Why the number of coffee machine grindness is smaller and finer?

Introduction of coffee grindability

The blade grinder is another common bean grinder, which works on the principle that a fast rotating blade will cut the coffee beans into fine particles. This kind of bean grinder is usually cheap, but the coffee powder it grinds is of average quality because the blade generates a lot of heat when rotating and cutting. In addition, the size of the coffee powder cut by the blade grinder is uneven, which will greatly affect the final quality of coffee. Usually, the blade grinds the beans to produce a small amount of ultra-fine coffee powder like sawdust, which can cause the coffee to have a negative taste of excessive extraction and bitter taste. These very fine coffee powders can also clog the outlet of the Italian espresso machine or the filter of French-pressed coffee, so it is not recommended to use a blade grinder when making these two kinds of coffee. However, the blade type bean grinder also has certain advantages, compared with the gear type bean grinder, its grinding speed is faster and the noise is lower. Keep in mind that small changes in the particle size of coffee powder will directly affect the final quality of coffee, so we recommend that you use a tapered gear grinder. Bean grinders can be roughly divided into two types: gear type bean grinder and blade type bean mill. The working principle of the gear grinder is that two gear-shaped or conical grindstones rotate quickly to crush the coffee beans between them, generating very little heat in the process. This process of extrusion and crushing can well release the aromatic essence and oils in the coffee, making the coffee taste more mellow and silky. Generally speaking, the grinding degree of the gear type bean grinder is very wide, and it is suitable for all kinds of brewing methods, such as Italian espresso, French pressure coffee, drip filter coffee and so on.

. Other brewing methods do not need to use Italian bean grinder, manual most do not have scale, electric to commonly used little eagle little flying horse is more common, siphon pot is generally 3 degrees, hand 4-5 degrees (depending on the powder thickness of some differences) method pressure 5 degrees, mocha pot 2 degrees, but the relative value should be adjusted according to their own habits and bean grinder conditions. The amount of powder, siphon 10-12g per person, hand flush 12-15g per person plus 8-10g for each additional cup, Mocha pot to fill the powder trough to 89 minutes, French kettle generally 10g per person. The water temperature, grinding thickness, brewing time and powder amount of coffee can be said to be variables in a certain range. Each quantity has a certain amount of controllable space, but after each quantity changes, the other quantities have to change accordingly, so if you really want to master brewing skills, you can only rely on experience.