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

How Does Machine Espresso Work?

Machine espresso uses precision pressure and incredible filter technology to produce the coffee we love. How exactly does it work?

To make espresso hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, but the major difference is in the pressure.

The Group Head

The group head is the portafilter you put in when making espresso. It distributes water into the portafilter and regulates the pressure during the extraction. There are various kinds of group head each with its own advantages and drawbacks. Some are specifically designed for stability of temperature while others are designed to handle pre-infusion. Some are designed to control the lever. Some have a combination of features, like the E61 that is the standard choice for many baristas due to its capacity to offer multiple perks in one package.

As you can see in the above image the group head comes with several notches where you place your portafilter and twist it manually to secure it. A gasket made of rubber is positioned in the notches to create a seal while you insert your portafilter. The notches on the head permit a precise position of the portafilter which is crucial for a consistent extraction.

The group head not only allows you to put in your portafilter easily, but it also maintains a constant temperature. It does this by cycling hot water through the brew basket and around the portafilter, making sure that it's always at the correct temperature to extract. This is crucial, since even a small difference in temperature can be the difference between a good and great espresso.

The Pump

The motorized pumps that are used in espresso machines rotary provide nine atmospheric bar pressure required for espresso extraction. This is different from manual piston machines that use levers. This pressure is built up by pumping water through a heat exchanger and then through the ground coffee espresso machines.

Pumps tend to be cheaper than piston-driven machines, and tend to last longer. However, both types of machines may degrade with overuse and insufficient cleaning. They also increase the complexity of mechanical systems, which can result in the cost of even the simplest models.

Some espresso machines employ steam pressure instead of a pump to make espresso. This can cause over-extraction because the boiler that makes steam also heats the water to boil. These machines also have to continually rebuild their pressure between cups. This takes energy and time.

Many home espresso machine machines use either a vibration or rotary pump. A vibration model makes use of the vibrating disk to create pressure, whereas the Rotary model pushes hot coffee through the ground at a high speed. Both models can make a great espresso coffee makers, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is what will heat the water to the right temperature for extraction. The steam that is produced reaches the portafilter that contains the ground espresso coffee and is then funneled down into the cup. The steam creates pressure and pushes through the grounds of the coffee. This results in a whipped-up the top of the espresso. This is one of the hallmarks of a great espresso.

There are three kinds of espresso makers, which differ in the type of pump they employ and the degree of heat that the espresso is. There are various ways that the brew may be controlled, as well as the dimensions of the cup the machine can produce.

The first espresso machines were steam types. The first espresso machines were steam-type machines. The coffee tasted bitter and burnt. This is the reason why Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most commonly used Retro Espresso maker machine is a semiautomatic one with an electric pump. These are the things people think of when they imagine an espresso machine. With a semi-automatic machine you need to grind the beans and tamp them by hand. The pump is able to regulate the flow of water and pressure. This is an excellent compromise between human touch and the mechanised quality.

The Filter

Typically, espresso machines employ a filter to separate out the grounds of coffee when they pass through the hot water. The filter is also an essential part of the machine's temperature control, since it helps to prevent overheating.

A filter can also help with flavor, as it permits an extended flowering time. This lets the beans release their flavor and improves extraction.

It is important to keep in mind that even the best filter can make a bad cup of coffee. The quality of the beans, as well as the extraction, are still very important.

This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead (also called the brewhead) is where you place the portafilter, the thingy used to place the grounds of your coffee into when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. This is then pushed through the grounds under high pressure. These kinds of machines are typically less expensive and easier to maintain than pumps-driven models. However, they are limited in their ability to create the ideal conditions for brewing since they are only operating at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar.

In recent years, compressed air-pump-driven espresso machines have become more popular. They utilize an air compressor to push hot water across the ground and are more mobile than steam-driven electric espresso machines.