Basic Knowledge about the Zippers

A. identification methods of zipper quality

Cloth tape: cloth tape is dyeing uniformly, undefiled, no scars, and soft to the touch, in the vertical direction or in the horizontal direction, the cloth with wavy.

Teeth: the tooth surface of Separating Zippers should be smooth, soft smooth feel the pull start, and less noise.

To pull head: self-locking slider pull start easy locking without slipping.
Patch: patch closely cloth belt, not easy to break, fall off.
Box, hosel: interspersed freely, fastening cloth belt.
On the bottom dead center:
a. top dead center to be closely linked to the first particle teeth (metal, nylon), but the distance is not more than 1 mm and strong and perfect.
b. bottom dead teeth or clamp closely at the top, and fit perfectly.

B. important tips to buy a zipper

Zipper has different adaptability in different environments, so buy the following aspects should be particularly pointed out by the zipper manufacturers:
First, Nylon Zippers should be applied on the kinds of products (such as luggage, footwear, ski clothing, raincoats, tents, leather class need washing jeans or acidic) or other special requirements.
Second, whether the zipper ingredients not conclude (AZO), not contain nickel, or over-needle detector.

C. zipper length tolerance

Due to in the production process of zipper, and the inertia caused by the mechanical operations and considering the integrity of sprocket, the fastener will appear larger tolerance. In addition, the longer length will allow larger tolerance.
Germany, the Japanese YKK tolerance table:
German DIN 3419 section 2.1
Zipper length (mm) Tolerance
250 +-5mm
250-1000 less than +-10mm
1000-5000 less than + -1%
5000 +-50mm

Germany, the Japanese YKK tolerance table:

Japanese YKK zipper tolerance Expo exhibitors in the new century
Zipper length (mm) Tolerance
Less than 30 +-5mm
Less than 60-100 +-15mm
Less than 1000-5000 +-1%
More than 100 +-3%

www.yifeng-zipper.com covers an area of more than 20,000 square meters. We have accumulated a wealth of production experience after ten years of continuous efforts, research and development. Our company is continuing to develop and innovate; we have our own brand "YFA". Now, our products include metal zipper, plastic zipper, diamond zipper, nylon zipper, double bone and invisible zipper, and there are a great variety of goods. To adapt to the needs of the overseas markets in Europe and America, our company uses no lead material and needle detector material to put into production, products undergo strict control checks, tested and approved by the Dongguan Quality and Technical Supervision Bureau, which are in line with the export of European environmental standards.