Every day at 3:00 PM, it’s time for me to have a cup of coffee.
I don’t know when coffee became our daily beverage.
At first, we may be curious about the flavor of this mainstream beverage that is popular in the West. hmmm…… bitter but fragrant can be the reason why we like it? I’m afraid it’s hard.
In the tired and sleepy working hours, a cup of coffee is a good choice for office workers – not only refreshing and de-stressing. This comes from the fact that coffee contains caffeine (a xanthine alkaloid compound, also found in tea), a central nervous system stimulant that temporarily wards off drowsiness and restores energy. When people are engaged in thinking, reading, meetings and other mental labor, most likely will choose to take caffeine to refresh. This is one of the major reasons why coffee is so popular around the world.
In addition, coffee has a certain degree of addiction, it is a widely consumed stimulant. In North America, 90% of adults consume caffeine on a daily basis.
Later, many people took to making their own coffee in order to be able to drink their favorite type of coffee whenever they wanted. The easy part is to use “Éclat” and cold brew, and master the amount of coffee powder and water to make a delicious cup of coffee; the difficult part is to hand-brew, which is more demanding in terms of technique and time; in addition, the coffee made from light-roasted coffee beans using the iced brewing method is very good, with a lot of special flavors that can be extracted and lower acidity and bitterness, even though it requires hours or even a whole night of production time. It takes hours, if not all night, to make the coffee.
Making coffee by hand is great, but only for the individual. In the commercial market, manual production is too slow to meet the efficient demands of mass production.
As a result, the standardized form of the automated coffee machine, driven by the consumer market, has taken the stage for global popularity.
Let’s find out！
Table of Contents
History of Coffee Machines in the World
A coffee maker is a cooking appliance used to brew coffee.
For centuries, making a cup of coffee has been a simple process. Roasted and ground coffee beans were placed in a pot or pan, hot water was added, and a lid was put on to start the brewing process.
But with the advancement of technology and people’s research on coffee, making coffee has become a lot more involved, and coffee makers have evolved with the times.
Throughout history, the development of coffee makers has been divided into three stages:
1.The French conceived the coffee machine and invented and perfected the “Steam Coffee Machine”.
In 1818, the French invented the coffee extractor and the first coffee machine in history.
In 1822, the French improved the design of the coffee machine to obtain a cleaner coffee extract. Two years later, the French improved the machine again, but failed. In 1822, the French invented the perfect “Steam Coffee Machine”.
In 1827, the French proposed that coffee powder should be moistened with steam before extraction.
In 1833, the British invented the first pressurized coffee machine in history. They also put forward the theory that the best taste of coffee is when the bitter flavor appears at the earliest stage and is extracted at the later stage.
In 1840, the French improved the pressurized coffee machine and designed the “vacuum pump” to pull the hot water downward, passing the coffee grounds with extra force.
In 1844, the French devised a number of “theoretical designs for extractors” that would define the product prototypes of many of the world’s future coffee machine manufacturers.
In 1847, the French invented the world’s first “steam pressure coffee boiler”.
In 1855, the French improved the steam pressure coffee boiler, and the number of cups produced by one coffee machine reached 10,000.
In 1885, the Italian signed the coffee patent, the right to improve coffee was transferred from the French to the Italians, and the number of cups dispensed by a coffee machine reached 50 cups.
2. Italian Leapfrog Improvement
In 1902, Italy commercialized the coffee machine by adding a pressure-removing piston to the coffee.
In 1903, Bezzern sold the patent to Pavoni (the originator of “La Pavoni” coffee) due to financial difficulties.
In 1905, the La Pavoni company was announced.
In 1906, the Italians installed a heat exchanger inside the coffee machine to heat the water quickly.
In 1909, the Italians added a pump to the coffee machine to solve the problem of insufficient pressure during extraction.
In 1910, an Italian invented the “helical downward piston” and used it in coffee machines, and the original piston type lever spring coffee machine appeared.
In 1935, Dr. Illy (founder of the Illy brand) invented a machine that compresses air to push water through coffee grounds.
In 1938, the boiler’s position was successfully modified from vertical to horizontal.
