13 Things You Should Know About Machine Espresso That You Might Never Have Known > 자유게시판

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How Does Machine Espresso Work?

Machine espresso makes use of precise pressure and mind-blowing filter technology to make the coffee we love. But how exactly does it work?

Espresso is made by pushing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee. However the pressure is the major difference.

The Head of the Group

As the name implies, the group head is where you place your portafilter when making espresso. It disperses water into the portafilter, and regulates the pressure of the extraction. There are a variety of group heads, each with its own advantages and drawbacks. Some are designed to provide temperature stability while others are designed to handle pre-infusion. Others are made to control the lever. Some come with a combination of both, such as the E61. This is a popular choice among baristas as it provides a variety of benefits in one package.

As you can see in the image above the group head is fitted with a variety of notches. You place your portafilter in these notches and then twist the head to lock it. A gasket made of rubber is placed within the notches to make a seal when you insert your portafilter. The notches allow for an exact placement of the portafilter. This is crucial for an efficient extraction.

The group head does not just allow you to place your portafilter easily but also maintains an even temperature. This is done by cycling hot water around the portafilter and through the brew basin, ensuring that the temperature is constant to extract the coffee. It is crucial to keep in mind that even a few degree deviation can make the difference between a great and a excellent espresso.

The Pump

The motorized pumps used in espresso machines that rotate provide the nine atmospheric bar pressure that is required for espresso extraction. This differs from manually operated piston machines that employ a lever. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are generally 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 add mechanical complexity, which can result in the cost of even the simplest models.

Some espresso machines remove the pump completely and instead use steam pressure to brew italian espresso machines. This can cause over-extraction because the boiler that produces steam also causes the water to boil. The machines also need to constantly rebuild their pressure in between cups. This takes energy and time.

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

The Boiler

The boiler is the part that heats the water to the ideal temperature for extraction. The resulting steam is then transferred to the portafilter that contains ground espresso coffee maker beans and is then funneled down into the cup. In this process, the steam creates pressure to push through the coffee grounds. This results in a layer of crema on top espresso machines. This is a sign of a good espresso.

There are three kinds of espresso makers, and they differ in the kind of pump they use and how hot the espresso is. There are many ways to control the brew and the size of cup that can be produced by the machine.

The first espresso machines were steam-type. They utilized only one boiler to make steam and brew, however the pressure they were able to create was minimal - two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. This is the reason why Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most well-known espresso machine is a semiautomatic with an electric pump. This is what people envision when they think of an espresso maker. With a semi-automatic machine, you grind the beans and tamp them by hand. The pump controls the flow of water and pressure. This is an excellent solution that combines human control with mechanised reliability.

The Filter

Typically, espresso machines utilize filters to separate the grounds of coffee machine espresso when they pass through the hot water. The filter is also a crucial component of the temperature control system since it helps prevent the machine from overheating.

It also improves flavor, as it lets you enjoy a longer bloom phase. This helps the beans to release their flavors and provides the chance for better extraction.

It is important to keep in mind that even the most efficient filter can result in a bad cup of coffee. The quality of the beans as well as the extraction, are still crucial.

It's in this area that the magic takes place. This is the reason why espresso tastes so delicious. The grouphead (also known as the brewhead) is where you place the portafilter, the thingy which you put the grounds of coffee into when making espresso.

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

In recent years, compressed air-driven espresso machines have been gaining popularity. They use an air compressor to force the hot water through the grounds and espresso makers are significantly more portable than electric steam-driven machines.