Granite Roller Mill for Coffee Taste-Neutral Dry Grinding
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Solution Overview
Problem
Conventional roller mills for grinding coffee are inefficient and require frequent maintenance due to the adverse effect on coffee taste and the need for regular renewal of grinding rollers, especially when dry grinding, which affects the quality and efficiency of the process.
Innovation Solution
A roller mill with granite grinding rollers and a specific peripheral velocity ratio, which maintains coffee taste neutrality and eliminates the need for frequent maintenance by utilizing a smooth granite surface and a controlled grinding gap width for efficient dry-grinding into a fine coffee powder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional metal grinding rollers with grooves are used for dry-grinding coffee, then grinding efficiency is improved, but the grinding rollers are heavily stressed and require frequent renewal at great expense
Solution Approach 1:
The invention changes the material parameter of the grinding rollers from metal to granite. This material substitution fundamentally alters the wear characteristics and stress distribution, allowing the rollers to withstand dry-grinding of coffee without the frequent renewal required by metal rollers with grooves
Solution Approach 2:
The invention uses granite, a natural composite material with hard and soft grain zones homogeneously distributed throughout its structure. This composite nature allows different zones to wear at different rates, self-maintaining the grinding surface without requiring refurbishment
2Productivity
If conventional metal grinding rollers are used, then grinding function is achieved, but coffee taste is adversely affected
Solution Approach 1:
The invention changes the material composition parameter from metal to granite, which is chemically inert and does not impart metallic flavors or contaminants to the coffee. This material substitution eliminates the harmful effect on coffee taste while maintaining effective grinding function
3Manufacturing precision
If grinding rollers are renewed frequently to maintain performance, then grinding quality is preserved, but maintenance costs increase greatly
Solution Approach 1:
The granite grinding rollers exhibit self-service wear characteristics where the hard and soft grain zones wear at different rates, automatically maintaining an optimal grinding surface profile without external intervention. This self-maintaining property eliminates the need for frequent refurbishment and reduces maintenance costs significantly
Solution Approach 2:
The invention changes the wear resistance parameter by using granite material, which has superior wear characteristics compared to conventional metal rollers. This material property enables long-term operation while maintaining grinding quality, reducing the frequency and cost of maintenance
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 roller mill effectively produces a fine coffee powder with a D1-value of 100 μm or less, maintaining coffee taste and reducing maintenance costs by using granite rollers that wear evenly, ensuring consistent performance without the need for refurbishment.
Implementation Method 1
Granite has hard and soft grain zones that are homogeneously distributed, and which wear out differently when dry-grinding coffee and provide the material with a better grip
Data Source
AI summary
The present invention relates to a roller mill for coffee, a method for grinding coffee, and an application of grinding rollers for grinding coffee. In order to grind coffee, conventionally metal rollers are used which are subject to heavy wear and adversely affect the taste of the coffee. The object of the invention is to provide a roller mill for coffee, a method of grinding coffee and a corresponding application thereof that avoids these disadvantages. This is achieved by means of a roller mill for coffee with grinding rollers in opposite directions and having granite surfaces at a peripheral velocity ratio of the rollers 1:1.5 to 1.4, and by means of a corresponding application and corresponding method.