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How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and incredible filter technology to produce the delicious coffee we enjoy. What exactly does it work?

Espresso is made by pushing hot water under pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the major difference.

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 that results from the extraction. There are a variety of group heads, each with its own advantages and drawbacks. Some focus on temperature stability, whereas others on pre-infusion capabilities, and still others are designed to control the lever. Some include a combination like the E61. This is a very popular choice for baristas since it provides multiple advantages in a single package.

As you can see from the image above the group head is fitted with several notches. The portafilter is placed inside these notches, and then turn the head around to secure it. A gasket of rubber is situated inside the notches to help make a seal when you insert your portafilter. The notches allow for precise placement of your portafilter. This is vital for an accurate extraction.

Apart from allowing you easily insert your portafilter, the group head is responsible to maintain an even temperature. It does this by cycling hot water through the brew container and around the portafilter to ensure that it's always at the right temperature to extract. This is crucial, since even a small difference in temperature can make the difference between good and great espresso.

The Pump

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

Pumps are typically less expensive and last for longer than piston-driven machines. However, both types of machines can deteriorate because of frequent use and insufficient cleaning. Pumps are also more complex mechanically, which can raise the cost of even the simpler models.

Some espresso machines employ steam pressure instead of a pump to make espresso. This can cause over-extraction because the boiler that makes steam also warms the water to boil. Additionally these machines typically have to restore their pressure between cups, which takes time and energy.

Many espresso machines utilize either a rotary or vibration pump, which has a vibration model using a vibrating disc that generates the pressure, and rotating models that push hot water through the grounds under high speed. Both models can make excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part which heats the water to the ideal temperature for extraction. The resultant steam then reaches the portafilter containing the ground espresso coffee, and is then funneled down into the cup. The steam causes enough pressure to push the grounds of the coffee through. This results in a layer crema that is then poured over. This is one of the hallmarks of a good espresso.

There are three kinds of italian espresso machines makers, and they differ in the type of pump they use and the degree of heat that the espresso is. There are various ways in which the brew could be controlled and the size of the cup the machine can produce.

The first espresso machines were steam-based. The first espresso machines were steam-type machines. The coffee tasted bitter and burned. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most commonly used espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they envision these machines. With a semi-automatic machine, you grind the beans and tamp them by hand, but the pump provides regulated water flow and pressure. This is a great compromise between the human touch and the mechanised quality.

The Filter

Typically, espresso maker machines use filters that separate the grounds of the coffee as they go through the hot water. The filter is also a vital element of the machine's temperature control, since it stops overheating.

It also aids in flavor, as a filter lets you enjoy a longer bloom time. This lets the beans release their flavors, and allows for better extraction.

It is important to keep in mind that even the best ground coffee for espresso machine; http://polimentosroberto.com.br/index.php?option=com_k2&view=itemlist&task=user&id=4326777, filter can make a bad cup of coffee. The quality of the beans and the extraction, are still crucial.

It's in this area that the magic occurs. This is what makes cheap espresso machine taste so delicious. The grouphead (also known as the brewhead) is where you put the portafilter, the thingy that you put the grounds of coffee into when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam, which is then pushed through the grounds under high pressure. These kinds of machines tend to be cheaper and easier to maintain than pumps-driven models. However, they are not as efficient in their ability to provide the perfect brewing conditions since they operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bars.

In recent years, compressed-air-pump-driven pro espresso machine machines have been gaining popularity. They use an air compressor to force hot water into the grounds and are significantly more portable than steam-driven electric machines.