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

• 페이스북 공유
• 트위터 공유
• 

How Does Machine Espresso Work?

Machine espresso machine coffee makes use of precise pressure and mind-blowing filter technology to create the perfect cup of coffee. What exactly is it?

To make espresso hot water is pushed 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 disperses water in the portafilter and controls the pressure of the extraction. There are many different types of group heads, each with its own advantages and disadvantages. Some are focused on temperature stability, some on pre-infusion capabilities, and still others are designed to control the lever. Some are a combination, like 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 photo above, the group head is fitted with a variety of notches. You place your portafilter inside these notches, and then twist the head to lock it. There is also a gasket made of rubber that is a part of the notches to help create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is essential to ensure an even extraction.

The group head not only lets you to place your portafilter easily but also maintains the temperature at a constant level. It does this by circulating hot water through the brew container and around the portafilter, ensuring that it is always at the correct temperature for extraction. It is important to note that even a slight deviation can make the difference between a good and a excellent espresso.

The Pump

Motorized pumps in rotary espresso machine coffee machines provide the nine atmospheric bar pressure needed to extract espresso. This is different from manual piston machines that use levers. This pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger prior being shot through the ground coffee in the group head.

Pumps are typically less expensive than piston-driven machines and tend to last longer. However, both types of machine can become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which could increase the cost of even the simple models.

Some espresso machines use steam pressure instead of a pump to make espresso. This can lead to over-extraction as the boiler that makes steam also heats the water to boil. The machines must also constantly rebuild their pressure between cups. This takes energy and time.

A majority of espresso machines utilize a rotary or vibration pump. A vibration model uses the vibrating disk to create pressure, while the circular model pushes hot liquid through the ground at high speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to fail.

The Boiler

The boiler is what is used to heat the water to the ideal temperature for extraction. The steam created is then directed to the portafilter, which is a container for espresso grounds. It is then funneled into the cup. During this process, steam creates pressure that pushes through the grounds of the coffee. This results in a layer crema that is then poured over. This is one of the main characteristics of a great espresso.

There are three distinct types of espresso machines, each having different pumps and brew temperature. There are different ways in which the brew could be controlled and the size of the cup the machine is capable of making.

The first espresso machine black friday machines were steam-based. They had a single boiler to make steam and brew, however, the pressure they could produce was very low - just two bars of atmospheric pressure, at most. This led to the coffee tasting bitter and burnt. This is the reason Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most common espresso maker is a semiautomatic machine that has an electric pump. When people think of espresso machines espresso, they think of these machines. With a semi-automatic machine you grind the beans and tamp them yourself but the pump provides regulated water flow and pressure. This is an excellent compromise between human touch and the mechanized accuracy.

The Filter

Typically, espresso machines employ filters that separate the grounds of the coffee as they go through the hot water. The filter is also an essential part of the temperature control system, as it prevents the machine from overheating.

It also enhances flavor, as a filter lets you enjoy a longer bloom phase. This helps the beans to release their flavors and provides an opportunity for better extraction.

It is important to keep in mind that even the most efficient filter could result in a poor cup of coffee. The quality of the beans, and the extraction process remain crucial.

It's in this area that the magic occurs. This is the reason why espresso tastes so good. The grouphead (also called the brewhead) is where you place the portafilter, which is the thingy that you use to put the grounds of your coffee into when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to create steam. Steam is then pushed through the grounds at high pressure. They are less expensive and easier for the user to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the ideal conditions for brewing because they operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bars.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They use an air compressor to push hot water through the grounds and are more portable than steam-driven electric machines.