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

How Does Machine Espresso Work?

Machine espresso (telegra.Ph) uses precision pressure and amazing 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 making drip coffee, however the main difference lies in the pressure.

The Group Head

As the name suggests, the group head is where you place your portafilter when brewing espresso. It is responsible for dispersing water into the portafilter and controlling the pressure of the extraction. There are several different types of group head, each with their distinct advantages and drawbacks. Some are designed to provide stability of temperature while others are built to handle pre-infusion. Others are built to control the lever. There are also some that include a mix of features, such as the E61 that is to be the most popular among baristas due to its capacity to provide multiple benefits in a single package.

As you can see in the above image, the group head has several notches to place your portafilter and twist it manually to lock it in. A rubber gasket is located within the notches to make a seal when you insert your portafilter. The notches allow for an exact placement of the portafilter. This is crucial for an efficient extraction.

Apart from allowing you easily insert your portafilter, the group head is also responsible for maintaining a consistent temperature. This is achieved by cycling hot water around the portafilter, and through the brew-basket, making sure that the temperature is at the right level to extract the coffee. It is important to realize that even a few degree variation can mean the difference between a good and a great espresso.

The Pump

The motorized pumps used in rotary uk espresso machine machines provide the nine atmospheric bar pressure needed to extract espresso machine black friday. 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 tend to be less expensive than piston-driven models, and they tend to last longer, however both types of machine can become damaged due to excessive use and poor cleaning. Pumps are also more complex mechanically, and can add to the cost of even most basic models.

Some espresso machines remove the pump entirely and employ steam pressure to create espresso. This can result in over-extraction because the boiler that makes steam also causes the water to boil. The machines must also constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines utilize a vibration or rotary pump, which is a vibration model using a rotating disc that generates the pressure and the rotary model pushing hot water through the grounds at high speed. Both machines can make great espresso but rotary machines are more quiet, durable and less likely to break.

The Boiler

The boiler will heat the water to the ideal temperature to extract. The resultant steam then reaches the portafilter containing ground espresso beans and is then funneled down into the cup. The steam creates pressure and pushes through the coffee grounds. This results in a crema on top of the espresso. This is the hallmark of a great espresso.

There are three kinds of espresso makers. They differ in the kind of pump they use and how hot the barista espresso coffee machine is. There are a variety of ways to control the strength of the brew and the size of cup that can be made by the machine.

The first espresso machine with milk frother machines were steam-types. They utilized only one boiler to make both brew and steam, however the pressure they were able to generate was low - only two bars of atmospheric pressure at the most. The coffee tasted bitter and burnt. The modern espresso machine was designed by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso maker is a semi-automatic device with an electric pump. These are the things people think of when they think of an espresso maker. With a semi-automatic espresso machine, you grind the beans and tamp them by hand, but the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanised consistency.

The Filter

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

It also helps with flavor, as it allows for a more prolonged bloom phase. This allows the beans to let their nuances out, and also allows for better extraction.

However it is crucial to keep in mind that even a high-quality filter can produce a bad cup of coffee as the quality of the beans and extraction is still vital.

This is where the magic happens, and Machine Espresso it's what makes an espresso really taste good. The grouphead (also known as the brewhead) is where you place the portafilter - the thingy used to place the coffee grounds into, while making espresso.

Steam-driven espresso machines make use of hot water that is heated inside an airtight container to produce steam. The steam then pushes hot water through the grounds of coffee at high pressure. These kinds of machines tend to be less expensive and simpler to maintain than pump-driven models. They are however limited for creating the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

In recent years, espresso machines driven by compressed air-pump have become increasingly popular. They use an air compressor to force hot water through the ground. They are also more mobile than electric steam-driven espresso machines.