9 Lessons Your Parents Taught You About Machine Espresso
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How Does Machine Espresso Work?
Machine espresso utilizes precise pressure and mind-blowing filter technology to create the coffee we love. How exactly does it work?
Espresso is produced by pushing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee but the difference is in the pressure.
The Group Head
As the name implies the group head is where you put your portafilter in when making italian espresso machines. It is responsible for dispersing water into the portafilter before controlling the pressure that results from the extraction. There are many different types of group heads each with distinct advantages and disadvantages. Some are focused on temperature stability, whereas others on pre-infusion options, and others are designed to control the lever. Some have a combination, like the E61. This is a favorite among baristas because it offers multiple benefits in one package.
As you can see from the above photo the group head is equipped with several notches. You place your portafilter in these notches, then turn the head around to secure it. There is also a gasket of rubber which is located inside the notches, which helps create an airtight seal after inserting 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 also maintains an even temperature. This is done by cycling hot water around the portafilter and through the brew-basket, making sure that the temperature is constant for extraction. This is vital, because even a few degrees can make the difference between a good and great espresso.
The Pump
Motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure required for espresso extraction. This differs from manually operated piston machines that employ levers. The pressure builds by removing tap water from a reservoir, and pumping it through a heat exchanger prior being pumped through the ground coffee inside the group head.
Pumps are typically less expensive than piston-driven machines, and they tend to last longer, however both types of machines may be damaged by excessive use and inadequate cleaning. They also add mechanical complexity which can result in an expensive price for even the simplest models.
Some espresso machines use steam pressure instead of a pump in order to brew espresso. This can cause over-extraction because the boiler that makes steam also heats the water until it comes to a boil. These machines also have to constantly rebuild their pressure between cups. This requires energy and time.
Many compact espresso machine machines make use of the rotary or vibration pump, with a vibrating model that uses a vibrating disc that generates the pressure, and the rotary model pushing hot water through the grounds at high speed. Both machines can make excellent espresso, however rotary machines are more stable, quieter and less likely to break.
The Boiler
The boiler is the part that heats the water to the optimal temperature for extraction. The steam that is produced reaches the portafilter containing the ground espresso coffee, and gets funnelled down into the cup. During this process, steam creates pressure and pushes through the coffee grounds. This results in a layer of crema on top. This is a hallmark of a great espresso.
There are three types of espresso makers. They differ in the type of pump they employ and the degree of heat that the coffee is. There are many ways to control the brew as well as the size of cup that can be made by the machine.
The first cheap espresso machine machines were steam-types. They employed a single boiler to make steam and brew, however the pressure they were able to generate was low - only two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.
The most popular espresso machine is a semiautomatic that has an electric pump. This is what people envision when they think of an espresso machine with frother machine. Semi-automatic machines require you to grind and tamp the beans yourself while the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy.
The Filter
Espresso machines typically use a filter that separates the grounds of coffee from hot water. The filter is also a vital part of the temperature control system since it helps prevent the machine from overheating.
Filters also aid in flavor, as it permits the beans to flower for a longer period of time. This helps the beans to let their nuances out and provides an opportunity for a better extraction.
It is important to remember that even the best filter can produce a bad cup of coffee. The quality of the beans, and the extraction process remain vital.
This is where the magic happens, and it's what makes espresso taste great. The grouphead, often referred to as the brewhead, is where the portafilter (the thing you put the coffee ground into) sits when you're making espresso.
Steam-driven espresso machines use hot water heated in an airtight container to produce steam. The steam then pushes hot water through the grounds of coffee at high pressure. These machines are cheaper and easier for the owner to maintain than pumps-driven models. They are however limited in their ability 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, compressed air-driven espresso machines have been gaining popularity. They utilize an air compressor to force hot water through the grounds and are more portable than steam-driven electric machines.
Machine espresso utilizes precise pressure and mind-blowing filter technology to create the coffee we love. How exactly does it work?
