10 Things That Your Family Teach You About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso uses precision pressure and mind-blowing filter technology to make the delicious coffee we enjoy. What exactly is it that makes it work?

Espresso is made by forcing hot water under high pressure through finely ground coffee. The process is similar to that of making drip coffee. However it is the pressure that makes the main difference.

The Head of the Group

The name implies the group head is where you insert your portafilter when brewing espresso. It disperses water in the portafilter, and regulates the pressure during the extraction. There are several different types of group head, each with their particular advantages and drawbacks. Some are designed for the stability of temperature while some are designed to handle pre-infusion. Others are made to control the lever. There are even some that come with a range of features, such as the E61 that is the classic choice among many baristas due to its ability to offer multiple benefits in a single package.

As you can see in the above image the group head comes with many notches in which you can put your portafilter, then twist it by hand to secure it. There is also a gasket of rubber which is located inside the notches and helps create an airtight seal when you insert your portafilter into the machine. The notches on the head permit a precise location of the portafilter which is crucial to ensure an efficient extraction.

In addition to allowing you effortlessly insert your portafilter the group head is responsible to maintain an even temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, making sure the temperature is always right for extraction. It is important to note that even a small deviation can make the difference between a good and excellent espresso.

The Pump

The motorized pumps used in rotary espresso machines supply the nine atmospheric bar pressure required for espresso extraction. This differs from manually operated piston machines that employ a lever. The pressure builds up by removing tap water from a reservoir, and pumping it through a heat exchanger prior being shot through the ground coffee inside the group head.

Pumps are generally more affordable and last longer than piston-driven machines. However, both kinds of machines may degrade due to excessive use and insufficient cleaning. Pumps are also more complex mechanically, which could increase prices of even simpler models.

Certain espresso machine uk machines utilize steam pressure instead of a pump to brew espresso. This can cause over-extraction because the boiler that produces steam also causes the water to boil. In addition these machines typically have to rebuild their pressure between cups, which takes time and energy.

Many espresso machines employ the rotary or vibration pump, which is a vibration model using a vibrating disc to create the pressure, and the rotary model pushing hot water through the grounds under high speed. Both machines produce great espresso, but rotary machines are more quiet, durable and less likely to break.

The Boiler

The boiler is what will heat the water to the perfect temperature to extract. The steam created is then directed to the portafilter, which holds the espresso grounds. The steam is then channeled into the cup. The steam is able to create enough pressure to push the coffee grounds through. This creates a crema on the top of the espresso. This is one of the main characteristics of a great espresso.

There are three types of espresso makers. They differ in the type of pump they employ and how hot the brew is. There are many ways to control the brew and the size of cup that can be produced by the machine.

The first espresso machines were steam-based. The first espresso machines were steam-type machines. This resulted in the coffee tasting bitter and burnt. The modern espresso machine was created by the Milanese manufacturers Luigi Bezzerra & Desiderio Pavoni.

The most popular travel espresso maker machine is a semiautomatic model with an electric pump. When people think of espresso machines, they picture these machines. Semi-automatic machines require you to grind and tamp the beans by yourself The pump, however, regulates the water flow and pressure. This is a great compromise between the human touch and the mechanised consistency.

The Filter

Espresso machines usually have a filter that separates the coffee espresso machine grounds from the hot water. The filter is also an important element of the temperature control system because it stops the machine from overheating.

Filters also aid in flavor as it allows for the beans to flower for a longer period of time. This allows beans to release their flavor and gives an opportunity for a better extraction.

It is important to keep in mind that even the finest filter can make a bad cup of coffee. The quality of the beans, and the extraction process are still very important.

It's here that the magic takes place. This is what makes espresso taste so good. The grouphead (also called the brewhead) is where you put the portafilter, the device that you use to put the coffee grounds into, when making espresso.

In a steam-driven espresso machine hot water is heated in an airtight tank to produce steam, which then pushes the hot water through the grounds with high pressure. These machines are less expensive and easier to maintain than pumps-driven models. They are however limited for creating the ideal conditions for brewing, as they operate with 1-1.5 bar of pressure. The perfect shot requires 9-10 bars.

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