Dispensing Closure With Predetermined Weakness Zone
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Solution Overview
Problem
Existing dispensing closures for containers with unthreaded finishes can be easily removed and reapplied, allowing for the potential substitution of inferior products, which compromises brand integrity in packaging applications like restaurant ketchup and mustard containers.
Innovation Solution
A dispensing closure with a downwardly depending sidewall and a locking structure that engages the container's retention structure, featuring a predetermined area of weakness that ruptures upon attempted removal, preventing successful reapplication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dispensing closure includes locking structure that engages the retention structure, then the closure becomes difficult to remove from the container, but it can still be removed with great force and reapplied
Solution Approach 1:
The sidewall is segmented into two functional zones: an upper portion with normal structural integrity for sealing and a lower predetermined area with reduced thickness for controlled rupture. This segmentation allows the closure to maintain retention during normal use while enabling permanent damage upon forced removal attempts.
Solution Approach 2:
The wall thickness parameter is varied within the sidewall structure. The predetermined area of weakness has a reduced thickness parameter compared to the rest of the sidewall, creating a controlled failure point that ruptures under removal force while preserving the overall closure integrity during normal operation.
2Reliability
If a dispensing closure is designed to be securely attached to prevent removal, then brand integrity is maintained, but the closure cannot be reapplied after removal
Solution Approach 1:
A predetermined area of weakness is built into the sidewall structure during manufacturing, positioned to rupture when removal force is applied. This preliminary structural feature ensures that any attempt to remove the closure will permanently damage it, preventing reapplication and ensuring product integrity.
Solution Approach 2:
The potential harm of closure removal is converted into a beneficial security feature. The predetermined weakness area is designed to rupture under removal force, transforming the act of removal into a permanent disabling action that prevents refilling and protects against product substitution.
3Ease of manufacture
If the sidewall has uniform thickness throughout, then manufacturing is simplified, but the closure can be removed and reapplied
Solution Approach 1:
The sidewall exhibits non-uniform thickness distribution, with a locally reduced thickness area positioned to create a predetermined weakness. This local quality variation maintains relatively simple manufacturing while providing the critical anti-reapplication functionality through the concentrated weakness zone.
Data Source
AI summary
A container assembly includes a container having an unthreaded finish portion and a closure having a downwardly depending sidewall and blocking structure provided at a lower end of the sidewall for securing the closure on to the unthreaded finish portion. The sidewall is provided with a predetermined area of weakness so that in the event that an attempt is made to remove the closure from the container the predetermined area of weakness will rupture, leaving the closure with insufficient structural integrity to be successfully reapplied to the container. The container assembly has particular utility for use in packaging brand-name comestibles such as ketchup for restaurant use. It will frustrate efforts by the restaurant to replenish the brand-name comestible with a cheaper replacement within a dispensing container that is still labeled with the brand of the original product.