ISO 12625-18:2022

INTERNATIONAL ISO
STANDARD 12625-18
First edition
2022-10
Tissue paper and tissue products —
Part 18:
Determination of surface friction
Papier tissue et produits tissue —
Partie 18: Détermination du frottement superficiel
Reference number
© ISO 2022
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Friction-testing apparatus . 2
5.2 Stylus . 2
5.3 Drive unit . 2
5.4 Specimen holder . 2
5.4.1 Base plate . 2
5.4.2 Rectangular frame . 2
6 Sampling . 3
7 Conditioning of test pieces .3
8 Preparation of the test pieces . 3
8.1 General . 3
8.2 Number and dimensions . 3
9 Test procedure .4
10 Calculation and expression of the results . 4
10.1 General . 4
10.2 Reporting the results . 5
10.2.1 μ and M . 5
10.2.2 Standard deviation and coefficient of variation (COV) . 5
11 Test report . 5
Annex A (informative) Measurement principle of surface friction . 6
Annex B (informative) Precision data . 9
Bibliography .11
iii
Foreword
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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.
A list of all parts in the ISO 12625 series can be found on the ISO website.
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INTERNATIONAL STANDARD ISO 12625-18:2022(E)
Tissue paper and tissue products —
Part 18:
Determination of surface friction
1 Scope
This document specifies a test method for the determination of the surface friction of tissue paper and
tissue products using a contact-type surface tester.
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
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
coefficient of friction
COF
µ
ratio of the frictional force resisting movement of the surface being tested to the contact force applied
normal to that surface (stylus weight) when tested under specified conditions
...