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GB/T 38037-2019: Footwear - Test method for slide fasteners - Strength of slide fastener pullers
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Footwear - Test method for slide fasteners - Strength of slide fastener pullers
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GB/T 38037-2019
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Basic data | Standard ID | GB/T 38037-2019 (GB/T38037-2019) | | Description (Translated English) | Footwear - Test method for slide fasteners - Strength of slide fastener pullers | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y78 | | Classification of International Standard | 61.060 | | Word Count Estimation | 10,123 | | Date of Issue | 2019-10-18 | | Date of Implementation | 2020-05-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 38037-2019: Footwear - Test method for slide fasteners - Strength of slide fastener pullers---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Footwear - Test method for slide fasteners - Strength of slide fastener pullers
ICS 61.060
Y78
National Standards of People's Republic of China
Test method for footwear zipper pull tab strength
2019-10-18 released
2020-05-01 Implementation
State Administration for Market Regulation
Issued by China National Standardization Administration
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
The translation method used in this standard is equivalent to ISO 10734.2016 "Shoes Zipper Test Method Pull Tab Strength".
The Chinese documents that have consistent correspondence with the normatively cited international documents in this standard are as follows.
---GB/T 2703-2017 Footwear Terminology (ISO.19952.2005, NEQ)
---GB/T 16825.1-2008 Inspection of static uniaxial testing machine Part 1.Tensile and (or) pressure testing machine force measuring system
Inspection and calibration (ISO 7500-1.2004, IDT)
---GB/T 22049-2019 Footwear and footwear components environmental regulation and test standard environment (ISO 18454.2018, IDT)
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China National Light Industry Council.
This standard is under the jurisdiction of the National Footwear Standardization Technical Committee (SAC/TC305).
Drafting organizations of this standard. Shanghai Jianzheng Leather Quality Inspection Technology Center, China Leather and Footwear Research Institute Co., Ltd., Jiaxing Furhe
Shoe Industry Research Institute.
The main drafters of this standard. Li Fangzhou, Ma Lin, Yuan Xuzheng, Tian Wang.
Test method for footwear zipper pull tab strength
1 Scope
This standard specifies the test method for determining the strength of the pull tab of a shoe zipper.
This standard applies to all kinds of zippers for shoes.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
ISO 7500-1 Calibration and Inspection of Static Uniaxial Testing Machines for Metallic Materials Part 1.Tensile and/or Compression Testing Machines
Calibration and inspection of force measurement system
ISO 18454 Footwear, footwear and footwear components, environmental regulation and test standard environment
ISO.19952 Footwear Terminology
3 Terms and definitions
The following terms and definitions defined in ISO.19952 apply to this document.
3.1
zipper
The connecting piece that fixes two pieces of flexible material is composed of interlockable elements attached to the opposite edges of the two cloth belts and movable across the elements.
Composed of a movable slider, when the slider moves in one direction, the chain teeth (3.5) on the two cloth belts (3.2) can be meshed with each other.
Note. When the slider (3.3) moves in the opposite direction, the chain teeth can be separated (see Figure 1).
3.2
Cloth tape
Textile belt used to carry fastener elements and other zipper components.
3.3
Pull head
When sliding on the chain, the chain teeth are meshed or pulled apart.
3.4
Pull tab
Plastic or metal sheet attached to the slider for easy pulling.
3.5
Chain teeth
They can be engaged with each other and are unique parts of zippers or plastic continuous spiral chains.
3.6
The start or end component of the tooth chain prevents the slider from being detached from the tooth chain belt.
3.7
Tooth chain belt
The textile cloth belt fixed with chain teeth can be connected with another cloth belt through the chain teeth.
4 Principle
Clamp the slider and the slider so that the slider is perpendicular to the slider. Methods as below.
Method 1.Pulling force---measure the force required to pull the pull tab from the slider along the direction parallel to the longitudinal center line of the pull tab.
Method 2.Torque-in the direction of the longitudinal centerline of the pull tab, measure the torque required to twist the pull tab from the slider.
5 Test equipment and materials
5.1 Method 1-Tensile testing machine
5.1.1 Clamp, separation speed (100 ± 10) mm/min.
5.1.2 The measuring force range is up to 1kN, and the accuracy is greater than 2%, which meets the secondary requirements in ISO 7500-1.
