1. Parchment Remover Parchment is first screened of foreign material, before passing over a rotating metal disk, which uses friction to separate the parchment from the green coffee. Parchment is then pulled out of the machine by a vacuum, while the green coffee is channeled out of the machine.   

Parchment Remover

Parchment is first screened of foreign material, before passing over a rotating metal disk, which uses friction to separate the parchment from the green coffee. Parchment is then pulled out of the machine by a vacuum, while the green coffee is channeled out of the machine. 
 

2. Size Grader To be graded for size, green coffee passes over a series of layered screens, each containing different sized perforations, the largest on top, which allow beans to fall through as they vibrated forward. The largest beans remain on the top screen, while the smaller pass onto their respective size screens. Each size bean is channeled into separate chutes, where each will continue processing for density and color. 

Size Grader 

To be graded for size, green coffee passes over a series of layered screens, each containing different sized perforations. The largest screen is positioned on top, and allows beans to fall through as they vibrate forward, while the smaller beans pass onto their respective size screens. Each size bean is channeled into separate chutes, where each will continue processing for density and color. 


3. Density Grader Green coffee is graded for density to determine the integrity of the bean. It is loaded onto a long metal surface, positioned at a five to ten degree slope, and fixed with small grooves that allow air to pass through. As coffee is vibrated forward, less dense beans gravitate down the slope, while the densest beans gravitate up the slope. 

Density Grader 

Green coffee is graded for density to determine the integrity of the bean. It is loaded into a long metal surface, positioned at a five to ten degree slope, and fixed with small grooves that allow air to pass through. As coffee is vibrated forward, less dense beans gravitate down the slope, while the densest beans gravitate up the slope. 

4. Color Sorter The final step in free coffee grading, is to screen out any off color beans. Green coffee is loaded into the machine, which uses high scan cameras to reject impurities as the coffee passes through the machine, producing clean coffee, graded to quality, and ready for export. 

Color Sorter 

The final step in green coffee grading, is to screen out any off color beans. The color sorter uses high scan cameras to reject impurities as the coffee passes through the machine. After completing this process, the coffee is clean, and ready for export.