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

How Does Machine Espresso Work?

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

To make espresso maker barista, hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee, however the main difference lies in the pressure.

The Group Head

The group head is the portafilter that you place in the espresso maker when making it. It is responsible for dispersing water into the portafilter and controlling the pressure of the resulting extraction. There are many different kinds of group heads, each with their unique advantages and disadvantages. Some are focused on temperature stability, whereas others on pre-infusion features, and others are designed to control the lever. Some have a combination, like the E61. This is a very popular choice for baristas due to the fact that it has multiple benefits in a single package.

As you can see in the above image the group head comes with several notches to put your portafilter, then twist it by hand to lock it in. There is also a gasket made from rubber in the notches to help create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise positioning of the portafilter which is vital for a consistent extraction.

The group head is not just able to allow you to place your portafilter easily but also maintains an even temperature. It does this by cycling hot water through the brew container and around the portafilter to ensure that it's always at the correct temperature to extract. It is important to note that even a few degree deviation can make the difference between a decent and a excellent espresso.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever to pressurize water, Rotary espresso machines rely on motorized pumps that provide the nine atmospheric bars of pressure needed to extract espresso. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.

Pumps are generally more affordable and last longer than piston-driven machines. However, both kinds of machines are susceptible to degrading due to overuse and insufficient cleaning. They also create mechanical complexity, which can result in the cost of even the simplest models.

Some espresso machines employ steam pressure instead of a pump for brewing espresso. This can cause over-extraction because the boiler that makes steam also heats the water until it comes to a boil. Additionally these machines typically have to rebuild their pressure between cups, which takes time and energy.

Many espresso machines make use of the rotary or vibration pump. A vibration model utilizes the vibrating disk to create pressure, while a rotating model pushes hot water through the ground at a fast speed. Both types of machine can make excellent espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the one that will heat the water to the right temperature to extract. The resulting steam reaches the portafilter that contains ground espresso beans and is then pumped down into the cup. During this process the steam is able to create enough pressure to push the grounds of the coffee through. This creates a foam on the top of the espresso. This is one of the main characteristics of a good espresso.

There are three types of espresso makers. They differ in the type of pump they use and the degree of heat that the espresso is. There are different ways in which the brew can be controlled and the dimensions of the cup the machine is capable of making.

The first espresso machines were steam-based. They had one boiler to make steam and brew, but the pressure they could produce was very low - just two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso machine is a semiautomatic one with an electric pump. When people think of espresso machines, they envision these machines. Semi-automatic machines require you to grind and tamp the beans on your own while the pump controls the water flow and pressure. This is a great compromise between the human touch and the mechanised consistency.

The Filter

Espresso machines usually have a filter that separates the grounds of the coffee from the hot water. The filter is also an essential component of the machine's temperature control, since it stops overheating.

Filters also aid in flavor as it allows for a longer flowering period. This allows the beans to let their nuances out and provides an opportunity for quality espresso machine - thesocialroi.com - a better extraction.

It is important to remember that even the best filter can result in a bad cup of coffee. The quality of the beans, and the extraction process, are still crucial.

It's here that the magic takes place. This is the reason why espresso tastes so good. The grouphead, often called the brewhead, is where the portafilter (the thing you put the ground coffee into) sits when you're making espresso.

In a steam-driven italian espresso machine machine, hot water is heated in an airtight container to create steam. This is then pushed through the grounds at a high pressure. These kinds of machines are generally less expensive and easier to maintain than pump-driven models. They are however limited to create the perfect brewing conditions as they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars.

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