• 목록
• 답변
• 글쓰기
• 게시판 리스트 옵션
  • 수정
  • 삭제

How Does Machine Espresso Work?

Machine espresso uses precision pressure and incredible filter technology to produce the perfect cup of coffee. What exactly is it that makes it work?

espresso coffee makers is created by forcing hot water 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 group head is the portafilter you insert when brewing espresso. It disperses the water into the portafilter, and then regulates the pressure of extraction. There are numerous kinds of group heads each with distinct advantages and disadvantages. Some are specifically designed for stability of temperature while others are built to handle pre-infusion. Others are made to control the lever. Some are a combination, such as the E61. This is a preferred choice for baristas because it offers multiple benefits in a single package.

As you can see in the above image The group head features several notches to place your portafilter and twist it manually to secure it. A gasket made of rubber is placed inside the notches, which helps make a seal when you insert your portafilter. The notches allow for precise placement of your portafilter. This is crucial for an accurate extraction.

In addition to allowing you easily connect your portafilter, the group head is responsible to ensure that the temperature remains even. This is accomplished by cycling hot water around the portafilter and through the brew basin, ensuring that the temperature is constant for extraction. It is important to remember that even a tiny differences can make the distinction between a good and excellent espresso and filter coffee machine.

The Pump

In contrast to piston machines that are manually operated, which rely on a lever that pressurize water, the rotary espresso machines use motorized pumps to deliver the nine atmospheric bars of pressure required for espresso extraction. The pressure builds up by drawing tap water from a reservoir, and pumping it through a heat exchanger before being pumped through the ground coffee in the group head.

Pumps tend to be less expensive and last for longer than piston-driven machines. However, both kinds of machines can deteriorate due to overuse and poor cleaning. They also create mechanical complexity that can lead to a high price tag on even the most basic models.

Certain espresso machines eliminate the pump completely and utilize steam pressure to make espresso. The drawback of this is that the same boiler that produces steam also raises the temperature of water to the point of boiling and can result in excessive extraction. These machines also have to continuously rebuild their pressure between cups. This takes energy and time.

Many espresso machines use either a vibration or rotary pump. A vibration model employs an oscillating disk to create pressure, whereas a rotating model pushes hot water through the ground at a fast speed. Both machines can produce excellent espresso, but rotary machines are more stable, quieter and less likely to break down.

The Boiler

The boiler is the one that heats the water to the ideal temperature to extract. The resultant steam then reaches the portafilter containing the ground espresso coffee, and is then funneled down into the cup. The steam is able to create enough pressure to push the grounds of coffee through. This produces a layer of crema on top. This is a sign of a great espresso.

There are three kinds of espresso makers. They differ in the type of pump they use and the degree of heat that the espresso is. There are different ways that the brew can be controlled as well as the size of the cup that the machine can produce.

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

The most popular espresso machine is a semiautomatic model with an electric pump. When people think of espresso machines, they imagine these machines. With a semi-automatic machine you grind the beans and tamp them by hand. However, the pump regulates the flow of water and pressure. This is a great compromise between the human touch and the mechanised quality.

The Filter

Typically, espresso machines utilize a filter to separate out the grounds of coffee as they move through the hot water. The filter is also a vital part of the machine's temperature control, as it prevents overheating.

A filter also helps with flavor as it allows for a longer flowering phase. This lets the beans let their nuances out, and also allows for better extraction.

It is important to remember that even the finest filter could result in a poor cup of coffee. The quality of the beans and the extraction, remain crucial.

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

Steam-driven espresso machines make use of hot water that is heated in an airtight container to create steam. The steam then pushes hot water through the grounds of the coffee under pressure. These machines are less expensive and easier for the user to maintain than pumps-driven models. They are however limited to create 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 powered by a compressed air pump have become increasingly popular. They use an air compressor to push hot water through the grounds and are significantly more portable than electric steam-driven machines.