Coin Wrapper Sheet With Pull Tab For Easy Opening
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Solution Overview
Problem
Conventional coin wrapper sheets are difficult to open and release coins without causing damage, as the crimped ends resist unwrapping and require forceful methods like striking or cutting, making it hard to access the coins.
Innovation Solution
A coin wrapper sheet design featuring a leading 'W'-shaped profile with a protruding tab on the trailing edge, allowing easy gripping and pulling to open the sheet, and a concave indent on the leading edge for smooth feeding into machines, enabling secure wrapping and easy release of coins without adhesives or glues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coin wrapper sheet is tightly crimped to secure the coins, then the reliability of securing coins is improved, but the ease of operation to open the wrapper deteriorates
Solution Approach 1:
The trailing end of the wrapper sheet is segmented into a tab portion that can be easily pulled, separating the opening function from the securing function. The tab is formed by cutting or tearing the trailing end to create a distinct pulling element that does not require forceful striking or cutting of the entire wrapper.
Solution Approach 2:
The tab portion is extracted from the trailing end of the wrapper sheet to serve as a dedicated opening mechanism. This extracted tab can be easily gripped and pulled to initiate unwrapping, while the rest of the wrapper maintains its secure crimped structure around the coins.
2Manufacturing precision
If the trailing end is cut with a V-shape to fit the machine, then the manufacturing precision for machine wrapping is improved, but the ease of operation to open the wrapper deteriorates
Solution Approach 1:
The trailing V-shaped end is segmented to include a tab portion that protrudes from the V-shape. This tab is created by making a cut or tear that extends partway into the V-shape, creating a distinct pulling element separate from the crimped portions that engage with the machine.
Solution Approach 2:
Different portions of the trailing end have different qualities: the V-shaped legs are designed for machine engagement and crimping, while the tab portion is designed for easy manual pulling. The tab has a different structural property (being unc crimped and protruding) that makes it suitable for the opening operation.
Data Source
AI summary
An improved coin wrapper sheet for machine or hand wrapping a stack of like-diameter coins includes one or more tabs that can be easily gripped and pulled by the user to open the coin wrapper and release the coins.