13 Things You Should Know About Machine Espresso That You Might Not Have Considered > 자유게시판

How Does Machine Espresso Work?

Machine espresso employs precise pressure and incredible filter technology to produce the perfect cup of coffee. How exactly does it work?

Espresso is produced by pushing hot water at high pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the main difference.

The Head of the Group

As the name suggests, the group head is where you insert your portafilter when making espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure of the resulting extraction. There are numerous kinds of group heads each with distinct advantages and disadvantages. Some are specifically designed for temperature stability while others are designed to handle pre-infusion. Others are made to control the lever. There are also some that come with a range of features, such as the E61 one, which is to be the most popular among baristas due to its ability to offer multiple benefits in one package.

As you can see from the picture above, the group head is equipped with several notches. You place your portafilter into these notches and twist the head to secure it. A rubber gasket is located in the notches to create a seal while you insert your portafilter. The notches permit the precise placement of the portafilter. This is crucial for a consistent extraction.

The group head is not just able to allow you to put in your portafilter easily but also maintains an even temperature. It does this by circulating hot water through the brew basket, and around the portafilter, ensuring that it's always at the right temperature for extraction. It is important to remember that even a tiny differences can make the distinction between a good and excellent espresso.

The Pump

The motorized pumps in espresso machines rotary provide nine atmospheric bar pressure required to extract espresso. This differs from manually operated piston machines that employ a lever. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be less expensive and last for longer than piston-driven machines. However, both kinds of machines are susceptible to degrading due to overuse and poor cleaning. They also make mechanically complex which can result in a high price tag on even the simplest models.

Some espresso machines remove the pump entirely and employ steam pressure to create commercial espresso machine. This can result in over-extraction because the boiler that produces steam also heats the water to boil. In addition, these machines frequently have to rebuild their pressure between cups, which requires time and energy.

A large majority of espresso machines employ an rotary or a vibration pump. A vibration model employs a vibrating disk to generate pressure, whereas a circular model pushes hot liquid through the ground at a fast speed. Both types of machine are capable of producing excellent espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the part that heats water to the optimal temperature to extract. The steam produced gets to the portafilter which is a container for espresso grounds. It is then pumped into the cup. During this process, the steam creates pressure to push through the grounds of the coffee. This creates a layer crema on top. This is one of the main characteristics of a great espresso.

There are three types of espresso makers. They differ in the kind of pump they use and the degree of heat that the espresso is. There are different ways to control the brew and the size of cup that can be made by the machine.

The first espresso machines were steam-type. They employed one boiler to make both brew and steam, however the pressure they were able to produce was not very high - two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. This is why Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most commonly used espresso maker is a semiautomatic machine with an electric pump. When people think of buy espresso machine machines, they envision these machines. Semi-automatic machines require you to grind and tamp the beans by yourself The pump, however, regulates the water flow and pressure. This is an excellent compromise between human touch and the mechanized accuracy.

The Filter

Typically, espresso machines have filters to separate the coffee grounds as they pass through the hot water. The filter is also a vital component of the machine's temperature control, as it prevents overheating.

Filters also aid in flavor as it allows for the beans to flower for a longer period of time. This lets the beans release their flavors, and also allows for better extraction.

It is important to keep in mind that even the finest filter can make a bad cup of coffee. The quality of the beans and the extraction process are still very important.

It's in this area that the magic occurs. This is what makes espresso taste so good. The grouphead (also called the brewhead) is where you place the portafilter, the device used to place the grounds of your coffee into when making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to produce steam. The steam then pushes hot water through grounds of the coffee and espresso maker under pressure. These machines are cheaper and are easier for the user to maintain than pumps-driven models. However, they are limited in their ability to provide the ideal conditions for brewing since they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

In recent years, espresso machines driven by compressed air-pump have become increasingly popular. They use an air-compressor to push hot water across the ground and are more mobile than electric steam-driven espresso machines.