Open Up!Products and Services
P. P. Cap for Aluminium Bottles
Nippon Closures Co., Ltd.
Metal cap (for aluminium bottles) that breaks the bridges between the cap body and its ring when opened, indicating that the can has been opened.
•Designed to easily break the bridges when opened, making it easier to open this cap than conventional caps.
When opening a cap, two stages of torque are applied: when starting to twist the cap and when breaking the bridges.
In conventional designs, the torque required to break the bridges (second torque) is greater than that required to start twisting the cap (first torque). This creates the challenge of stopping the opening process before the bridges are completely broken. If the filled product is stored or carried sideways in this condition, there is a risk of leakage.
By narrowing the width of the bridge, it is now possible to break the bridges with less torque than conventional caps. However, to resolve the issue of bridge breakage caused by sealing the cap with the narrowed bridge after filling, the bridge section was curved to improve resistance to bridge breakage.
Conventional caps, which are flat, create a load on the bridge due to axial compression and tension during the sealing process. By curving the bridge, this cap has flexibility to counteract axial compression and tension, preventing excessive load during sealing.
