Tamper-Evident Bottle Finish and Cap Assembly
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Solution Overview
Problem
Existing bottle cap designs often feature exposed threads and tamper-resistant bands that complicate recycling, hygiene, and aesthetic design, while also being prone to contamination and difficult to open.
Innovation Solution
A two-part cap system with an inner unit that fits tightly over the bottle's circular finish and an outer cap with equally spaced indentations and a button protrusion, allowing for easy assembly and tamper-evident locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exposed threads and tamper-resistant bands are used on bottle openings, then tamper resistance and sealing are improved, but device complexity and difficulty in recycling increase
Solution Approach 1:
The cap is divided into two separate parts: an inner cap that threads onto the bottle opening and an outer cap that overlays the inner cap. The inner cap contains the tamper-evident band and sealing features, while the outer cap provides aesthetic coverage and grip features. This segmentation allows each component to be optimized for its specific function while simplifying the overall structure for recycling.
Solution Approach 2:
The tamper-evident band is extracted from the traditional continuous collar structure and reimagined as a broken band with gaps. This extraction simplifies the structure by removing unnecessary material while maintaining the tamper-evident function, as the broken nature of the band clearly indicates when the seal has been compromised.
2Reliability
If exposed threads and neck collars are present on bottle openings, then tamper resistance is improved, but hygiene and ease of cleaning are worsened
Solution Approach 1:
The outer cap is designed to completely cover and conceal the threaded opening and neck collar area. By extracting these potentially contaminating surfaces from view and contact, the design eliminates harbors for bacteria and debris while maintaining tamper resistance through the inner cap's broken band mechanism.
Solution Approach 2:
The outer cap acts as a smooth, continuous shell that covers the complex threaded interface. This thin film-like structure provides a hygienic surface that is easy to clean and does not create crevices for contamination, while the inner cap maintains the functional sealing and tamper evidence.
3Reliability
If tamper-resistant bands are attached to caps, then tamper evidence is improved, but ease of operation and environmental impact are worsened
Solution Approach 1:
The cap is segmented into removable inner and outer parts. The inner cap with the broken tamper-evident band provides clear tamper indication, while the outer cap can be easily removed and discarded after use. This segmentation makes operation easier by allowing the outer cap to be separated without resistance.
Solution Approach 2:
The outer cap is designed as a disposable component that is easily removed and discarded after the bottle is opened. This eliminates the need for complex mechanisms to remove persistent tamper bands, improving ease of operation while reducing environmental impact through simpler disposal.
4Device complexity
If traditional single-cap designs are used, then device complexity is reduced, but tamper evidence and aesthetic quality are worsened
Solution Approach 1:
The cap is divided into an inner cap that provides tamper evidence through its broken band design and an outer cap that provides aesthetic coverage. This segmentation achieves both tamper evidence reliability and aesthetic quality without excessive complexity, as each component has a dedicated function.
Solution Approach 2:
The inner and outer caps are designed to work together as an integrated system. The inner cap's tamper-evident features combine with the outer cap's aesthetic features to create a complete solution that satisfies both functional and visual requirements while maintaining reasonable manufacturing complexity.
Data Source
AI summary
A bottle, or a generic container, for the tight storage of diverse materials, may comprise a circular lip at the top of its neck finish or opening with an inferiorly disposed smooth, slanted and curved outer surface that is punctuated by equally spaced indentations and that may extend outwards and stepwise downwards, first through a vertical and then a convex surface and finally to a smooth surface on which may be disposed a button protrusion. A tightly sealed finish may be characterized by its lip and the equally spaced protruding lugs disposed on its inner surface interacting tightly with threading and other parts of the inner part of a reusable aggregate cap which, in turn, may inextricably couple with an outer part on whose outer annular flange surface may be disposed a button marker protrusion that, because of inaccessible features and mechanisms on the cap units, may only align with the one on the outer surface of the finish or opening of an unopened bottle or container. Determination of whether a tightly capped container has been previously opened or tampered with, may quickly be performed, either visually or through touch, by checking the alignment, or not, of the externally exposed button protrusions.