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Closures for containers protect the contents of bottles, cans, jars and tubes from contamination, leakage and spoilage. They are available in various designs depending on the container type, intended use and contents - whether DIN standardised or as a special closure. Here are some of the most common types of closures and their specific applications.
Closures for containers are essential devices that protect the contents of bottles, cans, jars and tubes from contamination, leakage and spoilage. They are available in different designs depending on the container type and intended use. Here are some of the most common types of closures and their specific applications:
Types of closures
Screw caps
Material: Metal or plastic
Application: Widely used for bottles (e.g. water and juice bottles) and jars (e.g. jam jars)
Functionality: Opened and closed by twisting
Twist-off closures
Special feature: Specially developed for certain applications such as wine bottles
Functionality: Similar to screw caps, but optimised for wine bottles
Snap-on closures
Material: Plastic
Application: Plastic containers and tubes
Functionality: Snap into place when closed, easy to open by lifting or pressing
Clip closures
Components: Wire clip and sealing plug
Application: Glass bottles, especially for drinks such as beer
Functionality: The wire clip is folded over to press the sealing plug firmly into place
Crown cap
Material: Metal
Application: Beer and soft drink bottles
Functionality: Pressed onto bottles and removed with a bottle opener
Cork stopper
Material: Traditionally made of cork, synthetic materials also available
Application: Mainly for wine bottles
How it works: Pressed into the bottle opening to ensure an airtight seal
Aluminium or metal foil closures
Application: Yoghurt pots, milk bottles
Functionality: Opened by pulling off
Valve closures
Application: Spray bottles, aerosol cans
Functionality: Controlled release of the contents by pressing
Stopper
Material: Rubber, silicone, plastic
Application: Frequently used in laboratories
Functionality: Pressed into the opening of the container to seal it
To the point
Closures are essential for the safe and hygienic storage of contents in various containers. The choice of the right closure depends on factors such as the material of the container, the type of contents and the desired level of airtightness and accessibility. From screw and twist closures to snap-on and swing-top closures, crown caps, corks and speciality closures such as valve closures, these devices offer tailor-made solutions for a wide range of applications.