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How Does machine espresso (One-bookmark.Com) Work?

Machine espresso makes use of precise pressure and amazing filter technology to make the delicious coffee we enjoy. How exactly does it work?

Espresso is made by forcing hot water at high 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 suggests the group head is the place you put your portafilter in when making espresso. It disperses water in the portafilter and regulates the pressure of extraction. There are many different kinds of group heads, each with their distinct advantages and drawbacks. Some are designed to provide stability in temperature, while others are designed to handle pre-infusion. Others are made to control the lever. There are some that have a combination of features, such as the E61, which is the standard choice for many baristas due to its ability to offer multiple benefits in one package.

As you can see in the photo above the group head is equipped with several notches. You place your portafilter in these notches, then twist the head to lock it. A rubber gasket is located inside the notches, which helps create a seal when you insert your portafilter. The notches on the head allow for an exact location of the portafilter which is essential to ensure an even extraction.

In addition to allowing you easily connect your portafilter, the group head is also responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, making sure that the temperature is at the right level to extract the coffee. This is crucial, since even a small difference in temperature can make the difference between a excellent and great espresso.

The Pump

The motorized pumps that are used in rotary espresso machines provide the nine atmospheric bar pressure that is required for espresso extraction. This differs from manual piston machines that use levers. The pressure builds by drawing tap water from a reservoir and pumping it through a heat exchanger prior to being pumped 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 may degrade due to excessive use and inadequate cleaning. Pumps are also more complex mechanically, which can increase the cost of even the simplest models.

Some espresso machines make use of steam pressure instead of a pump to brew espresso. The disadvantage of this is that the boiler that produces steam also raises the temperature of the water until it reaches boiling which could lead to over-extraction. Additionally, these machines frequently have to rebuild their pressure between cups, which takes time and energy.

Many espresso machines utilize a vibration or rotary pump, with a vibration model using a rotating disc that generates the pressure, and rotating models that push hot water through the grounds under high 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 element that heats the water to the ideal temperature for extraction. The resulting steam is then transferred to the portafilter that contains the ground espresso and is then pumped into the cup. During this process, steam creates pressure to push through the coffee grounds. This creates a foam on the top of the espresso. This is one of the hallmarks of a great espresso.

There are three types of espresso makers, and they differ in the kind of pump they use and the degree of heat that the brew is. There are different ways to control the amount of brew, as well as the size of the cup that can be produced by the machine.

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

The most popular espresso machine is a semiautomatic one with an electric pump. These are what people imagine when they think of an espresso machine. With a semi-automatic machine you must grind the beans and tamp them by hand. However, the pump provides regulated water flow and pressure. This is a great compromise between the human touch and mechanized accuracy.

The Filter

Typically, espresso machines have a filter to separate out the grounds of the coffee as they go through the hot water. The filter is also an essential part of the machine's temperature control, since it helps to prevent overheating.

It also helps with flavor as a filter can allow for a longer bloom time. This allows beans to release their nuances and gives an opportunity for better extraction.

However, it is important to keep in mind that even a great filter could result in a bad cup of coffee, because the quality of the beans and extraction is vital.

It's here that the magic occurs. This is what makes espresso coffee machine with milk frother taste so delicious. The grouphead, often referred to as the brewhead, is where the portafilter (the thingy you put the coffee ground into) is located when you're making espresso.

In an espresso machine that is driven by steam, hot water is heated in an airtight container to create steam. Steam is then pushed through the grounds under high pressure. These machines are less expensive and easier to maintain than pumps-driven models. However, they are limited in their ability to create the perfect conditions for brewing, as they only operate at 1-1.5 bars of pressure. However, the perfect shot requires 9 bar espresso machine-10 bars.

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