Frangible Drum Closure Cap with Tamper-Evident Tear Strip
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Solution Overview
Problem
Current drum closure caps or overseals are easily removable and reusable, lacking sufficient security features to prevent unauthorized access, and their removal methods can be hazardous due to the use of sharp tools.
Innovation Solution
A cap design featuring a frangible connection that remains attached to the container upon removal, utilizing a snap-fit engagement and tear-strip mechanism to ensure the cap top and attachment ring remain connected, preventing loss and providing tamper evidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a plastic snap-on cap or overseal is used for drum closure, then the hand application is simple and relatively effortless, but the cap can be easily pried off in an undetected manner when warmed, lacking sufficient security
Solution Approach 1:
The cap is divided into two functional parts: a reusable cap body that can be manually applied and removed, and a frangible connection element (tear strip or frangible ring) that breaks upon unauthorized removal attempts. This segmentation allows the cap to be easily applied while preventing undetected removal, as the frangible portion provides tamper evidence.
Solution Approach 2:
The frangible connection element is pre-installed and positioned to break only upon removal attempts. This preliminary setup ensures that any unauthorized access attempt automatically leaves visible evidence through the broken frangible portion, without requiring additional monitoring or detection systems.
2Reliability
If sharp cutting or puncturing implements are used to remove the overseal in an authorized manner, then subsequent replacement is prevented, but injury or accidental damage to the underlying closure is likely
Solution Approach 1:
The frangible connection element is designed as a disposable component that breaks during authorized removal. Instead of using dangerous sharp tools, the frangible portion (tear strip or frangible ring) is intentionally designed to fracture, providing tamper evidence and preventing reuse without requiring hazardous removal methods. The broken frangible element clearly indicates that the cap has been removed and cannot be reattached in its original form.
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 cap design enhances security by ensuring the attachment means are not lost and provides a visible tamper-evidencing mechanism, preventing unauthorized reapplication and reducing the risk of injury from sharp tools during removal.
Implementation Method 1
a frangible connection between the cap top and the attachment means designed, in use, to be broken upon removal or attempted removal of the cap from said container
Implementation Method 2
utilizing a snap-fit engagement and tear-strip mechanism to ensure the cap top and attachment ring remain connected
Data Source
AI summary
A cap for a container closure or closure plug includes a cap top having a top surface and a bottom surface, and an attachment ring extending axially downward from the bottom surface of the cap top under a central portion of the cap top. The attachment ring is securingly engageable with a container closure or closure plug. The attachment ring includes a cam surface extending radially outward from the attachment ring, where the cam surface deflects the attachment ring radially inward upon engagement of the attachment ring with the container closure or closure plug. The cap top and the attachment ring are connected by at least one frangible connection and at least one permanent connection, where the at least one permanent connection retains the cap top in one piece upon breaking of the at least one frangible connection for removal of the cap from the container closure or closure plug.