13 Things You Should Know About Machine Espresso That You Might Not Have Known > 자유게시판

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How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and incredible filter technology to produce the delicious coffee for espresso machine we enjoy. How 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. However the pressure is the primary difference.

The Group Head

The group head is the portafilter that is inserted when you are making espresso. It disperses water in the portafilter and regulates the pressure during the extraction. There are numerous kinds of group heads, each with its own advantages and drawbacks. Some are specifically designed for stability of temperature while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some include a combination such as the E61. This is a favorite among baristas since it provides multiple advantages in a single package.

As you can see in the above photo the group head is fitted with several notches. It is possible to place your portafilter in these notches, then twist the head to secure it. There is also a gasket of rubber that is a part of the notches to help create the seal when you insert your portafilter into the machine. The notches on the head allow for an exact location of the portafilter which is essential to ensure an even extraction.

Aside from allowing you to easily place your portafilter in, the group head is responsible to maintain an even temperature. It does this by circulating hot water through the brew container and around the portafilter, ensuring that it's always at the correct temperature to extract. It is important to remember that even a few degree differences can make the distinction between a great and a excellent 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 required for espresso extraction. 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 models, and they tend to last longer, but both types of machines could be damaged by excessive use and inadequate cleaning. They also increase the complexity of mechanical systems which can result in a high price tag on even the most basic models.

Certain travel espresso maker machines can eliminate the pump completely and utilize steam pressure to make espresso. The drawback is that the same dual boiler espresso machine that produces steam also increases the temperature of the water to the point of boiling which can cause excessive extraction. In addition, these machines frequently have to restore their pressure between cups, which requires time and energy.

Many espresso machines employ either a rotary or vibration pump, with a vibrating model using a vibrating disc that generates the pressure and the rotary model pushing hot water through the grounds under high speed. Both machines can make great espresso however rotary machines tend to be more quiet, durable and less likely to fail.

The Boiler

The boiler is what heats the water to the right temperature to extract. The resulting steam is then transferred to the portafilter which holds the ground espresso and compact espresso Machine is then pumped down into the cup. During this process the steam generates enough pressure to push the grounds of coffee through. This creates a foam on the top of the espresso. This is one of the main characteristics of a good espresso.

There are three types of espresso makers. They differ in the type of pump they employ and the degree of heat that the coffee is. There are different ways in which the brew can be controlled and the size of the cup that the machine can produce.

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

The most common espresso maker is a semi-automatic machine with an electric pump. When people think of Compact espresso Machine machines, they envision these machines. If you have a semi-automatic machine you have to grind the beans and tamp them by hand, but the pump controls the flow of water and pressure. This is an excellent compromise between human control and mechanised consistency.

The Filter

Typically, espresso capsule machine machines have filters that separate the coffee grounds as they pass through the hot water. The filter is also an essential component of the temperature control system, as it keeps the machine from overheating.

It also aids in flavor as a filter allows for a more prolonged bloom time. This lets the beans release their nuances, and improves extraction.

It is important to keep in mind that even the best coffee espresso machine filter can make a bad cup of coffee. The quality of the beans, and the extraction process remain crucial.

This is where the magic happens, it's the thing that makes espresso taste good. The grouphead, sometimes called the brew head, is the place where the portafilter (the device you put the ground coffee into) is placed when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight container to create steam, which is then pushed through the grounds at a high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. However, they are limited in their capacity to create the ideal brewing conditions, since 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 much more mobile than electric steam-driven espresso machines.