Pressure-Responsive Drink Capsule for Delayed Opening Brewing
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Solution Overview
Problem
Existing coffee capsules face challenges in achieving high-pressure brewing, such as those required for espresso, and often risk damaging the filter during deformation, which can compromise the retention of coffee powder, and are not compatible with different machine operating logics.
Innovation Solution
A capsule design featuring a semi-rigid main body with a cover element and lengthening means that allow the bottom wall to move away from the cover element under increased pressure, enabling deformation without filter damage, and compatible with various brewing methods and machine types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the capsule wall is deformed to achieve delayed opening under pressure, then the brewing pressure can be maintained, but the filter may move or be damaged compromising coffee retention
Solution Approach 1:
The capsule wall is divided into a rigid upper portion (containing the filter) and a flexible lower portion. This segmentation allows the lower portion to deform under pressure for delayed opening while the upper portion remains rigid to maintain filter position and integrity, resolving the contradiction between pressure maintenance and filter retention.
Solution Approach 2:
Different portions of the capsule wall have different mechanical properties: the upper portion near the filter is rigid to protect filter stability, while the lower portion is flexible to enable pressure-induced deformation and delayed opening. This local differentiation resolves the contradiction by assigning different functional qualities to different regions.
2Reliability
If the capsule is designed for specific machine operating logics, then the brewing process can be optimized, but the capsule cannot be used in machines with different operating logics
Solution Approach 1:
The capsule design incorporates both rigid and flexible wall portions that can adapt to different machine operating logics. The flexible lower portion can deform in response to various pressure applications (whether from fixed spikes or bursting mechanisms), while the rigid upper portion maintains filter integrity. This multi-functional design allows the same capsule to work reliably across different machine types.
Solution Approach 2:
The capsule transitions from a static structure to a dynamic one where the lower wall portion can change shape under pressure. This dynamic response allows the capsule to adapt its deformation pattern based on the specific machine's operating logic, whether through controlled tearing or bursting, while maintaining consistent brewing performance across different machines.
3Strength
If the capsule uses a rigid structure, then the filter remains stable, but high-pressure brewing and delayed opening cannot be achieved
Solution Approach 1:
The capsule is segmented into rigid and flexible portions, with the rigid upper section providing filter stability and the flexible lower section enabling high-pressure brewing and delayed opening through deformation. This segmentation resolves the contradiction by localizing structural properties to match functional requirements.
Solution Approach 2:
The capsule exhibits local quality differentiation where the upper wall portion is rigid to stabilize the filter, while the lower wall portion is flexible to enable pressure-induced deformation for delayed opening. This localized structural variation allows simultaneous achievement of filter stability and brewing adaptability.
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 capsule achieves delayed opening without filter compromise, allowing use in machines with different brewing logics and maintaining coffee quality, while being cost-effective and easy to produce.
Implementation Method 1
following an increase in the capsule internal pressure to at least a predetermined value sufficient to cause the movement of the lower portion of the lateral wall and the bottom wall away from the cover element
Implementation Method 2
The lower portion of the lateral wall and/or the bottom wall are deformable, following an increase in the capsule internal pressure
Data Source
AI summary
A capsule for making a drink comprises a cup-shaped main body (6) forming a housing chamber (7) containing a powdered or liquid substance (2). The main body (6) comprises a bottom wall (8) and a lateral wall (9) which has a lower portion (10) connected to the bottom wall (8) and an upper portion (11) delimiting an opening which is closed by a cover element (17). The capsule also comprises lengthening means (18) which, following an increase in the capsule (1) internal pressure, allow a movement away from the cover element (17) by the lower portion (10) of the lateral wall (9) and the bottom wall (8) connected to it. Also claimed is a method which comprises feeding water and/or steam into the capsule (1) to increase the capsule (1) internal pressure and so cause the movement of the lower portion (10) of the lateral wall (9) and the bottom wall (8) away from the cover element (17) until the bottom wall (8) is torn against external piercing means, thus allowing the drink to be supplied through the bottom wall (8).