9 . What Your Parents Taught You About Machine Espresso > 자유게시판

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How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and incredible filter technology to produce the perfect cup of coffee. What exactly is it?

espresso machine with milk frother is made by forcing hot water under pressure through finely-ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.

The Head of the Group

The group head is the portafilter that you place in the espresso 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 kinds of group head each with its distinct advantages and Machine Espresso disadvantages. Some focus on temperature stability, whereas others on pre-infusion options, and others are designed to control the lever. There are even some that contain a variety of features, like the E61 that is the standard choice for many baristas due to its ability to offer multiple benefits in one package.

As you can see in the photo above, the group head has several notches to place your portafilter and twist it with your hands to secure it. A gasket made of rubber is positioned inside the notches to help create a seal as you insert your portafilter. The notches permit precise placement of your portafilter. This is crucial for a consistent extraction.

Apart from allowing you easily place your portafilter in, the group head is also 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 correct temperature to extract. It is important to remember that even a few degree difference can make the difference between a decent and a great espresso.

The Pump

The motorized pumps that are used in rotary espresso machines provide the nine atmospheric bar pressure needed for espresso extraction. This differs from manual piston machines that rely on levers. This pressure is generated by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven machines, and tend to last longer, however both types of machines may get damaged through overuse and lack of cleaning. They also make mechanically complex that can lead to the cost of even the simplest models.

Some espresso machines make use of steam pressure instead of a pump in order to brew espresso. This can cause over-extraction because the boiler that produces steam also heats the water until it comes to a boil. Additionally, these machines frequently have to rebuild their pressure between cups, which requires time and energy.

Many espresso machines uk machines make use of a rotary or vibration pump. A vibration model utilizes a rotating disk to generate pressure, whereas a Rotary model pushes hot coffee through the ground at a rapid speed. Both types of machines can make excellent espresso, however the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler heats the water to the right temperature to extract. The resultant steam then reaches the portafilter that contains the ground espresso coffee, and is then pumped into the cup. The steam creates pressure that pushes through the coffee grounds. This results in a crema on the top of the espresso. This is a hallmark of a good espresso.

There are three different types of espresso machines, each with different pumps and brew temperature. There are various ways in which the brew can be controlled, as well as the size of the cup the machine is capable of making.

The first espresso machines were steam type. They employed one boiler to create both steam and brew however the pressure they were able to create was minimal - two bars of atmospheric pressure at the most. The coffee tasted bitter and burnt. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic device with an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp your beans yourself however the pump controls the water flow and pressure. This is a fantastic solution that combines human control with mechanised consistency.

The Filter

Espresso machines typically have a filter that separates the grounds of coffee from hot water. The filter is also an essential part of the machine's temperature control, as it prevents overheating.

A filter can also help with flavor because it allows for a longer flowering phase. This helps the beans to release their flavors and provides the chance for better extraction.

It is important to keep in mind that even the best small espresso machine filter could result in a poor cup of coffee. The quality of the beans and the extraction process remain vital.

It's in this area that the magic takes place. This is what makes espresso taste so good. The grouphead, sometimes referred to as the brew head, is where the portafilter (the thing you put the coffee ground into) sits when you're making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to create steam, which is then pushed through the grounds with high pressure. These types of machines are generally less expensive and simpler to maintain than pump-driven models. However, they are limited in their ability to produce the perfect conditions for brewing, because they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bar.

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