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

How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to create the perfect cup of coffee. How does it work exactly?

To make an espresso, hot water is pushed under pressure through finely ground coffee. The process is similar to making drip coffee. However it is the pressure that makes the main difference.

The Head of the Group

As the name implies, the group head is the place you put your portafilter in when brewing espresso. It is responsible for dispersing water into the portafilter and controlling the pressure of the extraction. There are many different kinds of group heads each with its distinct advantages and drawbacks. Some are designed for stability in temperature, while others are specifically designed to handle pre-infusion. Some are designed to control the lever. There are even some that have a combination of features, like the E61 that is to be the most popular among baristas for its ability to offer multiple benefits in one package.

As you can see in the image above The group head features numerous notches that you can place your portafilter and then twist it with your hands to lock it in. There is also a gasket made of rubber in the notches and 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 efficient extraction.

The group head not only allows you to place your portafilter easily however, it also keeps the same temperature. It does this by circulating hot water through the brew container and around the portafilter, making sure that it's always at the correct temperature for extraction. This is crucial, since even a few degrees can make the difference between good and excellent espresso.

The Pump

Unlike manual piston machines, which rely on a lever that pressurize water, Rotary espresso machines rely on motorized pumps to provide the nine atmospheric bars of pressure needed to extract best espresso machine. The pressure builds up by removing tap water from a reservoir and pumping it through a heat exchanger prior being pushed through the ground coffee inside the group head.

Pumps tend to be cheaper than piston-driven machines, and they tend to last longer, however both types of machines can become damaged due to excessive use and poor cleaning. They also increase the complexity of mechanical systems, which can result in costly prices for even the simplest models.

Certain espresso machines can eliminate the pump completely and make use of steam pressure to make espresso. This can cause over-extraction because the boiler that produces steam also warms the water to boil. Additionally these machines are often required to rebuild their pressure between cups, which takes time and energy.

A majority of espresso machines utilize an rotary or a vibration pump. A vibration model makes use of a vibrating disk to generate pressure, whereas the Rotary model pushes hot coffee through the ground at a high speed. Both models can make a great espresso, but the rotary pumps are quieter, and more durable than vibration pumps.

The Boiler

The boiler is used to heat the water to the right temperature for extraction. The resulting steam reaches the portafilter, which contains ground espresso beans and gets funnelled down into the cup. In this process, the steam creates pressure and pushes through the grounds of the coffee. This produces a layer of crema that is then poured over. This is the hallmark of a great espresso.

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

The first espresso machines were steam-type. The earliest espresso machines were steam types. The coffee tasted bitter and burned. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern best espresso machine machine.

The most commonly used italian espresso machines machine is a semiautomatic with an electric pump. These are what people imagine when they think of an espresso maker. If you have a semi-automatic machine you must grind the beans and tamp them yourself but the pump is able to regulate the flow of water and pressure. This is a great compromise between human control and mechanized accuracy.

The Filter

Espresso machines typically have filters that separate the grounds of coffee from hot water. The filter is also a vital component of the machine's temp control, since it stops overheating.

It also aids in flavor, as it allows for a longer bloom phase. This allows the beans to release their nuances, and improves 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, as well as the extraction, are still very important.

This is where the magic happens, and it's what makes espresso taste great. The grouphead, sometimes called the brew head, is where the portafilter (the thing you put the ground coffee in) is placed when you're making espresso.

Steam-driven espresso machines make use of hot water that is heated in an airtight container to produce steam. The steam then pushes hot water into the grounds of coffee at high pressure. These types of machines are typically less expensive and easier to maintain than pumps-driven models. However, they are limited in their ability to produce the ideal conditions for brewing as they only operate at 1-1.5 bars of pressure. The perfect shot requires 9-10 bar.

In recent times, espresso machines powered by compressed air-pump are becoming increasingly popular. They utilize an air compressor to push hot water into the grounds and are significantly more portable than steam-driven electric machines.