The zipper load pull test machine is used to test how many times the zipper can withstand the pull operation under a certain tension. Its test method is as follows:

1. Prepare the zipper sample: choose a zipper sample that meets the requirements, the length is generally about 50cm.

2. Adjust the testing machine: fix one end of the zipper sample on the testing machine and the other end on the tension sensor to ensure that the tension of the sample can be measured accurately.

3. Set the pulling force: According to the test requirements, set the pulling force, which is generally 70%~80% of the rated pulling force of the zipper.

4. Start the test: Start the testing machine and let the zipper pull until the zipper breaks or the set number of pulls is reached.

5. Record test results: record the number of times the zipper is pulled and the location of the break, as well as other relevant information.

6. Analysis results: analyze the durability of the zipper according to the test results, and evaluate the quality of the zipper.

It should be noted that the specific operation method of the zipper load pull test machine may be different, please refer to the operation manual of the equipment before the specific operation.