What material is the best material to use for hand-brewed coffee filter cups? What is the difference between ceramic filter cups and resin filter cups?

As we all know, there are many different options for hand-brewed coffee filter cups. In addition to the different appearances, there are also many choices in the material of the filter cup. Filter cups of different materials will have different effects on the extraction of coffee. Recently, a friend found through online comparison that coffee brewed with ceramic filter cups will have less bitterness than that of the same filter cups of other materials. So he was very confused: "The parameters are all the same, but why does the coffee brewed with a ceramic filter cup have less bitterness? "

To know the answer to this question, we first need to understand how the material of the filter cup affects extraction! Qianjie just shared it some time ago: The main reason why filter cups of different materials produce different extraction effects is that their specific heat capacity and thermal conductivity are different!

The so-called thermal conductivity refers to the "speed" at which heat is transferred between materials. Two objects in contact with each other will eventually have the same temperature. When the thermal conductivity is higher, the faster the heat transfer rate will be; when the thermal conductivity is lower, the slower the heat transfer rate will be. The so-called specific heat capacity refers to the heat capacity per unit mass of a substance. The high and low specific heat capacity determine the speed at which the temperature of the material rises and falls. The higher the specific heat capacity, the slower the temperature of the material, because it needs to absorb relatively more heat to change the temperature, but at the same time it The heat dissipation speed will also be slower, and vice versa.

The thermal conductivity and specific heat capacity of different materials are different, and they together determine the high or low heat absorption capacity of a filter cup. Without adequate preheating, the filter cup will draw temperature from the hot water used to brew and reach the same temperature as the hot water. The higher the thermal conductivity of the filter cup, the faster it will draw temperature from hot water. The higher the specific heat capacity of the filter cup, the more temperature it will draw from hot water, and vice versa! The water temperature will directly affect the extraction efficiency during brewing. The higher the water temperature, the higher the extraction efficiency; the lower the water temperature, the lower the extraction efficiency. In other words, when the specific heat capacity and thermal conductivity of a filter cup are relatively high, without preheating, it will have a very strong heat absorption capacity and will "plunder" more temperature from the hot water."Supply" yourself!

When the water temperature drops, the extraction efficiency of hot water will decrease simultaneously, which will lead to a decrease in the total amount of dissolved coffee substances, resulting in a difference in taste. The ceramic filter cup is such a "role." If it is not preheated, it will have extremely excellent heat absorption ability, which will reduce the temperature of the hot water and the dissolved substances will be less than the next. Therefore, when the parameters and brewing methods are completely consistent, the bitterness of coffee brewed with ceramic filter cups will be less than that of filter cups made of other materials. But it's not just bitterness. In fact, all flavors have been reduced, but the bitterness is particularly obvious because it is more prominent.

Therefore, when we use ceramic filter cups, it is best to warm the cup with hot water before brewing, so as to ensure that the temperature of the hot water will not drop due to the influence of the ceramic filter cup. At the same time, the preheated ceramic filter cup will also It provides long-term insulation due to its high specific heat capacity, allowing the temperature of the liquid in the filter cup to drop more slowly. But this is precisely the most important point that needs to be paid attention to. Continuously maintaining high temperatures will relatively improve the extraction efficiency. It is best to make appropriate adjustments to the parameters based on the taste of the coffee ~

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