Cold Brew Filtration Layout for Clear, Sediment-Free Extraction
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Solution Overview
Problem
Existing cold brewing devices face issues such as filter clogging, breakage, air pockets, inconsistent extraction, and sediment contamination due to the use of felt-type filters and filter bags, leading to weak and inconsistent coffee products.
Innovation Solution
A coffee brewing device featuring a container with a plate and envelope-style filter system that allows for dual filtration, with a coalescing chamber to separate sediments, eliminating the need for felt-type filters and filter bags, ensuring complete saturation of coffee grounds and reducing sediment in the final extract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If felt-type filters are used for draining coffee, then filtration is provided, but the filters tend to blind (clog) during draining
Solution Approach 1:
The filtration process is divided into two separate stages: first through a mesh filter and then through a coffee bed filter. This segmentation prevents clogging by distributing the filtration load across multiple components rather than relying on a single felt-type filter that becomes blocked.
Solution Approach 2:
The harmful clogging function is extracted from the felt-type filter by replacing it with a mesh filter that provides structural support without the blinding problem, while the actual filtration is performed by the coffee bed itself which naturally filters without clogging.
2Reliability
If filter bags are used to hold coffee grounds, then containment is provided, but they are prone to breakage and spillage
Solution Approach 1:
The problematic filter bag is completely removed from the system. Instead, coffee grounds are contained within a mesh filter structure that is integrated into the brewing chamber, eliminating the breakage and spillage issues associated with fabric filter bags.
Solution Approach 2:
The containment system uses a composite structure combining a rigid mesh filter framework with the coffee bed itself, creating a more durable and reliable containment system compared to single-material filter bags.
3Reliability
If filter bags are used, then coffee containment is provided, but they produce air pockets in the coffee grounds leading to weak and inconsistent extract
Solution Approach 1:
The filter bag that creates air pockets is removed entirely. The open mesh structure allows water to freely contact and saturate the coffee grounds uniformly, eliminating air pockets and ensuring consistent extraction throughout the coffee bed.
Solution Approach 2:
The mesh filter provides a porous structure with uniform openings that allow complete water penetration through the coffee bed, ensuring even saturation and consistent extraction without the air trapping problems of sealed filter bags.
4Device complexity
If a single filter stage is used, then device simplicity is maintained, but fine sediment blends into the final extract
Solution Approach 1:
The filtration system is segmented into two distinct stages: a mesh filter for structural support and initial filtration, followed by a coffee bed filter for fine sediment removal. This two-stage approach achieves superior clarification without requiring complex mechanical filtration systems.
5Reliability
If felt-type filters are used, then filtration is provided, but they do not completely saturate coffee resulting in inconsistent coffee
Solution Approach 1:
The felt-type filter that prevents complete saturation is removed. The open mesh structure allows water to fully penetrate and saturate the coffee grounds uniformly throughout the bed, ensuring consistent extraction and eliminating the partial saturation problems of felt filters.
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 device produces a clear, polished, and consistent cold-brewed coffee concentrate with reduced sediment, improving upon existing systems by preventing clogging and ensuring complete saturation of coffee grounds, resulting in a higher Brix value and improved quality.
Implementation Method 1
the filter surrounding the plate when the plate is inserted in the opening so that liquid passing through the plate is filtered twice, once by the top portion of the filter and once by the bottom portion of the filter
Implementation Method 2
an outlet spigot positioned on an exterior portion of the side of the container below the position of the plate and in a position above the base of the container so that sediments can accumulate during use of the coffee brewing device and are not dispensed from the spigot
Data Source
AI summary
A coffee brewing device, such as a cold coffee brewing device and related methods are disclosed. The device includes a container, a supported horizontal plate that holds filter paper in place, and a spigot below the horizontal plate. Coffee grounds are placed on the filter, then water is added to the container such that minimal disturbance of the coffee ground bed occurs. When the spigot is opened, liquid is removed in a north/south (up/down) direction through the coffee ground bed. The coffee ground bed serves as a first filter, the filter serves as a second filter, and the chamber below the horizontal plate serves as a coalescing chamber where sediment drops out thus serving as a third filter. The resulting liquid dispensed from the spigot is amber in color and clear.