Nonwoven Filter Capsule for Clogging-Resistant Beverage Extraction
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Solution Overview
Problem
Existing portion capsules for beverage production face challenges such as high production costs, clogging issues, and increased capsule volume due to complex sieve arrangements, which affect the efficiency and cost-effectiveness of the brewing process.
Innovation Solution
A portion capsule utilizing a simple and inexpensive nonwoven filter fabric as the filter screen, eliminating the need for complex plastic injection molding or deep-drawing processes, and providing a larger liquid entry surface for improved mixing and drainage, while being resistant to clogging under various pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sieve with small openings is used to retain coffee particles, then coffee particle retention is improved, but sieve clogging occurs at high pressures
Solution Approach 1:
The patent employs a porous support structure with through-flow channels that allow liquid to pass through while retaining coffee particles. The porous design enables high-pressure flow without clogging by providing multiple flow paths, while the support structure geometry ensures adequate retention of coffee particles during brewing.
2Manufacturing precision
If injection molding or deep-drawing processes are used to manufacture sieves, then manufacturing precision is improved, but production costs increase
Solution Approach 1:
The patent changes the manufacturing approach from precision injection molding or deep-drawing to a process that forms the support structure with through-flow channels. This parameter change in manufacturing method reduces production costs while maintaining adequate precision for the brewing application through the designed channel geometry.
3Strength
If additional support elements are added beneath sieves to withstand high pressure, then structural strength is improved, but material usage and manufacturing costs increase
Solution Approach 1:
The patent merges the support function with the sieve structure itself by designing the support structure to include integrated through-flow channels. This combination eliminates the need for separate support elements beneath the sieve, reducing material usage while maintaining the strength required to withstand high brewing pressures.
Solution Approach 2:
The support structure serves multiple functions simultaneously: it provides mechanical strength to withstand high pressure, creates flow channels for liquid passage, and supports the sieve function. This multi-functionality reduces the need for additional components and material usage.
4Stress or pressure
If a complex sieve arrangement with support elements is used, then brewing pressure resistance is improved, but capsule volume increases
Solution Approach 1:
The patent combines the support structure and flow channel function into a single integrated component rather than using separate support elements. This merging reduces the overall volume occupied by the brewing assembly while maintaining adequate pressure resistance through the designed channel geometry.
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 nonwoven filter fabric reduces production costs, minimizes clogging risks, and ensures efficient extraction and drainage, maintaining the formation of 'crema' in beverages like espresso, with a design that allows for reliable transverse flow and efficient beverage production.
Implementation Method 1
a filter element (7) made of nonwoven fabric is arranged between the beverage substance (101) and the capsule base (3)
Implementation Method 2
brewing liquid, preferably hot water, is pumped into the single-serve capsule under pressure. The brewing liquid flows through the beverage substrate and extracts and/or dissolves the substances required for beverage production from it
Data Source
Figure 1~3
Figure 4a~6b
Figure 7a~9
AI summary
A portion capsule (1) for the production of a beverage is proposed, comprising a capsule body (2) with a capsule bottom (3) and a filling side (4), wherein a cavity (100) for receiving a powdered or liquid beverage substrate (101) is formed between the capsule bottom (2) and the filling side (4), wherein a filter element (7) is arranged between the beverage substrate (101) and the capsule bottom (3), and wherein the filter element (7) comprises a nonwoven fabric which is arranged in the area of the capsule bottom.