A,

Commonly used methods of quality identification

Cloth belt: the cloth is dyed evenly, no stain, no scar, and soft touch. In vertical direction or horizontal direction, the cloth must be wavy.

Teeth: the surface of the teeth should be smooth, with soft and smooth hands and less noise.

Pull head: self locking pull head is easy to pull, lock and not slide.

Sticking cloth: it is not easy to break and fall off.

Square and sheath: interspersed freely and fasten cloth tape.

Upper and lower stops:

The first gear should be tightly attached to the A and the top gear.

However, the distance should not exceed 1mm and be strong and perfect.

B, bottom clasp teeth or pliers on top, and solid and perfect.

B, important tips for purchasing zippers

Because zippers have different adaptability in different environments, they should make special recommendations to manufacturers when purchasing zippers.

1. What kind of products are zippers used, such as leather suitcases,

Skiing clothes, raincoats, tent, denim or acid skin, or other special requirements.

Two, the requirements for zipper ingredients, whether it does not contain AZO (AZO), nickel free, or can pass the needle detector.

C, zipper length tolerance

Due to the inertia generated by the speed of mechanical operation and the integrity of the chain teeth, the zipper will have tolerances, and the longer the length, the greater the allowable tolerance.

Germany and Japan YKK tolerance table:

Germany DIN, 3419, Section 2.1

Zipper length (mm) tolerances

250 below +-5mm

250 - 1000 less than +-10mm

1000 - 5000 less than +-1%

More than 5000 +-50mm

Germany, Japan

Tolerance table:

Zipper tolerances presented by YKK in Japan at the new century Fair

Zipper length (mm) tolerances

30 below +-5mm

60 - 100 less than +-15mm

1000 - 5000 less than +-1%

More than 100 +-3%