The Complete Guide To Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso employs precise pressure and mind-blowing filter technology to make the coffee we love. What exactly does it work?

To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Head of the Group

The group head is the portafilter that you place in the espresso and filter coffee machine maker when making it. It is responsible for dispersing water into the portafilter and then controlling the pressure of the extraction. There are many different types of group heads, each with its own advantages and disadvantages. Some are specifically designed for temperature stability while others are designed to handle pre-infusion. Others are built to control the lever. There are also some that have a combination of features, like the E61 that is the standard choice for many baristas due to its capacity to offer multiple benefits in a single package.

As you can see from the image above the group head has a number of notches. It is possible to place your portafilter in these notches and then turn the head around to secure it. There is also a gasket made of rubber which is located inside the notches and helps create an airtight seal when you insert your portafilter into the machine. The notches on the head permit an exact location of the portafilter which is necessary to ensure a consistent extraction.

Apart from allowing you easily place your portafilter in, the group head is responsible to ensure that the temperature remains even. It does this by circulating hot water through the brew container and around the portafilter to ensure that it is always at the right temperature to extract. This is important, as even a few degrees can mean the difference between excellent and great espresso maker barista.

The Pump

In contrast to piston machines that are manually operated, that use a lever to pressurize water, the rotary espresso machines use motorized pumps to provide the nine atmospheric bars of pressure that are required for cheap espresso machine extraction. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive and last for longer than piston-driven machines. However, both kinds of machines may degrade because of excessive use and insufficient cleaning. Pumps are also more complicated mechanically, and can add to the cost of even simpler models.

Certain espresso machines utilize steam pressure instead of a pump for brewing espresso coffee machine for home. The drawback is that the boiler that produces steam also raises the temperature of water to the point of boiling, which can lead to excessive extraction. In addition these machines typically have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines employ a vibration or rotary pump, with a vibration model that uses a vibrating disc that generates the pressure, and the rotary model pushing hot water through the grounds under high speed. Both machines can make excellent espresso, however rotary machines are more quiet, durable and less likely to break.

The Boiler

The boiler makes the water warm to a temperature that is ideal to extract. The steam created gets to the portafilter which is a container for espresso grounds. It is then pumped into the cup. During this process the steam causes enough pressure to push the grounds of the coffee through. This creates a foam on the top of the espresso. This is a hallmark of a good espresso.

There are three distinct types of Espresso Coffee Machine Home machines, each having distinct pumps and the temperature of the brew. There are different ways that the brew can be controlled, as well as the size of the cup the machine can produce.

The first espresso machines were steam-types. They utilized only one boiler to make both steam and brew however, the pressure they could produce was not very high - two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most commonly used espresso maker is a semi-automatic one that has an electric pump. When people think of espresso machines, they think of these machines. If you have a semi-automatic machine you grind the beans and then tamp them by hand. The pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy.

The Filter

Typically, espresso machines use filters that separate the grounds of coffee as they move through the hot water. The filter is also a vital component of the machine's temperature control, as it helps prevent overheating.

A filter also helps with flavor, as it permits a longer flowering period. This lets the beans release their flavor and improves extraction.

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

It's here that the magic occurs. This is the reason why espresso tastes so delicious. The grouphead, also called the brew head, is the place where the portafilter (the thing you put the coffee grounds into) sits when you're making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to produce steam, which then pushes the hot water through the grounds at a high pressure. These kinds of machines are typically less expensive and simpler to maintain than pumps-driven models. They are however limited in their ability to create the perfect conditions for brewing, as they operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, compressed air-driven espresso machines have become more popular. They use an air-compressor to force hot water into the ground. They are also more mobile than steam-driven electric espresso machines.