Here are the details on how the ASTM D2061 test is conducted:
1. Sample preparation: The zipper to be tested is cut to a specified length and the slider is removed. The two free ends of the zipper tape are then clamped into the jaws of the testing machine.
2. Test conditions: The test is performed under standard conditions of temperature and humidity, which are specified in the ASTM D2061 standard. The temperature is typically 23 ± 2 °C (73 ± 4 °F) and the relative humidity is 50 ± 5%.
3. Initial load: The jaws of the testing machine are separated at a specified speed (usually 102 mm/min or 4 in/min) until the two zipper halves are separated by a specified distance (usually 25 mm or 1 in). A small initial load is then applied to the jaws to ensure that the zipper is securely clamped in place.
4. Test procedure: The jaws of the testing machine are then separated at a constant rate until the zipper fails, which is typically indicated by a sudden drop in force. The maximum force applied to the zipper before failure is recorded, as well as the elongation at failure and the distance between the jaws at failure.
5. Calculation of results: The maximum force applied to the zipper before failure is divided by the width of the zipper tape to obtain the zipper strength in newtons per millimeter (or pounds-force per inch). This value is reported as the zipper's strength or tensile strength.
6. Reporting: The results of the test are reported in accordance with the ASTM D2061 standard, which specifies the information that should be included in the test report.
In summary, the ASTM D2061 test for zipper strength involves clamping a zipper into the jaws of a testing machine, applying a load to the zipper until it fails, and recording the maximum force applied before failure. The test provides important information on the strength and durability of zippers, which is important for product quality control, safety, and compliance with regulations.
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