9 Lessons Your Parents Taught You About Machine Espresso > 자유게시판

How Does machine espresso (Bookmark-master.com) Work?

Machine espresso utilizes precise pressure and amazing filter technology to make the perfect cup of coffee machines espresso. What exactly does it work?

espresso machines for home is made by pushing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee however the main difference lies in the pressure.

The Group Head

As the name implies, the group head is the place you insert your portafilter when making espresso. It disperses water into the portafilter, and then regulates the pressure during the extraction. There are many different kinds of group head, each with their particular advantages and disadvantages. Some are focused on temperature stability, some on pre-infusion capabilities, while others are designed to control the lever. Some come with a combination of both, such as the E61. This is a popular choice among baristas because it offers multiple benefits in one package.

As you can see in the photo above the group head is made up of numerous notches that you can place your portafilter and then twist it with your hands to secure it. A gasket of rubber is situated within the notches to create a seal as you insert your portafilter. The notches permit an exact placement of the portafilter. This is crucial to ensure an accurate extraction.

The group head does not just allow you to place your portafilter easily however it also keeps an even temperature. This is done by cycling hot water around the portafilter and through the brew-basket, making sure that the temperature is constant to extract the coffee. It is important to remember that even a slight variation can mean the difference between a great and a great espresso.

The Pump

The motorized pumps used in rotary espresso machines supply the nine atmospheric bars of pressure required for espresso extraction. This is different from manual piston machines that use levers. The pressure builds by removing tap water from a reservoir and pumping it through a heat exchanger before being pushed through the ground coffee inside the group head.

Pumps are typically more affordable and last longer than piston-driven machines. However, both kinds of machines can deteriorate because of frequent use and insufficient cleaning. They also add mechanical complexity and can lead to costly prices for even the simplest models.

Certain espresso machines utilize steam pressure instead of a pump for brewing espresso. This can cause over-extraction because the boiler that produces steam also heats the water to boil. The machines must also continually rebuild their pressure between cups. This takes energy and time.

Many espresso machines employ the rotary or vibration pump, with a vibrating model using a vibrating disc to generate the pressure and an rotary model that pushes hot water through the grounds under high speed. Both machines can make excellent espresso however rotary machines tend to be quieter, more durable and less likely to break.

The Boiler

The boiler is the element that heats the water to the optimal temperature for extraction. The resultant steam then reaches the portafilter containing the ground espresso coffee and is then pumped down into the cup. During this process the steam causes enough pressure to push the coffee grounds through. This produces a layer of crema that is then poured over. This is a sign of a good espresso.

There are three types of espresso machines, each having different pumps and brew temperature. There are a variety of ways that the brew may be controlled, as well as the dimensions of the cup the machine can make.

The earliest espresso machines were steam-based. The earliest espresso machines were steam types. This led to the coffee tasting bitter and burnt. This is why the Milanese manufacturers Luigi Bezzerra and Desiderio Pavoni invented the modern professional espresso machine machine.

The most common espresso machine is a semiautomatic one with an electric pump. This is what people envision when they think of an espresso machine coffee machine. With a semi-automatic machine you grind the beans and tamp them yourself but the pump is able to regulate the flow of water and pressure. This is a perfect solution that combines human control with mechanized accuracy.

The Filter

Espresso machines typically have filters that separate the grounds of the coffee from the hot water. The filter is also an essential element of the temperature control system as it prevents the machine from overheating.

Filters also aid in flavor because it allows for a longer flowering period. This helps the beans to let their nuances out and provides an opportunity to improve extraction.

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

This is where the magic happens. It's what makes espresso taste good. The grouphead (also called the brewhead) is where you put the portafilter, the thingy used to place the coffee grounds into, when making espresso.

In the steam-driven espresso machine hot water is heated in an airtight container to create steam. Steam then pushes the hot water through the grounds at high pressure. These kinds of machines are usually cheaper and easier to maintain than pump-driven models. However, they are limited in their ability to create the perfect brewing conditions as they only operate at 1-1.5 bars of pressure, while the perfect shot requires 9-10 bars.

In recent years, espresso coffee maker machines driven by a compressed air compressor have become increasingly popular. They utilize an air compressor to push hot water through the grounds and are significantly more portable than steam-driven electric machines.