Explanation of espresso principle basic operation of espresso machine coffee bean grinding of espresso machine

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The production and principle of Espresso espresso:

Italian coffee maker

It is usually equipped with a boiler to produce hot water, which is pressurized to about 9 atmospheric pressure and then flows through the powdered coffee beans in a metal filter to brew coffee. The coffee brewed by this pressurized hot water is thicker than usual and has emulsified fat. It is often called espresso or espresso. There are many kinds of Italian coffee machine. For general commercial use, the most common one is single boiler, and then there are double boilers and multiple boilers. Of course, the price also becomes more expensive, in addition to the general electronic control switch, there is also a pull-out Italian coffee machine, each has its own advantages. Commercial ones range from 40, 50, 000 to 40, 500000, and there are numerous types.

Principle of espresso: high pressure extraction

The espresso machine uses high-pressure hot water to extract coffee through the coffee powder trough. Because today's Italian coffee machines use air pumps to increase the pressure in the boiler to achieve the pressure needed to extract cream, it is also called pump coffee machine. In the past, the older Italian coffee machine needed to manually push the pressure bar to boost the boiler, also known as Laha coffee machine, now the value of Laha coffee machine is mainly reflected in its viewing, the convenience of use and the taste of coffee are not as good as pump coffee machine.

1. Steam knob 2, boiler water level window 3, steam outlet

4. Operation control panel 5, warm cup plate 6, hot water knob 7, pressure gauge

8. Coffee cooking outlet 9, filter handle 10, hot water outlet 11, water tray 12, manual water replenishment 13, power switch

Basic Operation of Italian Coffee Machine

1. The supply of hot water

The machine has the function of supplying hot water, and hot water will flow out by rotating the hot water knob. Can make tea, hot water or other hot drinks and so on.

The flow rate of the hot water outlet is proportional to turning the hot water knob.

Warning: when using hot water, please be careful that direct contact with boiling water may cause permanent damage to people and objects.

two。 The supply of steam

Turn the steam knob to heat drinks with steam, such as milk, hot chocolate, etc.

The amount of steam at the steam outlet is proportional to the rotation of the steam knob.

Warning: when using steam, please be careful that direct contact with steam may cause permanent damage to people and objects.

(1) parts cleaning

In order to achieve complete cleanliness and maximum efficiency. In the functional parts and accessories and appearance, we must do some simple cleaning work.

1. Cleaning of filter and filter handle

Filters and filter handles and related parts must be washed with water after each use, ideally soaking them in hot water all night, so that the greasy coffee grease will dissolve.

Filters and filter handles should be washed with hot water every day, and it is best to soak them in hot water all night to dissolve the coffee grease left on the filter. It is recommended that you add appropriate cleaning powder to the water. Then wash it again with lemon juice. In this way, the residue of the detergent can be removed, otherwise the brewed coffee will have the taste of drug residue.

Note: please clean with a clean and sanitary cloth.

Photo source: Brest Coffee training School

two。 Cleaning of steam foaming tube

Every time you heat milk or chocolate, you must clean the steam vent with a special cloth, and check the small hole in the steam vent every month, clean it and remove the dirt from the hole with a needle.

3. Cleaning of Cooking head Assembly

(1) replace the perforated filter with a non-porous filter into the support.

(2) put 5 grams of cleaning powder into the porous filter and lock the filter handle to the cooking head.

(3) press the cooking key and let the cooking head operate until it stops by itself (11 seconds)

(4) remove the filter handle and pour out the dirty water.

(5) repeat steps (3) and (4)

(6) pour out the dirty water and clean the support, and then clean the cooking head with a clean support to remove some of the cleaning powder left on the cooking head.

(2) cleaning of the body

Scrub the outer shell of the body with a piece of cloth soaked in warm water. Do not use cleaners that contain corrosives and friction, otherwise the shell of the body may be damaged and washed in hot water with a clean, slightly wet cloth, otherwise it will scrape and damage the shell of the body.

(3) cleaning of grinders

The dispenser of the coffee grinder must be cleaned before leaving work every day.

Inspection and maintenance

As mentioned earlier, regular inspection and maintenance is carried out to ensure the safety and durability of the machine, and to give full play to its use efficiency.

1. Machine

Please check the following points periodically:

(1) Water pressure: check the pressure value on the pressure gauge at any time, which must be at 3-9bar.

(2) Boiler pressure: always check the pressure value on the pressure gauge, which shall be 1-1.2bar.

(3) filter: check the coffee oil left in the filter at any time.

2. Italian grinder

Please check the following points periodically:

(1) check the output of powder: between 7-8g each time, check the thickness of grinding and the sharpness of grinder blade.

(2) Blade wear: remember, a flat blade can grind nearly 600lbs of coffee beans, while a tapered one can grind nearly 4000 pounds of coffee beans. If the quantity exceeds, it may no longer be used (please check monthly)

The semi-automatic machine is equipped with a "dose-grinder", which plays a very important role in grinding coffee every day. However, this "dose-grinder" must be operated in accordance with professional instructions.

Please note the following points:

1. Good ESPRESSO coffee, it is recommended that you do not have too much Italian coffee beans in stock, and pay attention to the expiration date indicated by the manufacturer.

two。 Never grind a lot at one time, it is best to grind a certain amount in the bean grinder, and then use it up on the same day.

3. It is best not to buy coffee powder that has been ground, so that the coffee can easily go bad.

4. Put 8 grams of ground coffee powder in the filter of the support, flatten it with a special press, and then use a small brush to sweep away the coffee powder remaining on the edge of the support. Then put the support into the cooking head, but do not button too tight to prevent excessive wear and tear of the pad.

5. The amount of coffee each time is adjusted by special screws that can be adjusted in the grinder.

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