The Biggest Problem With Machine Espresso, And How You Can Solve It > 자유게시판

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How Does Machine Espresso Work?

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

To make espresso hot water is pushed under 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

As the name implies the group head is where you insert your portafilter when making espresso. It is responsible for dispersing water into the portafilter and then controlling the pressure of the extraction. There are several different types of group head each with its own advantages and drawbacks. Some focus on temperature stability, others on pre-infusion capabilities, and still others are designed to control the lever. Some have a combination, such as the E61. This is a popular choice among baristas due to the fact that it has multiple advantages in a single package.

As you can see in the above image The group head features many notches in which you can put your portafilter, then twist it with your hands to secure it. A gasket of rubber is situated inside the notches, which helps create a seal as you insert your portafilter. The notches on the head allow for an exact positioning of the portafilter which is vital for an efficient extraction.

Aside from allowing you to easily place your portafilter in, the group head is responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter and through the brew-basket, making sure that the temperature is always at the right level for extraction. It is important to remember that even a slight difference can make the difference between a great and a great espresso.

The Pump

Contrary to manual piston machines that use a lever to pressurize water, rotating espresso machines rely upon motorized pumps to supply the nine atmospheric bars of pressure that are required for espresso extraction. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven models, espressomachines and they tend to last longer, however both types of machines espresso machines may get damaged through overuse and lack of cleaning. They also make mechanically complex, Espressomachines which can result in a high price tag on even the most basic models.

Some espresso machines make use of steam pressure instead of a pump in order to brew espresso. This could lead to over-extraction since the boiler that makes steam also heats the water until it comes to a boil. The machines also need to continuously rebuild their pressure between cups. This requires energy and time.

Many espresso machines utilize a vibration or rotary pump, with a vibration model using a rotating disc that generates the pressure and an rotary model that pushes hot water through the grounds under high speed. Both machines produce great espresso, but rotary machines are quieter, more durable and less likely to break.

The Boiler

The boiler makes the water warm to the perfect temperature to extract. The steam that is created gets to the portafilter which holds the espresso grounds. The steam is then channeled into the cup. The steam generates enough pressure to push the grounds of coffee through. This produces a layer of crema that is then poured over. This is a sign of a good espresso.

There are three kinds of espresso makers, and they differ in the kind of pump they use and how hot the brew is. There are different ways that the brew can be controlled as well as the size of the cup that the maker can create.

The first espresso machines were steam-type. The earliest espresso machines were steam types. This led to the coffee tasting bitter and burnt. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semi-automatic one with an electric pump. These are the images people have when they think of an espresso machine. If you have a semi-automatic machine you have to grind the beans and tamp them by hand. The pump provides regulated water flow and pressure. This is an excellent compromise between human control and mechanised reliability.

The Filter

Typically, espresso machines utilize filters to separate the grounds of the coffee as they go through the hot water. The filter is also a vital component of the temperature control system, since it helps prevent the machine from overheating.

It also aids in flavor, since a filter allows for a longer bloom phase. This allows the beans to release their nuances, and also allows for better extraction.

However it is crucial to remember that even a good filter can result in a poor cup of coffee, since the quality of the beans and extraction are essential.

It's here that the magic takes place. This is the reason why espresso tastes so delicious. The grouphead (also known as the brewhead) is where you put the portafilter, the thingy that you put the grounds of coffee and espresso maker into when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight tank to create steam. Steam is then pushed through the grounds at a high pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the perfect conditions for espressomachines brewing, because they operate at 1-1.5 bars of pressure. While the perfect shot requires 9 bar espresso machine-10 bars.

In recent years, espresso machines driven by compressed air-pump are becoming increasingly popular. They use an air-compressor to force hot water into the best ground coffee for espresso machine. They are also more mobile than electric steam-driven espresso machines.