Coffee preparation method: grinding of coffee beans

2023 02/27

The operation of grinding roasted coffee beans into powder is called pulverization. The ideal time to grind coffee is just before brewing. Because the ground coffee is easy to oxidize and lose its aroma, especially if it is not properly stored, the coffee powder is also easy to change the taste, so it is naturally impossible to brew mellow coffee.

Grinding coffee powder with appropriate thickness is very important to make a good cup of coffee. Because the extraction of water-soluble substances in coffee powder has its ideal time, if the powder is very fine and cooked for a long time, resulting in over-extraction, the coffee may be very strong and bitter and lose its aroma; on the contrary, if the powder is thick and cooked too Fast, resulting in insufficient extraction, then the coffee will be tasteless, because it is too late to dissolve the water-soluble substances in the powder.

When grinding beans, the fineness of the powder depends on how they are cooked. In general, the shorter the cooking time, the finer the grind; the longer the cooking time, the coarser the grind. In terms of actual brewing, the Espresso machine takes very little time to make coffee, so it has the finest grind (fine like flour).

The grinding methods of coffee beans can be divided into three types: coarse, medium and fine grinding according to their size, as shown in the table below.

1 finely ground fine grains, the same size as your granulated sugar

2 medium grinds Granules like granulated sugar mixed with white sugar

3 Coarse Grind Coarse, the size of coarse white sugar

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