Blow-Molded Screw-Cap Container Neck for Tight Sealing

The patent changes the physical state and mechanical properties of the thin-walled neck through the screwing process itself. When the screw cap is tightened, the neck undergoes elastic deformation and work hardening, transforming from a unstable thin-walled structure to a stabilized connection. The parameter change occurs in the mechanical strength and rigidity of the neck material during the tightening process, allowing the thread connection to achieve reliable sealing despite the initial thin-walled design.

The patent employs a dynamic approach where the structural integrity of the thin-walled neck is not fixed but evolves during use. The neck starts with low structural integrity to minimize material use, but gains strength through the screwing action. The dynamic transformation occurs as the tightening force induces plastic deformation and work hardening in the neck material, converting a weak initial structure into a strengthened connection that maintains structural integrity under operational loads.

The patent implements a self-service mechanism where the thin-walled neck itself performs the strengthening function during the screwing process. Rather than requiring complex pre-forming operations or additional reinforcement structures, the neck material automatically work-hardens and stabilizes when the screw cap is tightened. This self-service approach eliminates the need for complex thread formation processes while maintaining manufacturing simplicity and cost-effectiveness.