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

How Does Machine Espresso Work?

The machine espresso machines for home 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 forced under high pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the primary difference.

The Head of the Group

The group head is the portafilter that is inserted when you are making espresso. It is responsible for dispersing the water into the portafilter before controlling the pressure of the extraction. There are a variety of types of group head each with its particular advantages and disadvantages. Some are designed to provide stability in temperature, while others are specifically designed to handle pre-infusion. Others are built to control the lever. Some come with a range of features, such as the E61 that is the classic choice among many baristas because of its ability to offer multiple benefits in a single package.

As you can see in the photo above the group head comes with many notches in which you can place your portafilter and twist it by hand to secure it. There is also a gasket of rubber that resides inside the notches and helps create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise position of the portafilter which is crucial for an even extraction.

Apart from allowing you easily place your portafilter in, the group head is also responsible for maintaining a consistent temperature. It does this by circulating hot water through the brew pan and around the portafilter, making sure that it is always at the correct temperature for extraction. It is crucial to keep in mind that even a tiny deviation can make the difference between a great and a great espresso.

The Pump

Unlike manual piston machines, that use a lever to pressurize water, the rotary espresso machines use motorized pumps to provide the nine atmospheric bars of pressure necessary to extract Mini espresso Machine. This pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger prior being pumped through the ground coffee inside the group head.

Pumps tend to be less expensive than piston-driven machines, and they tend to last longer, but both types of machines can become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, and can add to the price of even the most basic models.

Certain espresso machines eliminate the pump entirely and employ steam pressure to create espresso. The drawback is that the same boiler that produces steam also increases the temperature of water to boiling and can result in excessive extraction. Additionally these machines typically have to rebuild their pressure between cups, which takes time and energy.

Many espresso machines employ the rotary or vibration pump, which has a vibration model that uses a vibrating disc to create the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both models can produce an excellent espresso, however Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats water to the optimal temperature to extract. The steam that is produced reaches the portafilter containing ground espresso beans and is then pumped into the cup. In this process, the steam creates pressure to push through the coffee grounds. This results in a layer crema that is then poured over. This is one of the hallmarks of a good espresso.

There are three distinct types of small espresso machine machines, each with different pumps and the temperature of the brew. There are many ways to control the brew and the size of the cup that can be produced by the machine.

The first espresso machines were steam-type. They had only one boiler to make both brew and steam, but the pressure they could generate was low - only two bars of atmospheric pressure at the most. This led to the coffee tasting burnt and bitter. The modern espresso machine was developed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic model with an electric pump. This is what people envision when they think of an espresso maker. If you have a semi-automatic machine you grind the beans and then tamp them yourself but the pump controls the flow of water and pressure. This is a great compromise between human control and mechanised accuracy.

The Filter

Espresso machines usually use a filter that separates the grounds of coffee from hot water. The filter is also an important part of the temperature control system, as it keeps the machine from overheating.

It also helps with flavor, as it can allow for a longer bloom phase. This allows the beans to release their flavors and provides an opportunity for a better extraction.

It is important to remember that even the best filter can result in 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 an espresso really taste great. The grouphead, often referred to as the brew head, is the place where the portafilter (the thing you put the ground coffee into) is located when you're making espresso.

Steam-driven cheap espresso machine machines make use of hot water heated in an airtight container to make steam. The steam then pushes hot water into the grounds of coffee at high pressure. They are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9 bar espresso machine-10 bars.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They make use of an air compressor to force hot water through the ground and are more mobile than electric steam-driven espresso machines.