What's the difference between a coffee grinder and a flat knife? which brand is good?

What is the difference between coffee grinder ghost teeth and peace knife? Which brand is good?

Advantages and disadvantages of the knife:

The flat cutter grinder consists of an upper cutter disc and a lower cutter disc, the base is fixed on the motor, and when the motor is started, the upper cutter disc and the lower cutter disc are rotated to generate cutting action.

As coffee particles fall from the center, the rotating blade at the bottom rotates the beans to the periphery, pushing them into the toothed blade section for grinding.

The upper and lower cutter plates of the flat knife are placed in parallel, so the coffee beans need to rely on the rotating force of the bottom cutter plate to push the coffee beans into the cutter plate, so the weight of the coffee beans placed above will affect the uniformity of the coffee beans entering the cutter plate, which in turn affects the uniformity of grinding; In addition, due to the pushing, the number of collisions between the coffee beans increases, resulting in an increase in the proportion of fine powder. This is the reason why the particle uniformity of the common flat knife grinder is slightly poor and the fine powder is more. However, the coffee particles ground by the flat knife are flaky, and the flake can increase the cell wall area, so the coffee concentration and extraction rate can be improved in a short time with the flat knife, so that the coffee aroma can be significantly improved in a short time. At the same time, because of its flat shape and small volume, when the extraction time becomes longer, the xylem of the particles will absorb too much water, resulting in increased foreign taste and astringency.

Advantages and disadvantages of cone knife:

Cone knife grinder is placed at the bottom of the conical cutter disc, and then with the outer ring cutter disc to grind, coffee beans fall from above, coffee beans will be pulled down with the rotation of the conical cutter disc, and then produce grinding action, but also because of the relationship from top to bottom, so the particles can be pushed out without pushing coffee, compared with the flat knife grinder, the number of collisions between particles will be reduced a lot, so the proportion of fine powder produced by the cone knife will be reduced a lot compared with the flat knife, And the coffee grind uniformity will be greatly improved. The particles ground by the cone knife will be close to the particle shape, resulting in a longer water absorption path of the coffee particles, and it takes a longer time to contact the water inside, so the soluble substances released by the cone knife particles in the initial stage will be less, resulting in a concentration that is not too high in a short time.

Summary: When you need to get a higher concentration of coffee in a short time, flat knife grinder is a good choice, high concentration will also make the aroma rich, so the use of flat knife its aroma will be much more obvious than the cone knife; When you need better taste, the granular coffee powder produced by the cone knife can reduce the xylem contact time, although the aroma is not as obvious as the flat knife, but even if the extraction time is prolonged, the taste is still better.

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