In 1948, the Italian introduced the piston lever spring coffee machine to the market.
In 1956, the Italians improved the coffee machine by utilizing the hydraulic system, which reduces the pressure under the lever.
3.Electronic Technology Introduced to the Coffee Machine Manufacturing Sector
In 1955, Giampietro Saccani took the important step of stabilizing the temperature of the brewing head.
In 1961, Italy and Spain collaborated to produce the E61 model. In the past, hot water was pressurized, but now it was pressurized and then heated, a perfect revolution compared to the past.
In 1962, the popularization of electronic components, “heat exchange, heat circulation” was applied to coffee machines.
Looking at the three historical stages of coffee machine development, it is not difficult to realize that coffee machines have been changing around the two themes of “pressure” and “temperature”. Especially pressure – the most important factor in coffee extraction.
Stress is a wonderful factor that can also have a rather complex effect on espresso.
Pressure sensors are the basic equipment for making good coffee
There are many different types of coffee makers, including vacuum coffee makers, coffee percolators, moka pots, electric drip coffee makers, coffee pots, single-cup coffee makers and fully automatic espresso coffee makers, dll., and their brewing principles are not quite the same. Generally speaking, all major coffee shops use fully automatic coffee makers. Fully automatic coffee makers produce thick coffee by carefully measuring the force of the pressurized water, which is suitable for large-scale and rapid coffee production in stores.
Fully automatic coffee machines are devices that can produce various types of coffee completely automatically and basically consist of a grinder, instant water heater, pump and brewing unit. In addition to making coffee, some fully automatic coffee makers are equipped with additional modules that use steam to heat the milk and make it frothy.
To produce coffee, it is first ground in a grinder, then moistened with a small amount of water at low pressure in a carafe and dissolved to release the flavor. Then, a selected amount of hot water is passed through the layer of dissolved coffee grounds at high pressure to produce a highly concentrated coffee.
Pressure is an even more important factor in the brewing process, as it needs to penetrate the cell walls of the coffee, and is therefore essential for the extraction of the coffee’s flavors, including acidity, bitterness, volatile aromatic molecules, oils, salts, and nitrogen-based substances. Too much pressure will over-extract the coffee, resulting in a very acidic and bitter espresso, while too little pressure will result in insufficient extraction, resulting in a light and acidic cup of coffee. Only with proper pressure can a cup of good quality coffee be extracted.
Fully automatic espresso machines, for example, often rely on the exact pressure (and the right temperature) to produce the perfect espresso. For example, espresso is brewed by passing water under high pressure through the coffee. According to the Istituto Nazionale espresso guidelines, the inlet pressure is 9±1 bar (130.5±14.5 psi), the inlet temperature is 88±2°C, and the brewing time is 25±2.5 s. The Istituto Nazionale espresso machine is a perfect example of a fully automatic espresso machine.
Here, it is important to make a point – 9 bar is the most commonly recommended pressure setting for brewing coffee, which is equivalent to 4 times the normal tire pressure of a car, and most cars have tires that need to be inflated up to 32 PSI (tentang 2.2 bar).
Because of these specific standards, coffee makers are manufactured with pressure sensors to ensure that the exact pressure is always followed.
A pressure sensor is an electronic device that detects, regulates or monitors pressure and converts the sensed physical data into an electronic signal. There are three main types of pressure sensors, each measuring a different type of pressure. The first is the gauge pressure sensor, which measures pressure relative to the pressure of the surrounding atmosphere; the second is the absolute pressure sensor, which measures pressure with reference to absolute zero pressure (or vacuum) and is generally used for precision pressure measurement. The third type is the differential pressure sensor, which is used in coffee machines. It uses two different pressure ports, referenced to each other, to measure the pressure difference. It is mainly used to detect pressure differences in pipes and to monitor the filter system.
In an automatic coffee maker, in order to generate sufficient pressure, the built-in pump that delivers the hot water to the brewing chamber generates high pressure itself.
At the same time, the brew pressure (pump outlet pressure) must be stabilized in order to ensure constant espresso quality. This is achieved by means of pressure sensors that allow precise control of the pressure.
