closure is a mechanical device which is screwed on and off a threaded "finish" on a container. Either continuous threads (C-T) or lugs are used. Metal caps can be either preformed, or, in some instances, rolled on after application. Plastic caps may use several types of molded polymer.

Some screw tops have multiple pieces. For example, a mason jar often has a lid with a built in rubbery seal and a separate threaded ring or band.

Crown cap

Beverage bottles are frequently closed with

1.Previous
3.Next