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GB/T 17928-1999 English PDF (GBT17928-1999)

GB/T 17928-1999 English PDF (GBT17928-1999)

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GB/T 17928-1999: Leather. Determination of the stitch tear resistance

This Standard specifies the determination method of leather stitch tear resistance. This Standard applies to all kinds of leather.
GB/T 17928-1999
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.140.10
Y 45
Leather - Determination of the stitch tear resistance
ISSUED ON: DECEMBER 17, 1999
IMPLEMENTED ON: MAY 01, 2000
Issued by: The State Quality and Technical Supervision Bureau
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Instruments and apparatuses ... 4
4 Test conditions ... 5
5 Sample preparation ... 5
6 Test procedure ... 5
7 Result expression ... 6
8 Test report ... 6
Foreword
This Standard is equivalent to adopt German DIN 53331-1980, "Testing of leather - Determination of the stitch tear resistance".
On the basis of the actual situation in our country, and under the premise of not affecting the test results, the standard contents of this Standard are compiled to meet the requirements of our country, which is convenient for practical operation.
In the production process of leather products, leather clothes, bags, shoes are made after sewing. The determination method of stitch tear resistance is to simulate the stress of leather after sewing for testing, which is more practical than other methods of testing leather tear strength.
DIN 53331 stipulates that at least three samples shall be taken in each direction, and the long side of each sample shall be at least 50 mm. For the convenience of users in our country, this Standard specifies that three samples shall be taken in each direction, and the long side of each sample shall be 100 mm. If the to- be-tested leather sample is small, cut a sample whose long side is 50 mm. When the thickness of the leather sample reaches (or exceeds) 1.2 mm,
because the thickness may affect the sampling (test hole), a steel needle whose diameter is 1.0 mm can be directly used for test.
This Standard was proposed by the State Administration of Light Industry. This Standard is under the jurisdiction of the National Fur Leather Tanning Standardization Center.
The drafting organizations of this Standard: China Leather Industry Research Institute.
The drafters of this Standard: Zhao Liguo.
Leather - Determination of the stitch tear resistance
1 Scope
This Standard specifies the determination method of leather stitch tear resistance.
This Standard applies to all kinds of leather.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. QB/T 3812.1-1999, Leather - Laboratory sample - Location and identification QB/T 3812.2-1999, Leather - Conditioning of test pieces for physical tests QB/T 3812.4-1999, Leather - Physical testing - Measurement of thickness 3 Instruments and apparatuses
3.1 Thickness gauge: in accordance with the provisions of QB/T 3812.4; the minimum division value is 0.01 mm.
3.2 Tensile machine: it is vertically operated; the speed is (100 ?? 10) mm/min. 3.3 Fixture: it is made of metal, as shown in Figure 1; it consists of a plier head that has two flat pinholes and a corresponding flat pin plate (Figure 2). 3.4 Test needle plate: it is made of metal, as shown in figure 2; flat needle plate; the thickness is 1.0 mm.
3.5 Steel mold knife: it shall be able to blank the sample that is shown in Figure 3.

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