How finely ground the coffee beans are

introduction

Hand-brewed coffee is a delicate cooking process, one of the most important steps of which is grinding beans. The size of the beans directly affects the taste and mouthfeel of the coffee. This article will focus on exploring the optimal grinding size and introduce the impact of the grinding degree of hand-brewed coffee beans on the quality of coffee.

1. Research background of unmanned coffee machine

Grinding beans is a crucial step in the process of making hand-brewed coffee. Different grinding sizes will release different amounts and types of dissolved substances, thus affecting the aroma, taste and flavor of coffee.

2. Effect of coarseness on extraction time and water flow rate

Coarser particles can extend the extraction time and allow for faster water flow. This allows the water to come into contact with the particles more fully and extract more dissolved substances. However, if the particles are too large, it may cause the water to pass through too quickly and not be able to fully extract.

3. Maintaining balance: crushing size selection

In hand-poured coffee, the choice of grind size needs to maintain a balance. If the particles are too fine, the water flow rate will be slow, which may lead to over-extraction and bitter taste. On the other hand, if the particles are too large, the flavor of the coffee cannot be fully extracted.

4. Tips for adjusting the grinder

In order to achieve the best grinding effect, we can control the crushing size by adjusting the grinder. Generally speaking, turning left will make the particles finer, while turning right will make them coarser.

5. Grinding requirements for different brewing methods

Different hand-pour equipment and brewing methods require different grind sizes. For example, a French press usually requires more uniform and slightly fine particles, while a condenser requires relatively large and uniform particles.

6. Quality Assessment and Experimental Design

To evaluate the effect of different grind sizes on coffee quality, we can conduct a series of experiments. In each experiment, we keep all other conditions constant and only adjust the grind size, and compare the differences between different samples by tasting, smelling and evaluating the mouthfeel.

7. Results and Discussion

Based on the experimental results, we can conclude that for hand-brewed coffee, the optimal grinding size should be between medium-fine and medium-coarse. This can fully extract the coffee flavor substances while avoiding over-extraction and causing bitter taste.

8. Conclusion

The grinding degree of hand-brewed coffee beans has an important impact on the quality of coffee. Choosing the appropriate grinding size can balance the water flow rate and extraction time, and fully extract the aroma, flavor and taste of the coffee.

References

[1] Coffee Research Institute. (2019). The Impact of Grind Size on Brewing Methods [Online]. Available: https://www.coffeeinstitute.org/blog/2019/6/26/the-impact-of-grind-size-on-brewing-methods.

[2] Rao, S. (2018). The Coffee Roaster's Companion [Kindle Edition]. Scott Rao.