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Closures are devices and techniques used to close or seal a bottle, jug, jar, tube, can, etc. Closures can be a cap, cover, lid, plug, etc. Other types of containers such as boxes and drums may also have closures but are not discussed in this article. ==Purpose of closures== Many containers and packages require a means of closing. It can be a separate device or seal or sometimes an integral latch or lock. Depending on the contents and container, closures have several functions: * Keep the container closed and the contents contained for the specified shelf life until time of opening * Provide a barrier to dirt, oxygen, moisture, etc. Control of permeation is critical to many types of products: foods, chemicals, etc. * 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. Difficult to open containers may cause wrap rage. The force or torque required to open a closure is an important consideration for packaging engineers. Many types of packaging with their closures are regulated for strength, safety, security, communication, recycling, and environmental requirements. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Closure (container)」の詳細全文を読む スポンサード リンク
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