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An espresso machine brews coffee by forcing pressurized water near boiling point through a "puck" of ground coffee and a filter in order to produce a thick, concentrated coffee called espresso. Multiple machine designs have been created to produce espresso. Several machines share some common elements, such as a grouphead and a portafilter. An espresso machine may also have a steam wand which is used to steam and froth liquids (such as milk) for coffee drinks such as cappuccino and caffè latte.
Espresso machines may be steam-driven, piston-driven, pump-driven, or air-pump-driven. Machines may also be manual or automatic.
The first espresso machine was created in 1822 by the Frenchman Louis Bernard Rabaut. [1] [2]
In 1855, another Frenchman, Edouard Loysel de Santais, presented a café express machine at the Exposition Universelle of Paris able to make 2,000 cups of coffee in 1 hour. [3] [4]
In 1884, Angelo Moriondo of Turin demonstrated a working example of another machine at the Turin General Exposition of 1884. [5] He was granted patent no. 33/256 dated 16 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 Angelo Moriondo, of Turin, for an invention called "New steam machinery for the economic and instantaneous confection of coffee beverage, method 'A. Moriondo', Plate CXL". Moriondo had his machine built in a very limited number, using it in a few establishments he owned, such as the American Bar in the former Galleria Nazionale on Via Roma in Turin, [6] demolished in the 1930s.
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 19 December 1901. It was titled "Innovations in the machinery to prepare and immediately serve coffee beverage" (Patent No. 153/94, 61707, granted on 5 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.
In 1933 Hungarian-Italian Francesco Illy invented the first automatic coffee machine that substituted pressurized water for steam. The Illetta became the predecessor of today's espresso machine.
Numerous 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 cup or shot glass, to maintain a higher temperature of the espresso.
The piston-driven, or lever-driven, machine was developed in Italy in 1945 by Achille Gaggia, founder of espresso machine manufacturer Gaggia. The design generically uses a lever, pumped by the operator, to pressurize hot water and send it through the coffee grounds. The act of producing a shot of espresso is colloquially termed pulling a shot, because these lever-driven espresso machines required pulling a long handle to produce a shot. [7] Lever-driven espresso machines are sometimes called manual espresso machines because of this.
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; 116 to 145 psi).
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. [8] This design is still used today in lower-cost consumer machines, as it does not need to contain moving parts. Also, steam-driven machines do not produce as high a pressure for extraction compared with pump-driven. This results in the crema, a hallmark of an espresso, being of lower quality.
A refinement of the piston machine is the pump-driven machine, which was introduced in the Faema 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. Espresso machines are made to accept water directly from a cold water line supply, common in commercial installations, or from a separate tank that must be filled with water by hand. The latter is more common with lower-volume commercial installations and domestic espresso machines. Due to the required high pumping pressure and precision flow control needed, the particular type of electric pumps typically used are known as solenoid-piston pumps. These pumps are classified as a positive displacement type (general category) of pump.
Four variants exist in home machines, depending on how brew water and steam are boiled; in discussion these are generally known by acronyms.
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, N2 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. Handpresso Wild, invented by Nielsen Innovation SARL, a French innovation house, was introduced in 2007.
A grouphead (or group head) is the receiver for the removable portafilter (or group handle). A typical consumer espresso machine normally has only one grouphead, while popular professional machines, such as those used at commercial coffee shops, can contain anywhere from one to seven. During the process of extracting a shot of espresso, hot water is forced through the grouphead under pressure. The grouphead contains many holes (the shower) that attempt to distribute the pressurised water evenly over the surface of the grinds in the portafilter basket and thereby achieve an even cross sectional flow. [10]
A portafilter (or group handle) attaches to the grouphead of semi-automatic and piston-driven espresso machines, and carries a tamped puck of coffee grounds within its basket. It is usually made of brass for better heat retention, and is attached by a plastic or wooden handle. The portafilter forms a seal with the espresso machine's gasket, and directs high-pressure hot water through the coffee puck. After-market retailers also sell bottomless portafilters that minimize the espresso's contact with any metal. A bottomless portafilter is one tool baristas use to analyze the quality of the coffee grind and the evenness of the extraction and allows for a visual check of "channeling" or the condition in which water is able to pierce a hole in the espresso puck during the brew process leading to poor extraction. Often, baristas use knockboxes to store their spent espresso grounds after they have pulled a shot.
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 machines are automatic. [11] Manual machines are more popular in Europe, where it is more common to drink straight espresso.
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 (21 psi) rather than 9 bars (130 psi) – and use hotter water – a mix of boiling water and steam at above 100 °C (212 °F), rather than 92–96 °C (198–205 °F) of espresso machines, similar to early steam brewing machines.
The bottom chamber contains the water. The middle chamber is a filter-basket holding the ground coffee and sits within the bottom chamber. 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, Spain, and Portugal. They are also known as a macchinetta (Italian for little machine) or caffettiera (Italian for coffee maker).
Cappuccino is an espresso-based coffee drink that is traditionally prepared with steamed milk including a layer of milk foam.
