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Ascrew cap orclosure is a common type ofclosure forbottles,jars, andtubes.
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The first screw-on lid was patented in 1858 byJohn Landis Mason for a jar that became known as theMason jar.[1]
A screw closure is a mechanical device which is screwed on and off of a "finish" on acontainer.[2] Either continuous threads or lugs are used. It must be engineered to be cost-effective, to provide an effective seal (and barrier), to be compatible with the contents, to be easily opened by the consumer, often to be reclosable, and to comply with product, package, and environmental laws and regulations. Manufacturers may ensure the integrity of a screw cap using acap torque tester. Some closures need to betamper resistant and havechild-resistant packaging features. Atamper-evident band is a common tamper warning for screw caps of bottles, for example.
Screw caps' use as analternative tocork for sealingwine bottles is gaining increasing support. A screw cap is ametal cap that screws onto threads on the neck of abottle, generally with a metal skirt down the neck to resemble the traditionalwine capsule ("foil"). A layer ofplastic (oftenPVDC), cork,rubber, or other soft material is used as wad to make a seal with the mouth of the bottle.
Sake bottles are almost universally closed with screw caps (some are packed in barrels, or novelty bottles).
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