
Coil zipper

Coil zipper—also known as nylon coil zipper—is a type of zipper whose teeth/elements are made from that is traditionally nylon. The coil is sewn to a zipper tape to make the final product. The final zipper product is completed when the nylon coiled teeth are sewn onto the zipper tape. Nylon coil zippers have a continuous coil chain made from nylon. When this coil is positioned on the back of the zipper and not in the front, this kind of zipper is called invisible zipper.
Design.
Nylon zippers are highly flexible and are available in a wide range of sizes. The high compatibility of the coil zippers is the main attribute for their huge number of applications in fashion wear, canvas goods, and bags. These types of zippers are also the top choice for the outdoor and luggage industries. Nylon coil zippers are most commonly found in tents, suitcases, backpacks, and other camping apparels.
Though nylon coil zippers are a popular choice for a large number of applications, the use of nylon is now being replaced with polyester. Polyester coil zippers are also becoming widespread. They are made in various gauge sizes and colors. This makes them well-suited to several use cases. 
Benefits.
Coil zippers offer higher horizontal strength . Coil zippers are also easier to repair; an out-of-alignment tooth can be realigned simply by zipping and unzipping past it. Another advantage of nylon zippers is its two-way functionality. The sliders can be fixed in either direction of the zipper chain and they will can still function smoothly. Nylon is lightweight, heat resistant and rustproof, making nylon coil zippers durable and reliable.
Manufacturing.
The main elements required in the manufacturing process of coil zipper are a stringer, slider, and a tab. The stringer consists of a tape and teeth assembly. The tab is used to pull the slider up and down which opens and closes the zipper.