It's Enough! 15 Things About Machine Espresso We're Sick Of Hearing > 자유게시판

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How Does Machine Espresso Work?

The machine espresso uses precision pressure, and a filtering technology that is amazing to make the coffee you enjoy. What exactly is it that makes it work?

Espresso is created by forcing hot water 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 the place you insert your portafilter when making espresso. It distributes water into the portafilter, and then controls the pressure of the extraction. There are a variety of types of group heads each with its unique advantages and drawbacks. Some focus on temperature stability, some on pre-infusion features, and others are designed to control the lever. Some include a mix of features, like the E61, which is the standard choice for many baristas because of its ability bean to cup espresso machine offer multiple benefits in one package.

As you can see in the image above, the group head is equipped with several notches. You can place your portafilter in these notches, then twist the head to secure it. A rubber gasket is located inside the notches, which helps create a seal while you insert your portafilter. The notches on the head allow for an exact positioning of the portafilter which is vital for an efficient extraction.

The group head not only lets you to place your portafilter easily however, it also keeps a constant temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket, making sure that the temperature is constant to extract the coffee. This is crucial, since just a few degrees could make the difference between a good and excellent espresso.

The Pump

The motorized pumps that are used in rotary espresso machines provide the nine atmospheric bars of pressure required for espresso extraction. This is different from manually operated piston machines that employ a lever. This pressure is generated by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven machines, and tend to last longer, but both types of machine can become damaged due to excessive use and poor cleaning. They also create mechanical complexity that can lead to costly prices for even the most basic models.

Certain espresso machines do away with the pump completely and employ steam pressure to create espresso. This can cause over-extraction because the boiler that produces steam also heats the water until it comes to a boil. They also have to continuously rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of either a rotary or vibration pump, with a vibrating model that uses a vibrating disc to create pressure and a rotary model pushing hot water through the grounds at high speed. Both machines produce great espresso but rotary machines are quieter, more durable and less likely to break down.

The Boiler

The boiler makes the water warm to the ideal temperature for extraction. The steam created will eventually reach the portafilter, which is a container for espresso grounds. It is then poured into the cup. The steam is able to create enough pressure to push the grounds of coffee through. This produces a layer of crema on top. This is one of the main characteristics of a good espresso.

There are three types of espresso makers, which differ in the kind of pump they use and how hot the espresso is. There are various 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 were steam type. The earliest cafe espresso machine (mypresspage.com) machines were steam types. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semi-automatic device that has an electric pump. These are the images people have when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans yourself, but the pump regulates the flow of water and pressure. This is a great compromise between the human touch and the mechanised quality.

The Filter

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

It also aids in flavor, as it allows for a longer bloom time. This helps the beans release their flavors and provides an opportunity for better extraction.

It is important to keep in mind that even the best espresso machine filter could result in a poor cup of coffee. The quality of the beans and the extraction process, remain vital.

It's here that the magic happens. This is the reason why espresso tastes so delicious. The grouphead, often called the brew head, is where the portafilter (the container you place the coffee grounds into) is placed when you're making espresso.

Steam-driven espresso machines use hot water that is heated in an airtight vessel to create steam. The steam then pushes hot water into the grounds of the coffee under pressure. These kinds of machines are generally cheaper and easier to maintain than pumps-driven models. They are however limited in their ability to create the ideal brewing conditions as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

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