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   About zippers
   A zipper (British English: zip or (rarely) zip fastener) is a popular device for temporarily joining two edges of fabric. It is used in clothing (e.g. jackets and jeans), luggage and other bags, sporting goods, camping gear (e.g., tents and sleeping bags), and other daily use items.The bulk of a zipper consists of two strips of fabric tape, each affixed to one of the two pieces to be joined, carrying tens or 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.[2] 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 its movement. Some zips have two slides, allowing variation in the opening's size and position. In most jackets and similar garments, the opening is closed entirely when one slide is at each end. In most baggage, the opening is closed entirely when the two slides are next to each other at any point along the zipper.
   Types of zipper materials
Coil zipper chain Metal zipper Nylon zipper Plastic zipper Zipper sliders Zipper pullers Zipper Stops Special zippers
   Types of zipper function
Closed-end ---Trouser Type
Use for pants, sleeves on leather jackets, purses, tents, or any application where a single slider, one-way Closed end zipper is needed.
Open-end---Jacket Type
Typically used on the front of jackets, can also be used on any items that require the zipper halves to fully detach from each other.
Tu-Way Open End---Zipper with double sliders ---Jacket Type ---"arranged in bottom-to-bottom relation"
This Zipper has two slides and can be opened from the top and/or the bottom. Great type of zipper for heavy winter coats where more leg room may be needed for driving the car, while still keeping the top slider zipped up. The zipper halves will completely separate just like a standard jacket zipper.
Zipper with double sliders ---Bag Type---"arranged in head-to-head relation"
This zipper works well for bags or any application that would benefit from a zipper that is closed at each end but allows for quick access by having two sliders. When zipper is closed, the sliders meet in the middle (or at any point on the zipper).
Coverall --"Two-way separator"
As the name implies, this zipper is used on coveralls (overalls). One end is open and one end is closed. This zipper may be used on the legs of coveralls or used as the front zipper in coveralls.
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