Tamper-Evident Pull-Tab With Bend Arrangement
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Solution Overview
Problem
Existing tamper-evident containers do not reliably indicate if the food inside has been contaminated, as the pull-tab often returns to its original position after opening, making it difficult for consumers to determine if the container has been tampered with.
Innovation Solution
A pull-tab assembly with a hold-down mechanism and a bend arrangement that keeps the tab at an upward incline after the first use, featuring a joint that tears upon opening, ensuring the tab remains pivoted up and providing additional bends for durability and visibility of tampering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple pull-tab is used to open the container lid, then the ease of operation is improved, but the reliability of tamper indication deteriorates because the tab returns to its original position after opening
Solution Approach 1:
The tab is segmented into multiple sections with bends that create distinct positional states. The tab includes a first section, second section, and third section with bends between them, allowing the tab to maintain a visibly elevated position after opening while still being operable. This segmentation enables the tab to function both as an opening mechanism and as a permanent tamper indicator.
2Reliability
If the tab is made rigid to maintain an upward incline after opening, then the reliability of tamper indication is improved, but the ease of operation deteriorates because the tab becomes difficult to pull
Solution Approach 1:
The tab incorporates a hinge connection at its base that allows it to pivot between a lowered closed position and an elevated open position. This dynamic hinge mechanism enables the tab to be easily pulled during opening while maintaining a stable elevated position afterward, resolving the contradiction between operability and indication reliability.
Solution Approach 2:
The tab includes bends that change its structural parameters along its length. The first bend creates a pivot point that allows movement, while subsequent bends maintain rigidity in the upper portion to ensure the tab remains elevated. This parameter variation enables both ease of pulling and reliable indication.
3Reliability
If the tab is preformed with bends to remain pivoted up after opening, then the reliability of tamper indication is improved, but the device complexity increases
Solution Approach 1:
The tab structure merges multiple functions into a single component: it serves as the opening lever, the hinge connection, and the tamper indicator simultaneously. The bends in the tab are formed as integral features during manufacturing, combining the structural reinforcement needed for indication with the pivot mechanism in one unified element, thereby reducing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents the pull-tab from returning to its original position, clearly indicating if the container has been opened, thus ensuring food safety by maintaining the tab at an upward incline, making it evident if the container has been tampered with.
Implementation Method 1
a bend arrangement is introduced into the tab. The bend arrangement preferably includes a plurality of bends to assure that the tab tends to pivot up
Implementation Method 2
The hold-down is preferably joined to the tab by a joint that can be torn when the lid is first opened. The torn joint frees the tab so the tab can be pulled to open the container
Implementation Method 3
The enlargement is pressed down into an undercut recess in the lid to lock the hold-down in the undercut recess
Data Source
AI summary
A tamper-evident container has a lid (14) that can be opened only by lifting and pulling a tab (18). Pulling of the tab breaks a breakable joint (41, 43, 70, FIG. 4) that connects the tab (18) to a hold-down (24) that is fixed to the lid, so when the tab is released from the hold-down the tab springs up (FIG. 2) to an upward incline J to indicate that the container was opened.