The grinding methods of coffee beans can be divided into three types according to the size: coarse grinding, medium grinding and fine grinding. Use appropriate grinding methods according to different coffee utensils. There is also a medium-fine grinding or ultra-fine grinding (grinding into powdered coffee powder) that is finer than fine grinding. The grinding time of coffee beans is before brewing coffee, and only the grinding that meets the requirements is the top grade. After coffee beans are ground into powder, the surface area increases, absorbs moisture and is easy to oxidize. In short, with the passage of time, coffee powder will also deteriorate its flavor. Also, after the ground coffee beans are put in, the carbon dioxide trapped inside the coffee beans will be lost with the aroma. When coffee powder is extracted and filtered in this way, it should swell, not swell. No matter what, it is impossible to make delicious coffee. The secret is to consider the consistency of grinding and operation, so that the brewed coffee is the most delicious and mellow. ◎ Fine grinding (fine particles, size of sugar) ◎ Medium grinding (size of particles mixed with coarse sugar) ◎ Coarse grinding (size of coarse particles, size of coarse sugar) The ideal time for coffee grinding is grinding before boiling. Because ground coffee is easy to oxidize and lose its fragrance, especially in the absence of proper storage, coffee powder is easy to taste, and naturally it is impossible to make mellow coffee. The grinding prop of coffee beans is grinding. There are countless grinders, ranging from manual grinders for home use to large electric grinders for commercial use. Home grinder can also be used as an ornament, grinding one at a time, which is more convenient for more people. According to the structure of the grinder, there are two kinds of grinders: one is to grind coffee beans with vertical and horizontal grooves, and the other is to grind coffee with molars. Each has its own strengths, and the business situation is that mass-produced electric models are the mainstream. But we should pay attention to the following two points when grinding coffee beans: ① Friction heat should be kept to a minimum. (Because of fever, the aromatic components will fly away) ② Whether the particle size is uniform. (If the particles are not uniform, the concentration of brewing will be uneven. In view of this, if it is a domestic mill, it should be rotated gently if it is manual, and try not to generate friction heat. So it is more appropriate to use an electric mill. The use of the mill is to grind the beans first and then brew them. There are two types of home pulverizers: manual and electric. If the number of people is small, it is more convenient to use manual mode, and if the number of people is large, it is more convenient to use electric mode. The grinding method (particle size) is determined by matching the bubble extractor. Manual grinding machine should be careful not to only generate friction heat. And pay attention to whether it is doped with other things. Check whether the ground coffee beans are large and tidy. (In the case of uneven particles, it is possible that the role of the mill is always there, or the coffee roasting is asymmetric. )