Screw cap

A screw cap or closure is a common type of closure for bottles, jars, and tubes.

Common screw closures (from left to right): Plastic bottle with plastic screw cap, Dispensing closure for salad dressing (with inner seal), Break-away closure for syrup, Dispensing pump closure, Dispensing closure (with inner seal), Spray pump, Metal closure on glass jar, Child resistant closure, Cap on toothpaste, Measuring cap

A "sports cap", which appears on many water bottles, seen in closed configuration at left and in open configuration at right, allowing the water to pass around the central blue piece.

Usage

plastic screw cap with break-away tamper-evident band

A screw closure is a mechanical device which is screwed on and off of a "finish" on a container. 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 features. A tamper-evident band is a common tamper warning for screw caps of bottles, for example.

Wine industry

Screw caps' use as an alternative to cork for sealing wine bottles is gaining increasing support. A screw cap is a metal cap that screws onto threads on the neck of a bottle, generally with a metal skirt down the neck to resemble the traditional wine capsule ("foil"). A layer of plastic (often PVDC), 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).

Sources

Soroka, W, "Fundamentals of Packaging Technology", IoPP, 2002, ISBN 1-930268-25-4
Yam, K. L., "Encyclopedia of Packaging Technology", John Wiley & Sons, 2009, ISBN 978-0-470-08704-6
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 D3474 Standard Practice for Calibration and Use of Torque Meters Used in Packaging Applications

External links

New Zealand Screw Cap Initiative

Packaging
General topics	Active packaging Child-resistant packaging Contract packager Edible packaging Modified atmosphere/modified humidity packaging Package pilferage Package testing Package theft Packaging engineering Resealable packaging Reusable packaging Reuse of bottles Shelf life Shelf-ready packaging Shelf-stable Sustainable packaging Tamper-evident Tamper resistance Wrap rage
Product packages	Alternative wine closure Beer bottle Box wine Case-ready meat Coffee bag Cosmetic packaging Currency packaging Disposable food packaging Drink can Egg carton Evidence packaging Field ration Flour sack Foam food container Food packaging Fuel container Gas cylinder Glass milk bottle Growler Juicebox Low plastic water bottle Luxury packaging Milk bag Optical disc packaging Oyster pail Popcorn bag Pharmaceutical packaging Plastic milk container Sand bag Self-heating food packaging Screw cap (wine) Single-serve coffee container Water bottle Wine bottle
Containers	Aerosol spray Aluminium bottle Aluminum can Ampoule Antistatic bag Bag-in-box Bag Barrel Biodegradable bag Blister pack Boil-in-bag Bottle Box Bulk box Cage Case Carboy Carton Chub Clamshell Corrugated box design Crate Disposable cup Drum Endcap Envelope Flexible intermediate bulk container Folding carton Glass bottle Gunny sack Inhaler Insulated shipping container Intermediate bulk container Jar Jerrycan Jug Keg Mesh bag Multilayered packaging Multi-pack Packet (container) Padded envelope Pail Paper bag Paper sack Plastic bag Plastic bottle Retort pouch Sachet Squround Security bag Self-heating can Shipping container Skin pack Spray bottle Stand-up pouch Steel and tin cans Tetra Brik Thermal bag Tub (container) Tube Unit load Vial Wooden box
Materials and components	Adhesive Aluminium foil Bail handle Bioplastic Biodegradable plastic BoPET Bubble wrap Bung Cellophane Closure Coated paper Coating Coextrusion Corrugated fiberboard Corrugated plastic Cushioning Desiccant Double seam Flip-top Foam peanut Gel pack Glass Hot-melt adhesive Kraft paper Label Lid Linear low-density polyethylene Liquid packaging board Low-density polyethylene Metallised film Modified atmosphere Molded pulp Nonwoven fabric Overwrap Oxygen scavenger Package handle Packaging gas Pallet Paper Paper pallet Paperboard Plastic-coated paper Plastic film Plastic pallet Plastic wrap Polyester Polyethylene Polypropylene Pressure-sensitive tape Pump dispenser Screw cap Screw cap (wine) Security printing Security tape Shock detector Shock and vibration data logger Shrink wrap Slip sheet Staple (fastener) Strapping Stretch wrap Susceptor Tamper-evident band Tear tape Temperature data logger Time temperature indicator Tinplate Velostat
Processes	Aseptic processing Authentication Automatic identification and data capture Blow fill seal Blow molding Calendering Canning Coating Containerization Converting Corona treatment Curtain coating Die cutting Die forming (plastics) Electronic article surveillance Extrusion Extrusion coating Flame treatment Glass production Graphic design HACCP Hermetic seal Induction sealing Injection moulding Lamination Laser cutting Molding Package tracking Papermaking Plastic welding Plastics extrusion Printing Product development Production control Quality assurance Radio-frequency identification Roll slitting Shearing (manufacturing) Thermoforming Track and trace Vacuum forming Ultrasonic welding Vacuum packaging Verification and validation
Machinery	Barcode printer Barcode reader Bottling line Calender Can seamer Cartoning machine Case sealer Check weigher Conveyor system Drum pump Extended core stretch wrapper Filler Heat gun Heat sealer Industrial robot Injection molding machine Label printer applicator Lineshaft roller conveyor Logistics automation Material-handling equipment Mechanical brake stretch wrapper Multihead weigher Orbital stretch wrapper Packaging machinery Palletizer Rotary wheel blow molding systems Shrink tunnel Staple gun Tape dispenser Turntable stretch wrapper Vertical form fill sealing machine
Environment, post-use	Biodegradation Environmental engineering Glass recycling Industrial ecology Life-cycle assessment Litter Packaging waste Paper recycling Plastic recycling Recycling Reusable packaging Reverse logistics Source reduction Sustainable packaging Waste management
Category: Packaging

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