The Expert Guide To Machine Espresso > 자유게시판

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How Does Machine Espresso Work?

The machine espresso utilizes precision pressure, and filter technology that is mind-blowing to make the coffee you love. What exactly does it work?

To make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However, the pressure is the primary difference.

The Head of the Group

The group head is the portafilter you place in the espresso maker when making it. It is responsible for dispersing the water into the portafilter and controlling the pressure of the extraction. There are a variety of types of group head, each with their particular advantages and drawbacks. Some are designed for stability in temperature, while others are designed to handle pre-infusion. Others are made to control the lever. There are even some that come with a range of features, like the E61 that is the most popular choice among baristas because of its ability to offer multiple benefits in a single package.

As you can see in the above photo, the group head has several notches to place your portafilter and twist it with your hands to secure it. There is also a gasket made from rubber which is located inside the notches, which helps create the seal when you insert your portafilter into the machine. The notches permit an exact placement of the portafilter. This is crucial to ensure an even extraction.

Apart from allowing you easily insert your portafilter, the group head is also responsible to ensure that the temperature remains even. This is achieved by cycling hot water around the portafilter, and through the brew basin, ensuring the temperature is always right for extraction. This is important because even a small difference in temperature can make the difference between excellent and great espresso.

The Pump

The motorized pumps that are used in rotary mini espresso machine machines provide the nine atmospheric bar pressure needed to extract espresso. This is different from manual piston machines which use levers. The pressure builds by drawing tap water from a reservoir, and pumping it through a heat exchanger prior being shot through the ground coffee in the group head.

Pumps are generally less expensive and last longer than piston-driven machines. However, both types of machines can degrade due to excessive use and inadequate cleaning. They also increase the complexity of mechanical systems which can result in the cost of even the simplest models.

Some espresso machines do away with the pump completely and instead utilize steam pressure to make espresso. This can lead to over-extraction as the boiler that produces steam also heats the water until it comes to a boil. They also have to constantly rebuild their pressure in between cups. This requires energy and time.

Many espresso machines employ an rotary or vibrating pump, which is a vibration model using a rotating disc to generate the pressure, and rotating models that push hot water through the grounds under high speed. Both machines can make great espresso and filter coffee machine however rotary machines tend to be more stable, quieter and less likely to break down.

The Boiler

The boiler is the one that heats the water to the ideal temperature for extraction. The resulting steam is then transferred to the portafilter containing ground espresso beans and gets funnelled down into the cup. During this process the steam generates enough pressure to push the coffee grounds through. This creates a foam on the top of the espresso. This is a sign of a good espresso.

There are three kinds of espresso makers, and they differ in the kind of pump they use and the degree of heat that the brew is. There are a variety of ways to control the brew and the size of cup that can be produced by the machine.

The first espresso machines were steam-types. The earliest espresso Coffee machines uk machines were steam-type machines. The coffee tasted bitter and burned. The modern espresso machine was invented by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most common espresso machine is a semiautomatic model with an electric pump. This is what people envision when they think of an espresso machine with frother maker. Semi-automatic machines require you to grind and tamp your beans yourself, but the pump regulates the flow of water and pressure. This is a great compromise between the human touch and the mechanized accuracy.

The Filter

Espresso machines typically use a filter that separates the grounds of coffee from hot water. The filter is also a crucial part of the temperature control system, as it prevents the machine from overheating.

A filter can also help with flavor since it allows for an extended flowering time. This allows the beans to release their nuances, and allows for better extraction.

However it is crucial to keep in mind that even a high-quality filter can produce a bad cup of coffee as the quality of the beans and extraction is still essential.

It's here that the magic takes place. This is what makes espresso taste so good. The grouphead, also called the brewhead, is where the portafilter (the thingy you put the ground coffee in) is placed when making espresso.

Steam-driven espresso machines use hot water heated in an airtight container to make steam. The steam then pushes hot water into the grounds of the coffee under pressure. They are less expensive and easier for the owner to maintain than pumps-driven models. They are however limited to create the ideal conditions for brewing as they only operate with 1-1.5 bar of pressure. The ideal 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 the grounds, and are far more portable than electric steam-driven machines.