• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and amazing filter technology to make the perfect cup of coffee. How does it work exactly?

Espresso is created by forcing hot water under pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Group Head

The name implies the group head is where you place your portafilter when brewing espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure that results from the extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are designed to provide temperature stability while others are specifically designed to handle pre-infusion. Some are designed to control the lever. Some include a mix of features, like the E61 one, which is the most popular choice among baristas due to its capacity to offer multiple perks in a single package.

As you can see from the picture above the group head is fitted with several notches. You can place your portafilter in these notches, then twist the head to lock it. A rubber gasket is located inside the notches, which helps make a seal when you insert your portafilter. The notches on the head allow for a precise location of the portafilter which is necessary for an even extraction.

In addition to 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 pan and around the portafilter to ensure that it's always at the right temperature for extraction. This is important because just a few degrees could make the difference between a good and great espresso.

The Pump

Contrary to manual piston machines that use a lever to pressurize water, Rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure that are required to extract espresso coffee machine Home. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.

Pumps are typically cheaper and last longer than piston-driven machines. However, both kinds of machines may degrade due to overuse and poor cleaning. They also make mechanically complex that can lead to a high price tag on even the simplest models.

Some espresso machines make use of steam pressure instead of a pump for brewing professional espresso maker. The disadvantage of this is that the boiler that produces steam also increases the temperature of water to boiling which can cause excessive extraction. Additionally the machines often have to rebuild their pressure between cups, which takes time and energy.

A majority of espresso machines utilize an rotary or a vibration pump. A vibration model employs the vibrating disk to create pressure, whereas the rotating model pushes hot water through the ground at a high speed. Both machines produce great espresso however rotary machines tend to be more stable, quieter and less likely to break.

The Boiler

The boiler makes the water warm to the perfect temperature to extract. The steam produced gets to the portafilter which holds the espresso grounds. It is then pumped into the cup. The steam is able to create enough pressure to push the grounds of coffee through. This produces a layer of crema on top. This is a sign of a great espresso.

There are three types of espresso makers, and they differ in the type of pump they employ and how hot the best coffee espresso machine is. There are many ways to control the strength of the brew and the size of cup that can be produced by the machine.

The first espresso machines were steam-types. They employed a single boiler to make both brew and steam, however the pressure they were able to produce was very low - just two bars of atmospheric pressure maximum. The coffee tasted bitter and burnt. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most popular espresso maker is a semiautomatic machine that has an electric pump. When people think of espresso machines, they imagine these machines. Semi-automatic machines require you to grind and tamp your beans yourself, but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and 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 an essential element of the machine's temperature control, since it stops overheating.

A filter also improves flavor as it allows for a longer flowering phase. This allows the beans to release their flavors, and allows for a better extraction.

However it is crucial to remember that even a high-quality filter can produce a bad cup of coffee, since the quality of the beans and extraction is still vital.

It's here that the magic takes place. This is the reason why compact espresso machine tastes so delicious. The grouphead, sometimes referred to as the brew head, is the place where the portafilter (the container you place the coffee grounds into) is located 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 is then pushed through the grounds at a high pressure. They are less expensive and easier for the user to maintain than pumps-driven models. However, they are limited in their ability to provide the perfect conditions for brewing, as they only operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bar.

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