How to judge the quality of zipper

January 04, 2020

Zippers are widely used in clothing, shoes, hats, tents and other items, and are an indispensable fastener in people's lives. For different matching objects, their requirements on functional, decorative and economical aspects of zipper products are different. Therefore, when purchasing a zipper, the corresponding zipper requirements should be raised according to the object used.

When judging the quality of the zipper, you need to focus on two aspects. One is the overall quality of the zipper products, such as the pass rate of the entire batch of products or the stability of the zipper quality over a considerable period of time. The other refers to the specific zipper quality, such as the physical characteristics and technical parameters of the zipper. The former reflects the management level of the zipper manufacturer, while the latter shows the manufacturing level. Both are the basic standards for measuring the overall quality level of the factory.

The Quality Standards of Zippers
The quality standards of zippers are composed of GB/T18746-2002 zipper terminologies (mainly specify the definition, form, type, size and specification of zipper components, and the physical property of zippers) and QB/T2171 ~2173- 2001 zipper standards (specify the standards for metal zippers, plastic zippers and nylon zippers)

Main Physical Properties of Zippers
The physical properties of zippers mainly mean their mechanical property, with the strength index as the core, determining zipper’s application range and durability. The strength index is clearly defined as the main basis for testing the quality of zipper products in domestic and foreign zipper standards.

In Chinese standards, there are 12 indexes for metal zippers and plastic zippers, and 10 indexes for nylon zippers because nylon zipper teeth are continuous.

4 indexes for slider: slider and puller pull-off strength, resistance to twist of puller and slider, slider deflection strength, holding strength of slider lock

1 index for tape: chain crosswise, single element slippage strength (metal zipper and plastic zipper)

4 indexes for functional accessory: holding strength of top stop, holding strength of bottom stop, open end chain crosswise strength, pin/box slippage strength

2 comprehensive indexes for zipper: tap pull-off strength, reciprocation test (double)

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