Coffee Capsule Centrifugation With Pre-Compaction for Short Espresso
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Solution Overview
Problem
Traditional coffee extraction methods, such as drip brewing, fail to deliver short coffee beverages with adequate aroma and flavor intensity, body, and crema, while centrifugation methods suffer from non-homogeneous liquid-coffee interaction leading to suboptimal extraction quality, particularly for ristretto or espresso-type coffees.
Innovation Solution
A method involving a dry coffee compaction step by centrifugation before liquid addition, followed by controlled rotational speed and liquid flow rate during extraction to ensure uniform wetting and optimal coffee extraction, using a capsule system with adjustable rotational speed and back-pressure to enhance aroma and flavor intensity and crema formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centrifugation is used to prepare short coffee beverages, then the preparation time is reduced and the method is simpler, but the aroma and flavor intensity are insufficient compared to traditional high-pressure extraction
Solution Approach 1:
The patent changes the physical parameters of centrifugation by optimizing rotational speed (3000-8000 rpm), liquid flow rate (0.5-5 ml/s), and coffee bed compaction density to achieve extraction quality comparable to traditional high-pressure methods while maintaining the speed advantage of centrifugation
Solution Approach 2:
The patent applies preliminary compaction to the coffee powder before liquid addition, creating a dense, uniform coffee bed that prevents channeling and ensures homogeneous extraction. This preliminary preparation step enables centrifugation to achieve better extraction efficiency without increasing preparation time
2Quantity of substance
If traditional high-pressure extraction is used, then aroma and flavor intensity are high, but the device complexity and operating pressure requirements increase
Solution Approach 1:
The patent replaces the traditional high-pressure piston mechanism with a centrifugal extraction system. By using rotational motion to generate centrifugal force, the system achieves effective extraction without requiring complex high-pressure pumps, valves, and safety mechanisms, thereby simplifying device structure while maintaining extraction quality
3Ease of operation
If liquid is added directly to ground coffee in centrifugation, then the process is simple, but non-homogeneous liquid-coffee interaction occurs leading to poor extraction quality
Solution Approach 1:
The patent applies preliminary compaction to the coffee powder before liquid addition, creating a dense, uniform coffee bed that prevents channeling and ensures homogeneous extraction. This preliminary preparation step enables centrifugation to achieve better extraction efficiency without increasing preparation time
Solution Approach 2:
The patent optimizes the liquid flow rate parameter (0.5-5 ml/s) to match the compaction density and centrifugal force, ensuring that liquid distributes uniformly through the coffee bed without channeling or pooling, thereby achieving homogeneous extraction while maintaining simple operation
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 method significantly improves the aroma and flavor intensity of short coffee beverages, matching traditional extraction methods, and enhances crema quality by ensuring uniform coffee extraction and controlled liquid flow, suitable for various coffee volumes.
Implementation Method 1
rotating the receptacle at elevated speed to ensure interaction of liquid with powder while creating a gradient of pressure of liquid in the receptacle; such pressure increasing gradually from the centre towards the periphery of the receptacle
Implementation Method 2
the receptacle is rotated in such a manner to force dry coffee powder to compact on the peripheral wall of the receptacle and to leave a passage for liquid to be fed in the central region of the receptacle
Data Source
Figure 1a~1b
Figure 1c
Figure 2~3
AI summary
Method for preparing a short coffee extract from a capsule containing coffee powder, comprising: providing a capsule containing contains between 5.0 and 8.5 gram of ground coffee powder, injecting a liquid in the capsule; said liquid interacting with the coffee powder and centrifuging the capsule in a beverage producing device to force, by effect of the centrifugal forces, the liquid coffee extract out of the capsule; such coffee extract being then collected, wherein the extraction of the liquid coffee extract is obtained by rotating the capsule within a speed range comprised within a range of 2500 to 7500 rpm.