Espresso is a concentrated form of coffee produced by forcing hot water under high pressure through finely ground coffee beans. Originating in Italy, espresso has become one of the most popular coffee-brewing methods worldwide. It is characterized by its small serving size, typically 25–30 ml, and its distinctive layers: a dark body topped with a lighter-colored foam called crema.
Italians are well known for their special attention to the preparation, the selection of the blends, and the use of accessories when creating many types of coffees. Many of the types of coffee preparation known today also have their roots here. The main coffee port in Italy is Trieste where there is also a lot of coffee processing industry. Italian coffee consumption, often espresso, is highest in the city of Trieste, with an average of 1500 cups of coffee per person per year. That is about twice as much as is usually drunk in Italy.
A coffee percolator is a type of pot used for the brewing of coffee by continually cycling the boiling or nearly boiling brew through the grounds using gravity until the required strength is reached. The grounds are held in a perforated metal filter basket.
Ristretto, known in full in Italian as caffè ristretto, is a "short shot" of a highly concentrated espresso coffee. It is made with the same amount of ground coffee, but extracted using half as much water. A normal short shot might look like a ristretto, but in reality, would only be a weaker, more diluted, shot. The opposite of a ristretto is a lungo ('long'), which has double the amount of water. The French call a ristretto café serré.
Philips Saeco S.p.A., or short Saeco, is an Italian manufacturer of manual, super-automatic and capsule espresso machines and other electrical goods with headquarters and factories in Gaggio Montano near Bologna.
Gaggia is an Italian manufacturer of coffee machines, especially espresso machines, in addition to small kitchen appliances. The company is owned by the Evoca Group.
Café Cubano is a type of espresso that originated in Cuba. Specifically, it refers to an espresso shot which is sweetened. However, the name can refer to coffee based drinks that include Cuban espresso as the main ingredient, such as café con leche.
Microfoam is finely textured milk used for making espresso-based coffee drinks, particularly those with latte art. It is typically made with the steam wand of an espresso machine, which pumps steam into a pitcher of milk.
La Marzocco, founded in 1927, Florence, by Giuseppe and Bruno Bambi, is an Italian company specializing in high-end espresso coffee machines. It is based in Scarperia, with branch offices worldwide.
Rancilio is an espresso machine manufacturer, founded in 1927 by Roberto Rancilio in Parabiago, Italy.
FAEMA primarily engaged in the production of espresso machines, was founded in 1945 by Carlo Ernesto Valente, in Milan, Italy. Faema was to become synonymous with the post-war production boom in Italy, by actively pursuing technological innovation as the company's driving force.
Coffee preparation is the process of turning coffee beans into liquid coffee. While the particular steps vary with the type of coffee and with the raw materials, the process includes four basic steps: raw coffee beans must be roasted, the roasted coffee beans must then be ground, and the ground coffee must then be mixed with hot or cold water for a specific time (brewed), the liquid coffee extraction must be separated from the used grounds, and finally, if desired, the extracted coffee is combined with other elements of the desired beverage, such as sweeteners, dairy products, dairy alternatives, or toppings.
The moka pot is a stove-top or electric coffee maker that brews coffee by passing hot water driven by vapor pressure and heat-driven gas expansion through ground coffee. Named after the Yemeni city of Mocha, it was invented by Italian engineer Luigi Di Ponti in 1933 who sold the patent to Alfonso Bialetti, an aluminum vendor. It quickly became one of the staples of Italian culture. Bialetti Industries continues to produce the original model under the trade name "Moka Express".
Caffè crema refers to two different coffee drinks:
A coffeemaker, coffee maker or coffee machine is a cooking appliance used to brew coffee. While there are many different types of coffeemakers, the two most common brewing principles use gravity or pressure to move hot water through coffee grounds. In the most common devices, coffee grounds are placed into a paper or metal filter inside a funnel, which is set over a glass or ceramic coffee pot, a cooking pot in the kettle family. Cold water is poured into a separate chamber, which is then boiled and directed into the funnel and allowed to drip through the grounds under gravity. This is also called automatic drip-brew. Coffee makers that use pressure to force water through the coffee grounds are called espresso makers, and they produce espresso coffee.
Angelo Moriondo was an Italian inventor, who is usually credited with patenting the earliest known espresso machine, in 1884. His machine used a combination of steam and boiling water to efficiently brew coffee.
A milk frother is a utensil for making milk froth, typically to be added to coffee. It aerates the milk, creating a thick but light foam. Milk frothers were introduced through the use of espresso machines that contained steamed wands that would froth steamed milk. Although created in Italy, the espresso machine and steam wands were exported internationally to other countries, and frothed milk was introduced around the world.
Luigi Bezzera was an Italian mechanic and innovator. He is the inventor of the first removable portafilter espresso machine, while Angelo Moriondo holds the first recorded patent for the espresso machine, he hired a mechanic in Milan to build it. Some believe that mechanic to be Luigi Bezzera.
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