Filter paper insert and filter basket with filter paper insert
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Solution Overview
Problem
Existing filter paper inserts for brewed beverages result in uneven extraction of coffee grounds due to central liquid flow dominance, leading to excessive extraction in the center region and less extraction in edge regions.
Innovation Solution
A filter paper insert with a bottom seam that deviates from a straight line, featuring at least two lower outlet areas and a higher-positioned saddle-type section, ensuring a more uniform liquid flow through the coffee grounds by creating different height areas and directional flow paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straight bottom seam is used to connect the two side walls, then the filter paper insert structure is simple and easy to manufacture, but the liquid flow becomes unpredictable and extraction is uneven with excessive extraction in the center region
Solution Approach 1:
The bottom seam is designed with a curved or non-linear shape instead of a straight line, creating a saddle-type section that redirects liquid flow from the center toward the edge regions. This curvature modifies the flow path to achieve more uniform extraction across the filter surface.
Solution Approach 2:
The bottom seam design introduces a dimensional variation by creating different height areas along the seam, forming a three-dimensional saddle-type structure. This additional height dimension guides liquid flow distribution to improve extraction uniformity.
2Manufacturing precision
If a non-linear bottom seam is used to improve extraction uniformity, then liquid flow becomes more uniform through non-central regions, but the structure becomes more complex
Solution Approach 1:
The bottom seam employs a curved saddle-type design that achieves uniform extraction by redirecting flow from center to edges, accepting increased structural complexity as a necessary trade-off for improved extraction uniformity.
3Device complexity
If liquid flows primarily through the center region, then the filter paper insert structure is simple, but the extraction is uneven with excessive extraction in the center and less extraction in edge regions
Solution Approach 1:
The curved bottom seam creates a saddle-type structure that redirects liquid flow from the center toward the edge regions, ensuring more uniform extraction across the entire filter surface by modifying the natural flow path.
Solution Approach 2:
The bottom seam design creates different height areas at different locations, with the saddle-type section specifically positioned to redirect flow to regions that need more extraction, achieving localized flow optimization.
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 non-linear bottom seam design enhances uniform extraction by increasing liquid flow through non-central regions, improving extraction efficiency and consistency across the filter paper insert.
Implementation Method 1
the liquid does not primarily flow centrally through the filter paper insert but can increasingly also flow through the non-central areas
Data Source
AI summary
A filter paper insert for producing a brewed beverage includes a first side wall and a second side wall which are respectively connected along opposite sides by one of a seam and a folding edge, and are connected via a bottom seam. The insert has an opening for filling the filter paper insert opposite the bottom seam. The bottom seam has a shape that deviates from a straight line.