Common grinding thickness of coffee powder-the difference between pressurized and unpressed coffee powder

Common grinding thickness of coffee powder-the difference between pressurized and unpressed coffee powder

French filter press, plug air, drip filter or mocha pot do not require high fineness of coffee powder. Knife milk grinder (commonly known as bean chopper or propeller grinder) can not adjust the scale, but to adjust the size of coffee powder according to the length of time, the size of coffee powder is uneven, so it is not suitable for making espresso. It is generally believed that as long as you have an espresso machine, you can make delicious Italian coffee, which is only half right, and the other half depends on a more sophisticated double-gear bean grinder. The lower gear of this bean grinder is connected to a powerful motor, providing a force for high-speed rotation, while the upper gear is connected to the scale and twisted in the reverse clockwise direction, the reading of the scale is getting smaller and smaller, and the upper gear is falling, narrowing the distance between the upper gear and the lower gear. This means that the finer the coffee powder is ground. If the upper gear is twisted in the clockwise direction, the larger the scale value is, the higher the upper gear is and the larger the distance between the upper gear and the lower gear is, so the coffee powder is thicker.

The double-gear bean grinder sets the size of the coffee powder by adjusting each other's height, but don't underestimate this kind of bean grinder. Its structure is extremely precise. Without the double-gear bean grinder, it is impossible to make thick, authentic espresso.

Visual observation of the quality of espresso

This is the biggest variable, because our body is not an instrument, the strength of pressing powder is based on the feel, there is no feel for the novice, only powerful and small, even for the veteran on the bar, the first or second cup every day is to find the feeling of strength, because we may directly affect the exertion of strength because of our physical state and even mood on that day.

But it is also this point, I think it can increase the stability most. When you use the same kind of beans, find the scale, determine the amount of powder, and use a force that you think is more comfortable to press the powder, if you can make a decent cup of esp, you will basically be done. The reason why it is said that the powder pressing strength adjustment can increase stability, because the scale and powder loading, as well as the beans themselves will have a certain small error due to the environment. In most cases, this error can be improved by the weight of pressing powder to achieve a stable extraction effect.

Why is it different when you change beans? Is it bad for beans?

The overall composition and density of different varieties of beans in different producing areas are different, and different baking degrees will also cause differences in hardness, resulting in changes in grinding speed and particle size, so that before the bean powder thickness scale, powder quantity, powder pressing strength appears to be a little weak, just like you can't put your wife's shoes on your feet. Therefore, many foreign restaurants use fixed bean grinders for fixed beans in order to ensure the stability of their grinding effect as far as possible.