Which manufacturing method is commonly used for creating plastic bottle caps?

The commonly used manufacturing method for creating plastic bottle caps is injection moulding. This process involves injecting molten plastic into a mould under high pressure, allowing for the precise shaping of intricate designs such as the threads or seals found on bottle caps. Injection moulding is highly efficient for mass production, offering quick cycle times and the ability to produce a large number of identical parts.

It is particularly well-suited for bottle caps as it can achieve the fine details and tight tolerances required for a secure fit, which is crucial for maintaining the integrity of the packaging. The durability and size consistency provided by injection moulding make it the preferred choice for manufacturers looking to create high-quality plastic components like bottle caps.

Other methods such as compression moulding, extrusion, and vacuum forming are less effective for this particular application due to their limitations in achieving the necessary complexity, detail, or material properties required for functional bottle caps.