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

How Does Machine Espresso Work?

The machine espresso makes use of precision pressure, and filter technology that is mind-blowing to make the coffee you love. How exactly does it work?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the main difference.

The Group Head

The group head is the portafilter that you insert when brewing espresso. It is responsible for dispersing water into the portafilter and controlling the pressure of the resulting extraction. There are a variety of group heads each with their own advantages and disadvantages. Some are focused on temperature stability, while others on pre-infusion capabilities, while others are designed to control the lever. Some have a combination, such as the E61. This is a preferred choice for baristas since it provides multiple advantages in a single package.

As you can see in the photo above The group head features numerous notches that you can put your portafilter, then twist it by hand to lock it in. There is also a gasket made from rubber that resides inside the notches and helps create a seal when you insert your portafilter into the machine. The notches allow for an exact placement of the portafilter. This is crucial for a consistent extraction.

Apart from allowing you effortlessly insert your portafilter the group head is responsible for maintaining a consistent temperature. It does this by circulating hot water through the brew pan and around the portafilter, ensuring that it is always at the right temperature to extract. It is important to note that even a small deviation can make the difference between a great and a excellent espresso.

The Pump

The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bars of pressure 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 more affordable and last longer than piston-driven machines. However, both types of machines are susceptible to degrading due to excessive use and poor cleaning. They also add mechanical complexity which can result in the cost of even the simplest models.

Certain espresso machines do away with the pump completely and instead make use of steam pressure to make espresso. This can cause over-extraction because the boiler that makes steam also heats the water to boil. In addition, these machines frequently have to rebuild their pressure between cups, which requires time and energy.

Many Espresso Coffee Machines For Sale machines make use of an rotary or vibrating pump, with a vibration model using a vibrating disc to create pressure, and rotating models that push hot water through the grounds under high end espresso machine speed. Both models can produce an excellent espresso, but Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the element that heats the water to the ideal temperature to extract. The steam created gets to the portafilter which is a container for espresso grounds. It is then poured into the cup. In this process, the steam creates pressure and pushes through the grounds of the coffee. This results in a crema on top espresso machines of the espresso. This is one of the main characteristics of a great espresso.

There are three distinct types of espresso machines, each with different pumps and the temperature of the brew. There are a variety of ways in which the brew can be controlled and the size of the cup the machine can produce.

The first espresso machines were steam-type. They employed one boiler to create steam and brew, however, the pressure they could produce was very low - just two bars of atmospheric pressure at most. The coffee tasted bitter and burned. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso machine is a semiautomatic model with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines espresso machines require you to grind and tamp the beans by yourself while the pump controls the flow of water and pressure. This is an excellent compromise between human touch and mechanized consistency.

The Filter

Typically, espresso machines use a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital component of the machine's temp control, as it helps prevent overheating.

A filter can also help with flavor since it allows for an extended flowering time. This allows the beans to release their flavor and improves extraction.

However it is crucial bean to cup espresso machine keep in mind that even a good filter could result in a bad cup of coffee, because the quality of the beans and extraction are vital.

It's here that the magic occurs. This is what makes espresso taste so delicious. The grouphead, also called the brew head, is the place where the portafilter (the thing you put the ground coffee into) is located when you're making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. This then pushes the hot water through the grounds under high pressure. These machines are less expensive and are easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the ideal 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 pump have become increasingly popular. They make use of an air compressor to force hot water through the ground. They are also more mobile than steam-driven electric espresso machines.