This Week's Top Stories About Machine Espresso > 자유게시판

How Does Machine Espresso Work?

The machine espresso uses precise pressure, as well as a filter technology that is awe-inspiring to make the coffee you love. What exactly does it work?

Espresso is made by pushing 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 the place you put your portafilter in when making espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure that results from the extraction. There are numerous kinds of group heads each with their own advantages and drawbacks. Some are specifically designed for the stability of temperature while some are designed to handle pre-infusion. Some are designed to control the lever. Some are a combination, like the E61. This is a very popular choice for baristas due to the fact that it has multiple benefits in a single package.

As you can see in the photo above, the group head is fitted with a variety of notches. The portafilter is placed into these notches and twist the head to lock it. There is also a gasket of rubber that resides inside the notches and helps create a 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.

The group head does not just allow you to insert your portafilter easily, but it also maintains an even temperature. It does this by cycling hot water through the brew basket, and around the portafilter to ensure that it is always at the right temperature to extract. This is important because just a few degrees could make the difference between a good and great espresso.

The Pump

The motorized pumps used in espresso machines that rotate provide the nine atmospheric bar pressure that is required to extract espresso. This differs from manual piston machines that rely on a lever. The pressure is created by drawing tap water from a reservoir, and pumping it through a heat exchanger prior espressomachines to being shot through the ground coffee in the group head.

Pumps tend to be more affordable and last longer than piston-driven machines. However, both types of machines can degrade because of excessive use and insufficient cleaning. Pumps are also more complex mechanically, which can raise the cost of even the most basic models.

Certain espresso machines utilize steam pressure instead of a pump in order to brew espresso. The downside is that the same boiler that produces steam also increases the temperature of water to the point of boiling which can cause over-extraction. These machines also have to continually rebuild their pressure between cups. This requires energy and time.

Many espresso machines make use of an rotary or a vibration pump. A vibration model makes use of an oscillating disk best bean to cup espresso machine create pressure, whereas a rotating model pushes hot water through the ground at high speed. Both types of machine can produce an excellent espresso, however the rotary models are quieter and more durable than vibration pumps.

The Boiler

The boiler is the part that heats the water to the ideal temperature to extract. The steam that is produced reaches the portafilter that contains the ground espresso coffee, and gets funnelled down into the cup. During this process the steam causes enough pressure to push the grounds of coffee through. This creates a layer crema that is then poured over. This is one of the hallmarks of a good espresso machines home.

There are three kinds of espresso makers. They differ in the type of pump they employ and the degree of heat that the coffee is. There are a variety of ways in which the brew can be controlled and the size of the cup that the machine can make.

The first espresso machines were steam types. The earliest discount espresso machines machines were steam-type machines. This led to the coffee tasting burnt and bitter. The modern espresso machine was created by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.

The most commonly used espresso maker is a semiautomatic machine with an electric pump. When people think of espresso machines, they picture these machines. With a semi-automatic espresso machine, you have to grind the beans and tamp them by hand. The pump regulates the flow of water and pressure. This is an excellent compromise between human touch and the mechanized accuracy.

The Filter

Espresso machines usually have filters that separate the grounds of the coffee from the hot water. The filter is also a vital element of the machine's temperature control, since it helps to prevent overheating.

It also aids in flavor, since a filter allows for a more prolonged bloom time. This allows the beans to release their flavors, and allows for better extraction.

However, it is important to remember that even a good filter can result in a poor cup of coffee, since the quality of the beans and extraction are essential.

This is where the magic happens, and it's what makes an espresso really taste good. The grouphead, often called the brewhead, is where the portafilter (the device you put the coffee ground into) is placed when making espresso.

In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam. Steam is then pushed through the grounds under high pressure. They are less expensive and easier for the owner to maintain than pumps-driven models. However, they are not as efficient 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 9-10 bar.

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