Espresso machine
Encyclopedia
An espresso machine is used to produce the traditional Italian
Italy
Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

 coffee
Coffee
Coffee is a brewed beverage with a dark,init brooo acidic flavor prepared from the roasted seeds of the coffee plant, colloquially called coffee beans. The beans are found in coffee cherries, which grow on trees cultivated in over 70 countries, primarily in equatorial Latin America, Southeast Asia,...

 beverage called espresso
Espresso
Espresso is a concentrated beverage brewed by forcing a small amount of nearly boiling water under pressure through finely ground coffee. Espresso is widely known throughout the world....

.

History

The first machine for making espresso was built and patented by Angelo Moriondo
Angelo Moriondo
Angelo Moriondo was one of the most important 19th Century contributors to the development of the espresso coffee machine...

 of Turin
Turin
Turin is a city and major business and cultural centre in northern Italy, capital of the Piedmont region, located mainly on the left bank of the Po River and surrounded by the Alpine arch. The population of the city proper is 909,193 while the population of the urban area is estimated by Eurostat...

, Italy, who demonstrated a working example at the Turin General Exposition of 1884. He was granted patent no. 33/256 dated 16th May 1884 (according to the “Bollettino delle privative industriali del Regno d’Italia”, 2nd Series, Volume 15, Year 1884, pages 635 – 655). A certificate of industrial title was awarded to Mr. Moriondo Angelo, of Turin, for an invention called “New steam machinery for the economic and instantaneous confection of coffee beverage, method ‘A. Moriondo’, Plate CXL".

In 1901 Luigi Bezzera of Milan patented improvements to the machine. Bezzera was not an engineer, but a mechanic. He patented a number of improvements to the existing machine, the first of which was applied for on the 19th of December 1901. It was titled “Innovations in the machinery to prepare and immediately serve coffee beverage” (Patent No. 153/94, 61707, granted on the 5th of June 1902). In 1905 the patent was bought by Desiderio Pavoni who founded the “La Pavoni” company and began to produce the machine commercially (one a day) in a small workshop in Via Parini in Milan
Milan
Milan is the second-largest city in Italy and the capital city of the region of Lombardy and of the province of Milan. The city proper has a population of about 1.3 million, while its urban area, roughly coinciding with its administrative province and the bordering Province of Monza and Brianza ,...

.

Drive mechanism

Since their invention in 1901, multiple machine designs have been created to produce espresso. Several machines share some common elements.

Varying the fineness of the grind, the amount of pressure used to tamp the grinds, or the pressure itself can be used to vary the taste of the espresso. Some baristas pull espresso shots directly into a pre-heated demitasse
Demitasse
A demitasse is a small cup used to serve Arabic coffee or espresso. In some languages it is called fincan, fildžan, filxhan or φλιτζάνι . In Spanish, it is called a pocillo....

 cup or shot glass, to maintain a higher temperature of the espresso.

An espresso machine may also have a steam wand which is used to steam and froth liquids, to include milk, for beverages such as the cappuccino
Cappuccino
A cappuccino is an Italian coffee drink prepared with espresso, hot milk, and steamed-milk foam. The name comes from the Capuchin friars, referring to the colour of their habits.- Definition :...

 and latte
Latte
A latte is a coffee drink made with espresso and steamed milk. Variants include replacing the coffee with another drink base such as masala chai, mate or matcha...

.

Steam-driven

A steam-driven unit operates by forcing water through the coffee by using steam or steam pressure. The first espresso machines were steam types, produced when a common boiler was piped to four group heads so that multiple types of coffee could be made at the same time. The design is still used today in low-cost consumer machines, as it does not need to contain moving parts.

Piston-driven

The piston, or lever, driven machine was developed in Italy in 1945 by Achille Gaggia, founder of espresso machine manufacturer Gaggia
Gaggia
Gaggia is an Italian company that makes coffee machines, especially espresso and cappuccino machines, in addition to small kitchen appliances...

. The design generically uses a lever, pumped by the operator, to pressurize hot water and send it through the coffee grinds. The act of producing a shot of espresso is colloquially termed pulling a shot, because these lever-style espresso machines required pulling a long handle to produce a shot.

There are two types of lever machines; manual piston and spring piston design. With the manual piston, the operator directly pushes the water through the grounds. In the spring piston design, the operator works to tension a spring, which then delivers the pressure for the espresso (usually 8 to 10 bar
Bar (unit)
The bar is a unit of pressure equal to 100 kilopascals, and roughly equal to the atmospheric pressure on Earth at sea level. Other units derived from the bar are the megabar , kilobar , decibar , centibar , and millibar...

).

Pump-driven

A refinement of the piston machine is the pump-driven machine, which was introduced in the Faema
Faema
FAEMA primarily engaged in the production of espresso machines, was founded in 1945 by Carlo Ernesto Valente, in Milan, Italy....

