Zip-fastener (or snake-lock ) - a type of fastener , the principle of operation resembling a simplified zipper . Unlike "lightning" provides a lap joint, and not butt. It differs in the smooth movement of the slider (slider), since it has no teeth, and the connection and disconnection is ensured by pressing one of the guides of a special profile made of flexible material (usually plastic ) into another.
Due to the absence of teeth, the “snake” is cheaper and easier to manufacture and less likely to fail than the “lightning”, but is practically unrepairable and can withstand less tensile strength. This clasp is mainly used in clerical work, and more recently (around the 1980s and 1990s ) it has become widespread in the manufacture of cheap handbags , wallets and other haberdashery goods .
History
Widespread in China , around the 1990s .
See also
- Velcro