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

How Does Machine Espresso Work?

Machine espresso employs precise pressure and amazing filter technology to make the delicious coffee we enjoy. How does it work exactly?

Espresso is made by forcing hot water at high pressure through finely-ground coffee. The process is similar to that of making drip coffee. However, it is the pressure that makes the main difference.

The Head of the Group

The group head is the portafilter you insert when brewing espresso. It disperses water in the portafilter, and regulates the pressure of extraction. There are many different types of group heads each with their own advantages and drawbacks. Some are designed for the stability of temperature while some are built to handle pre-infusion. Some are designed to control the lever. Some have a combination, such as the E61. This is a favorite among baristas because it offers multiple advantages in one package.

As you can see in the above image The group head features several notches where you place your portafilter and twist it by hand to lock it in. A gasket made of rubber is positioned inside the notches to help make a seal when you insert your portafilter. The notches on the head allow for an exact location of the portafilter which is vital for an even extraction.

In addition to allowing you easily place your portafilter in, the group head is responsible for maintaining a consistent temperature. It does this by circulating hot water through the brew basket and around the portafilter to ensure that it is always at the correct temperature for extraction. This is vital, because even a few degrees can make the difference between good and great espresso.

The Pump

The motorized pumps that are used in espresso machines that rotate provide the nine atmospheric bar pressure needed for espresso extraction. This differs from manually operated piston machines that employ levers. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven machines, and tend to last longer, but both types of machines can get damaged through overuse and lack of cleaning. They also make mechanically complex that can lead to costly prices for even the simplest models.

Certain retro espresso machine machines can eliminate the pump completely and use steam pressure to brew espresso. The drawback is that the boiler that produces steam also raises the temperature of water until it reaches boiling which could lead to excessive extraction. They also have to constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines make use of either a vibration or rotary pump. A vibration model makes use of an oscillating disk to create pressure, whereas the rotating model pushes hot water through the ground at a rapid speed. Both types of machine can produce an excellent espresso, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is what heats the water to a temperature that is ideal for extraction. The steam that is produced reaches the portafilter, which holds the espresso grounds. It is then poured into the cup. The steam creates pressure and pushes through the grounds of the coffee. This produces a layer of crema on top. This is the hallmark of a great espresso.

There are three types of espresso makers, and they differ in the kind of pump they use and how hot the espresso is. There are many ways to control the brew and the size of cup that can be made by the machine.

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

The most commonly used espresso coffee maker machine is a semiautomatic with an electric pump. When people think of espresso machines espresso machines, they envision these machines. With a semi-automatic machine, you grind the beans and then tamp them by hand. However, the pump is able to regulate the flow of water and pressure. This is a fantastic solution that combines human control with mechanised consistency.

The Filter

Espresso machines usually have filters that separate the grounds of the coffee from hot water. The filter is also a vital component of the temperature control system as it prevents the machine from overheating.

A filter also helps with flavor since it allows for an extended flowering time. This lets the beans let their nuances out, and allows for a better extraction.

However, it is important to remember that even a great filter can result in a poor cup of coffee, as the quality of the beans and extraction is still crucial.

This is where the magic happens, and it's what makes an espresso really taste good. The grouphead (also known as the brewhead) is where you put the portafilter, which is the thingy that you put the grounds of coffee into when making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to create steam, which then pushes the hot water through the grounds at a high pressure. These kinds of machines are usually less expensive and easier to maintain than pumps-driven models. They are however limited to create the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

In recent years, espresso machines driven by compressed air-pump have become increasingly popular. They use an air compressor to force hot water through the grounds and are more portable than electric steam-driven machines.