vetoketjukiinnitys

Vetoketjukiinnitys, commonly known as a zipper in English, is a fastening device used to join two edges of fabric or other flexible materials. It consists of two parallel rows of teeth, typically made of plastic or metal, that interlock when a slider is moved along them. The slider is usually attached to a pull tab, which allows for easy manipulation of the zipper.

The basic principle of a zipper involves interlocking teeth. One side of the zipper tape has teeth on its outer edge, while the other side has teeth on its inner edge. As the slider moves upwards, it guides these teeth into each other, creating a secure closure. When the slider moves downwards, it separates the teeth, allowing the material to be opened.

Zippers are widely used in clothing, bags, luggage, tents, and many other applications where a convenient and secure fastening is required. They offer advantages over buttons or laces in terms of speed of operation and the ability to create a continuous, tight seal. The design and materials of zippers can vary significantly depending on their intended use, with some being robust and heavy-duty for outdoor gear, while others are delicate and decorative for fashion items. The invention of the modern zipper is credited to Gideon Sundback in the early 20th century, although earlier concepts existed.