GB/T 17928-2023 PDF English
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| GB/T 17928-2023 | English | 170 |
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Leather - Physical and mechanical tests - Measurement of stitch tear resistance
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| GB/T 17928-1999 | English | 130 |
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Leather. Determination of the stitch tear resistance
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GB/T 17928-2023: PDF in English (GBT 17928-2023) GB/T 17928-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.140.10
CCS Y 46
Replacing GB/T 17928-1999
Leather – Physical and Mechanical Tests – Measurement of
Stitch Tear Resistance
(ISO 23910.2019, MOD)
ISSUED ON. AUGUST 6, 2023
IMPLEMENTED ON. MARCH 1, 2024
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 6
4 Principle... 7
5 Apparatus... 7
6 Sampling and Preparation of Specimens... 9
7 Test Procedures... 10
8 Expression of the Results... 10
9 Test Report... 11
Foreword
This Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for
Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents.
This Document replaced GB/T 17928-1999 Leather - Determination of the Stitch Tear
Resistance. Compared with GB/T 17928-1999, the major technical changes of this Document
are as follows besides the structural adjustments and editorial modifications.
--- Change the scope of application of the standard (see Clause 1 of this Edition; Clause 1
of the 1999 Edition);
--- Add two Clauses of "Terms and Definitions" and "Principles" (see Clauses 3 and 4 of
this Edition);
--- Change the instruments and equipment; and detail the requirements for tensile machines,
die cutters, etc. (see Clause 5 of this Edition; Clause 3 of the 1999 Edition);
--- Change the specimen size (see Figure 3 of this Edition; Figure 3 of the 1999 Edition);
--- Change the test conditions (see 6.3 of this Edition; Clause 4 of the 1999 Edition);
--- Change the measuring point of the specimen thickness (see 7.1 of this Edition; 6.1 of the
1999 Edition);
--- Change the fixing method of the specimen; and delete the requirement for the length of
the lower end of the specimen (see 7.3, 7.4 of this Edition; 6.2, 6.3 of the 1999 Edition);
--- Change the method of expressing the test results (see Clause 8 of this Edition; Clause 7
of the 1999 Edition);
--- Change the content of the test report (see Clause 9 of this Edition; Clause 8 of the 1999
Edition).
This Document modified to adopt ISO 23910.2019 Leather – Physical and Mechanical Tests –
Measurement of Stich Tear Resistance.
Compared with ISO 23910.2019, this Document made the following structural adjustments.
--- The third item of 5.1 corresponds to the third and fourth items of 5.1 in ISO 23910.2019;
--- 6.1 corresponds to the first sentence of 6.1 in ISO 23910.2019;
--- 6.2 corresponds to 6.1 (except the first sentence) in ISO 23910.2019;
--- 6.3 corresponds to 6.2 in ISO 23910.2019;
Leather – Physical and Mechanical Tests – Measurement of
Stitch Tear Resistance
1 Scope
This Document describes the test method for the stitch tear resistance of leather.
This Document is applicable to the determination of the stitch tear resistance of various types
of leather, especially for leather with a thickness greater than 1.2 mm.
2 Normative References
The provisions in following documents become the essential provisions of this Document
through reference in this Document. For the dated documents, only the versions with the dates
indicated are applicable to this Document; for the undated documents, only the latest version
(including all the amendments) is applicable to this Document.
GB/T 16825.1 Metallic materials - Calibration and verification of static uniaxial testing
machines - Part1.Tension/compression testing machines - Calibration and verification of
the force-measuring system (GB/T 16825.1-2022, ISO 7500-1.2018, IDT)
GB/T 39364 Leather - Chemical, physical, mechanical and fastness tests - Sampling
location (GB/T 39364-2020, ISO 2418.2017, MOD)
QB/T 2262 Terms of leather industry
QB/T 2707 Leather - Physical and mechanical tests - Sample preparation and conditioning
(QB/T 2707-2018, ISO 2419.2012, MOD)
QB/T 2709 Leather - Physical and mechanical tests - Determination of thickness (QB/T
2709-2005, ISO 2589.2002, MOD)
3 Terms and Definitions
For the purposes of this Document, the terms and definitions given in QB/T 2262 apply.
the grain surface with a die cutter (5.5), of which 3 specimens have their long sides parallel to
the spine (longitudinal specimens) and the other 3 specimens have their long sides
perpendicular to the spine (transverse specimens). If the spine cannot be identified, samples are
taken in two mutually perpendicular directions. The preparation of the specimen shall be carried
out with a die cutter (5.5), and no knife or other similar tools shall be used for subsequent
cutting.
If there are more than 2 samples in the same batch of products that need to be tested, at least 1
specimen can be cut from each sample in each direction, and the total number of specimens in
each direction shall be no less than 3.
6.3 Sample conditioning
It shall be performed according to the provisions of QB/T 2707.If the specimen is not prepared
under standard atmosphere or the specimen is not tested immediately after cutting, the specimen
shall be placed in standard atmosphere again for conditioning.
7 Test Procedures
7.1 Measure the thickness of the specimen at the specified point according to the provisions of
QB/T 2709.The measuring point should be about 10mm away from the lower end of the
specimen notch (see Figure 3).
7.2 Fix the upper end of the metal specimen clamp (5.2) in the upper fixture of the tensile
machine.
7.3 Place the notch of the specimen between the two arms of the specimen clamp; and pass the
metal needle plate through the test hole of the specimen clamp and the notch of the specimen.
7.4 Fix the other end of the specimen in the lower fixture of the tensile machine.
7.5 Start the tensile machine for the test and record the maximum force when the specimen is
torn, measured in N.
7.6 Test other specimens according to the provisions of 7.1 to 7.5.
8 Expression of the Results
8.1 Stitch tear force
The test results are expressed by the arithmetic mean of the tear force of three longitudinal
specimen and the arithmetic mean of the tear force of three transverse specimen, accurate to
0.1N. If required by the customer or other specifications, the test results can be expressed by
the arithmetic mean of the tear force of 6 specimens, but this shall be noted in the test report.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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