①Lateral tension resistance of zipper (2.5cm)
Determination of tensile strength of general zipper: This is the method used to indicate the strength of general zipper. The tensile strength is determined by applying a force at an angle perpendicular to the direction of the zipper and at a fixed speed to the zipper in the state of zipper bite.
②Tension resistance at the top of the zipper
When the bottom end of the zipper is fixed and the chain head is pulled to the top stop, the amount of tension resistance can be measured by applying force to the snap located at the top of the zipper. This is the test method to measure the strength of the top stop.
③Tension resistance at the bottom end of the zipper
This test is to test the ability of the bottom stop to resist bad pulling. By pulling the pulling buckle to the bottom end of the chain, two flat chains one left and one right, the bottom end tension resistance can be measured to measure the blocking strength of the bottom stop and the resistance strength of the teeth inside the slider.
④Locking strength of the slider
The zipper buckle is locked in the middle of the zipper, and the two not engaged zippers are one left and one right to determine the locking strength and the resistance strength of the teeth inside the slider.
⑤Comprehensive strength of the slider (90°)
The strength of the slider is measured in the case of applying force to the pull tab of the finished slider and under the carcass. For a complete zipper fastener, when the force is applied to the zipper weight piece and its lower part of the zipper fastener, the tension resistance of the zipper fastener can be measured, in addition to the 90° measurement method shown below, there is also a 45°measurement method.