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A screw cap or closure is a common type of closure for
bottle A bottle is a narrow-necked container made of an impermeable material (such as glass, plastic or aluminium) in various shapes and sizes that stores and transports liquids. Its mouth, at the bottling line, can be sealed with an internal stop ...
s,
jar A jar is a rigid, cylindrical or slightly conical container, typically made of glass, ceramic, or plastic, with a wide mouth or opening that can be closed with a lid, screw cap, lug cap, cork stopper, roll-on cap, crimp-on cap, press-on cap ...
s, and
tube Tube or tubes may refer to: * ''Tube'' (2003 film), a 2003 Korean film * ''The Tube'' (TV series), a music related TV series by Channel 4 in the United Kingdom * "Tubes" (Peter Dale), performer on the Soccer AM television show * Tube (band), a ...
s.


Usage

A screw closure is a mechanical device which is screwed on and off of a "finish" on a
container A container is any receptacle or enclosure for holding a product used in storage, packaging, and transportation, including shipping. Things kept inside of a container are protected on several sides by being inside of its structure. The term ...
. 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. Some closures need to be tamper resistant and have
child-resistant packaging Child-resistant packaging or CR packaging is special packaging used to reduce the risk of children ingesting hazardous materials. This is often accomplished by the use of a special safety cap. It is required by regulation for prescription drugs, o ...
features. A
tamper-evident band A tamper-evident band or security ring serves as a tamper resistant or tamper evident function to a screw cap, lid, or closure. The term ''tamper-proof'' is sometimes used but is considered a misnomer given that pilfering is still technic ...
is a common tamper warning for screw caps of bottles, for example.


Wine industry

Screw caps' use as an
alternative Alternative or alternate may refer to: Arts, entertainment and media * Alternative (''Kamen Rider''), a character in the Japanese TV series ''Kamen Rider Ryuki'' * ''The Alternative'' (film), a 1978 Australian television film * ''The Alternative ...
to
cork Cork or CORK may refer to: Materials * Cork (material), an impermeable buoyant plant product ** Cork (plug), a cylindrical or conical object used to seal a container ***Wine cork Places Ireland * Cork (city) ** Metropolitan Cork, also known as G ...
for sealing wine bottles is gaining increasing support. A screw cap is a
metal A metal (from Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typica ...
cap that screws onto threads on the neck of a
bottle A bottle is a narrow-necked container made of an impermeable material (such as glass, plastic or aluminium) in various shapes and sizes that stores and transports liquids. Its mouth, at the bottling line, can be sealed with an internal stop ...
, generally with a metal skirt down the neck to resemble the traditional wine capsule ("foil"). A layer of plastic (often
PVDC Polyvinylidene chloride, or polyvinylidene dichloride (PVDC), is a homopolymer of vinylidene chloride. History Ralph Wiley accidentally discovered polyvinylidene chloride polymer in 1933. He, then, was a college student who worked part-time at D ...
), cork, rubber, or other soft material is used as wad to make a seal with the mouth of the bottle.


Sake industry

Sake bottles are almost universally closed with screw caps (some are packed in barrels, or novelty bottles).


See also

*
Bottle cap A bottle cap or bottle top is a closure for the top opening of a bottle. A cap is sometimes colourfully decorated with the logo of the brand of contents. Plastic caps are used for plastic bottles, while metal with plastic backing is used for ...
*
Child-resistant packaging Child-resistant packaging or CR packaging is special packaging used to reduce the risk of children ingesting hazardous materials. This is often accomplished by the use of a special safety cap. It is required by regulation for prescription drugs, o ...
*
Closure & Container Manufacturers Association The Closure & Container Manufacturers Association (CCMA) is a United States trade association of manufacturers who produce closures and containers. Only manufacturers of plastic containers are represented in the association, although this ma ...
*
Closure (container) A closure is a device used to close or seal a container such as a bottle, jug A jug is a type of container commonly used to hold liquids. It has an opening, sometimes narrow, from which to pour or drink, and has a handle, and often a pouring ...
*
Flip-top A flip-top, swing-top, lightning toggle, or Quillfeldt stopper (after the inventor, Charles de Quillfeldt) is a type of closure frequently used for bottles containing carbonated beverages, such as beer or mineral water. The mouth of the bottle i ...
* Packaging *
Permeation In physics and engineering, permeation (also called imbuing) is the penetration of a permeate (a fluid such as a liquid, gas, or vapor) through a solid. It is directly related to the concentration gradient of the permeate, a material's intrins ...
*
Screw cap (wine) A screw cap is a metal, normally aluminium, cap that screws onto threads on the neck of a wine bottle, generally with a metal skirt down the neck to resemble the traditional wine capsule ("foil"). A layer of plastic (often PVDC), cork, rubber, o ...
* GPI container finish standards which includes screw caps for glass containers.


Sources

* Soroka, W, "Fundamentals of Packaging Technology", IoPP, 2002, * Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, *Prlewe, J. ''Wine from Grape to Glass''. NY: Abbeville Press, 1999. * Wayne J. Mortensen and Brian K. Marks
The Failure of a Wine Closure Innovation: A Strategic Marketing Analysis
*
ASTM ASTM International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, an ...
D3474 Standard Practice for Calibration and Use of Torque Meters Used in Packaging Applications


External links



New Zealand Screw Cap Initiative {{Authority control Wine packaging and storage Packaging