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

How Does Machine Espresso Work?

Machine cafe espresso machine utilizes precise pressure and mind-blowing filter technology to make the perfect cup of coffee. How does it work exactly?

Espresso is made by pushing hot water at high pressure through finely ground coffee. The process is similar to making drip coffee, but the key difference is in the pressure.

The Head of the Group

As the name implies the group head is where you insert your portafilter when brewing espresso. It distributes water into the portafilter, and regulates the pressure during the extraction. There are many different types of group heads each with distinct advantages and drawbacks. Some are specifically designed for the stability of temperature while some are designed to handle pre-infusion. Some are designed to control the lever. Some contain a variety of features, like the E61, which is the most popular choice among baristas because of its ability to provide multiple benefits in one package.

As you can see in the above photo the group head is fitted with several notches. It is possible to place your portafilter into these notches and twist the head to lock it. There is also a gasket made from rubber which is located inside the notches bean to cup espresso machine help create an airtight seal after inserting your portafilter into the machine. The notches permit the precise placement of the portafilter. This is vital for an even extraction.

The group head is not just able to allow the portafilter to be inserted easily however it also keeps a constant temperature. This is achieved by cycling hot water around the portafilter and through the brew-basket to ensure the temperature is always right to extract the coffee. It is important to realize that even a slight deviation can make the difference between a good and a great espresso.

The Pump

Motorized pumps in rotary espresso machines supply the nine atmospheric bar pressure required to extract espresso. This is different from manual piston machines that use a lever. The pressure is created by removing tap water from a reservoir, and pumping it through a heat exchanger prior being shot through the ground coffee inside the group head.

Pumps are typically less expensive and last longer than piston-driven machines. However, both types of machines can degrade due to overuse and insufficient cleaning. They also increase the complexity of mechanical systems which can result in an expensive price for even the simplest models.

Some espresso machines use steam pressure instead of a pump in order to brew italian espresso machines. The drawback of this is that the same boiler that produces steam also increases the temperature of the water to the point of boiling and can result in excessive extraction. They also have to constantly rebuild their pressure in between cups. This takes energy and time.

Many espresso machines make use of the rotary or vibration pump, with a vibration model using a vibrating disc to create pressure, and an rotary model that pushes hot water through the grounds at high speed. Both models can make a great espresso, however Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part that heats water to the optimal temperature for extraction. The steam that is created reaches the portafilter, which is a container for espresso grounds. It is then poured into the cup. During this process the steam is able to create enough pressure to push the coffee grounds through. This creates a foam on the top of the espresso. This is one of the hallmarks of a good espresso.

There are three types of espresso makers, which differ in the kind of pump they use and the degree of heat that the brew is. There are a variety of ways to control the strength of the brew and the size of cup that can be produced by the machine.

The first espresso machines espresso machines were steam types. The first espresso machines were steam types. The coffee tasted bitter and burnt. This is the reason why Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most commonly used espresso maker is a semi-automatic device with an electric pump. This is what people envision when they think of an espresso maker. If you have a semi-automatic machine you must grind the beans and tamp them by hand. However, the pump provides regulated water flow and pressure. This is a fantastic compromise between human control and mechanized reliability.

The Filter

Espresso machines usually have a filter that separates the coffee grounds from the hot water. The filter is also a vital element of the machine's temperature control, as it prevents overheating.

It also helps with flavor, since a filter can allow for a longer bloom phase. This lets the beans release their flavors, and allows for a better extraction.

It is important to remember that even the finest filter could result in a poor cup of coffee. The quality espresso machine of the beans and the extraction process, are still crucial.

This is where the magic happens, it's what makes espresso taste great. The grouphead, often referred to as the brew head, is the place where the portafilter (the device you put the ground coffee into) is placed when you're making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to produce steam, which is then pushed through the grounds with high pressure. These machines are cheaper and easier for the user to maintain than pumps-driven models. They are however limited in their ability to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

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