9 Things Your Parents Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How does it work exactly?

Espresso is created by forcing hot water under pressure through finely ground coffee. The process is similar to making drip coffee but the difference is in the pressure.

The Group Head

As the name implies, the group head is the place you put your portafilter in when making espresso. It distributes water into the portafilter, and then regulates the pressure of extraction. There are a variety of group heads each with its own advantages and drawbacks. Some are designed for temperature stability while others are specifically designed to handle pre-infusion. Others are made to control the lever. There are some that include a mix of features, like the E61 that is to be the most popular among baristas due to its ability to provide multiple benefits in a single package.

As you can see in the image above the group head is fitted with several notches. You can place your portafilter inside these notches, and then twist the head to secure it. A rubber gasket is located inside the notches, which helps create a seal as you insert your portafilter. The notches on the head permit a precise location of the portafilter which is vital to ensure a consistent extraction.

In addition to allowing you to easily insert your portafilter, the group head is also responsible to maintain an even temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket to ensure the temperature is always right for extraction. This is important, as just a few degrees could be the difference between a good and excellent espresso.

The Pump

The motorized pumps used in espresso machines that rotate provide the nine atmospheric bars of pressure required to extract espresso. This is different from manual piston machines that use a lever. The pressure is created 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 types of machines can deteriorate due to overuse and inadequate cleaning. Pumps are also more complex mechanically, which can increase the cost of even the most basic models.

Some espresso machines employ steam pressure instead of a pump to brew espresso. The downside is that the boiler that produces steam also increases the temperature of the water to boiling and can result in over-extraction. The machines must also continually rebuild their pressure between cups. This takes energy and time.

Many buy espresso makers machines use an rotary or a vibration pump. A vibration model uses the vibrating disk to create pressure, while the rotating model pushes hot water through the ground at a rapid speed. Both types of machines can make excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part which heats the water to the optimal temperature for extraction. The steam that is produced reaches the portafilter which holds the ground espresso machine with milk frother coffee, and is then pumped into the cup. During this process, steam causes pressure to push through the grounds of the coffee. This produces a layer of crema that is then poured over. This is a sign of a great espresso.

There are three types of espresso machines, each with distinct pumps and the temperature of the brew. There are various ways that the brew can be controlled as well as the size of the cup the machine can make.

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

The most commonly used espresso maker is a semi-automatic one that has an electric pump. When people think of espresso machines, they imagine these machines. If you have a semi-automatic machine you grind the beans and then tamp them by hand. The pump is able to regulate the flow of water and pressure. This is a fantastic solution that combines human control with mechanized reliability.

The Filter

Espresso machines typically have a filter that separates the grounds of the coffee from the hot water. The filter is also a vital component of the machine's temperature control, since it helps to prevent overheating.

Filters also aid in flavor since it allows for a longer flowering period. This lets the beans release their flavors, and improves extraction.

It is important to keep in mind that even the best espresso machine uk filter could result in a poor cup of coffee. The quality of the beans, as well as the extraction, are still very important.

It's here that the magic happens. This is what makes espresso taste so delicious. The grouphead (also known as the brewhead) is where you place 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 high pressure. These machines are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited to create the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, compressed air-driven espresso machines have become more popular. They use an air compressor to push hot water through the grounds, and are far more portable than steam-driven electric machines.