Espresso extraction time-the difference between American and Italian concentrate

Espresso extraction time-the difference between American and Italian concentrate

In the coffee machine hardware that we often talk about, the most common mention is the size of the boiler and the pump (pump). In fact, there are many other things to pay attention to in the coffee machine. The design of different pipes of the material will affect the effect of a cup of coffee. This is also why responsible manufacturers use copper or stainless steel as the main material of the coffee machine. First, copper has good thermal conductivity (to ensure uniform and stable temperature) and ductility, and metal fatigue is not easy to occur even in frequent alternation of cold and heat. Stainless steel is more hygienic and durable. Because stainless steel appeared relatively late, many manufacturers still use traditional copper to make coffee machines. Materials such as plastic and aluminum are completely unreliable, but household machines are commonly used and cheaper.

Italian coffee machine uses pump to generate pressure, which is roughly divided into shock type and rotary type. Vibrating type is compact in size and low in cost, which is mostly used in household machines, such as XX coffee machine, pump pressure 15bar or pump pressure 19bar, which means that the peak pump pressure can reach 15bar or 19bar, but does not stabilize in a single value, but fluctuates between 1--15bar. This is also one of the reasons why the coffee made by household machines has a lot of miscellaneous flavor. Similarly, this is another basis that I do not think the cone knife grinder can bring a deep flavor, because if this logic is true, the unstable pressure of the vibration pump will also bring different levels of flavor. The lower the controllability in brewing, the worse the taste stability.

The rotary pump is mainly used in commercial machines and high-end professional household machines because of its large size. The pressure can be stabilized within a fixed value, from a straight point of view, the pressure curve of the vibrating pump is fluctuating, while the pressure curve of the rotary pump tends to be a straight line, the two are not the same. The use of rotary pump is a major element of stable extraction. In addition, the noise of rotary pump is much lower than that of vibrating pump, and some vibrating pump noise makes people feel unsafe and cheap, and noise can also affect people's mood, so it is not recommended to use vibrating pump coffee machine as a business machine.

At present, the standard of esp brewing theory is 9 ±1 and 9 ±0.5,9 ±2 respectively. Here in order to facilitate the memory and understanding of the individual is set at 9. When you want to present a skill in words, you will find a lot of inconvenience. In terms of powder pressing, it is roughly divided into coarse powder heavy pressure school, fine powder light pressure school and non-pressure school, no matter which school you belong to can make different styles of perfect esp, of which the non-pressing powder school is the most minority and difficult to master, because it takes a lot of energy and time to find the critical point of powder quantity and powder thickness, and has certain requirements for bean grinders. The advantage of non-pressing powder is that once found, the failure of powder pressing can be avoided. But because there are so many variables in making a cup of coffee, it's okay to be proficient in light pressure and heavy pressure as a new experience, but if you don't press here, you won't recommend it.