HVV gives you a comprehensive introduction in zipper selection

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HVV gives you a comprehensive introduction in zipper selection


1. The zipper for shoes is generally recommended to use No. 5 nylon zipper.

2. If the customer needs a nylon zipper with a zipper below No. 5 or any metal zipper/plastic steel zipper, it is recommended that the customer use the appropriate test to confirm whether the overall strength and durability meet the requirements.

3. If you need to use a specific brand of LOGO pull tab, we are happy to develop a special pull tab under the authorization of the customer.

4. The zipper cannot be used for parts with large bending loneliness. Excessive bending loneliness will cause uneven stress on the zipper, resulting in damage to the zipper. The zipper will not be pulled smoothly, and the curb teeth will be damaged. For the slightly curved parts, please pass sufficient tests in advance to confirm whether the solution is feasible.

5. When stitching longitudinally, the position of the stitching line should be at least 3mm away from the chain teeth, otherwise the resistance of the zipper moving up and down will increase; the slider should not be scratched, not stained with glue, and not in contact with chemicals.

6. When the zipper is separated from the sewing machine, do not damage the chain teeth and sliders, which will cause the zipper to be unable to close under the force, especially the nylon zipper.

7. When using a zipper without a bottom stop, the zipper must be sewn with the end completely closed when sewing. It is best to traverse the thread 3 times at a distance of about 1CM from the end, and check whether the zipper is pulled smoothly. Requires a lower stopper to be installed.

8. In view of quality and safety considerations, please do not damage the top stop, chain teeth and sliders when sewing the tape.

9. When molding, put the sleeve plate to shape, please do not pull the zipper forcibly when the zipper does not pull smoothly. It is necessary to close the upper and boots, so that the zipper has a certain running track, and the sleeve plate and the upper should be matched.

10. During the process of pulling the last, the slider of the zipper must be pulled to the end of the zipper before pulling out the last. Special attention: when the two-section last joint is close to the end of the zipper, the lower plate of the slider (the bottom seat of the slider) cannot be damaged.

11. When the shoes are molded, polished and waxed, they cannot be thrown on the slider and zipper.

12. After forming, in order to make the metal zipper pull more smoothly, you can brush the special wax oil on the metal zipper, but don't get it on the vamp during the brushing process.

13. When packing finished shoes, please pay attention to whether the sleeves match the shoes. The principle is the same as that of molding. Do not pull the zipper when the zipper cannot be pulled.

14. When using a metal zipper, the elements and sliders may be affected by chemical substances remaining on the leather, causing discoloration, etc., so please rinse and neutralize fully after processing the leather.

15. For the rust prevention of metal zippers, please do not wipe with strong acid and alkali solvents during production. Processing is only a matter of prolonging the rust. In addition, the fastener elements and sliders may be affected by the chemical substances remaining on the leather, which may cause discoloration, etc., so please thoroughly rinse the leather after processing.

 

Problems that should be paid attention to in practical application of zipper

The zipper is an accessory with a certain strength and must be used properly, which can prolong the service life, otherwise it will be easily damaged.

1. Force control when pulling the slider: Do not use too much force when pulling and closing the zipper, such as hard pulling or sudden force, etc. Because of this, the force will often greatly exceed what the zipper allows.

 

Due to the high load force, it may cause the falling off of the element, the skew of a single element, and the misalignment of the two elements after pulling, commonly known as the phenomenon of "broken stomach".

 

2. Troubleshooting of zipper blocking: If blocking occurs when pulling the zipper, the slider should be moved back a certain distance, and then pulled forward. Remember not to dead-lift. The fastener elements will be skewed and fall off.

 

3. Use the cannula and socket correctly.

 

4. The proper state of the zipper during washing.

 

5. The problem of discoloration of metal.

 

6. The problem of migration.

 

7. Color transfer problem.