Standard Test Methods for Strength Testing for Zipper

 

Zippers are widely used in various industries, such as apparel, luggage, and automotive, to secure openings and provide easy access. It is essential to ensure the strength and durability of zippers to meet the functional requirements and guarantee customer satisfaction. This document presents standard test methods for evaluating the strength of zippers.

 

These test methods are applicable to all types of zippers, including metal, plastic, and coil zippers. The tests evaluate the strength properties of zippers, including the pull-off strength, slider lock strength, and end stop strength. These tests provide a reliable and standardized approach for measuring zipper strength.

 

3.1 Pull-off strength: The force required to separate the slider from the zipper chain.

3.2 Slider lock strength: The force required to break the locking mechanism of the slider.

3.3 End stop strength: The force required to break the end stop of the zipper chain.

3.4 Zipper chain: The interlocking elements that form the closure of the zipper.

3.5 Slider: The moving part of the zipper that opens and closes the zipper chain.

 

4.1 Universal Testing Machine (UTM): A machine capable of applying controlled tensile forces to test specimens.

4.2 Grip attachments: Grips specifically designed to securely hold and apply forces to the zipper components, such as the slider and zipper chain.

4.3 Force gauge: A device for measuring the force applied during the test.

 

5.1 Pull-off strength test:

5.1.1 Cut a section of the zipper chain at least 100mm long.

5.1.2 Attach one end of the zipper chain securely to the grip attachment of the UTM.

5.1.3 Attach the other end of the zipper chain to the sliding attachment of the UTM, ensuring proper alignment.

5.1.4 Apply a steady and continuous force in the opposite direction of the slider.

5.1.5 Note the maximum force applied before the slider detaches from the zipper chain.

 

5.2 Slider lock strength test:

5.2.1 Secure the slider on the zipper chain.

5.2.2 Attach the slider to the grip attachment of the UTM.

5.2.3 Apply a steady and continuous force in the opposite direction of the slider movement.

5.2.4 Note the maximum force applied before the locking mechanism of the slider breaks.

 

5.3 End stop strength test:

5.3.1 Cut a section of the zipper chain, including the end stop.

5.3.2 Attach one end of the zipper chain securely to the grip attachment of the UTM.

5.3.3 Attach the end stop of the zipper chain to the sliding attachment of the UTM.

5.3.4 Apply a steady and continuous force in the opposite direction of the end stop.

5.3.5 Note the maximum force applied before the end stop breaks.

 

6.1 The test results shall include the description of the tested zipper, including its type and dimensions.

6.2 The test results shall include the forces applied during the tests and the corresponding outcomes.

6.3 Any deviations from the test methods shall be reported.

6.4 The test report shall be documented and retained for reference.

 

Standard test methods for strength testing for zippers play a crucial role in ensuring the quality and performance of zippers. These tests help manufacturers meet industry standards, retailers ensure product reliability, and consumers make informed purchasing decisions. By conducting tests such as tensile strength, slider pull-off, slider locking strength, and durability tests, the strength and durability of zippers can be effectively evaluated. It is important to follow the specified procedures and use appropriate equipment to obtain accurate and reliable results.