업체명	WG	이름	Trudi
연락처	NQ	이메일	trudietheridge@yahoo.com
모델명(모델번호)	JT	설치(구매)일자
수리의뢰내역 제품의 증상
How Does Machine Espresso Work? Machine espresso makes use of precise pressure and mind-blowing filter technology to create the coffee we love. What exactly is it? 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 group head is the portafilter you put in when making espresso. It disperses the water into the portafilter, and regulates the pressure of extraction. There are many different types of group heads each with their own advantages and disadvantages. Some are focused on temperature stability, whereas others on pre-infusion features, and others are designed to control the lever. There are also some that come with a range of features, such as the E61, which is the most popular choice among baristas for its ability to offer multiple benefits in one package. As you can see in the above photo the group head comes with several notches where you place your portafilter and then twist it with your hands to secure it. A gasket made of rubber is positioned within the notches to create a seal as you insert your portafilter. The notches permit the precise placement of the portafilter. This is vital for an even extraction. Apart from allowing you easily place your portafilter in, the group head is responsible for maintaining an even temperature. It does this by cycling hot water through the brew container and around the portafilter, machine Espresso ensuring that it is always at the correct temperature for extraction. It is important to remember that even a small difference can make the difference between a decent and a excellent espresso. The Pump In contrast to manual piston machines that use a lever to pressurize water, rotating espresso machines rely upon motorized pumps that provide the nine atmospheric bars of pressure necessary to extract espresso. The pressure is created by pumping water through a heat-exchanger and then through the ground coffee. Pumps tend to be less expensive than piston-driven machines, and they tend to last longer, although both types of machines may become damaged due to excessive use and poor cleaning. Pumps are also more complicated mechanically, which can increase prices of even simple models. Some espresso machines eliminate the pump completely and instead employ steam pressure to create espresso. This could lead to over-extraction since the boiler that makes steam also warms the water to boil. These machines also have to continually rebuild their pressure between cups. This requires energy and time. A majority of espresso machines use the rotary or vibration pump, which has a vibration model using a rotating disc that generates the pressure, and rotating models that push hot water through the grounds under 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 the component that heats water to an ideal temperature to extract. The resulting steam reaches the portafilter containing ground espresso beans and is then funneled down into the cup. In this process, the steam creates pressure that pushes through the grounds of the coffee. This results in a layer of crema on top. This is the hallmark of a good espresso. There are three distinct types of espresso machines, each having different pumps and the temperature of the brew. There are various ways to control the strength of the brew and the size of cup that can be produced by the machine. The first espresso home machine machines were steam types. The earliest espresso machines were steam-type machines. The coffee tasted bitter and burned. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni created the modern espresso machine. The most well-known espresso maker is a semi-automatic one that has an electric pump. When people think of best espresso maker machines, they envision these machines. With a semi-automatic machine you must grind the beans and tamp them by hand. The pump is able to regulate the flow of water and pressure. This is a great compromise between the human touch and mechanized quality. The Filter Typically, espresso machines employ filters to separate the coffee grounds as they pass through the hot water. The filter is also a vital component of the machine's temp control, since it helps to prevent overheating. It also improves flavor, as a filter can allow for a longer bloom time. This allows beans to let their nuances out and provides an opportunity for better extraction. It is important to keep in mind that even the most efficient filter can result in a bad cup of coffee. The quality of the beans as well as the extraction, are still crucial. It's here that the magic takes place. This is the reason why espresso tastes so delicious. The grouphead, also referred to as the brew head, is where the portafilter (the container you place the coffee grounds into) is located when you're making espresso. In a steam-driven espresso machine, hot water is heated in an airtight tank to create steam, which is then pushed through the grounds at a high pressure. These types of machines are generally less expensive and simpler to maintain than pumps-driven models. They are however limited in their ability for creating the ideal conditions for brewing since they only operate with 1-1.5 bar of pressure. The ideal shot requires 9-10 bars. In recent years, espresso machines driven by a compressed air compressor have become increasingly popular. They use an air compressor to push hot water into the grounds and are much more portable than electric steam-driven machines.