10 Quick Tips About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and mind-blowing filter technology to make the perfect cup of coffee. How exactly does it work?

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

The Head of the Group

The name implies the group head is the place you place your portafilter while making espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure of the extraction. There are various kinds of group heads each with its own advantages and drawbacks. Some are specifically designed for temperature stability while others are built to handle pre-infusion. Some 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 image above the group head comes with several notches where you place your portafilter and then twist it manually to secure it. A gasket made of rubber is placed in the notches to create a seal while you insert your portafilter. The notches allow for the precise placement of the portafilter. This is crucial to ensure an efficient extraction.

Aside from allowing you to easily place your portafilter in, the group head is also responsible for maintaining an even temperature. It does this by cycling hot water through the brew basket and around the portafilter to ensure that it is always at the right temperature to extract. It is important to note that even a few degree differences can make the distinction between a decent and a great best budget espresso machine.

The Pump

In contrast to manual piston machines which rely on a lever that pressurize water, rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure needed for espresso extraction. 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 are susceptible to degrading because of frequent use and insufficient cleaning. Pumps are also more complex mechanically, which can increase the price of even the most basic models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The downside is that the boiler that produces steam also raises the temperature of water to boiling which could lead to over-extraction. These machines also have to continually rebuild their pressure between cups. This takes energy and time.

A majority of espresso machines use an rotary or vibrating pump, with a vibration model using a rotating disc to create pressure and a rotary model pushing hot water through the grounds at high speed. Both types of machine can produce an excellent espresso, however Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the one that makes the water warm to the perfect temperature to extract. The steam created reaches the portafilter, which holds the espresso grounds. It is then pumped into the cup. The steam creates pressure that pushes through the grounds of the coffee. This results in a layer of crema on top. This is one of the hallmarks of a great espresso.

There are three kinds of espresso makers, and they differ in the type of pump they employ and how hot the espresso is. There are different ways to control the strength of the brew and the size of the cup that can be made by the machine.

The earliest espresso machines were steam type. They used a single boiler to make both brew and steam, but the pressure they could create was minimal - two bars of atmospheric pressure maximum. The coffee tasted bitter and burned. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni created the modern retro small espresso machine maker (http://www.Xiaodingdong.store) machine.

The most well-known espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic espresso machine, you must grind the beans and tamp them yourself but the pump regulates the flow of water and pressure. This is a perfect compromise between human control and mechanised accuracy.

The Filter

Espresso machines typically have filters that separate the coffee grounds from the hot water. The filter is also an essential part of the temperature control system as it prevents the machine from overheating.

It also enhances flavor, as a filter allows for a longer bloom time. This lets the beans release their flavor and improves extraction.

However, it is important to keep in mind that even a good filter can produce a bad cup of coffee, because the quality of the beans and extraction are essential.

It's in this area that the magic happens. This is what makes espresso taste so good. The grouphead (also known as the brewhead) is where you place the portafilter, the device used to place the grounds of your coffee into when making best espresso maker.

Steam-driven espresso machines use hot water heated in an airtight container to make steam. The steam then moves hot water through the grounds of coffee under high pressure. These machines are cheaper and are easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

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