GB/T 38037-2019Footwear - Test method for slide fasteners - Strength of slide fastener pullers (English PDF)

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.

6.1 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.