Usually includes the following steps. The specific operation may vary slightly depending on the equipment model. Please refer to the equipment manual:
Preparation
1. Check the equipment
① Confirm that all parts of the tensile machine (clamp, handle, dial, etc.) are intact.
② Ensure that the clamp is clean and free of oil or residue to avoid affecting the test results.
2. Calibrate the equipment (first use or regular calibration)
Adjust the pointer to zero according to the manual, or use a standard weight to verify the accuracy of the reading.
3. Prepare the sample
(1) Sew the button to be tested on the standard fabric (or keep the button on the original garment), ensuring that the seam is firm.
(2) Cut the fabric and leave enough area around the button (usually ≥5cm×5cm) for clamping.
Test steps
1. Fix the sample
Upper clamp: clamp the fabric (avoid the seam) and ensure that the fabric is flat and does not slide.
Lower clamp: Clamp the button (if it is a four-hole button, it needs to be fixed with a special clamp or hook).
Note: The direction of the clamp must be consistent with the force direction of the button (such as vertical or horizontal stretching).
2. Start the test
(1) Slowly turn the handle or pull the lever to apply tension at a constant speed (usually the speed recommended is 10-15cm/min).
(2) Observe the connection between the button and the fabric until the button falls off or the stitching breaks.
3. Record data
(1) Read the maximum tension value indicated by the pointer (usually in Newtons N or pounds-force lbf).
(2) Record the damage form when the button falls off (such as stitching breakage, button fragmentation, etc.).
Post-test operation
1. Reset the equipment
(1) Loosen the clamp, remove the sample, and return the handle of the tensile machine to its original position.
(2) Clean the thread or fabric fragments remaining in the clamp.
2. Data analysis
Compare the test results with industry standards (such as ASTM D4846, ISO 13935, etc.) to determine whether the button is qualified.
Precautions
Safe operation: Avoid rapid force or overload testing to prevent the fixture from breaking and injuring people.
Environmental conditions: It is recommended to test in a standard temperature and humidity environment (such as 23±2℃, 50±5%RH).
Multiple tests: It is recommended to test the same button 3-5 times and take the average value to improve accuracy.
Common problem handling
The pointer does not return to zero: Check whether the spring or lever is stuck, and contact the manufacturer for calibration if necessary.
Button slips: Replace the fixture or use an anti-slip pad to enhance the clamping force.
If more detailed guidance is required, please provide the equipment model or refer to the specific manual.
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