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

How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and amazing filter technology to make the coffee we love. What exactly does it work?

Espresso is created by forcing hot water 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 you insert when brewing espresso. It disperses the water into the portafilter, and then regulates the pressure during the extraction. There are many different kinds of group head each with its distinct advantages and drawbacks. Some are focused on temperature stability, others on pre-infusion options, and others are designed to control the lever. Some are a combination, such as the E61. This is a preferred choice for baristas due to the fact that it has multiple advantages in a single package.

As you can see in the image above, the group head is equipped with several notches. The portafilter is placed inside these notches, and then turn the head around to secure it. There is also a rubber gasket which is located inside the notches, which helps create a seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is crucial to ensure an even extraction.

Aside from allowing you to effortlessly insert your portafilter the group head is responsible for maintaining a consistent 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. This is vital, because just a few degrees could make the difference between excellent and great espresso.

The Pump

In contrast to piston machines that are manually operated, that use a lever to pressurize water, the rotary espresso machines espresso machines use motorized pumps that provide the nine atmospheric bars of pressure required for espresso extraction. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be cheaper and last longer than piston-driven machines. However, both kinds of machines can degrade due to excessive use and poor cleaning. They also increase the complexity of mechanical systems, which can result in costly prices for even the simplest models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The drawback of this is that the same boiler that produces steam also increases the temperature of the water until it reaches boiling, which can lead to excessive extraction. They also have to constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines utilize an rotary or vibrating pump, with a vibration model that uses a vibrating disc best bean to cup espresso machine create pressure and rotating models that push hot water through the grounds under high speed. Both models can produce an excellent espresso, but the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component that heats the water to the ideal temperature to extract. The resulting steam is then transferred to the portafilter that contains the ground espresso and is then funneled down into the cup. During this process, steam creates pressure that pushes through the coffee grounds. This creates a foam on top of the espresso. This is one of the main characteristics of a good espresso.

There are three types of espresso machines, each with a different type of pump and the temperature of the brew. There are different ways to control the strength of the brew and the size of cup that can be produced by the machine.

The first espresso machines were steam types. They had only one boiler to make steam and brew, however, the pressure they could generate was low - only two bars of atmospheric pressure at most. The coffee tasted bitter and burnt. The modern espresso machine was invented by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most popular espresso machine is a semiautomatic that has an electric pump. These are the images people have when they imagine an professional espresso maker machine. If you have a semi-automatic machine you need to grind the beans and tamp them by hand. The pump is able to regulate the flow of water and pressure. This is an excellent compromise between human touch and the mechanized consistency.

The Filter

Espresso machines usually have filters that separate the grounds of the coffee from hot water. The filter is also an essential element of the temperature control system since it helps prevent the machine from overheating.

It also enhances flavor, as it allows for a longer bloom phase. This helps the beans let their nuances out and provides the chance for better extraction.

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

This is where the magic happens, it's the thing that makes an espresso really taste great. The grouphead, also referred to as the brewhead, is where the portafilter (the device you put the coffee grounds into) is placed when you're making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight container to create steam. The steam then pushes hot water through the grounds of the coffee under pressure. These kinds of machines tend to be less expensive and easier to maintain than pump-driven models. However, they are not as efficient in their ability to create the ideal conditions for brewing since they operate at 1-1.5 bars of pressure. However, the perfect shot requires 9-10 bars.

In recent years, compressed air-pump-driven espresso machines have become more popular. They use an air compressor to push hot water through the grounds and are much more portable than electric steam-driven machines.