What are the unripe beans in the defective coffee beans? Why unripe beans are formed?

Professional coffee knowledge exchange more information about coffee beans please follow the coffee workshop (Wechat official account cafe_style)

Physical features:

The appearance of raw beans shows mechanical damage wounds such as rupture and fragmentation, and sometimes the edges are black.

Classification and defect score

Five broken beans are counted as an II defect.

Influence in the cup:

If there is mildew, there are obvious soil mildew, dirty, sour and fermented taste.

Causes:

During the treatment, the peeling machine or sheller was improperly trained to cause the bean to be squeezed or cut.

When washing, the crushed mouth injured in the peel removal process is more likely to be infected with mold and oxidation, generally turning dark reddish brown or black.

Sun treatment of the broken mouth is generally caused by the shelling of dried fruit, generally relatively clean without signs of oxidation.

Avoid and improve:

Planting: avoid picking unripe coffee fruits.

Treatment: carefully train the peeling machine and sheller; small broken beans can be removed by weight machine and screen, while large broken beans can be removed by color selection and hand selection.