• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

How Does Machine Espresso Work?

Machine espresso employs precise pressure and incredible filter technology to produce the perfect cup of coffee. What exactly does it work?

Espresso is made by pushing hot water at high 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

As the name suggests, the group head is the place you place your portafilter when brewing espresso. It is responsible for dispersing the water into the portafilter and controlling the pressure that results from the extraction. There are many different types of group heads each with its own advantages and disadvantages. Some are designed for the stability of temperature while some are specifically designed to handle pre-infusion. Others are built to control the lever. There are even some that have a combination of features, such as the E61, which is considered the most popular choice among baristas due to its capacity to provide multiple benefits in a single package.

As you can see from the picture above the head of the group is equipped with several notches. The portafilter is placed in these notches and then twist the head to secure it. There is also a gasket made of rubber that resides inside the notches, which helps create an airtight seal when you insert your portafilter into the machine. The notches permit precise placement of your portafilter. This is vital for an efficient extraction.

In addition to allowing you to easily insert your portafilter, the group head is responsible to maintain an even temperature. It does this by circulating hot water through the brew container and around the portafilter to ensure that it is always at the correct temperature to extract. This is vital, because just a few degrees could be the difference between a excellent and great espresso.

The Pump

In contrast to manual piston machines that use a lever to pressurize water, rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure necessary for espresso extraction. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

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

Certain espresso machines do away with the pump completely and instead use steam pressure to brew commercial espresso machine. This could lead to over-extraction since the boiler that produces steam also causes the water to boil. These machines also have to constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines make use of an rotary or a vibration pump. A vibration model makes use of a vibrating disk to generate pressure, whereas the Rotary model pushes hot coffee through the ground at a high speed. Both types of machine are capable of producing excellent espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the one that heats the water to the right temperature for extraction. The resulting steam reaches the portafilter, which contains ground espresso beans and is then pumped down into the cup. During this process, steam causes pressure to push through the coffee grounds. This results in a crema on top of the espresso. This is one of the hallmarks of a good espresso.

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

The first Cheap Espresso machine machines were steam-type. They used one boiler to create steam and brew, but the pressure they could produce was not very high - two bars of atmospheric pressure, at most. This led to the coffee tasting burnt and bitter. This is the reason Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.

The most common espresso maker is a semiautomatic machine with an electric pump. When people think of uk espresso machine machines, they envision these machines. Semi-automatic machines require you to grind and tamp your beans yourself, but the pump regulates the water flow and pressure. This is a great compromise between the human touch and mechanized quality.

The Filter

Espresso machines usually use a filter that separates the grounds of the coffee from hot water. The filter is also an important part of the temperature control system, because it stops the machine from overheating.

It also improves flavor, since a filter allows for a more prolonged bloom time. This allows the beans to release their flavors, and improves extraction.

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

It's in this area that the magic occurs. This is what makes espresso taste so good. The grouphead, often called the brew head, is the place where the portafilter (the device you put the coffee grounds into) is located when you're making espresso.

In the steam-driven espresso machine hot water is heated in an airtight container to produce steam, which then pushes the hot water through the grounds at high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. However, they are limited in their ability to provide the ideal conditions for brewing since they operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bar.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They use an air compressor to force hot water into the grounds and are significantly more portable than steam-driven electric machines.