5.1.3 A device that records the force or maximum force during the test.
5.1.4 There is a clamp in a clamp for fixing the pull head to be tested. A flat plate with a thickness of at least 1mm can be placed between the slider and the tab
In the meantime, the flat plate is provided with a tapered groove which can accommodate the slider, and the slider is clamped in the clamp through the long arm connected on the plate. See Figure 2a).
5.1.5 In the other clamp, there is a device to clamp the pull tab. There is a small rigid hook on the device for pull tabs with holes.
5.2 Method 2-Torque Test Equipment
5.2.1 A pair of clamps, one can fix the test slider, and the other can clamp the pull tab so that the pull tab is perpendicular to the slider.
5.2.2 The two clamps (5.2.1) rotate at a relative speed of (9±3)(°)/s.
5.2.3 Measure the torque between the two clamps to an accuracy of 0.5N·m.
5.2.4 The indexer measures the torsion angle to an accuracy of 1°.
5.3.1 For Method 1, at least 3 zippers are required for the test.
5.3.2 For Method 2, at least 6 zippers are required for the test.
6 steps
6.1 Environmental regulation
Before the test, the sample should be adjusted according to ISO 18454 for at least 24h, and the test should be carried out in the same environment.
6.2 Method 1-Tension
6.2.1 Remove the pull-down head from the tooth chain belt of the zipper to be tested. Clamp the slider with a clamp (5.1.4) to make it 90° with the axis of the tensile testing machine (5.1).
6.2.2 Connect the pull tab of the zipper to be tested to the equipment (5.1.5) so that the pull tab is parallel to the axis of the tensile testing machine (5.1). Try to use this
Clamp the pull tab in such a way that the equipment (5.1.5) will not cause unnatural damage to the pull tab during the test. If it is a two-hole pull tab, and the top hole looks
When it is more fragile, insert the hook into the bottom hole.
6.2.3 Start the tensile testing machine and separate the clamps at a speed of (100 ± 10) mm/min until the pull tab is damaged or the pull tab falls off the slider.
6.2.4 Record the maximum force in Newtons, accurate to 5N, and record the type of damage, for example.
---The slider is damaged at the connection of the pull tab;
---The pull tab is damaged at the connection of the slider;
---The slider is damaged at the connection of the non-pull tab;
---The pull tab is damaged at the non-pull connection.
6.2.5 If the pull tab is damaged at the connection with the equipment (5.1.5), or the test fails due to the equipment, ignore the test result and use a new one.
The zipper re-tested.
6.2.6 Repeat steps 6.2.1 to 6.2.5 for the remaining two zipper samples.
6.2.7 Calculate the arithmetic average of the three maximum forces (6.2.4).
6.3 Method 2-Torque
6.3.1 Remove the pull-down head from the tooth chain of the zipper to be tested. Clamp the slider on one clamp (5.2.1), and clamp the pull tab on the other clamp to make
The pull tab is perpendicular to the slider, and the longitudinal centerline of the pull tab is consistent with the axis of rotation between the two clamps [see Figure 2b)].
6.3.2 Start the test equipment (5.2), from the perspective of the pull tab, the two clamps are rotated in a clockwise direction at a speed of (9±3)(°)/s, until.
---The pull tab is damaged or twisted off the slider;
---The clamp has been rotated 180°.
6.3.3 Record the maximum torque in N·m, accurate to 0.5N·m, and record the type of damage, for example.
---The slider is damaged at the connection of the pull tab;
---The pull tab is damaged at the connection of the slider;
---The slider is damaged at the connection of the non-pull tab;
---The pull tab is damaged at the non-pull connection;
---The pull tab is twisted but not damaged.
6.3.4 If the pull tab is permanently twisted, use the indexer (5.2.4) to estimate the twist value to the nearest 5°.
6.3.5 Repeat steps 6.3.1 to 6.3.4 for the remaining two zippers.
6.3.6 Calculate the arithmetic average of the three maximum torques (6.3.3).
6.3.7 Repeat steps 6.3.1 to 6.3.6 for the remaining three zippers, rotating the clamp (5.2.1) counterclockwise.
7 Test report
The test report should contain the following information.
a) Number of this standard;
b) A detailed description of the test sample;
d) The test method used, method 1 or method 2.
--- Method 1, the arithmetic mean of the maximum tensile force calculated according to 6.2.7;
--- Method 2, calculate the arithmetic average of the maximum torque in each torsion direction according to 6.3.6;
e) Description of the type of damage;
f) Any deviation from this test method.
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