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When opening a resealable bottle cap, two stages of force are applied: when starting to twist the cap and when breaking the bridge (the connection between the cap body and the ring).
In conventional designs, the force required to break the bridge (second torque) is greater than the force required to start twisting the cap (first torque). This creates the challenge of stopping the opening process before the bridge is completely broken. If the can is stored or carried sideways in this condition, there is a risk of liquid leakage.
By narrowing the width of the bridge, it is now possible to break the bridge with less force than conventional products. However, to resolve the issue of bridge breakage caused by post-filling tightening due to the narrowed width, the bridge section was curved to improve resistance to bridge breakage.
Conventional products, which are flat, create a load on the bridge due to axial compression and tension during the tightening process. By curving the bridge, this product introduces flexibility to counteract axial compression and tension, preventing excessive load during tightening.