Espresso is produced by pushing hot water under high pressure through finely-ground coffee. The process is similar to making drip coffee but the difference is in the pressure.
The Group Head
As the name implies the group head is where you put your portafilter in when making italian espresso machines. It is responsible for dispersing water into the portafilter before controlling the pressure that results from the extraction. There are many different types of group heads each with distinct advantages and disadvantages. Some are focused on temperature stability, whereas others on pre-infusion options, and others are designed to control the lever. Some have a combination, like the E61. This is a favorite among baristas because it offers multiple benefits in one package.
As you can see from the above photo the group head is equipped with several notches. You place your portafilter in these notches, then turn the head around to secure it. There is also a gasket of rubber which is located inside the notches, which helps create an airtight seal after inserting 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 also maintains an even temperature. This is done by cycling hot water around the portafilter and through the brew-basket, making sure that the temperature is constant for extraction. This is vital, because even a few degrees can make the difference between a good and great espresso.
The Pump
Motorized pumps in espresso machines that rotate provide the nine atmospheric bar pressure required for espresso extraction. This differs from manually operated piston machines that employ levers. The pressure builds by removing tap water from a reservoir, and pumping it through a heat exchanger prior being pumped through the ground coffee inside the group head.Pumps are typically less expensive than piston-driven machines, and they tend to last longer, however both types of machines may be damaged by excessive use and inadequate cleaning. They also add mechanical complexity which can result in an expensive price for even the simplest models.Some espresso machines use steam pressure instead of a pump in order to brew espresso. This can cause over-extraction because the boiler that makes steam also heats the water until it comes to a boil. These machines also have to constantly rebuild their pressure between cups. This requires energy and time.
Many compact espresso machine machines make use of the rotary or vibration pump, with a vibrating model that uses a vibrating disc that generates the pressure, and the rotary model pushing hot water through the grounds at high speed. Both machines can make excellent espresso, however rotary machines are more stable, quieter and less likely to break.
The Boiler
The boiler is the part that heats the water to the optimal temperature for extraction. The steam that is produced reaches the portafilter containing the ground espresso coffee, and gets funnelled down into the cup. During this process, steam creates pressure and pushes through the coffee grounds. This results in a layer of crema on top. This is a hallmark of a great espresso.
There are three types of espresso makers. They differ in the type of pump they employ and the degree of heat that the coffee is. There are many ways to control the brew as well as the size of cup that can be made by the machine.
The first cheap espresso machine machines were steam-types. They employed a single boiler to make steam and brew, however the pressure they were able to generate was low - only two bars of atmospheric pressure at the most. The coffee tasted bitter and burned. This is why the Milanese makers Luigi Bezzerra and Desiderio Pavoni developed the modern espresso machine.
The most popular espresso machine is a semiautomatic that has an electric pump. This is what people envision when they think of an espresso machine with frother machine. Semi-automatic machines require you to grind and tamp the beans yourself while the pump controls the flow of water and pressure. This is an excellent compromise between human touch and the mechanised accuracy.
The Filter
Espresso machines typically use a filter that separates the grounds of coffee from hot water. The filter is also a vital part of the temperature control system since it helps prevent the machine from overheating.
Filters also aid in flavor, as it permits the beans to flower for a longer period of time. This helps the beans to let their nuances out and provides an opportunity for a better extraction.
It is important to remember that even the best filter can produce a bad cup of coffee. The quality of the beans, and the extraction process remain vital.
This is where the magic happens, and it's what makes espresso taste great. The grouphead, often referred to as the brewhead, is where the portafilter (the thing you put the coffee ground into) sits when you're making espresso.
Steam-driven espresso machines use hot water heated in an airtight container to produce steam. The steam then pushes hot water through the grounds of coffee at high pressure. These machines are cheaper and easier for the owner to maintain than pumps-driven models. They are however limited in their ability 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, compressed air-driven espresso machines have been gaining popularity. They utilize an air compressor to force hot water through the grounds and are more portable than steam-driven electric machines.
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