Nested-Cap Container Closure for Irreversible Opening Evidence
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Solution Overview
Problem
Existing closure mechanisms for containers lack effective means to prevent fraudulent refilling and tampering while providing irreversible evidence of the first opening, often being complex, unreliable, or susceptible to external manipulation.
Innovation Solution
A closure system with an inner and outer cap configuration, featuring a groove with a helical segment and an elastically deformable prolongation, where the flange moves through the groove to irreversibly block the inner and outer cap separation, accompanied by breakable means that indicate the first opening and ensure tamper-proof evidence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If breakable bridges are used to join two parts together for showing evidence of first opening, then visual evidence of opening is provided, but the mechanism is complex and may be fraudulently tampered with from the outside
Solution Approach 1:
The closure is divided into an inner cap and an outer cap as separate components. The inner cap contains the breaking means that connect it to the container, while the outer cap houses the guiding mechanism. This segmentation allows the evidence-generating function to be isolated and protected within the inner cap structure, reducing overall complexity while maintaining reliability.
Solution Approach 2:
The inner cap is nested within the outer cap, with the outer cap housing the main body of the inner cap. The groove with helical segment is formed in the outer cap and guides the flange of the inner cap. This nesting arrangement protects the internal mechanisms from external tampering while maintaining a compact structure, resolving the contradiction between reliability and complexity.
2Object-affected harmful factors
If guides are used to establish separation between two components in axial movement, then internal mechanisms are protected from external tampering, but irreversibility is difficult to ensure
Solution Approach 1:
The groove contains a helical segment that guides the flange in a curved, spiral path rather than a straight axial movement. This helical configuration ensures that once the flange reaches the perpendicular direction change and enters the housing, it cannot return to its initial position, providing reliable irreversibility while keeping the mechanism internally housed and protected from tampering.
Solution Approach 2:
The groove profile is asymmetric, with a helical segment that allows movement in one direction but creates a geometric lock in the other direction. The perpendicular direction change in the helical path creates an asymmetric configuration where the flange can advance to the housing but cannot reverse, ensuring irreversibility while maintaining internal protection.
3Reliability
If path changes in guides are used to achieve perpendicular direction change for irreversibility, then evidence of opening is provided, but the movement is not continuous and can be reverted
Solution Approach 1:
The helical segment provides a smooth, continuous curved path for the flange to follow during the opening operation. Unlike sharp angular changes, the helical geometry allows the flange to move continuously along the spiral trajectory, ensuring ease of operation while still achieving the perpendicular direction change needed for irreversibility when the flange enters the housing.
4Reliability
If teeth and catches are used for irreversibility, then opening evidence is shown, but the configuration is complex and less reliable
Solution Approach 1:
The invention extracts and eliminates the complex teeth and catches mechanism from the closure design. Instead, it uses a simplified groove with helical segment that guides the flange to a perpendicular path change, achieving irreversibility through geometric constraints rather than interlocking mechanical elements. This reduction in complexity while maintaining reliability directly addresses the contradiction.
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 system provides reliable, irreversible evidence of the first opening and prevents tampering, ensuring the closure remains secured in the altered state, while maintaining leak-tightness and preventing fraudulent refilling.
Implementation Method 1
an elastically deformable prolongation configured for restricting the section of the groove in at least one part of the helical segment, with a section smaller than what is required for the passage of the flange such that, in the operating mode, the forced passage of the flange causes the elastically deformable prolongation to bend
Data Source
AI summary
The present invention relates to a cap-type closure for containers comprising means for showing evidence of a first opening, the closure preferably being coupled to the mouth of a container. The present invention is characterized by a closure comprising an inner cap and an outer cap interconnected to one another so as to allow a spacing to be set between the two once the first opening of the closure takes place.