Full-Open Can Lid Seaming for Drinking Comfort and Seal Stability
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Solution Overview
Problem
Conventional can lids for foamed beverages, such as stay-on tab type lids, restrict the drinking experience due to a smaller opening size, making it uncomfortable to drink from glasses or mugs.
Innovation Solution
A full-open type can lid with a disk-shaped panel, a ring-shaped groove, and a tab that breaks a score line to allow the panel to open fully, is used in conjunction with a manufacturing apparatus that includes a knockout pad to seam the lid to the can body, ensuring a stable and secure seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a stay-on tab type can lid with a smaller opening portion is used, then the can lid structure is simpler and easier to manufacture, but the drinking comfort is reduced and cannot experience drinking with a glass or mug
Solution Approach 1:
The can lid is divided into a panel portion and a flange portion separated by a groove portion. The panel portion can be fully opened by breaking the score line, while the flange portion remains to maintain the seal with the can body. This segmentation allows the opening to be enlarged for better drinking comfort while maintaining structural integrity and ease of manufacture.
2Ease of operation
If a full-open type can lid with an opening portion in the entire panel portion is used, then the drinking comfort is improved, but the sealing reliability during seaming may be compromised
Solution Approach 1:
The groove portion acts as an intermediary element between the panel portion and the flange portion. It provides a clear separation that allows the panel to be fully opened while maintaining the flange's sealing function. The groove ensures that during seaming, the flange portion properly engages with the can body flange, maintaining sealing reliability even with the full-open panel design.
3Ease of manufacture
If the panel portion is pressed by a knockout pad during seaming, then the seaming process is simplified, but the upper surface portion of the panel may interfere with the knockout pad operation
Solution Approach 1:
By segmenting the can lid into panel and flange portions with a groove portion in between, the invention allows the knockout pad to press the flange portion for seaming without interference from the panel portion. The groove creates spatial separation that enables independent operation of the knockout pad on the flange while the panel remains positioned above it.
Data Source
AI summary
According to one aspect of the present invention, a method for manufacturing a can container includes: covering a can body with a can lid including a disk-shaped panel portion in which a score line is formed on an outer peripheral edge side, a flange portion seamed to the can body, a ring-shaped groove portion provided between the panel portion and the flange portion and protruding downward, and a tab that is provided in the panel portion, breaks the score line, and allows the panel portion to open along the score line; pressing an upper surface portion of the panel portion located on an outer side of the score line in a radial direction and above the score line with a knockout pad; and seaming the can lid pressed by the knockout pad and the can body.