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

How Does Machine Espresso Work?

Machine espresso uses precision pressure and mind-blowing filter technology to create the perfect cup of coffee. How exactly does it work?

Espresso is produced by pushing hot water under pressure through finely-ground coffee machines espresso. 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 is inserted when you are making espresso. It disperses water in the portafilter, and regulates the pressure of extraction. There are various kinds of group heads each with its distinct 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 such as the E61. This is a preferred choice for baristas as it provides a variety of advantages in one package.

As you can see from the image above the group head is fitted with a variety of notches. You can place your portafilter in these notches, then twist the head to secure it. A rubber gasket is located within the notches to create a seal while you insert your portafilter. The notches permit the precise placement of the portafilter. This is vital for an even extraction.

Aside from allowing you to easily insert your portafilter, the group head is responsible for maintaining a consistent temperature. It does this by cycling hot water through the brew pan and around the portafilter, ensuring that it's always at the correct temperature for extraction. It is important to remember that even a small deviation can make the difference between a decent and a excellent espresso.

The Pump

Motorized pumps in rotary espresso machines provide the nine atmospheric bars of pressure required to extract espresso. This differs from manual piston machines that use a lever. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven machines, and they tend to last longer, although both types of machines could degrade with overuse and insufficient cleaning. They also make mechanically complex, which can result in an expensive price for even the most basic models.

Some espresso machines can eliminate the pump completely and utilize steam pressure to make espresso. This can result in over-extraction because the boiler that makes steam also heats the water until it comes to a boil. These machines also have to continuously rebuild their pressure between cups. This requires energy and time.

A majority of espresso machines utilize the rotary or vibration pump. A vibration model makes use of an oscillating disk to create pressure, whereas a circular model pushes hot liquid through the ground at a high speed. Both machines can produce excellent espresso however rotary machines tend to be more stable, quieter and less likely to break down.

The Boiler

The boiler is the element that heats the water to the ideal temperature for extraction. The resulting steam is then transferred to the portafilter containing ground espresso beans and is then pumped into the cup. The steam causes pressure to push through the grounds of the coffee. This results in a crema on top of the espresso. This is the hallmark of a great espresso.

There are three distinct types of best espresso machine machines, each having different types of pumps and brew temperature. There are also different ways that the brew can be controlled, as well as the dimensions of the cup the maker can create.

The first espresso machines were steam-types. The earliest espresso machines were steam types. The coffee tasted bitter and burnt. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso machine is a semiautomatic that has an electric pump. When people think of espresso machines, they think of these machines. With a semi-automatic buy espresso machine machine, you have to grind the beans and tamp them by hand. However, the pump controls the flow of water and pressure. This is a great compromise between the human touch and mechanized 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, since it helps to prevent overheating.

It also enhances flavor, since a filter allows for a longer bloom time. This lets the beans release their nuances, and allows for a better extraction.

It is important to remember that even the finest filter could result in a poor cup of coffee. The quality of the beans, as well as the extraction, remain vital.

This is where the magic happens, and it's what makes espresso taste great. The grouphead (also called the brewhead) is where you place the portafilter, the thingy that you put the grounds of coffee into when making espresso.

Steam-driven espresso machines use hot water that is heated in an airtight container to produce steam. The steam then pushes hot water into the grounds of the coffee under pressure. These kinds of machines tend bean to cup espresso machine be less expensive and easier to maintain than pump-driven models. However, they are limited in their capacity to create the perfect brewing conditions 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 push hot water through the ground and are more mobile than steam-driven electric espresso machines.