12 Companies Leading The Way In Machine Espresso > 자유게시판

How Does Machine Espresso Work?

Machine espresso utilizes precise pressure and mind-blowing filter technology to make the delicious coffee we enjoy. What exactly is it?

In order to make espresso, hot water is forced under high pressure through finely ground coffee. The process is similar to making drip coffee. However the pressure is the major difference.

The Group Head

The name implies the group head is the place you insert your portafilter when brewing espresso. It is responsible for dispersing water into the portafilter, and controlling the pressure that results from the extraction. There are a variety of types of group heads, each with their unique advantages and drawbacks. Some are designed to provide temperature stability while others are built to handle pre-infusion. Some are designed to control the lever. Some include a combination like the E61. This is a popular choice among baristas due to the fact that it has multiple advantages in a single package.

As you can see in the above image, the group head has numerous notches that you can place your portafilter before twisting it manually to lock it in. A gasket of rubber is situated inside the notches to help create a seal when you insert your portafilter. The notches on the head permit a precise position of the portafilter which is essential to ensure an efficient extraction.

The group head not only lets you to insert your portafilter easily however, it also keeps an even temperature. This is done by cycling hot water around the portafilter, compact espresso machine and through the brew-basket, espresso Coffee machines making sure that the temperature is constant for extraction. This is vital, because even a few degrees can make the difference between excellent and great espresso.

The Pump

The motorized pumps in rotary espresso machines provide the nine atmospheric bar pressure needed for espresso extraction. This is different from manually operated piston machines that employ a lever. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee.

Pumps tend to be cheaper than piston-driven models, and they tend to last longer, although both types of machine can get damaged through overuse and lack of cleaning. They also make mechanically complex which can result in a high price tag on even the most basic models.

Certain retro espresso maker machines utilize steam pressure instead of a pump in order to brew espresso. The drawback of this is that the same boiler that produces steam also increases the temperature of the water until it reaches boiling which can cause excessive extraction. The machines must also constantly rebuild their pressure between cups. This requires energy and time.

Many espresso machines make use of the rotary or vibration pump. A vibration model employs the vibrating disk to create pressure, whereas the circular model pushes hot liquid through the ground at high speed. Both machines produce great espresso, but rotary machines are more quiet, durable and less likely to fail.

The Boiler

The boiler is the one that heats the water to a temperature that is ideal for extraction. The resultant steam then reaches the portafilter, which contains the ground espresso coffee, and is then funneled down into the cup. In this process, the steam creates pressure and pushes through the grounds of the coffee. This results in a layer crema on top. This is a hallmark of a great espresso.

There are three types of espresso makers, which differ in the type of pump they use and the degree of heat that the espresso is. There are a variety of ways in which the brew can be controlled and the dimensions of the cup the maker can create.

The earliest espresso machines were steam types. The earliest espresso coffee machines for sale machines were steam-type machines. The coffee tasted bitter and burned. The modern espresso machine was designed by the Milanese producers Luigi Bezzerra & Desiderio Pavoni.

The most well-known espresso maker is a semi-automatic device that has an electric pump. This is what people envision when they think of an espresso machine. Semi-automatic machines require you to grind and tamp the beans by yourself while the pump controls the water flow and pressure. This is an excellent compromise between human touch and the mechanised quality.

The Filter

Typically, espresso machines have filters to separate the grounds of coffee when they pass through the hot water. The filter is also a crucial element of the temperature control system since it helps prevent the machine from overheating.

A filter also improves flavor since it allows for the beans to flower for a longer period of time. This helps the beans release their flavors and provides an opportunity for a better extraction.

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

It's in this area that the magic happens. This is the reason why compact espresso machine (Fkwiki says) tastes so delicious. The grouphead (also known as the brewhead) is where you put the portafilter - the thingy that you put the grounds of coffee into when making espresso.

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

In recent years, compressed air-pump-driven espresso machines have been gaining popularity. They utilize an air compressor to push the hot water through the grounds and are more portable than steam-driven electric machines.