For the quality inspection of 3# and 5# metal zipper puller (metal zipper puller), it will carriy out in the following aspects:
Appearance inspection of metal zipper puller
- Purpose: To check whether there is any defect in the appearance of the metal zipper puller, to ensure the aesthetics and use of the product.
- Method:Carefully inspect the surface of 3# and 5# metal zipper puller by manual visual inspection or using optical instruments. Check whether there are scratches, discoloration, burrs, rust, deformation and other defects that affect the appearance and use.
size specification inspection of metal zipper puller
- Purpose: To ensure that the size of 3# and 5# metal zipper puller meet the design requirements so as to match correctly with the zipper chain tape and fabric tape and other components.
- Method:Use vernier calipers or other measuring tools to measure the key size of the metal zipper puller, such as length, width, thickness and so on.Compare the measurement results with the product design drawings or standards to ensure compliance with the specified requirements.
flat puller strength test
- Purpose: To assess the ability of metal zipper puller to resist lateral force under interlocking condition to ensure the durability of zipper.
- Method:According to relevant standards (e.g. QB/T 2171-2014, etc.), intercept a certain length of zipper chain tape and install the metal zipper pullerr on it.Place the specimen on the tensile testing machine and set the appropriate tensile speed and fixture width.Start the testing machine and perform the tensile test on the zipper until the teeth are removed or the sash is broken.Record the maximum value of tensile force and calculate the flat tensile strength according to the formula.
combined strength test of slider and puller piece
- Purpose: To examine the bonding force between puller tab and slider to ensure the stability of zipper in the process of using.
- Method:Use special test tool or fixture to fix the zipper slider and puller piece together. Apply a certain tensile force to the puller tab and observe whether the slider is separated from the puller tab.Record the value of pulling force and compare it with the standard to ensure that it meets the specified requirements.
self-locking force test
- Purpose: To examine whether the slider will still slide easily on the chain tape after locking, and to evaluate the closing performance of the zipper.
- Method:Lock the zipper slider on the chain strap and apply some external force to try to make it slide.Observe and record whether the slider slides or not, and how easily it slides.Based on the test results, assess whether the self-locking performance of the zipper meets the requirements.
Other Performance Tests of metal zipper puller
- Corrosion resistance test: Soak the metal zipper puller in salt water for a certain period of time and then take it out, observe whether there is rust or corrosion on its surface.
- Abrasion resistance test: Use specific testing machine to conduct wear test on the zipper slider to evaluate its abrasion resistance in the process of use.
- Heat resistance test: Place the zipper slider in a high temperature environment for a certain period of time and then remove it to observe whether it will deformed or damaged.
To summarize, for the quality inspection of 3# and 5# metal zipper sliders, it is necessary to make comprehensive considerations from the aspects of appearance, size specification, flat pulling strength, slider pulling piece bonding force, self-locking force, and other performances. Through comprehensive testing, we can ensure that the quality of zipper slider meets the relevant standards and customer requirements, so as to improve the competitiveness and market share of the products.