The Advanced Guide To Machine Espresso > 자유게시판

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How Does Machine Espresso Work?

The machine italian espresso machine uses precise pressure and filter technology that is mind-blowing to create the coffee you enjoy. What exactly does it work?

To make 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 Head of the Group

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

As you can see in the photo above the group head comes with many notches in which you can place your portafilter before twisting it manually to secure it. There is also a gasket of rubber that resides inside the notches to help create an airtight seal when you insert your portafilter into the machine. The notches on the head allow for a precise location of the portafilter which is essential to ensure an even extraction.

In addition to allowing you to easily place your portafilter in, the group head is responsible to maintain an even temperature. It does this by cycling hot water through the brew basket, and around the portafilter, making sure that it's always at the correct temperature to extract. It is crucial to keep in mind that even a best small espresso machine deviation can make the difference between a great and a excellent espresso.

The Pump

The motorized pumps in espresso machines rotary provide nine atmospheric bar pressure needed to extract espresso. This is different from manually operated piston machines that employ levers. 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 generally less expensive and last for longer than piston-driven machines. However, both types of machines can degrade because of excessive use and insufficient cleaning. Pumps are also more complicated mechanically, and can add to the price of even the simpler models.

Some buy espresso machine machines remove the pump completely and utilize steam pressure to make espresso. This can result in over-extraction because the boiler that makes steam also heats the water to boil. The machines must also continually rebuild their pressure between cups. This takes energy and time.

Many espresso machine black friday machines make use of a vibration or rotary pump, with a vibrating model using a vibrating disc that generates the pressure and an rotary model that pushes hot water through the grounds under high speed. Both models are capable of producing excellent espresso, however Rotary machines are quieter and more durable than vibration pumps.

The Boiler

The Dual boiler espresso machine is the one that makes the water warm to a temperature that is ideal 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, steam causes pressure to push through the grounds of the coffee and espresso maker. This results in a crema on the top of the espresso. This is one of the hallmarks of a great espresso.

There are three types of espresso makers. They differ in the type 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 the cup that can be produced by the machine.

The first espresso machines were steam-type. They had one boiler to create steam and brew, however, the pressure they could create was minimal - two bars of atmospheric pressure maximum. This resulted in the coffee tasting bitter and dual boiler Espresso machine burnt. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso maker is a semi-automatic device 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 on your own, but the pump regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanized quality.

The Filter

Espresso machines typically use filters that separate the grounds of the coffee from hot water. The filter is also an essential component of the machine's temp control, since it helps to prevent overheating.

Filters also aid in flavor as it allows for an extended flowering time. This helps the beans release their nuances and gives an opportunity to improve 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 is crucial.

It's in this area that the magic happens. This is what makes espresso taste so delicious. The grouphead (also called the brewhead) is where you put the portafilter - the thingy which you put the coffee grounds in, while making espresso.

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

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