Screw cap
Screw cap
A screw cap (pronounced: /skruː kæp/) is a type of closure commonly used in the packaging of certain goods, particularly in the pharmaceutical and medical industries.
Etymology
The term "screw cap" is derived from the English words "screw", which refers to a type of fastener, and "cap", which refers to a protective cover or lid. The term thus describes a cap that is fastened by a screw mechanism.
Description
A screw cap is typically made from plastic or metal and is designed to be screwed onto the top of a container, such as a bottle or jar, to seal it. The cap has a threaded design that matches the threads on the neck of the container, allowing it to be twisted on and off. This design provides a secure seal that helps to prevent leakage and contamination, making it ideal for use in the packaging of medical and pharmaceutical products.
Related Terms
- Bottle: A container with a narrow neck, typically used for storing liquids. Screw caps are often used to seal bottles.
- Jar: A wide-mouthed container made from glass or plastic. Jars may also be sealed with screw caps.
- Closure (container): A device used to seal a container. A screw cap is a type of closure.
- Thread (mechanics): A helical structure used to convert between rotational and linear movement or force. The threads on a screw cap allow it to be twisted onto the neck of a container.
- Seal (mechanical): A device that helps to prevent leakage. The screw cap acts as a seal for the container it is attached to.
External links
- Medical encyclopedia article on Screw cap
- Wikipedia's article - Screw cap
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