Raised Lift-End Pull Tabs Using Ear-Carry Progressive Dies
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Solution Overview
Problem
The existing manufacturing methods for pull tabs with raised lift ends, such as the nose carry progressive die technique, are costly and intricate, making it challenging to produce pull tabs with enhanced user accessibility while minimizing machinery modifications.
Innovation Solution
A method using the ear carry progressive die technique, which integrates a lift station into the tab die to create upward bends, allowing for the production of pull tabs with raised lift ends using existing machinery infrastructure, thereby reducing costs and downtime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If nose carry progressive die technique is used to produce pull tabs with raised lift ends, then user accessibility is enhanced, but manufacturing cost and machinery complexity increase significantly
Solution Approach 1:
Instead of using the conventional nose carry method where the nose portion carries the tab through the manufacturing line, this patent inverts the approach by using ear carry method where the lift portion (ear) carries the tab. This inversion allows the raised lift end feature to be achieved while maintaining compatibility with existing ear carry progressive die machinery, avoiding the need for costly and complex nose carry equipment modifications.
2Ease of operation
If nose carry progressive die technique is used to produce pull tabs with raised lift ends, then user accessibility is enhanced, but production downtime and retrofitting costs increase
Solution Approach 1:
The patent applies universality by designing the pull tab with a raised lift end that can be manufactured using the existing ear carry progressive die method, which is already widely used in the industry. This allows the same machinery infrastructure to produce both traditional and enhanced pull tabs without requiring dedicated nose carry equipment, thereby eliminating production downtime and retrofitting costs.
3Productivity
If ear carry method is used to manufacture pull tabs, then manufacturing efficiency is maintained, but raised lift end feature cannot be achieved
Solution Approach 1:
The patent segments the pull tab into distinct functional zones: the lift portion (ear) that is raised to provide enhanced user accessibility, the center portion that maintains the carrier attachment points for ear carry manufacturing, and the nose portion that pierces the can lid. This segmentation allows the raised lift end feature to be achieved while maintaining compatibility with the ear carry progressive die manufacturing process.
Data Source
AI summary
A progressive die manufacturing method for producing pull tabs with raised lift ends for beverage containers utilizes an ear carry process, producing tab blanks from a carrier sheet fixed by carrier strips at attachment points. At a tab station, blanks are formed into pull tabs with specific features including a nose, rivet receiving portion, lift portion, and preferably a finger hole. A lift station creates deformations elevating the lift portion relative to a highest continuous surface of the pull tab, prior to any deformations or bends. The carrier strips are then cut to release the finished pull tabs. Optional enhancements include an integrated or modular lift station, specific bending angles and distances, and a center bar for indicia application. This method combines the benefits of the ear carry process with improved ergonomics, enhancing user experience while minimizing machinery modifications.