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

How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and incredible filter technology to produce the perfect cup of coffee. What exactly does it work?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Head of the Group

The group head is the portafilter that you put in when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure that results from the extraction. There are numerous kinds of group heads each with its own advantages and drawbacks. Some are focused on temperature stability, others on pre-infusion options, and others are designed to control the lever. Some have a combination, like the E61. This is a preferred choice for baristas due to the fact that it has multiple benefits in a single package.

As you can see in the above image The group head features several notches where you put your portafilter, then twist it with your hands to secure it. There is also a rubber gasket that resides inside the notches to help create a seal when you insert your portafilter into the machine. The notches allow for an exact placement of the portafilter. This is vital for an efficient extraction.

Aside from allowing you to easily insert your portafilter, the group head is responsible for maintaining a consistent temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is at the right level to extract the coffee. This is vital, because just a few degrees could make the difference between a excellent and great espresso.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever that pressurize water, rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure necessary to extract espresso. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be cheaper and last longer than piston-driven machines. However, both kinds of machines can degrade due to overuse and poor cleaning. They also create mechanical complexity and can lead to a high price tag on even the simplest models.

Certain espresso machines can eliminate the pump completely and make use of steam pressure to make espresso. The downside is that the same boiler that produces steam also raises the temperature of water until it reaches boiling and can result in excessive extraction. These machines also have to continually rebuild their pressure between cups. This takes energy and time.

Many espresso machines utilize the rotary or vibration pump, which is a vibration model using a rotating disc that generates the pressure, and a rotary model pushing hot water through the grounds under high speed. Both machines can produce excellent espresso, however rotary machines are more stable, quieter and less likely to break.

The Boiler

The boiler is the element that heats water to an ideal temperature to extract. The steam produced reaches the portafilter, which is the container that holds the decent espresso machine coffee grounds. It is then funneled into the cup. During this process, the steam creates 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 types of espresso makers, and they differ in the type of pump they use and how hot the brew is. There are a variety of ways to control the strength of the brew and the size of the cup that can be made by the machine.

The first espresso machines were steam-types. They employed one boiler to make both steam and brew but the pressure they could generate was low - only two bars of atmospheric pressure maximum. The coffee tasted bitter and burned. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso maker is a semi-automatic one with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans yourself The pump, however, regulates the water flow and pressure. This is an excellent compromise between human control and mechanised accuracy.

The Filter

Typically, espresso machines utilize filters bean to cup espresso machines separate the grounds of the coffee as they go through the hot water. The filter is also an essential element of the machine's temperature control, since it helps to prevent overheating.

It also improves flavor, as it allows for a longer bloom phase. This allows the beans to let their nuances out, and also allows for better extraction.

However, it is important to remember that even a good filter could result in a bad cup of coffee and espresso maker, since the quality of the beans and extraction are crucial.

It's here that the magic takes place. This is the reason why espresso Machine black friday (telegra.ph) tastes so good. The grouphead, also referred to as the brew head, is the place where the portafilter (the thing you put the coffee grounds into) is located when you're making espresso.

In a steam-driven espresso machine hot water is heated in an airtight container to produce steam, which then pushes the hot water through the grounds at a high pressure. They are less expensive and are easier for the user to maintain than pumps-driven models. However, they are limited in their capacity to create the ideal brewing conditions, because they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bars.

In recent years, compressed air-driven espresso machines have become more popular. They use an air compressor to force hot water through the ground, and are more mobile than electric steam-driven espresso home machine machines.