Fine Coffee Bean Technology coffee Grinding process

(i) Principle of grinding

In general, a good grinding method should include the following four basic principles:

1. The grinding degree suitable for brewing method should be selected;

2. The temperature of cattle produced during grinding should be low;

3. The powder after grinding should be uniform;

4. Grind before brewing.

No matter what kind of grinding machine is used, it will certainly generate heat by friction during operation. Most of the fine substances are highly volatile, and the heat of grinding will increase the speed of volatilization, so that the aroma of coffee is lost in the air. After coffee beans are ground, the cell wall will completely disintegrate, and the area in contact with the air will increase a lot. The oxidation and deterioration speed will become faster, and the coffee will lose flavor within 30 seconds to 2 minutes. Therefore, it is recommended not to buy coffee powder, it is best to buy coffee beans, grind before drinking, grind well, you should quickly brew.

Before the bean grinder was invented, humans ground coffee beans using stone pestles and bowls. A foreign doctor once experimented with this ancient tool and compared it with a modern bean grinder. It is said that the coffee powder ground by the pestle and stone bowl can best soak out the mellow flavor.

According to logical reasoning, the pestle should not destroy the cell wall and retain the good substances of coffee by making coffee beans naturally split by impact. However, in modern life, it is almost impossible to use pestle and stone bowl to grind coffee beans, so it is particularly important to choose a good bean grinder.

(ii) Method of grinding

Coffee beans grinding method according to its size can be divided into coarse grinding, grinding and fine grinding three kinds. Use appropriate grinding methods depending on the coffee appliance. There are also medium or finer ground and fine ground (powdered coffee powder).

1, fine grinding (Finegrind): fine particles, like the size of sugar.

Mediumgrind: Particles are the same size as granulated sugar mixed with coarse white sugar.

Regulargrind: coarse particles, the same size as coarse white sugar.

(3) The secret of grinding

1. The grinding tool of coffee beans is a bean grinder. There are three types of bean grinders:

(1)Household manual rotary bean grinder. Suitable for leisure people with small demand, large particles and plenty of time.

(2)Electric bean grinder for home use. Coffee powder of various particle sizes can be ground, and 6 people can be ground at a time.

(3)Professional electric bean grinder. For commercial use, it can grind out about one pound of coffee powder at a time.

2, grinding coffee beans should pay attention to the following two points:

(1)Reduce grinding heat. Grinding heat will cause coffee aroma to dissipate early.

(2)The particle size is uniform. Uneven particle size will lead to brewing time can not be controlled.

Therefore, if you use a home-style manual grinder, rotate it gently so that it does not generate frictional heat as much as possible. To sum up, if you consider the quality of ground beans, the amount of ground beans, and the use of time and convenience, the use of household electric grinder will be the best choice.