Form-Retaining Coffee Pad Design to Prevent Fluid Bypass and Dilution
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Solution Overview
Problem
Conventional coffee-maker pads are prone to deformation, leading to increased risk of fluid bypass and uneven beverage preparation, resulting in diluted and inconsistent coffee quality due to non-uniform distribution of the beverage preparation product.
Innovation Solution
A coffee-maker pad with a form-retaining second sheet made of a nonwoven material, comprising at least 50-100% plastic fibers or filaments, which maintains its shape during and after fluid flow, preventing bypass and ensuring uniform extraction of the beverage preparation product.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the second sheet is made of flexible filtering paper, then the pad is easy to manufacture and insert, but the pad deforms during use leading to fluid bypass and inconsistent beverage quality
Solution Approach 1:
The second sheet is made from a composite material comprising cellulose fibers and plastic fibers, where the plastic fibers provide structural rigidity and form-retaining properties while the cellulose fibers maintain filtering capability. This composite structure resolves the contradiction by combining the flexibility needed for easy insertion with the rigidity required to prevent deformation and fluid bypass during use.
2Manufacturing precision
If the beverage preparation product is distributed uniformly, then consistent beverage quality is achieved, but deformation causes non-uniform distribution and diluted beverage
Solution Approach 1:
Instead of trying to make the flexible sheet rigid through complex structural designs, the invention inverts the approach by incorporating rigid plastic fibers directly into the filtering sheet material itself. This gives the sheet inherent form-retaining properties that maintain uniform product distribution and prevent deformation, thereby ensuring consistent beverage quality without compromising filtering performance.
3Reliability
If the second sheet retains its shape under fluid pressure, then fluid bypass is prevented, but the material must withstand high pressure which may affect filtering performance
Solution Approach 1:
The invention changes the material parameters of the second sheet by incorporating plastic fibers with specific structural characteristics that provide both pressure resistance and filtering capability. The plastic fibers create a stable matrix structure that maintains sheet integrity under fluid pressure to prevent bypass, while the interconnected fiber network preserves adequate porosity for effective filtering performance.
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 form-retaining second sheet ensures consistent beverage quality by minimizing fluid bypass and maintaining uniform distribution of the beverage preparation product, resulting in well-defined beverage properties and an anti-drip effect, making it easier to remove the pad after use.
Implementation Method 1
the second sheet is of form-retaining design... the second sheet is made of a nonwoven material, which is made of a plastic for at least 50 percent by weight... consisting of plastic fibers and/or plastic filaments
Implementation Method 2
the first sheet and the second sheet each form a filter which can pass the fluid and which forms a barrier to the beverage preparation product
Data Source
AI summary
A pad, for use in a coffee-maker for preparing 1 or 2 cups of beverage, includes an envelope with an inner space which is filled with a beverage preparation product for preparing the beverage. The beverage preparation product comprises a product to be extracted with a fluid (and/or a product soluble in a fluid). The envelope is formed by a first disc-shaped sheet and a second disc-shaped sheet which are interconnected adjacent their longitudinal edges. The interconnected parts of the first sheet and the second sheet form a sealing seam wherein the first sheet and the second sheet each form a filter which can pass a fluid and which forms a barrier to the product to be extracted. The second sheet is of form-retaining design. In use with the coffee-maker, a fluid such as water is supplied under pressure to the pad so that the fluid is pressed through the pad for obtaining a beverage which thereupon leaves the pad.