9 . What Your Parents Taught You About Machine Espresso > 자유게시판

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How Does machine espresso (the original source) Work?

Machine espresso employs precise pressure and amazing filter technology to make the perfect cup of coffee. What exactly is it that makes it work?

Espresso is created by forcing hot water at high pressure through finely ground coffee. The process is similar to that of making drip coffee. However the pressure is the major difference.

The Group Head

As the name suggests the group head is the place you place your portafilter while making espresso coffee maker. It is responsible for dispersing the water into the portafilter and controlling the pressure of the extraction. There are many different types of group heads each with distinct advantages and disadvantages. Some focus on temperature stability, others on pre-infusion capabilities, and still others are designed to control the lever. There are also some that contain a variety of features, such as the E61, which is considered the most popular choice among baristas because of its ability to offer multiple benefits in one package.

As you can see from the photo above the head of the group is fitted with several notches. You place your portafilter in these notches and then twist the head to lock it. There is also a rubber gasket in the notches, which helps create an airtight seal after inserting your portafilter into the machine. The notches permit precise placement of the portafilter. This is crucial for an accurate extraction.

Apart from allowing you easily insert your portafilter, the group head is responsible for Machine Espresso maintaining an even temperature. This is done by cycling hot water around the portafilter and through the brew-basket, ensuring that the temperature is at the right level to extract the coffee. This is crucial, since even a few degrees can make the difference between a excellent and great espresso.

The Pump

In contrast to piston machines that are manually operated, that use a lever to pressurize water, the rotary espresso machines use motorized pumps to supply the nine atmospheric bars of pressure needed for espresso extraction. The pressure is built by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be less expensive than piston-driven machines and tend to last longer, however both types of machines could 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 make use of steam pressure instead of a pump in order to brew travel espresso maker. The downside is that the same boiler that produces steam also increases the temperature of the water to boiling which could lead to over-extraction. The machines also need to continually rebuild their pressure between cups. This takes energy and time.

Many espresso machines make use of the rotary or vibration pump, which has a vibration model using a rotating disc to create the pressure and a rotary model pushing hot water through the grounds under high speed. Both types of machine can make a great espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is the component that heats water to an optimal temperature for extraction. The resultant steam then reaches the portafilter that contains the ground espresso coffee, and is then pumped into the cup. The steam generates enough pressure to push the coffee grounds through. This creates a crema on top of the espresso. This is the hallmark of a great espresso.

There are three different types of espresso machines, each having distinct pumps and brew temperature. 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. They utilized one boiler to make both brew and steam, but the pressure they could create was minimal - two bars of atmospheric pressure at most. This resulted in the coffee tasting burnt and bitter. This is the reason why Milanese producers Luigi Bezzerra and Desiderio Pavoni invented the modern espresso machine.

The most commonly used espresso machine is a semiautomatic that has an electric pump. This is what people envision when they think of an espresso maker. Semi-automatic machines require you to grind and tamp the beans on your own The pump, however, regulates the flow of water and pressure. This is a great combination of human control and mechanized accuracy.

The Filter

Typically, espresso machines for home machines use filters to separate the grounds of coffee as they move through the hot water. The filter is also a vital element of the temperature control system, as it prevents the machine from overheating.

Filters also aid in flavor, as it permits an extended flowering time. This lets the beans release their nuances, and allows for better extraction.

It is important to remember that even the most efficient filter can result in a bad cup of coffee. The quality of the beans and the extraction process remain vital.

This is where the magic happens, it's what makes an espresso really taste good. The grouphead, sometimes called the brewhead, is where the portafilter (the thingy you put the coffee ground into) is placed when you're making espresso.

Steam-driven espresso machines make use of hot water that is heated inside an airtight vessel to create steam. The steam then pushes hot water into the grounds of coffee under high pressure. These types of machines are typically less expensive and easier to maintain than pumps-driven models. However, they are not as efficient in their capacity to create the perfect brewing conditions since they operate at 1-1.5 bars of pressure. However, Machine Espresso the perfect shot requires 9-10 bar.

In recent years, compressed-air-pump-driven espresso machines for home machines have become more popular. They use an air compressor to push hot water into the grounds and are more portable than steam-driven electric espresso maker machines.