How to produce metal zippers

November 19, 2017 BY TRIMS CO.,LIMITED Zipper Knowledge

Metal zippers are widely used in clothing, boots, handbags and other daily necessities. Do you know how it is produced? Earlier we learned about the manufacturing process of nylon zippers and polyester zipper. The production of metal zippers is similar to them. Metal Zipper generally refers to Brass Zipper, It is basically divided into 4 stages, including dyeing, chain production, slider manufacturing and finished product. However, the slight difference is that metal separating zipper`s dyeing is arranged before teeth chain production.

There are also many options for the shape of the metal clothing zipper, normal round teeth,Y-cut teeth, European teeth and so on. Among them, Y-cut teeth and normal teeth are relatively stable in quality and have a large production capacity, so they are the most common type on the market.

For different metal zippers, the distinction is not simply the shape but the processing technology. For example, metal zipper with normal round teeth is made of metal strips by die-stamping, the material utilization rate of which is only about 60%. What`s more, this manufacturing procedure inevitably brings the processing marks and even burrs on the surface of teeth, having a negative influence on the appearance and sale of zipper product.

Different from it, Y-cut teeth adopts the processing method of preformed wire. The preformed wire is sheared to small chips and then these chips are forged to make a concave and a protrusion. At last, two legs of chips are bent to cramp the zipper tape. As a result, the utilization rate of materials reaches more than 98%, the production efficiency is higher and the appearance quality of zipper chain is greatly improved. In addition, it not only simplify the post-processing production, but also improve the strength of zipper chain.

Main Production Process

Weaving tape – Making teeth – Assembling tape and teeth – Flattening – Polishing – Dyeing – Ironing – Waxing – Determining length – Assembling accessories – Inspection – Packaging and storage

Main Material

Tape: Polyester filament or cotton yarn

Teeth: Brass, copper, aluminum alloy

Slider: zinc alloy

Top and bottom stopper: Aluminum alloy, copper alloy

Pin and box: zinc alloy