The coffee bean sealed can is leaking oil, do you know the reason?

The oil in the coffee bean sealed can is due to the gradual release of oil in the coffee beans during long-term storage. This phenomenon is mainly caused by the following reasons.

First of all, coffee beans themselves are rich in oil. The oil in coffee beans mainly comes from the internal endosperm and the external peel. These oils will be activated during the roasting process, giving it a rich aroma and taste. However, after roasting, some of the oil that has not completely evaporated still exists inside the coffee beans.

Secondly, the sealed can can effectively protect the coffee beans from the influence of external factors such as air, humidity and light. However, when stored in a sealed can for a long time, due to temperature changes or other reasons that cause pressure changes, tiny cracks or pores may appear inside the container. These tiny cracks or pores can allow some oils that have not completely evaporated to escape and be carried away by air flow.

In addition, during long-term storage in sealed cans, coffee beans may undergo minor physical changes, including slight fluctuations in moisture content, changes in temperature and humidity, etc. These minor changes can cause the oil inside the coffee beans to release.

In summary, the oil release from the sealed coffee bean can is due to the fact that the coffee beans themselves contain a lot of oil, which is not completely volatilized during the roasting process and escapes through tiny cracks or pores during long-term storage. In addition, factors such as temperature, humidity and pressure inside the container will also affect the release of oil inside the coffee beans.