Pressure sensors not only measure steam pressure to prevent overpressure, but also regulate water temperature.
In the past, if an overpressure occurred, a valve would be switched to allow the steam to escape – an overpressure valve (OPV) installed by the espresso machine manufacturer on the outlet side of the pump, which could be adjusted with a screwdriver and could not always be operated without disassembling the machine.
But now, as manufacturers continue to improve their technology and take into account consumer demands for ease of use, modern coffee makers are able to adjust brewing pressure at the push of a button, which can be conveniently operated from the outside of the coffee maker. In this case, the OPV is replaced by a proportional valve and a pressure sensor mounted behind the valve.
In fact, pressure sensors are not the only thing used in fully automatic coffee machines. Many people use a variety of manual coffee makers combined with an additional purchased pressure gauge to check the pressure of the machine at the head of the coffee maker to get a satisfactory extraction pressure.
Although 9Bar is the recommended extraction pressure, there is no absolute standard for coffee lovers.
In fact, coffee beans are roasted to different degrees, to a large extent, there are deep, medium and light, to a small extent, even if the degree of roasting is the same, but each batch is slightly different. And everyone wants different flavors, which leads to inconsistencies in coffee extraction pressure.For example, some people think that espresso tastes better when extracted at 8.5 Bar, but it is easy to over-extract when the pressure is increased, while others think that 11 Bar is the best.
Sudah tentu, there are many other key factors in making a good cup of coffee: the amount of ground coffee, the density of the beans, the quality of the equipment, the size of the brewing handle, the softness or hardness of the water, the current room temperature, the extraction time and so on.
Pressure and Extraction Time Control in Coffee Brewing Process
In any case, pressure sensors are very important devices for coffee makers and coffee lovers. The pressure sensor is an essential part of the automatic coffee machine that is rapidly spreading the popularity of coffee all over the world.
Coffee Market Explodes, Pressure Sensors and Other Upstream Markets See Opportunities
With the growing trend of consumer upgrading in recent years, coupled with changes in lifestyle concepts and the popularization of coffee culture, the global coffee market has been on an ever-expanding trend. China has become one of the most promising coffee consuming countries in the world. Currently, coffee consumption in China has grown by as much as 15%, and in 2017 alone, the market size of coffee consumption in China exceeded RMB 100 billion. Some organizations predict that under this development trend, the compound annual growth rate (CAGR) from 2024 to 2030 is expected to reach 4.7%. Increasing coffee consumption in Asian countries is one of the key factors driving growth. Additionally, new product launches such as green coffee and organic coffee are expected to drive the market growth by generating significant consumption. Growing consumer awareness about the health benefits of coffee is likely to lead to increased consumption, which in turn will boost the demand for coffee machines.
The rapid growth in global coffee consumption has created new business opportunities for coffee machine companies.
With the rise of new retail coffee shops, the coffee culture has been transformed into a diverse, multi-consumption scene. Coffee machines have gradually become a necessity for many families, as well as offices, hotels, restaurants and other places. Against this backdrop, the market demand for coffee machines for coffee shops will continue to grow in the future, which will in turn drive the rapid growth of the commercial coffee machine market.
Source: www.grandviewresearch.com Data Center
The upstream of coffee machines is the coffee machine parts industry, such as the electronics industry that provides pressure sensors, heating elements, control panels, dll., as well as steam valves, filters, glass pots, and coffee machine housings. In the future, as the coffee culture continues to warm up and the popularity of coffee machine products continues to increase, the application of coffee machines in commercial settings will be further expanded, including clothing stores, snack bars, breakfast stores and even on the high-speed rail are likely to see the figure of fully automatic coffee machines. The upstream market, which provides the basic materials for coffee machines, is also expected to enjoy significant benefits.
Conclusion:
In addition to coffee makers, pressure sensors are widely used in many automotive, medical, industrial, consumer, and construction equipment, which rely on accurate and stable pressure measurements for reliable operation. With more and more industries relying on pressure sensors to monitor and control their applications, the demand for pressure sensors in the market has increased considerably and the global pressure sensors market is expected to reach USD 11.4 billion by 2030.
