Which type of grinder is characterized by a flat burr?

The type of grinder characterized by a flat burr is known as a flat grinder. Flat burr grinders utilize two parallel flat burr plates to crush the coffee beans. This design allows for a consistent particle size and a uniform grind, which is highly important for brewing methods that require precision, such as espresso. The flat burrs can produce a more even extraction because they create less friction and heat compared to other designs, which helps in preserving the flavor and quality of the coffee.

In contrast, conical grinders have a different burr design that looks like a cone fitting into a ring, providing a different grinding action and often leading to a different taste profile. Roller grinders utilize cylindrical rollers to crush the beans, typically used for larger-scale operations rather than for fine, consistent grinds. Blade grinders use a spinning blade to chop the coffee, which can lead to uneven sizes and does not produce the consistent grind necessary for optimal coffee extraction.