................................................................................................................................................................................10

© ISO 2015 – All rights reserved iii
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SIST EN ISO 12625-16:2015
ISO 12625-16:2015(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 WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information

ISO 12625-16 was prepared by 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 for quality specifications for paper and board, in accordance

with the Agreement on technical cooperation 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 and bulk

— 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 — Measurement of brightness and colour with D65/10°

(outdoor daylight)

— Part 8: Water-absorption time and water-absorption capacity, basket-immersion test method

— 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)

— Part 16: Determination of optical properties — Opacity (paper backing) — Diffuse reflectance method

iv © ISO 2015 – All rights reserved
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SIST EN ISO 12625-16:2015
ISO 12625-16:2015(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. Although optical properties

are intrinsic properties of tissue paper, they are not functional properties.

The opacity value depends on the principle used for its evaluation, and a method is to be chosen which

most closely relates to the interpretation to be placed upon the results. The method described in this

part of ISO 12625 is applicable when it is desired to measure that property of a tissue paper or tissue

product which governs the extent to which one sheet visually obscures print on underlying sheets. It

is not be confused with methods based on the reduction in a standard contrast by interposition of the

paper opacity (white backing), formerly known as contrast ratio, nor with the assessment of the amount

and condition of light penetrating a sheet (transparency or translucency).

The calculation of opacity requires luminance-factor data obtained by measurement under specified

conditions. The luminance factor depends on the conditions of measurement, and particularly on

the spectral and geometric characteristics of the instrument used for its determination. This part of

ISO 12625 is to be read in conjunction with ISO 2469.
© ISO 2015 – All rights reserved v
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SIST EN ISO 12625-16:2015
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SIST EN ISO 12625-16:2015
INTERNATIONAL STANDARD ISO 12625-16:2015(E)
Tissue paper and tissue products —
Part 16:
Determination of optical properties — Opacity (paper
backing) — Diffuse reflectance method
1 Scope

This part of ISO 12625 specifies the testing procedures for the instrumental determination of the opacity

of tissue paper or tissue products by diffuse reflectance using a paper backing.

This part of ISO 12625 contains specific instructions for the preparation of test pieces of single-ply and

multi-ply products, where special preparation/procedures might be necessary.

It can be used to determine the opacity of tissue paper and tissue products containing fluorescent

whitening agents, provided the UV content of the radiation incident on the test piece has been adjusted to

conform to that in the CIE illuminant C using a fluorescent reference standard provided by an authorized

laboratory as described in ISO 2470-1.

This part of ISO 12625 is not applicable to coloured tissue paper and tissue products which incorporate

fluorescent dyes or pigments.
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 (inc
...

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