Nine Things That Your Parent Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and mind-blowing filter technology to create the perfect cup of coffee. How exactly does it work?

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

The Head of the Group

The group head is the portafilter that is inserted when you are making espresso machine sale. It is responsible for dispersing water into the portafilter, and controlling the pressure that results from the extraction. There are a variety of types of group heads each with its distinct advantages and disadvantages. Some are focused on temperature stability, while others on pre-infusion capabilities, and still others are designed to control the lever. Some have a combination, like the E61. This is a popular choice among baristas as it provides a variety of benefits in a single package.

As you can see in the above photo the head of the group is equipped with several notches. You place your portafilter into these notches and turn the head around to secure it. A rubber gasket is located inside the notches to help make a seal when you insert your portafilter. The notches on the head permit an exact position of the portafilter which is necessary for a consistent extraction.

The group head is not just able to allow you to insert your portafilter easily, but it also maintains the temperature at a constant level. It does this by cycling hot water through the brew basket and around the portafilter to ensure that it is always at the correct temperature for extraction. It is crucial to keep in mind that even a few degree deviation can make the difference between a good and great espresso.

The Pump

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

Pumps tend to be cheaper than piston-driven machines, and tend to last longer. However, both types of machines can get damaged through overuse and lack of cleaning. They also add mechanical complexity that can lead to costly prices for even the simplest models.

Some espresso machines remove the pump entirely and utilize steam pressure to make espresso. The drawback is that the same boiler that produces steam also increases the temperature of the water until it reaches boiling which can cause over-extraction. Additionally these machines typically have to rebuild their pressure between cups, which takes time and energy.

A majority of espresso machines use the rotary or vibration pump, with a vibration model that uses a vibrating disc that generates the pressure, and the rotary model pushing hot water through the grounds at high speed. Both models can make excellent espresso machines uk, but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the one that is used to heat the water to the perfect temperature to extract. The steam that is created is then directed to the portafilter, which holds the espresso grounds. The steam is then channeled into the cup. During this process, steam creates pressure and pushes through the coffee grounds. This produces a layer of crema on top. This is a hallmark of a good espresso.

There are three kinds of espresso makers, which differ in the kind of pump they use and how hot the brew is. There are a variety of ways that the brew may be controlled, as well as the dimensions of the cup the machine is capable of making.

The first espresso machines home machines were steam type. The earliest espresso machines were steam types. This led to the coffee tasting burnt and bitter. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso coffee maker machine.

The most well-known espresso maker is a semi-automatic device with 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 by hand, but the pump controls the flow of water and pressure. This is a fantastic compromise between human control and mechanised reliability.

The Filter

Typically, espresso machines have filters to separate the grounds of the coffee as they go through the hot water. The filter is also a vital element of the temperature control system as it keeps the machine from overheating.

A filter also helps with flavor because it allows for the beans to flower for a longer period of time. This helps the beans release their flavors and provides an opportunity to improve extraction.

It is important to remember that even the finest filter can result in a bad cup of coffee. The quality espresso machine of the beans and the extraction, are still crucial.

This is where the magic happens, it's the thing that makes an espresso really taste good. The grouphead (also known as the brewhead) is where you put the portafilter, the device which you put the grounds of coffee into when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight container to produce steam, which is then pushed through the grounds at a high pressure. These kinds of machines are usually less expensive and easier to maintain than pump-driven models. However, they are limited in their ability to produce the perfect brewing conditions because they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar.

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