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How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How exactly does it work?

To make espresso hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee and espresso machine, but the major difference is in the pressure.

The Head of the Group

The group head is the portafilter is inserted when you are making espresso. It is responsible for dispersing the water into the portafilter and then controlling the pressure of the extraction. There are a variety of types of group heads each with its unique advantages and drawbacks. Some are designed to provide temperature stability while others are built to handle pre-infusion. Others are built to control the lever. Some have a combination, such as the E61. This is a popular choice among baristas as it provides a variety of advantages in a single package.

As you can see in the picture above the group head is equipped with several notches. You place your portafilter in these notches, then twist the head to lock it. There is also a gasket made from rubber that resides inside the notches and helps create a seal when you insert your portafilter into the machine. The notches on the head permit a precise location of the portafilter which is essential to ensure a consistent extraction.

Apart from allowing you effortlessly insert your portafilter the group head is also responsible to maintain 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 correct temperature for extraction. It is important to remember that even a slight variation can mean the difference between a decent and a great espresso.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever to pressurize water, rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure required for espresso extraction. The pressure builds by removing tap water from a reservoir and pumping it through a heat exchanger prior to being shot through the ground coffee inside the group head.

Pumps are typically cheaper and last longer than piston-driven machines. However, both types of machines can deteriorate due to excessive use and poor cleaning. Pumps are also more complex mechanically, and can add to the cost of even the simple models.

Some espresso machines do away with the pump completely and instead employ steam pressure to create espresso. This can cause over-extraction because the boiler that makes steam also heats the water until it comes to a boil. Additionally these machines typically have to restore their pressure between cups, which requires time and energy.

Many espresso machines utilize an rotary or vibrating pump, which is a vibration model that uses a vibrating disc to create the pressure, and a rotary model pushing hot water through the grounds at high speed. Both models are capable of producing excellent espresso, espressomachines (yogaasanas.science blog post) however Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler will heat the water to a temperature that is ideal to extract. The steam that is created is then directed to the portafilter, which contains the espresso coffee grounds. The steam is then channeled into the cup. During this process, steam creates pressure that pushes through the coffee grounds. This results in a crema on top of the espresso. This is one of the main characteristics of a great espresso.

There are three kinds of espresso machines, each having different pumps and brew temperature. There are also different ways in which the brew could be controlled as well as the size of the cup that the machine can make.

The first espresso machines were steam type. The first espresso coffee machine with milk frother machines were steam-type machines. This led to the coffee tasting burnt and bitter. The modern buy espresso machine machine was invented by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most popular mini espresso machine maker is a semi-automatic machine with an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp the beans on your own however the pump controls the water flow and pressure. This is a great compromise between human control and mechanized reliability.

The Filter

Typically, espresso machines utilize filters that separate the coffee grounds as they pass through the hot water. The filter is also a crucial element of the temperature control system as it prevents the machine from overheating.

It also enhances flavor, as it allows for a more prolonged bloom time. This allows the beans to release their nuances and gives an opportunity to improve extraction.

However, it is important to keep in mind that even a high-quality filter can result in a poor cup of coffee, since the quality of the beans and extraction is essential.

It's here that the magic takes place. This is what makes espresso taste so delicious. The grouphead, sometimes called the brew head, is the place where the portafilter (the thing you put the coffee grounds into) sits when you're making espresso.

Steam-driven espresso machines make use of hot water heated in an airtight container to produce steam. The steam then pushes hot water into the grounds of the coffee under pressure. These types of machines are generally less expensive and easier to maintain than pumps-driven models. They are however limited to create the perfect conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

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