 E61 in 1961, and has become the most popular design in commercial espresso bars. Instead of using manual force, a motor-driven pump provides the force necessary for espresso brewing. Commercial or some high-end home machines are often attached directly to the plumbing of the site; lower-end home machines have built-in water reservoirs.

Four variants exist in home machines, depending on how brew water and steam are boiled; in discussion these are generally known by acronyms.
Single Boiler (SB): These machines can brew only, and not steam, requiring only a single boiler. They are relatively uncommon, with steam wands being a simple and valued addition.
Single Boiler, Dual Use (SB/DU): Some home pump espresso machines use a single chamber both to heat water to brewing temperature and to boil water for steaming milk. Since the temperature for brewing is less than the temperature for creating steam the machine requires time to make the transition from one mode to the other.
Heat Exchanger (HX): Some machines use a single boiler kept at steaming temperature, but water for brewing is passed through a heat exchanger, taking some heat from the steam without rising to the same temperature. This is found in many mid-range machines. There is some controversy as to the temperature stability of the brewing water, since it is indirectly converted from steaming temperature to brewing temperature, rather than kept at a brewing temperature.
The first HX was the Faema E61 of 1961.

Dual Boiler (DB): Finally, in some espresso machines for commercial or home use, water for brewing is heated in a separate chamber, which requires two separate boilers. This is found primarily in higher-end machines, though it is also found in some mid-range machines, overlapping with HX.
The term "Dual Boiler" is used narrowly for machines with two separate boilers, and more broadly for what are more properly called "Dual Heater" (DH) machines, featuring a boiler for brewing and a separate thermoblock (TB) for heating brew water to steaming temperature – opposite to HX machines, where the boiler is at steaming temperature and is cooled to brewing temperature.
In principle, TB machines yield stabler brew temperatures at the expense of steaming performance and speed, while HX machines yield better steaming at the expense of stable brew temperature. True DB machines provide stable brew temperatures and fast steaming, but are larger and more expensive.
The first DB was the La Marzocco
La Marzocco
La Marzocco is an Italian maker of espresso machines, and its machines are consistently considered in the top rank, particularly since the introduction of the dual-boiler GS series in 1970, and its machines are widely used in specialty coffee shops...

 GS of 1970.

Air-Pump-driven

In recent years air-pump driven espresso machines have emerged. These machines use compressed air to force the hot water through the coffee grounds. The hot water is typically added from a kettle or a thermo flask. The compressed air comes from either a hand-pump, N20 or CO2 cartridges or an electric compressor. One of the advantages of the air-pump driven machines is that they are much smaller and lighter than electric machines. They are often handheld and portable. The first air-pump driven machine was Handpresso
Handpresso
Handpresso SARL is a French manufacturer of portable espresso machines. Founded in Fontainebleau in 2006 by Henrik Nielsen as a spin-off from Nielsen Innovation SARL. Handpresso has created and patented the World's first handheld espresso maker, Handpresso WILD ESE, which is sold in 25 countries....

 Wild, which was invented by Nielsen Innovation SARL, a French innovation house, and introduced in 2007. California-based Espressi Inc introduced a gas-cartridge powered espresso maker called the mypressi TWIST in 2009.

Automation

Machines that have pumps, sensors, valves, and grinders to automate the brewing process are generally referred to as automatic.
  • Semi-automatic use a pump rather than manual force to deliver water. The remaining brew pressure in the basket is released via a three-way valve.
  • Automatic machines also automate the brewed volume (hence indirectly brew time). They do this by adding an in-line flowmeter to the grouphead: when the programmed amount of water has passed through the meter, the pump turns off. Grinding and tamping are still manual.
  • Super-automatic machines automatically grind the coffee, tamp it, and extract the espresso shot. The operator only has to fill the bean hopper and, if the machine is not connected to a water line, add water to a reservoir. Some models contain an automated milk frothing and dispensing device. Super-automatic machines take away the ability to manually tamp and grind the coffee, which may affect the quality of the espresso.


Commercial establishments generally use semi-automatic machines with several group heads. These are much larger than consumer models and able to produce espresso shots more quickly. Many commercial machines can function in an automatic mode.

Manual or semi-automatic machines offer more control of shot quality. Because when to cut the shot (brew time) is a critical variable, which is often adjusted shot-by-shot, semi-automatic machines are often preferred over automatics, though some high-quality machines are automatic. Manual machines are more popular in Europe, where it is more common to drink straight espresso.

Most super-automatic machines cannot handle a high volume and require more maintenance, making them unpopular in commercial applications. They produce very little counter mess, though, and are more compact than a machine with a separate grinder.

