The basic standards of metal zippers are as follows:
1. The whole zipper has complete parts and parts, and the chain teeth are neatly arranged without missing or bad teeth.
2. The lower stop of the zipper is not obviously skewed, and the pulling head shall not be stuck when pulling and closing.
3. Open tail zipper (including double open tail zipper) insert and start flexibly; Strengthen the adhesive tape and cloth tape firmly and neatly.
4. The surface decoration layer of the zipper head (also called the pull head) is firm and uniform, without bubbles, peeling and other defects, and the cavity is smooth and smooth; The slide is flexible and the trademark is clear.
Zipper size parameters shall be specified in article 3.3; The length of the code is 100m±0.5m per hundred meters. The color of the chain belt is bright, and the color difference of the chain belt in the same batch number reaches the third level stipulated by GB250. The color difference of the same chain belt shall reach the four levels stipulated in GB250.
Colour fastness to rubbing: The colour fastness to rubbing of the chain meets the requirements of GB251 level 3~4.
Color fastness to washing: the color fastness of the chain belt after washing meets the requirements of GB250 level 3~4.
No more than 3 joints per 100 meters of yard chain belt.
The special requirements for metal zippers or other components that do not contain banned azo, nickel, and inspection needles shall be agreed by both parties.
