13 Things You Should Know About Machine Espresso That You Might Not Have Considered > 자유게시판

How Does Machine Espresso Work?

The machine espresso is made using precision pressure, and filter technology that is awe-inspiring to make the coffee you love. How exactly does it work?

To make an espresso, hot water is forced under high end espresso machine pressure through finely ground coffee espresso machines. The process is similar to making drip coffee but the difference is in the pressure.

The Group Head

The group head is the portafilter that you insert when brewing espresso. It distributes water into the portafilter, and then regulates the pressure of extraction. There are a variety of group heads each with distinct advantages and drawbacks. Some are designed to provide stability in temperature, while others are specifically designed to handle pre-infusion. Some are designed to control the lever. There are some that come with a range of features, such as the E61 that is the most popular choice among baristas due to its ability to offer multiple benefits in a single package.

As you can see in the image above, the group head has several notches to place your portafilter before twisting it manually to lock it in. A gasket made of rubber is positioned inside the notches, which helps create a seal when you insert your portafilter. The notches permit the precise placement of the portafilter. This is vital for an even extraction.

The group head not only lets the portafilter to be inserted easily, but it also maintains the same temperature. This is achieved by cycling hot water around the portafilter and through the brew-basket, ensuring that the temperature is always at the right level for extraction. It is important to remember that even a small variation can mean the difference between a good and a great espresso.

The Pump

Unlike manual piston machines, which rely on a lever that pressurize water, Rotary cafe espresso machine machines rely on motorized pumps that provide the nine atmospheric bars of pressure necessary for espresso extraction. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps are typically less expensive than piston-driven machines and tend to last longer, although both types of machines may be damaged by excessive use and inadequate cleaning. They also make mechanically complex which can result in costly prices for even the simplest models.

Some espresso machines remove the pump completely and employ steam pressure to create espresso. This could lead to over-extraction since the boiler that produces steam also causes the water to boil. They also have to constantly rebuild their pressure between cups. This takes energy and time.

A large majority of espresso machines employ a rotary or vibration pump. A vibration model utilizes the vibrating disk to create pressure, whereas a Rotary model pushes hot coffee through the ground at a rapid speed. Both types of machine can make excellent espresso, but Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The boiler is the component that heats water to an ideal temperature to extract. The steam created reaches the portafilter, which contains the espresso coffee grounds. It is then poured into the cup. During this process, the steam creates pressure and pushes through the grounds of the coffee. This creates a crema on the top of the espresso. This is the hallmark of a great espresso.

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

The first espresso machines were steam-based. They had one boiler to create both steam and brew however the pressure they were able to produce was very low - just two bars of atmospheric pressure at the most. The coffee for espresso machine - read article - tasted bitter and burnt. This is the reason Milanese makers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most commonly used espresso maker is a semi-automatic machine that has an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans yourself The pump, however, regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanized accuracy.

The Filter

Typically, espresso machines utilize filters to separate the grounds of coffee as they move through the hot water. The filter is also an important element of the temperature control system, since it helps prevent the machine from overheating.

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

However, it is important to keep in mind that even a great filter can produce a bad cup of coffee, as the quality of the beans and extraction are important.

This is where the magic happens, it's what makes espresso taste great. The grouphead, often called the brew head, is the place where the portafilter (the thing you put the ground coffee in) is placed when making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight vessel to create steam. The steam then pushes hot water through the coffee grounds under high pressure. These types of machines are typically less expensive and easier to maintain than pumps-driven models. They are however limited in their ability to create 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, compressed air-pump-driven pro espresso machine machines have been gaining popularity. They utilize an air compressor to push hot water through the ground and are much more mobile than electric steam-driven espresso machines.