The effect of single-end and double-head handles of Italian coffee machine on extraction concentration, which is more stable?

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Basic parameters of Espresso

As with any coffee, you need to know the amount of coffee powder (and the thickness of the powder), the amount of water, the extraction time and the final amount of coffee extracted. All of these factors are closely related to making coffee, but for Espresso, you can ignore the water factor at the moment.

Let's break it down:

The extraction time is 25 seconds, try to follow this time, unless you plan to take some different tests.

The amount of coffee powder will depend on the size of your powder bowl (single and double), requiring 8-10 grams of coffee powder for each serving of Espresso extracted.

A serving of Espresso is usually 25-35 milliliters, which can be easily adjusted by other parameters.

The difference between single-headed handle and double-headed handle

The powder bowl is essentially a kind of filter medium, and one of the extraction elements is the filter medium. If the specification of the filter media itself is different, the effect is naturally different. The double part can hold more powder, and the content of concentrated substance extracted under the same condition is more. 2. The extraction effect of 7g powder and 14g powder is not only double. Suppose 7 g powder * 25 seconds to get a cup of 30ml, after increasing the amount of powder to 14 g, the structure of pressed powder thickens, the difficulty of water penetration increases, the extraction time to reach two cups of 30ml liquid will increase, and the longer contact time between powder and water, the more soluble matter will be increased. Suppose the time is increased by 10 seconds, which is 7 g / kg 2 * (25 / 10) seconds, which is equivalent to two single powder bowls each with more than # extraction for 10 seconds. I will only give a rough example to illustrate the principle. Strictly speaking, the main differences between a single bowl and a double bowl will be different in terms of capacity, shape, number of mesh, and so on. The subject will try to think about this for himself. 3. Double powder bowls have competition standards. Please refer to the rules of the WBC barista contest.

The focus of the double-headed coffee handle on the cloth is to flatten the powder cloth evenly, because the powder bowl with a single handle is different from the double head, and a small groove is needed in the middle of the single-end arm in addition to evenness. In order to avoid excessive but insufficient powder extraction on the thin edge of the single-head coffee handle.

The double handle will be more stable, but the disadvantage is that when there are no two cups of coffee to make, the coffee on the other side is either drunk by the barista or not. Another way is to increase the size of the cup.

The single head stability is not high because each barista has different habits of cloth powder, which will affect the stability of store coffee products to a certain extent. It is even more difficult for beginners in coffee.

END

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