Zippers

A zipper is a commonly used device for binding the edges of an opening of fabric or other flexible material, as on a garment or a bag.
==Description==
The bulk of a zipper/zip consists of two rows of protruding teeth which may be made to interdigitate, linking the rows, carrying from tens to hundreds of specially shaped metal or plastic teeth. These teeth can be either individual or shaped from a continuous coil, and are also referred to as elements. The slider, operated by hand, moves along the rows of teeth. Inside the slider is a Y-shaped channel that meshes together or separates the opposing rows of teeth, depending on the direction of the slider's movement. The word Zipper is onomatopoetic, because it was named for the sound the device makes when used, a high-pitched zip.
==Types==
===Coil Zippers===
Coil zippers now form the bulk of sales of zippers worldwide. The slider runs on two coils on each side; the teeth are formed by the windings of the coils. Two basic types of coils are used: one with coils in spiral form, usually with a cord running inside the coils; the other with coils in ladder form, also called the Ruhrmann type. Coil zippers are made of polyester coil and are thus also termed polyester zippers. Nylon was formerly used and though only polyester is used now, the type is still also termed a nylon zipper.
===Invisble Zippers===
Invisible zippers have the teeth hidden behind a tape, so that the zipper is invisible. The tape's color matches the garment's, as does the slider's. This kind of a zipper is common in skirts and dresses. Invisible zippers are usually coil zippers. They are also seeing increased use by the military and emergency services because the appearance of a button down shirt can be maintained, while providing a quick and easy fastening system.
===Metallic Zippers===
Metallic zippers are the classic zipper type, found mostly in jeans today. The teeth are not a coil, but are individual pieces of metal molded into shape and set on the zipper tape at regular intervals. Metal zippers are made in brass, aluminum and nickel, according to the metal used for teeth making. All these zippers are basically made from flat wire. A special type of metal zipper is made from pre-formed wire, usually brass but sometimes other metals too. Only a few companies in the world have the technology. This type of pre-formed metal zippers is mainly used in high grade jeans-wear, work-wear, etc., where high strength is required and zippers need to withstand tough washing.
==Gallery==
pink zippers.jpg
Plastic-_and_Nylonzipper.jpg
golden zipper.jpg
rainbow zipppers.jpg
Category:Clothing
Category:Everyday Objects
Category:Rainbow
Category:Tools