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Grading of raw coffee beans there are two ways to grade raw coffee beans.

Published: 2024-06-03 Author: World Gafei

Last Updated: 2024/06/03, There are two ways to classify raw coffee beans, one is the filter number, and the other is the elevation. It is divided by the filter number, and the size is size in terms of the screen size. Round beans are generally smaller than flat beans, between 8-13 and 12-29. 8, 9, 10. 12, 13. 18. 29 = small, medium, ordinary. Quasi-big. Big, extra large. The bigger the size, the bigger the beans. Like SC-.

There are two ways to grade coffee beans, one is to filter the number of points, one is to elevation points.

Filter number to divide, size to screen mesh as the unit size.

Round beans are generally smaller than flat beans, round beans between 8-13, flat beans between 12-29.

8,9,10... 12,13... 18... 29 => Small, Medium, Normal... It's a big... big, extra big.

The bigger the number, the bigger the bean. SC-19, for example, is bean number 19.

Below is a description of the elevation of the sub-law, elevation is the sea splash. It is generally divided into abbreviations:

H.B. is a good coffee bean.

G.W is a premium washed coffee bean.

P.W. is the finest washed coffee bean.

H.B. Altitude 4000-4500 inches

Grading purpose: to make the size of raw beans uniform, conducive to baking operation; improve the value of raw beans.

hierarchical processing method

Get green beans

Wet treatment: crushing the endocarp

Dry treatment: crushing the shell

Removal of impurities: stones, dust, endocarp or shell debris

Use the winnowing machine to adjust the wind speed and separate impurities such as foreign matter.

Remove bad beans

Broken beans, stunted beans, pest beans, diseased beans, overripe beans, immature beans

Use winnowing machine to separate bad beans (broken beans, overripe beans, immature beans) with different specific gravity and weight

Use artificial vision or computer color sorting machine to separate bad beans (pest beans, diseased beans) with little difference in specific gravity and weight but color difference.

A series of screens of varying mesh sizes for separating beans of varying sizes.

mesh diameter

International custom sizes are 9~22, the number used represents the mesh diameter of the number as the numerator, 64 as the denominator fraction, the unit is inches. For example: 14 refers to green coffee beans that can pass through a 14/64 inch mesh screen, and: 19+ refers to green coffee beans that can pass through a 19/64 inch mesh screen.

Classification standards and codes

The government of each coffee-exporting country sets its own classification standards and grade codes

Common classification criteria

block trading

Percentage of bad beans

pea-sized

Bean hardness

specialty coffee

Name of farm where production takes place

organic culture (organic)

fair trade

African countries-Kenya kenya