Super-automatic machines are generally considered to produce inferior quality to a trained barista, but superior quality to an incompetent barista, and greater consistency. Further, super-automatic machines require less skilled, indeed virtually unskilled operators, which cuts expenses on worker training, which is a significant concern in environments with high staff turn-over.

Stove top

Moka pots, also known as stove top espresso makers, are similar to espresso machines in that they brew under pressure and the resulting brew shares some similarities, but in other respects differ. As such, their characterization as "espresso" machines is at times contentious, but due to their use of pressure and steam for brewing, comparable to all espresso prior to the 1948 Gaggia, they are accepted within broader uses of the term, but distinguished from standard modern espresso machines.

Moka pots are similar to espresso machines in that they brew under pressure, produce coffee with an extraction ratio similar to that of a conventional espresso machine, and, depending on bean variety and grind selection, Moka pots can create the same foam emulsion known as crema that conventional espresso machines can.

Moka pots differ from espresso machines in that they brew under substantially lower pressure – 1.5 bars rather than 9 bars – and use hotter water – a mix of boiling water and steam at above 100°C (rather than 92°–96° of espresso machines), similar to early steam brewing machines.

Moka pots are widely agreed to produce inferior quality brewing to espresso machines, due to brewing at excess heat and insufficient pressure, but are considerably cheaper and more convenient than espresso machines, and the quality of brew is prized and preferred by many over unpressurized brewing.

The bottom chamber contains the water. The middle chamber is a filter-basket and sits within the bottom chamber holding the ground coffee. The top chamber, with a metal filter, screws onto the bottom chamber. When the pot is heated on a stove, the pressure from the steam in the bottom chamber forces the water through a tube into the filter-basket, through the ground coffee, the metal filter, and it then funnels into the top chamber where the coffee is then ready to serve. They are commonly found in Italy
Italy
Italy , officially the Italian Republic languages]] under the European Charter for Regional or Minority Languages. In each of these, Italy's official name is as follows:;;;;;;;;), is a unitary parliamentary republic in South-Central Europe. To the north it borders France, Switzerland, Austria and...

, Spain
Spain
Spain , officially the Kingdom of Spain languages]] under the European Charter for Regional or Minority Languages. In each of these, Spain's official name is as follows:;;;;;;), is a country and member state of the European Union located in southwestern Europe on the Iberian Peninsula...

 and Portugal
Portugal
Portugal , officially the Portuguese Republic is a country situated in southwestern Europe on the Iberian Peninsula. Portugal is the westernmost country of Europe, and is bordered by the Atlantic Ocean to the West and South and by Spain to the North and East. The Atlantic archipelagos of the...

. They are also known as a macchinetta, Italian for "little machine".

Modifications

A popular modification in home espresso machines is to retrofit
Retrofit
Retrofitting refers to the addition of new technology or features to older systems.* power plant retrofit, improving power plant efficiency / increasing output / reducing emissions...

 a PID controller
PID controller
A proportional–integral–derivative controller is a generic control loop feedback mechanism widely used in industrial control systems – a PID is the most commonly used feedback controller. A PID controller calculates an "error" value as the difference between a measured process variable and a...

, to increase temperature stability and hence extraction consistency and quality. PID controllers date from the 1950s, and have been retrofitted to espresso machines since the early 2000s, but are rarely factory-built outside of high-end machines (multi-$1,000), and hence remain (2010) a popular retrofit.

Manufacturers

Espresso machines run the gamut from entry-level to commercial and professional systems costing thousands of dollars. Popular manufactures in the home espresso machine market include: Breville
Breville
Breville is a maker of small kitchen appliances, founded in Sydney, Australia, in 1932. They created the original sandwich toaster, a small household appliance that makes toasted sandwiches. The product was a huge success upon its launch in Australia in 1974, selling 400,000 units in its first year...

, Francis Francis
FrancisFrancis
FrancisFrancis! is an espresso machine manufacturer owned by illy.Founded in 1994 by Francesco Illy, FrancisFrancis has produced espresso machines of high quality materials and design, dedicated to the home market....

, Cuisinart
Cuisinart
Cuisinart is a brand for small kitchen appliances, especially the food processor of the same name, one of the first to become popular in the United States. It was founded by Carl Sontheimer in 1971, and became a leading brand in the United States and Canada....

, De'Longhi, Saeco
Saeco
Saeco is an Italian manufacturer of espresso machines and other electrical goods, head quartered near Bologna.-History:The company was founded by Sergio Zappella and Arthur Schmed in 1981....

, Krups
Krups
Krups is a German kitchen appliance manufacturer, named after its founder Robert Krups.It is often confused with the Krupp conglomerate.The company also produces a large variety of household appliances...

 and Gaggia
Gaggia
Gaggia is an Italian company that makes coffee machines, especially espresso and cappuccino machines, in addition to small kitchen appliances...

.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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