US Patent 8690087 Roller mill for coffee

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.