It's The Ugly Real Truth Of Machine Espresso
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How Does Machine Espresso Work?
Machine espresso makes use of precise pressure and incredible filter technology to produce the coffee we love. 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 that of making drip coffee. However the pressure is the major difference.
The Head of the Group
The group head is the portafilter you put in when making cheap espresso machine. It is responsible for dispersing water into the portafilter and then controlling the pressure of the extraction. There are a variety of types of group head, each with their particular advantages and drawbacks. Some are designed for stability of temperature while others are specifically designed to handle pre-infusion. Some are designed to control the lever. Some include a combination like the E61. This is a preferred choice for baristas since it provides multiple advantages in one package.
As you can see from the above photo the group head is equipped with several notches. It is possible to place your portafilter in these notches, then twist the head to secure it. There is also a gasket made of rubber that resides inside the notches and helps create a seal when you insert your portafilter into the machine. The notches on the head permit a precise location of the portafilter which is necessary to ensure an efficient extraction.
Aside from allowing you to easily place your portafilter in, the group head is responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is at the right level for extraction. This is vital, because even a few degrees can make the difference between a good and great espresso.
The Pump
The motorized pumps used in rotary espresso machines supply the nine atmospheric bar pressure required to extract espresso. This is different from manual piston machines that rely on a lever. 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 can get damaged through overuse and lack of cleaning. They also add mechanical complexity that can lead to the cost of even the most basic models.
Some espresso machines can eliminate the pump entirely and use steam pressure to brew espresso. The downside is that the boiler that produces steam also raises the temperature of water until it reaches boiling, which can lead to over-extraction. Additionally these machines typically have to restore their pressure between cups, which requires time and energy.
A majority of espresso machines use an rotary or vibrating pump, with a vibration model that uses a vibrating disc to generate the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both machines can make excellent espresso, but rotary machines are quieter, more durable and less likely to fail.
The Boiler
The boiler makes the water warm to the perfect temperature for extraction. The resulting steam reaches the portafilter that contains the ground espresso coffee, and is then funneled down into the cup. During this process, the steam causes pressure to push through the grounds of the coffee. This creates a crema on the top espresso machines of the professional espresso machine for home. This is one of the hallmarks of a good espresso coffee machines for sale.
There are three types of espresso coffee machines for sale makers, and they differ in the type of pump they employ and how hot the brew is. There are a variety of ways to control the strength of the brew and the size of the cup that can be made by the machine.
The first espresso machines were steam-type. The earliest espresso machines were steam types. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso machine is a semiautomatic that has an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic machine you grind the beans and tamp them yourself but the pump provides regulated water flow and pressure. This is a great combination of human control and mechanized consistency.
The Filter
Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also an essential part of the temperature control system, since it helps prevent the machine from overheating.
A filter also helps with flavor as it allows for a longer flowering period. This allows the beans to let their nuances out, and improves extraction.
However, it is important to remember that even a good filter could result in a bad cup of coffee as the quality of the beans and extraction is essential.
This is where the magic happens, it's the thing that makes an espresso really taste good. The grouphead (also called the brewhead) is where you place the portafilter, the device that you use to put the grounds of your coffee into while making espresso.
Steam-driven mini espresso machine machines use hot water that is heated inside an airtight vessel to create steam. The steam then pushes hot water through the grounds of the coffee under pressure. These kinds of machines are usually less expensive and easier to maintain than pumps-driven models. They are however limited in their ability 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 use an air compressor to push hot water across the ground, and are more mobile than steam-driven electric espresso machines.
Machine espresso makes use of precise pressure and incredible filter technology to produce the coffee we love. 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 that of making drip coffee. However the pressure is the major difference.
The Head of the Group
The group head is the portafilter you put in when making cheap espresso machine. It is responsible for dispersing water into the portafilter and then controlling the pressure of the extraction. There are a variety of types of group head, each with their particular advantages and drawbacks. Some are designed for stability of temperature while others are specifically designed to handle pre-infusion. Some are designed to control the lever. Some include a combination like the E61. This is a preferred choice for baristas since it provides multiple advantages in one package.
As you can see from the above photo the group head is equipped with several notches. It is possible to place your portafilter in these notches, then twist the head to secure it. There is also a gasket made of rubber that resides inside the notches and helps create a seal when you insert your portafilter into the machine. The notches on the head permit a precise location of the portafilter which is necessary to ensure an efficient extraction.
Aside from allowing you to easily place your portafilter in, the group head is responsible for maintaining a consistent temperature. This is done by cycling hot water around the portafilter, and through the brew-basket, ensuring that the temperature is at the right level for extraction. This is vital, because even a few degrees can make the difference between a good and great espresso.
The Pump
The motorized pumps used in rotary espresso machines supply the nine atmospheric bar pressure required to extract espresso. This is different from manual piston machines that rely on a lever. 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 can get damaged through overuse and lack of cleaning. They also add mechanical complexity that can lead to the cost of even the most basic models.
Some espresso machines can eliminate the pump entirely and use steam pressure to brew espresso. The downside is that the boiler that produces steam also raises the temperature of water until it reaches boiling, which can lead to over-extraction. Additionally these machines typically have to restore their pressure between cups, which requires time and energy.
A majority of espresso machines use an rotary or vibrating pump, with a vibration model that uses a vibrating disc to generate the pressure, and an rotary model that pushes hot water through the grounds under high speed. Both machines can make excellent espresso, but rotary machines are quieter, more durable and less likely to fail.
The Boiler
The boiler makes the water warm to the perfect temperature for extraction. The resulting steam reaches the portafilter that contains the ground espresso coffee, and is then funneled down into the cup. During this process, the steam causes pressure to push through the grounds of the coffee. This creates a crema on the top espresso machines of the professional espresso machine for home. This is one of the hallmarks of a good espresso coffee machines for sale.
There are three types of espresso coffee machines for sale makers, and they differ in the type of pump they employ and how hot the brew is. There are a variety of ways to control the strength of the brew and the size of the cup that can be made by the machine.
The first espresso machines were steam-type. The earliest espresso machines were steam types. This resulted in the coffee tasting burnt and bitter. The modern espresso machine was developed by the Milanese makers Luigi Bezzerra & Desiderio Pavoni.
The most commonly used espresso machine is a semiautomatic that has an electric pump. These are what people imagine when they imagine an espresso machine. With a semi-automatic machine you grind the beans and tamp them yourself but the pump provides regulated water flow and pressure. This is a great combination of human control and mechanized consistency.The Filter
Typically, espresso machines employ filters to separate the grounds of the coffee as they go through the hot water. The filter is also an essential part of the temperature control system, since it helps prevent the machine from overheating.
A filter also helps with flavor as it allows for a longer flowering period. This allows the beans to let their nuances out, and improves extraction.
However, it is important to remember that even a good filter could result in a bad cup of coffee as the quality of the beans and extraction is essential.
This is where the magic happens, it's the thing that makes an espresso really taste good. The grouphead (also called the brewhead) is where you place the portafilter, the device that you use to put the grounds of your coffee into while making espresso.
Steam-driven mini espresso machine machines use hot water that is heated inside an airtight vessel to create steam. The steam then pushes hot water through the grounds of the coffee under pressure. These kinds of machines are usually less expensive and easier to maintain than pumps-driven models. They are however limited in their ability 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 use an air compressor to push hot water across the ground, and are more mobile than steam-driven electric espresso machines.
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