Can lid shell, manufacturing method for same, and forming device

The can lid shell with enhanced curved surfaces and a forming device addresses buckling issues by increasing mechanical strength and pressure resistance, preventing leakage and maintaining structural integrity under high internal pressures.

US20250360553A1Pending Publication Date: 2025-11-27SHINGURYO TAKURO
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Patent Information

Application Number
US18/855575
Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Priority Date
2023-01-18
Filing Date
2023-07-21
Publication Date
2025-11-27

AI Technical Summary

Technical Problem

Existing can lids are prone to buckling and leakage due to excessive internal pressure, especially when exposed to high temperatures, leading to cracks and loss of contents.

Method used

A can lid shell design featuring a panel section with a countersink section and chuck wall section, incorporating curved surfaces with varying orientations and thicknesses to enhance mechanical strength and pressure resistance, along with a forming device that thickens specific portions of the lid during manufacturing.

Benefits of technology

The design prevents buckling and improves pressure resistance, ensuring the lid maintains structural integrity under high internal pressures without increasing weight or thickness significantly.

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Abstract

A can lid shell 10 includes a panel section 11 having a circular peripheral edge, a countersink section 12 formed and recessed along the peripheral edge of the panel section 11, a chuck wall section 13 rising from an edge of the countersink section 12, and a flange section 14 protruding from an upper end of the chuck wall section 13. The countersink section 12 includes a first curved surface portion 123C that is convex toward an internal space SP1. The chuck wall section 13 includes a second curved surface portion 131 that is connected to the first curved surface portion 123C and that is concave toward the internal space SP1. Furthermore, the second curved surface portion 131 and the first curved surface portion 123C are formed to be thicker as both are directed from an edge p8 on the flange section 14 side to an edge p6 on the panel section 11 side.
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