1. Contrast color zippers (the fabric is inconsistent with the zipper tape, such as white fabric with black or red zipper tape), you must pay attention when purchasing, the color fastness must be good, and the zipper must be tested and confirmed before being sewn before it can be put into production;

2. Nylon zipper is used for PVC fabric or waterproof/ski fabric (light color), please note that the fabric will absorb the oil stains in the zipper and cause the fabric to be stained;

3. The cotton garment with metal zipper will change color after dyeing. Discoloration is caused by the chemical reaction of the mouthpiece, the split piece, the slider and the top stop after acid/alkaline dyeing.

4. White-plated nickel-free and rack-plated white-free nickel-free sliders are easy to change color (such as yellowing, black, etc.) on white cotton materials (such as wool products), mainly because they are not cleaned after bleaching and dyeing. , caused by reaction with chemical residues.

5. 8#, 10# resin, metal puller or larger-volume puller, round puller are not effective for needle inspection. On the one hand, it is due to its large size, and on the other hand, the circular pull tab will generate a magnetic field when testing the needle, thereby affecting the effect of the needle detection test.

6. Discoloration

The mic teeth of the metal zipper turn black and the discolored mic teeth will pollute the clothing. Once the copper alloy is oxidized, it will turn black... Do not seal the bag, keep it breathable, and be careful not to be full of moisture (use Moisture-proof paper, moisture-proof agent, the effect will be better).

7. Dyeing

The dye on the zipper may react with plasticizers, adhesives, oils and other components in polyethylene, synthetic leather, resin coating of fabrics, etc., and the phenomenon of migration will occur. The finished products should be separated by paper, and Note the save state.

8. Migration

Due to the use of dyed brown zippers or black zippers, contamination may occur in the contact area between the fabric and the zipper. During the dyeing process of clothing, the remaining acidic substances or oxidants react chemically, which may cause contamination of the contact area between the zipper and the clothing. Please use fully washed fabrics and materials.