Coffee Tablet Compression with Differential Heating
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Solution Overview
Problem
Existing methods for producing coffee tablets often result in incorrect organoleptic profiles and integrity issues such as dusting, breakage, and lateral cracks, due to inadequate compaction and heating processes.
Innovation Solution
A method involving the production of coffee powder tablets with a self-supporting structure, where the coffee powder is moistened to a predetermined moisture content, compressed within a moulding cavity with differential heating of its regions, and extracted without a functional outer casing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If coffee powder is compressed with high compressive force to form tablets, then tablet density and structural integrity are improved, but lateral cracks and breakage occur
Solution Approach 1:
The patent applies parameter changes by controlling moisture content (3-11% by weight) and applying differential heating during compression. The heating temperature is maintained between 40-95°C, with peripheral regions heated to 70-95°C and central regions to 40-60°C. These parameter changes modify the physical state of coffee particles during compression, enabling tablet formation at lower compressive forces (5-50 MPa) while preventing lateral cracks and breakage.
Solution Approach 2:
The patent implements local quality through differential heating of different tablet regions during compression. The peripheral surface receives higher temperatures (70-95°C) compared to the central region (40-60°C). This localized temperature variation creates different material properties in different regions, allowing the periphery to set faster and prevent crack propagation while the center consolidates properly.
2Productivity
If uniform heating is applied during tablet compression, then processing speed is improved, but lateral cracks form due to excessive heat in certain regions
Solution Approach 1:
The patent implements local quality through differential heating of different tablet regions during compression. The peripheral surface receives higher temperatures (70-95°C) compared to the central region (40-60°C). This localized temperature variation creates different material properties in different regions, allowing the periphery to set faster and prevent crack propagation while the center consolidates properly.
Solution Approach 2:
The patent applies parameter changes by controlling heating temperature and distribution during compression. The heating temperature is maintained between 40-95°C, with peripheral regions heated to 70-95°C and central regions to 40-60°C. These parameter changes modify the physical state of coffee particles during compression, enabling tablet formation while preventing lateral cracks.
3Manufacturing precision
If coffee powder moisture content is increased to improve tablet formation, then compaction quality is improved, but organoleptic profile deteriorates due to excessive moisture
Solution Approach 1:
The patent applies parameter changes by controlling moisture content within the optimal range of 3-11% by weight. This moisture level is sufficient to enable proper particle bonding during compression but low enough to prevent organoleptic degradation. Combined with controlled heating at 40-95°C, this moisture parameter optimization achieves both good tablet formation and preserved coffee quality.
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 method effectively reduces the formation of lateral cracks in the tablets, improves their integrity, and allows for controlled heating to maintain the organoleptic profile of the coffee, enhancing productivity and quality.
Implementation Method 1
the coffee powder is moistened to a predetermined moisture content
Implementation Method 2
compressed within a moulding cavity
Implementation Method 3
allows for controlled heating to maintain the organoleptic profile of the coffee
Data Source
AI summary
A method for the production of coffee tablets comprises the steps of: i) providing a uniformly moistened mass of roasted and ground coffee, having a moisture content by weight of between 3 and 11%; ii) feeding the moistened mass to a dosing device; iii) placing a dose of moistened coffee into a cavity of a moulding equipment, the cavity having a bottom surface (35a), a head surface (32a) and a peripheral surface, said the bottom surface (35a), said head surface (32a) and at least a portion (22a) of said peripheral surface being configured to delimit a compression space (CS) of the moistened coffee dose; iv) compressing the dose of moistened coffee (DGC) into the cavity (22) to form a coffee tablet (1); v) removing the coffee tablet (1) from the cavity (22). Step iv) comprises compressing the dose of moistened coffee (DGC) while said portion of the peripheral surface (22a) is heated at a different temperature, preferably lower, than a temperature at which at least one of the bottom surface (35a) and the head surface (32a) is heated.