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

How Does Machine Espresso Work?

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

To make an espresso, hot water is pushed under pressure through finely ground coffee. The process is similar to that of making drip coffee. However, the pressure is the main difference.

The Head of the Group

The group head is the portafilter you place in the espresso maker when making it. It is responsible for dispersing water into the portafilter before controlling the pressure of the resulting extraction. There are many different types of group heads each with distinct advantages and disadvantages. Some are designed to provide the stability of temperature while some are designed to handle pre-infusion. Some are designed to control the lever. There are some that contain a variety of features, like the E61, which is the most popular choice among baristas due to its ability to offer multiple perks in a single package.

As you can see from the photo above the head of the group is fitted with a variety of notches. You can place your portafilter in these notches and then twist the head to lock it. A gasket made of rubber is placed inside the notches, which helps create a seal while you insert your portafilter. The notches on the head allow for an exact placement of the portafilter, which is crucial to ensure an even extraction.

The group head not only allows you to place your portafilter easily however, it also keeps a constant temperature. It does this by circulating hot water through the brew basket, and around the portafilter, ensuring that it is always at the correct temperature for extraction. It is important to realize that even a tiny variation can mean the difference between a decent and a excellent espresso.

The Pump

Unlike manual piston machines, that use a lever to pressurize water, rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure that are required to extract espresso. The pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger prior it is shot through the ground coffee in the group head.

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

Some espresso machines make use of steam pressure instead of a pump to brew espresso. This could lead to over-extraction since the boiler that makes steam also warms the water to boil. The machines must also constantly rebuild their pressure between cups. This requires energy and time.

Many espresso machines use a rotary or vibration pump. A vibration model makes use of the vibrating disk to create pressure, while a rotary model pushes hot water through the ground at high speed. Both machines can make great espresso, but rotary machines are more stable, quieter and less likely to fail.

The Boiler

The boiler is the part that heats water to an ideal temperature for extraction. The steam that is produced will eventually reach the portafilter, which is the container that holds the espresso coffee grounds. It is then funneled into the cup. The steam creates pressure to push through the grounds of the coffee. This creates a foam on the top of the espresso. This is one of the main characteristics of a great espresso.

There are three types of espresso machines, each having a different type of pump and brew temperature. There are different ways that the brew can be controlled and the size of the cup that the maker can create.

The first espresso machines were steam-type. The first espresso machines were steam-type machines. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso machine is a semiautomatic one with an electric pump. This is what people envision when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans on your own The pump, however, regulates the water flow and pressure. This is an excellent compromise between human touch and the mechanized quality.

The Filter

Typically, espresso machines have filters that separate the coffee grounds as they pass through the hot water. The filter is also an essential component of the machine's temp control, as it prevents overheating.

It also helps with flavor, as it can allow for a longer bloom time. This allows the beans to let their nuances out, and also allows for better extraction.

However, it is important to remember that even a great filter can make a terrible cup of coffee as the quality of the beans and extraction are crucial.

This is where the magic happens. It's what makes espresso taste good. The grouphead (also called the brewhead) is where you put the portafilter - the thingy which you put the grounds of your coffee into when making espresso.

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

In recent years, coffeee.uk espresso machines driven by a compressed air compressor have become increasingly popular. They utilize an air compressor to force the hot water through the grounds, and are far more portable than electric steam-driven machines.