SIST-TS CEN/TS 14689:2006

Leather - Physical and mechanical tests - Determination of bagginess, creep and relaxation

This European Standard specifies a method of determining the bagginess of leather together with its creep and stress relaxation properties. It is applicable to all non-rigid leathers. e.g. Shoe upper leather, upholstery leather, leathergoods leather and apparel leather. Leather is a viscoelastic material and, upon removal of any applied force, only a proportion of the extension observed is recovered. Even some time after removal of the force there is some degree of permanent deformation which is known as the retained set or bagginess of the leather. Due to the nature of the test method described below it is also possible to obtain a measure of the creep and stress relaxation properties of leather. Although the creep index quoted is not obtained via the true definition of creep, it will however provide a valuable comparative indication of this property in leather.

Leder - Physikalische und mechanische Prüfungen - Bestimmung von Ausbeulneigung, Kriechen und Relaxation

Diese Technische Spezifikation legt ein Verfahren zur Bestimmung der Ausbeulneigung sowie der Kriech- und
Beanspruchungs-Relaxationseigenschaften von Leder fest. Sie gilt für alle weichen Leder, z. B. Schuh-oberleder,
Polstermöbelleder, Lederwarenleder und Leder für Kleidungsstücke. Leder ist ein viskoelastisches
Material, und bei Zurücknahme einer beliebigen aufgewendeten Beanspruchung erholt sich nur ein Teil der
beobachteten Dehnung. Sogar einige Zeit nach Zurücknahme der Beanspruchung besteht ein Grad an
dauerhafter Verformung, der als bleibende Verformung oder Ausbeulneigung des Leders bekannt ist. Auf
Grund der Art des im Weiteren beschriebenen Prüfverfahrens ist es ferner möglich, ein Maß für die Kriech-
und Beanspruchungs-Relaxationseigenschaften von Leder zu erhalten. Auch wenn der angegebene
Kriechindex nicht über die genaue Definition des Kriechens erhalten wurde, wird dieser jedoch eine wichtige
vergleichende Angabe dieser Eigenschaft in Leder liefern.

Cuir - Essais physiques et mécaniques - Détermination du pochage, du fluage et de la relaxation

La présente Spécification Technique prescrit une méthode de détermination du pochage et du fluage du cuir,
et de ses propriétés de relaxation. Elle est applicable a tous les cuirs non rigides, par exemple le cuir de
dessus de chaussure, le cuir pour ameublement, le cuir de maroquinerie et le cuir pour vetements. Le cuir est
un matériau visco-élastique, qui, apres le retrait d’une force qui lui a été appliquée, ne récupere qu’une partie
de l’extension observée. Meme quelque temps apres le retrait de la force, il persiste une déformation
permanente, que l’on désigne sous les termes de déformation rémanente ou de pochage du cuir. La méthode
d’essai décrite ci-apres permet également d’obtenir une mesure du fluage et des propriétés de relaxation du
cuir. Meme si l’indice de fluage indiqué ne correspond pas a la vraie définition du fluage, il donnera cependant
une indication comparative valable de cette propriété du cuir.

Usnje – Fizikalno in mehansko preskušanje – Ugotavljanje stopnje izbočenja in lezenja usnja pod pritiskom in po sprostitvi napetosti

General Information

• Status: Published
• Publication Date: 31-Aug-2006
• ICS: 59.140.30 - Leather and furs
• Technical Committee: IUSN - Leather
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-2006
• Due Date: 01-Sep-2006
• Completion Date: 01-Sep-2006
• Ref Project: CEN/TS 14689:2006 - Leather - Physical and mechanical tests - Determination of bagginess, creep and relaxation

Standards Content (Sample)

SLOVENSKI STANDARD
SIST-TS CEN/TS 14689:2006
01-september-2006
8VQMH±)L]LNDOQRLQPHKDQVNRSUHVNXãDQMH±8JRWDYOMDQMHVWRSQMHL]ERþHQMDLQ
OH]HQMDXVQMDSRGSULWLVNRPLQSRVSURVWLWYLQDSHWRVWL
Leather - Physical and mechanical tests - Determination of bagginess, creep and
relaxation
Leder - Physikalische und mechanische Prüfungen - Bestimmung von Ausbeulneigung,
Kriechen und Relaxation
Cuir - Essais physiques et mécaniques - Détermination du pochage, du fluage et de la
relaxation
Ta slovenski standard je istoveten z: CEN/TS 14689:2006
ICS:
59.140.30
SIST-TS CEN/TS 14689:2006 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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TECHNICAL SPECIFICATION
CEN/TS 14689
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
May 2006
ICS 59.140.30

English Version
Leather - Physical and mechanical tests - Determination of
bagginess, creep and relaxation
Cuir - Essais physiques et mécaniques - Détermination du Leder - Physikalische und mechanische Prüfungen -
pochage, du fluage et de la relaxation Bestimmung von Ausbeulneigung, Kriechen und Relaxation
This Technical Specification (CEN/TS) was approved by CEN on 13 March 2006 for provisional application.
The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.
CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.
CEN members are the national standards bodies of Austria, Belgium, 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
© 2006 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 14689:2006: E
worldwide for CEN national Members.

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CEN/TS 14689:2006 (E)
Contents Page
Foreword.3
1 Scope .4
2 Normative references .4
3 Principle.4
4 Apparatus .5
5 Sampling and sample preparation.6
6 Procedure .6
7 Expression of Results .6
8 Test report .7
Annex A (informative) Sources of apparatus .8

2

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CEN/TS 14689:2006 (E)
Foreword
This Technical Specification (CEN/TS 14689:2006) has been prepared by Technical Committee
CEN/TC “289”, the secretariat of which is held by UNI.
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 announce this Technical Specification: Austria, Belgium, 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 the United Kingdom.
3

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CEN/TS 14689:2006 (E)

1 Scope
This Technical Specification specifies a method of determining the bagginess of leather together with its creep
and stress relaxation properties. It is applicable to all non-rigid leathers. e.g. shoe upper leather, upholstery
leather, leathergoods leather and apparel leather. Leather is a viscoelastic material and, upon removal of any
applied force, only a proportion of the extension observed is recovered. Even some time after removal of the
force there is some degree of permanent deformation which is known as the retained set or bagginess of the
leather. Due to the nature of the test method described below it is also possible to obtain a measure of the
creep and stress relaxation properties of leather. Although the creep index quoted is not obtained via the true
definition of creep, it will however provide a valuable comparative indication of this property in leather.
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.
EN ISO 2418, Leather - Chemical, physical and mechanical and fastness tests - Sampling location (ISO
2418:2002)
EN ISO 2419, Leather - Physical and mechanical tests - Sample preparation and conditioning (ISO
2419:2006)
EN ISO 7500-1, Metallic materials - Verification of static uniaxial testing machines - Part 1:
Tension/compression testing mach
...