Form-Retaining Coffee Pad Structure to Prevent Fluid Bypass
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Solution Overview
Problem
Existing coffee-maker pads are prone to deformation, leading to increased risk of fluid bypass and uneven distribution of beverage preparation products, resulting in diluted beverages and reduced ingredient incorporation during brewing.
Innovation Solution
The use of form-retaining sheets made from a combination of meltable polymers and non-meltable fibers such as abaca, flax, and hemp, which maintain shape and structure during brewing, reducing bypass and ensuring uniform product distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If flexible and supple filtering paper sheets are used in the pad, then the pad is easy to manufacture and handle, but the pad deforms during storage and placement, increasing the risk of fluid bypass
Solution Approach 1:
The sheet is constructed as a composite material combining cellulose fibers (providing flexibility and porosity) with thermoplastic polymer particles (providing form retention). This composite structure allows the sheet to maintain its shape during storage and handling while remaining flexible enough for manufacturing and proper placement in the coffee maker holder, thereby preventing fluid bypass.
Solution Approach 2:
The physical and chemical parameters of the sheet material are modified by incorporating thermoplastic polymer particles that undergo phase changes at brewing temperatures. These parameter changes enable the sheet to transition from a flexible state during manufacturing to a rigid, form-retaining state during brewing, resolving the contradiction between ease of manufacture and shape stability.
2Manufacturing precision
If uniform distribution of beverage preparation product is achieved, then beverage quality is consistent, but pad structure must be rigid which complicates manufacturing
Solution Approach 1:
The composite sheet structure with thermoplastic particles creates a rigid yet manufacturable form that maintains uniform thickness and product distribution. The thermoplastic component provides structural integrity without requiring complex manufacturing processes, as the particles are simply incorporated into the cellulose matrix during standard sheet formation.
Solution Approach 2:
The sheet exhibits local quality variations where the thermoplastic polymer particles are distributed throughout the cellulose matrix, providing localized rigidity and form retention. This allows the pad to maintain uniform product distribution while remaining simple to manufacture using conventional sheet-making processes.
3Reliability
If the pad maintains its original shape during brewing, then fluid bypass is prevented, but the sheet material becomes more complex
Solution Approach 1:
The sheet uses a composite of cellulose fibers and thermoplastic polymer particles, where the relatively simple cellulose base provides the filtering function and the thermoplastic particles provide the form-retaining property. This composite approach prevents fluid bypass by maintaining pad shape during brewing while keeping the overall material system simple and based on natural, well-understood components.
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 design ensures consistent beverage quality by minimizing bypass and maintaining structural integrity during fluid flow, resulting in well-defined beverage properties and an anti-drip effect after use.
Implementation Method 1
comprising a mixture of cellulose fibers and thermoplastic polymer particles, in a weight ratio of 95:5 to 50:50
Implementation Method 2
the thermoplastic polymer particles melt under brewing conditions to bond the cellulose fibers together
Implementation Method 3
the thermoplastic polymer particles melt under brewing conditions to bond the cellulose fibers together
Data Source
Figure 1~3
Figure 4
Figure 5.1~5.3
AI summary
The invention relates to a pad for use in a coffee-maker, provided with an envelope with an inner space which is filled with a beverage preparation product, wherein the envelope is formed by a first disc-shaped sheet and a second disc-shaped sheet, wherein the interconnected parts of the first sheet and the second sheet form a sealing seam and wherein the first sheet and the second sheet each form a filter which can pass a fluid and which forms a barrier to the beverage preparation product, wherein, in use, with the coffee-maker a fluid such as water is supplied, under pressure, via the first sheet to the pad so that the fluid is pressed through the pad for obtaining the beverage which thereupon leaves the pad, wherein each sheet comprises at least one layer, and wherein at least one of the first sheet and the second sheet is of form-retaining design, made of at least one base compound comprising meltable polymers and preferably fibers and/or filaments of the same, and at least one enforcement compound comprising at least meltable polymers of the group of abaca, banana plant, flax, hemp, lyocell, tencel, kenaf, nettles, ramie, bamboo, bowstring, indian hemp, jute, cotton, coir, sisal, agave and preferably fibers and/or filaments.