Portion Capsule Pre-Compression for Even Espresso Extraction
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Solution Overview
Problem
Existing coffee brewing systems fail to produce high-quality coffee due to uneven extraction material distribution and flow resistance issues, particularly in portion capsules with curved lids that are not completely filled, leading to less flow resistance at the top and incomplete extraction.
Innovation Solution
The system compresses the portion capsule before brewing, using an extraction mandrel with a pyramidal or conical shape and ribs to compact the coffee grounds and ensure even extraction, while separate control of brewing liquid injection and pressure allows for optimized brewing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the portion capsule is not compressed before brewing, then the device complexity is reduced, but the extraction quality deteriorates due to uneven water flow distribution
Solution Approach 1:
The capsule is compressed in advance before the brewing process begins. The compression device presses the capsule against the extraction mandrel, pre-compacting the coffee grounds and creating uniform flow channels before water is introduced. This preliminary action ensures even water distribution during brewing without requiring complex real-time control mechanisms.
2Strength
If the capsule wall is made rigid to maintain shape, then the structural strength is improved, but the compaction effectiveness deteriorates because the wall cannot be pressed inward
Solution Approach 1:
The capsule wall is designed with differential properties: the bottom wall is made flexible to allow inward compression during the tamping process, while the lateral walls maintain sufficient rigidity to hold the capsule shape and contain the coffee grounds. This local differentiation enables both effective compaction and structural integrity.
3Productivity
If brewing liquid is injected at high pressure to improve extraction speed, then the productivity is improved, but the extraction quality deteriorates due to uneven flow distribution in uncompressed capsules
Solution Approach 1:
The capsule is compressed before high-pressure brewing liquid injection. This pre-compaction creates uniform density and flow resistance throughout the coffee grounds, ensuring that high-pressure water distributes evenly across all areas of the capsule rather than finding paths of least resistance. The result is both fast extraction and uniform quality.
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 approach results in improved aroma extraction and crema quality, ensuring all coffee grounds are evenly saturated and contributing to a better-tasting espresso by compensating for gravity-induced irregularities and maintaining flow resistance throughout the capsule.
Implementation Method 1
the system according to the invention comprises pressure means for pressing in the wall of the portion capsule facing the extraction device when the injection device and the extraction device are moved towards one another in order to fix the capsule
Implementation Method 2
a second compression of the portion capsule can also take place during the brewing process if the portion capsule is subjected to pressurized brewing liquid on the injection side
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(c)
Figure 3(a)~3(b)
AI summary
The invention relates to a system for preparing a brewed product with a portion capsule containing an extraction material and an extraction device for preparing the brewed product from the extraction material contained in the portion capsule, the extraction device having an injection device for introducing a brewing liquid into the portion capsule and an extraction device for discharging an extraction product the portion capsule comprises, wherein the injection device and the extraction device between them define a receiving space for the portion capsule and for inserting the capsule into the receiving space can be moved relatively apart and for fixing the capsule can be moved relative to one another. The extraction device has a pressure means by which a wall of the portion capsule inserted in the receiving space facing the extraction device can be pressed in the direction of the interior of the capsule for compacting the extraction material contained in the portion capsule before the injection device introduces brewing liquid into the portion capsule.