Bottle caps and closures are, simply stated, the device that seals the contents inside of a bottle, protecting those contents from dust, spilling, evaporation, and/or from the atmosphere itself. The finish and closure are interrelated entities of any bottle. The closure must conform to the finish in order to function, and vice versa. The invention of some closures correspond to certain finishes and a closure may be adapted to old finishes; or both the finish and closure are invented together.
Bottle caps and closures can come in a variety of styles like cork, metal, plastic, etc.
Purpose of bottle caps and closures:
Many containers and packages require a means of closing. Depending on the contents and container, bottle caps and closures have several functions:
Closures keeps the container closed and the contents contained for the specified shelf life until time of opening, they provide a barrier to dirt, oxygen, moisture, etc.
Closures keep the product secure from undesired premature opening.
Provide a means of reclosing or reusing the container.
Assist in dispensing and use of product.
Allow reasonable ease to open the container by the intended user. The force or torque required to open a closure is an important consideration for packaging engineers.
Many types of packaging with their closures are used for strength, safety, security, communication, recycling, and environmental requirements.
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