Container Cap Slit Reinforcement for Secure Sealing

The patent applies local quality by providing worked portions (such as recesses or protrusions) at specific locations along the slit, particularly at the upper end closer to the top plate. These localized structural modifications reinforce the slit area without affecting the overall slit length or pressure release function, thereby preventing deformation during corner drawing while maintaining the long circumferential length needed for effective pressure release.

The patent applies preliminary anti-action by pre-forming worked portions (recesses or protrusions) at the slit upper end before the capping process. These pre-formed structural features create resistance against the deformation forces that will be applied during corner drawing, thereby preventing slit deformation while allowing the corner drawing process to proceed for secure cap attachment.

The patent applies merging by integrating the worked portions (recesses or protrusions) directly into the cap body during the same forming process, rather than adding them as separate components. This integration maintains structural integrity and prevents slit deformation while avoiding the complexity of additional parts, assembly steps, or separate manufacturing processes.