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

How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and filtering technology that is amazing to create the coffee you love. How exactly does it work?

espresso home machine is produced by pushing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee but the difference is in the pressure.

The Group Head

The group head is the portafilter that you put in when making espresso. It is responsible for dispersing the water into the portafilter and then controlling the pressure of the resulting extraction. There are a variety of group heads each with their own advantages and disadvantages. Some are designed to provide stability in temperature, while others are designed to handle pre-infusion. Some are designed to control the lever. Some contain a variety of features, like the E61, which is considered the standard choice for many baristas because of its ability to offer multiple benefits in one package.

As you can see in the image above the group head is made up of several notches where you put your portafilter, then twist it manually to lock it in. There is also a gasket of rubber in the notches to help create a seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is crucial for an efficient extraction.

The group head not only allows the portafilter to be inserted easily however, it also keeps an even temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket to ensure that the temperature is constant for extraction. It is important to realize that even a tiny variation can mean the difference between a good and a great espresso.

The Pump

Motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure that is required to extract espresso. This differs from manual piston machines which use levers. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are generally less expensive and last longer than piston-driven machines. However, both kinds of machines are susceptible to degrading due to excessive use and poor cleaning. They also add mechanical complexity which can result in the cost of even the most basic models.

Certain espresso machines eliminate the pump completely and employ steam pressure to create espresso. This can lead to over-extraction as the boiler that makes steam also warms the water to boil. The machines must also constantly rebuild their pressure between cups. This takes energy and time.

Many pro espresso machine machines make use of an rotary or vibrating pump, which is a vibration model using a vibrating disc that generates the pressure, and a rotary model pushing hot water through the grounds at high speed. Both models can produce an excellent espresso, however rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler heats the water to the right temperature for extraction. The resulting steam reaches the portafilter containing ground espresso beans and gets funnelled down into the cup. During this process, steam creates pressure and pushes through the coffee grounds. This creates a foam on top of the espresso. This is one of the main characteristics of a great espresso.

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

The earliest buy espresso machine machines were steam-based. They had one boiler to create both brew and steam, but the pressure they could create was minimal - two bars of atmospheric pressure maximum. The coffee for espresso machine (7prbookmarks.Com) tasted bitter and burnt. This is the reason why Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most commonly used espresso maker is a semi-automatic device that has an electric pump. When people think of espresso machines, they envision these machines. With a semi-automatic machine you must grind the beans and then tamp them yourself but the pump is able to regulate the flow of water and pressure. This is a great combination of human control and mechanized reliability.

The Filter

Espresso machines typically use filters that separate the grounds of the coffee from the hot water. The filter is also a vital component of the machine's temperature control, as it helps prevent overheating.

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

However, it is important to keep in mind that even a high-quality filter can result in a poor cup of coffee, since the quality of the beans and extraction is crucial.

This is where the magic happens, it's the thing that makes an espresso really taste good. The grouphead, often called the brewhead, is where the portafilter (the thing you put the ground coffee into) sits when you're making espresso.

Steam-driven espresso machines use hot water that is heated inside an airtight container to produce steam. The steam then pushes hot water into the coffee grounds under high pressure. They are less expensive and easier for the user to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, espresso machines powered by a compressed air compressor have become increasingly popular. They use an air-compressor to push hot water through the ground and are more mobile than steam-driven electric espresso machines.