10 Facts About Machine Espresso That Will Instantly Put You In Good Mood > 자유게시판

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How Does Machine Espresso Work?

Machine travel espresso maker employs precise pressure and mind-blowing filter technology to make the delicious coffee we enjoy. How does it work exactly?

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

The Head of the Group

The group head is the portafilter you place in the italian espresso machine maker when making it. It is responsible for dispersing the water into the portafilter and then controlling the pressure that results from the extraction. There are numerous kinds of group heads each with distinct advantages and disadvantages. Some are designed to provide temperature stability while others are built to handle pre-infusion. Others are made to control the lever. There are some that come with a range of features, like the E61 that is the classic choice among many baristas because of its ability to offer multiple perks in one package.

As you can see in the above image The group head features several notches where you place your portafilter and then twist it with your hands to lock it in. There is also a gasket made of rubber that resides inside the notches to help create the seal when you insert your portafilter into the machine. The notches permit precise placement of your portafilter. This is crucial to ensure a consistent extraction.

In addition to allowing you to easily place your portafilter in, the group head is also responsible for maintaining an even temperature. This is accomplished by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is constant to extract the coffee. This is important because just a few degrees could be the difference between a good and great espresso.

The Pump

The motorized pumps that are used in rotary espresso machines supply the nine atmospheric bar pressure required to extract espresso. This is different from manual piston machines which use levers. This pressure is built up by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven models, and they tend to last longer, however both types of machines could degrade with overuse and insufficient cleaning. Pumps are also more complex mechanically, which can raise the price of even the simpler models.

Some espresso machines use steam pressure instead of a pump for brewing espresso. The drawback of this is that the boiler that produces steam also increases the temperature of the water to boiling which could lead to excessive extraction. In addition the machines often have to restore their pressure between cups, which requires time and energy.

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

The Boiler

The boiler is the part that heats water to the optimal temperature for extraction. 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 causes pressure to push through the coffee grounds. This creates a crema on top of the espresso. This is one of the hallmarks of a great espresso.

There are three different types of espresso machines, each with a different type of pump and the temperature of the brew. 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 were steam-type. They employed one boiler to make both steam and brew but the pressure they could create was minimal - two bars of atmospheric pressure at the most. The coffee tasted bitter and burnt. This is the reason Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine.

The most commonly used espresso machine is a semiautomatic model with an electric pump. These are the images people have when they think of an espresso maker. Semi-automatic machines require you to grind and tamp your beans yourself The pump, however, espressomachines regulates the water flow and pressure. This is a great compromise between human control and mechanized consistency.

The Filter

Espresso machines typically have filters that separate the grounds of the coffee from hot water. The filter is also an essential part of the machine's temperature control, since it stops overheating.

A filter also improves flavor since it allows for a longer flowering phase. This helps the beans release their flavors and provides the chance for better extraction.

However, it is important to keep in mind that even a top filter can make a terrible cup of coffee, since the quality of the beans and extraction are vital.

It's in this area that the magic happens. This is the reason why espresso tastes so good. The grouphead, often referred to as the brew head, is the place where the portafilter (the device you put the ground coffee into) sits when you're making espresso.

In a steam-driven espresso machine hot water is heated in an airtight container to create steam. Steam is then pushed through the grounds at high pressure. They are less expensive and are easier for the user to maintain than pumps-driven models. However, they are limited in their ability to provide the ideal brewing conditions, because they operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bars.

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