Coffee equipment cone knife grinder ghost teeth, flat knife which is better

coffee making facilities

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 coffee grind uniformity will be greatly improved. The particles ground by the cone knife will be close to the granular shape, resulting in a longer water absorption path of the coffee particles, and it takes a longer time to contact the water inside. Therefore, the soluble substances released by the cone knife particles in the early stage will be less, resulting in a concentration that is not too high in a short time. At the same time, because of the granular shape, even if extracted for a long time, the xylem absorbs less water, and it is less likely to produce miscellaneous taste and astringency.

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 more obvious than the cone knife; When you need better taste, the cone knife produced granular coffee powder can make the xylem contact with water time reduced, although the aroma is not as obvious as flat knife, but even if the extraction time is prolonged, the taste is still better