How a Water Bottle Cap is Made

A bottle cap is a closure device that secures the contents of a container until it is ready to be used. It is typically shaped like a lid, with a small lip to prevent it from falling off and exposing the contents.

The cap usually has embossing on the top that explains how to open the bottle (in the case of medicinal bottles), or may include a company logo, slogan or address. Soda companies often use bottle caps for promotions, such as the MyCokeRewards program, which lets people enter their cap and win prizes.

Caps: Plastic Water Bottle
The manufacture of plastic bottle caps involves a process called injection moulding. In this process, thermoplastic polymer pellets are heated to the point where they become soft and flexible. Then they are injected under very high pressure into a mould, which forms them into the desired shape.

Once the caps are formed, they undergo a process of wadding and sealing to create bottle closures and caps that are durable and tough enough to last long in harsh conditions. They are then packaged and shipped to the customer or end user.

The design and development of the product requires a lot of detail, including threading, dimensions, choice of wadding and embossing, and a range of colour options. This is not only essential for the functionality of the product, but also for the quality of the finished product. It is important that the design details remain dimensionally stable as the part cools in the mould, to avoid distortion of the final shape.