Coffee Filter Paper-How to Use Coffee Filter Paper

Hand-made coffee filter paper origami-usage of coffee filter paper

1. The phenomenon of steaming: expanding into hills

When hot water is poured in, the gas in the coffee powder expands when heated (when the coffee powder is enlarged, it will look like a honeycomb, with many gaps). After the gas expansion, it will begin to discharge the excess gas, which will cause the coffee powder and hot water to form an expanding hill on the outside.

At the same time, in addition to the discharge of gas from the inside of the coffee powder, hot water also slowly seeps into the inside of the coffee powder so that some soluble substances in the coffee powder begin to dissolve and form a high concentration of coffee liquid.

In the final stage of steaming, because the gas is almost discharged, the whole temperature decreases, and some undischarged air begins to shrink slightly, so from the outside, the hill will gradually dry or slightly crack and collapse, which also means that the steaming is complete and the second water injection can be started.

The factors affecting steaming include the level of water temperature, the amount of water, the length of steaming time and the storage time of coffee beans.

Note 1: in two cases, the expansion rate is not obvious or the powder does not react when steaming, which are freshness and baking degree respectively. First of all, there is a certain amount of gas in the fresh coffee powder, the gas in the coffee powder will be discharged slowly over time, and the coffee powder absorbs some moisture in the air, resulting in less gas, so stale ripe beans do not expand or do not react. Second, shallow roasted beans will not expand too violently, because the quality of light roasted coffee beans is denser, so the overall gap is not as much as medium or deep roasting, so it contains less gas.