Let's Get It Out Of The Way! 15 Things About Machine Espresso We're Sick Of Hearing > 자유게시판

How Does Machine Espresso Work?

The machine espresso uses precision pressure, and a filter technology that is mind-blowing to make the coffee you enjoy. What exactly is it that makes it work?

Espresso is made by forcing hot water under high pressure through finely-ground coffee and espresso maker. The process is similar to making drip coffee but the key difference is in the pressure.

The Group Head

The group head is the portafilter is inserted when you are making best cheap espresso machine. It distributes water into the portafilter and regulates the pressure of the extraction. There are a variety of types of group heads each with its own advantages and drawbacks. Some are specifically designed for stability of temperature while others are specifically designed to handle pre-infusion. Others are made to control the lever. Some are a combination, such as the E61. This is a favorite among baristas because it offers multiple benefits in one package.

As you can see in the above photo the group head is fitted with a variety of notches. The portafilter is placed in these notches, then twist the head to lock it. There is also a gasket of rubber that is a part of the notches and helps create a seal when you insert your portafilter into the machine. The notches on the head permit a precise location of the portafilter which is crucial for a consistent extraction.

The group head not only allows you to insert your portafilter easily but also maintains the same temperature. It does this by circulating hot water through the brew container and around the portafilter, making sure that it is always at the right temperature for extraction. It is crucial to keep in mind that even a slight differences can make the distinction between a great and a excellent espresso.

The Pump

In contrast to piston machines that are manually operated, which use a lever to pressurize water, Rotary espresso machines rely on motorized pumps to supply the nine atmospheric bars of pressure that are required to extract espresso. The pressure is created by pumping water through a heat exchanger and then through the ground coffee.

Pumps tend to be less expensive than piston-driven machines, and they tend to last longer, however both types of machine can be damaged by excessive use and inadequate cleaning. They also make mechanically complex which can result in a high price tag on even the most basic models.

Some espresso machines make use of steam pressure instead of a pump in order 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 could lead to excessive extraction. These machines also have to continuously rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of a rotary or vibration pump. A vibration model employs a vibrating disk to generate pressure, while a rotating model pushes hot water through the ground at a fast speed. Both machines can make excellent espresso machines home but rotary machines are quieter, more durable and less likely to break.

The Boiler

The boiler is the element which heats the water to the ideal temperature to extract. The steam that is created will eventually reach 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 grounds of coffee through. This results in a layer crema on top espresso machines. This is one of the hallmarks of a good espresso.

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

The first espresso machines were steam type. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burned. This is why the Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most well-known espresso maker is a semi-automatic one that has an electric Espresso Maker pump. When people think of espresso machines, they think of these machines. With a semi-automatic machine you need to grind the beans and then tamp them by hand. However, the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanized consistency.

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 essential component of the machine's temp control, since it helps to prevent overheating.

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

However, it is important to remember that even a high-quality filter could result in a bad cup of coffee, since the quality of the beans and extraction is crucial.

This is where the magic happens, and it's what makes espresso taste great. The grouphead, sometimes called the brew head, is where the portafilter (the device you put the coffee ground into) is located when you're making espresso.

In the steam-driven espresso machine hot water is heated in an airtight tank to create steam, which then pushes the hot water through the grounds under high pressure. These machines are less expensive and easier for the user to maintain than pumps-driven models. However, they are limited in their ability to provide the ideal brewing conditions, since they operate at 1-1.5 bars of pressure. While the perfect shot requires 9-10 bar.

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