Cold Coffee Brewer Filtration Layout for Clear Sediment-Free Extract
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Solution Overview
Problem
Existing cold brewing systems 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 suboptimal coffee quality.
Innovation Solution
A coffee brewing device with a container and multiple filter stages, including a paper filter and a coalescing chamber, which allows coffee grounds to act as a filter bed, reducing sediment and ensuring complete saturation, thereby producing a clear and polished coffee extract.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If felt-type filters are used in cold brewing devices, then filtration is provided, but the filters tend to blind (clog) during draining
Solution Approach 1:
The filtration process is divided into multiple stages using different filter types. A mesh filter provides initial filtration while allowing good drainage, followed by a paper filter for final polishing. This segmentation prevents any single filter from becoming overloaded and clogged, maintaining both reliability and productivity.
Solution Approach 2:
The invention uses mesh filters with specific pore sizes that balance filtration effectiveness with drainage speed. The porous structure allows water to pass through efficiently while trapping coffee particles, preventing the blinding issue associated with felt-type filters.
2Reliability
If filter bags are used, then coffee grounds are contained, but the filter bags are prone to breakage and spillage
Solution Approach 1:
The invention extracts the coffee grounds from the filtration path by using a shower head design that distributes water over the grounds, allowing them to steep and then drain through filters. This eliminates the need for filter bags that are prone to breakage, as the grounds are contained and filtered in a more robust manner.
Solution Approach 2:
The invention uses disposable paper filters that are inexpensive and replaceable. These filters provide reliable containment and filtration without the strength and durability issues of reusable filter bags, offering a cost-effective solution that maintains integrity throughout the brewing process.
3Reliability
If filter bags are used, then coffee grounds are contained, but air pockets form in the coffee grounds leading to weak and inconsistent extract
Solution Approach 1:
The shower head design creates dynamic water distribution that penetrates the coffee grounds uniformly, preventing air pocket formation. The moving water flow ensures complete saturation of the coffee bed, leading to consistent and reliable extraction throughout the brewing process.
Solution Approach 2:
The mesh filter acts as an intermediary between the coffee grounds and the collection container, allowing water to pass through while maintaining even contact with the grounds. This intermediary structure prevents air pockets and ensures uniform extraction, improving manufacturing precision.
4Device complexity
If a single filter stage is used, then device complexity is reduced, but fine sediment blends into the final extract
Solution Approach 1:
The filtration system is segmented into multiple stages: a mesh filter for initial coarse filtration and a paper filter for fine filtration. This segmentation effectively removes sediment while maintaining reasonable device complexity, as each filter handles a specific size range of particles.
Solution Approach 2:
The invention uses porous materials with different pore sizes for sequential filtration. The mesh filter captures larger particles while allowing water through, and the paper filter with smaller pores captures fine sediment, achieving high removal efficiency without excessive complexity.
5Device complexity
If a single filter stage is used, then device complexity is reduced, but complete saturation of coffee is not achieved
Solution Approach 1:
The shower head design provides dynamic water distribution that ensures complete and uniform saturation of the coffee grounds. This dynamic approach, combined with the multi-stage filtration structure, achieves precise coffee saturation without significantly increasing device complexity.
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 achieves a consistent, sediment-free, and highly polished coffee extract with improved filtration, avoiding filter clogging and breakage, and producing a concentrated liquid with a higher Brix value compared to current commercial devices.
Implementation Method 1
A paper filter is laid upon the plate so that it abuts the first horizontal plate... The spigot can optionally include a mesh filter
Implementation Method 2
allows coffee grounds to act as a filter bed, reducing sediment
Implementation Method 3
the first horizontal plate and the base of the container form a space, which may be described as a coalescing chamber, which functions to decant liquid away from the sediment that accumulates during brewing and draining
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.