How are the raw coffee beans graded? What is the purpose of grading raw coffee beans?

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Coffee is like a variety of agricultural products, grading standards vary from country to country. Generally speaking, the planting height (hardness), size, defect rate and other standards vary from country to country. If it is only to be planted, it can be planted in temperate zones, but it will not be able to bear fruit if the temperature demand is not enough. Therefore, we generally say that the "coffee belt", that is, between the Tropic of Cancer and the Tropic of Cancer, is suitable for the "commercial" cultivation of coffee, and the production efficiency is of more economic value.

Coffee bean grading demonstration:

Guatemalan coffee beans

SHB: coffee beans are incomparably hard for those who grow at an altitude of 4500, 000 feet.

HB: those who grow at an altitude of 4000m / m / 4500ft are hard coffee beans.

SH: semi-hard coffee beans that grow at an altitude of 3500 Murray 4000 feet.

GW: (screened) coffee beans are taken from mountains below 2000 feet

Costa Rican coffee beans:

SHB very hard coffee beans: taken from 3900 Murray 5400 feet high mountain area.

GHB high-quality hard beans: taken from the mountain area of 3300 feet above sea level.

HB hard coffee beans: taken from a mountainous area with an elevation of 2600 Murray 3,300 feet above sea level.

LGA: Atlantic low altitude coffee beans: taken from the mountainous area of 500 Murray 2000 feet above sea level.

Grading purpose

The size of raw beans is uniform, which is beneficial to the baking operation.

Improve the value of raw beans

Graded treatment

Get raw beans

Wet treatment: grind off the endocarp

Dry treatment: grind off the shell

Remove impurities: stone, dust, endocarp or shell debris

Use the air separator to adjust the wind speed and separate foreign bodies and other impurities

Remove bad beans

Broken beans, stunted beans, insect-infested beans, diseased beans, overripe beans, unripe beans

Using air separator to separate bad beans with different specific gravity and weight (broken beans, overripe beans, unripe beans)

Using artificial vision or computer color sorting machine, there is little difference in specific gravity and weight, but there is color.

Different bad beans (insect-damaged beans, diseased beans)

Size

Sieve: a series of sieves from small to large to separate raw beans of different sizes.