Sealed Coffee Capsule Step Geometry for Faster Extraction Flow
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Solution Overview
Problem
Existing sealed capsules for beverage preparation, such as espresso coffee, face inefficiencies in fluid flow due to the location and minimal effect of the annular step formation, which hinders the deformation of the bottom wall and subsequent extraction process, especially when the granular material is pre-compressed.
Innovation Solution
A sealed capsule design with an annular step formation closer to the bottom wall, providing a significant local reduction in cross-section of at least 25%, facilitating fluid speed increase and bottom wall deformation towards a perforation device, even with pre-compressed granular material resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the annular step formation is placed closer to the cover with minimal radial extension, then the capsule structure is simpler, but the fluid flow speed is insufficient and bottom wall deformation is hindered
Solution Approach 1:
The annular step formation is repositioned closer to the bottom wall with increased radial extension to create a significant local reduction in cross-section (at least 25%). This localized geometric modification concentrates the fluid flow acceleration effect precisely where needed - at the bottom wall region - without requiring complex overall structural changes to the capsule
Solution Approach 2:
The invention modifies the radial dimension of the step formation by increasing its extension, thereby creating a more pronounced cross-sectional reduction. This dimensional change transforms the mild flow guidance effect into a strong flow acceleration mechanism, enabling sufficient fluid speed increase to deform the bottom wall effectively
2Manufacturing precision
If the granular material is pre-compressed to form a compact panel, then the beverage extraction quality is improved, but the fluid flow resistance increases causing head loss
Solution Approach 1:
The invention changes the geometric parameters of the chamber by introducing a pronounced annular step formation that creates a local cross-section reduction of at least 25%. This parameter change accelerates fluid flow velocity in the bottom wall region, compensating for the energy loss due to head pressure required for effective bottom wall deformation
Solution Approach 2:
The invention converts the harmful effect of pre-compression (increased flow resistance and head loss) into a beneficial outcome by strategically positioning the step formation to accelerate fluid flow precisely where needed. The accelerated flow compensates for the resistance, enabling the compacted material to be effectively extracted while maintaining sufficient pressure for bottom wall deformation
3Ease of operation
If the bottom wall is made flexible to enable deformation, then the extraction process is improved, but the capsule requires more complex material properties
Solution Approach 1:
The annular step formation is pre-configured in the capsule structure to create the necessary flow acceleration conditions before the extraction process begins. This preliminary geometric arrangement ensures that when fluid is introduced, the flow velocity is already optimized to facilitate bottom wall deformation without requiring additional active control mechanisms
Solution Approach 2:
The flexible bottom wall property is concentrated and utilized specifically in the region affected by the step formation-induced flow acceleration. The localized flow velocity increase acts precisely where the bottom wall needs to deform, making the extraction process more efficient while maintaining relatively simple overall material requirements
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
This design enhances beverage extraction efficiency by increasing fluid speed and facilitating bottom wall deformation, overcoming the resistance from pre-compressed material and reducing the loss of head during the extraction process.
Implementation Method 1
the granular material is preliminarily compressed within said chamber in a direction perpendicular to the plane containing said flange, such as to form a compact panel of said material
Implementation Method 2
in said chamber a vacuum is then provided to a degree such that the cover substantially adheres to the upper surface of said panel
Implementation Method 3
the bottom wall of the cup-shaped body is able to be deformed under the effect of the fluid introduced into the capsule, being displaced away from the cover
Data Source
Figure 1
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AI summary
The capsule (1) comprises a cup-shaped body (2) with a protruding top flange (2a), a lateral wall (2b), a flexible bottom wall (2c), and a flexible cover (3) which is welded to the flange (2a) so as to define a sealed chamber (4) containing a granular material (5), in particular ground roasted coffee, for the preparation of the beverage. The granular material (5) is preliminarily compressed within the chamber (4) so as to form a compact panel, and in the chamber (4) a vacuum is then provided to a degree such that the cover (3) moves towards and tends to adhere to the upper surface of this panel. Between the flange (2a) and the bottom wall (2c) the lateral wall (2b) of the cup-shaped body (2) has an annular step formation (2f) which provides a local reduction in the cross- section of the chamber (4) towards the bottom wall (2c). This step-like formation (2f) is provided closer to the bottom wall (2c) of the cup-shaped body (2) than to the flange (2a) and provides a local reduction in the cross-section of the chamber (4) of at least about 25%. The bottom wall (2c) of the cup-shaped body (2) is able to be deformed under the effect of the fluid introduced into the capsule (1), being displaced away from the cover (3).