Key Technology 14-roller Precision Size Grader

Key Technology expands its family of rotary sizing and grading systems for green beans, which includes its Sliver Sizer Remover (SSR), Precision Size Grader (PSG) and Rotary Size Grader (RSG). With the 14-roller PSG, processors can replace drum graders with minimal impact to surrounding equipment. It provides four rollers more than previous systems to improve grading performance. The PSG separates beans by diameter, maintaining accuracy over time to help processors make grade while maximising yield.

Suitable for grading snipped and unsnipped whole and cut green beans for fresh pack, frozen and canned product applications, the rotary sizing and grading systems are available in widths of 0.6 to 1.5 m.

PSGs offer a smaller footprint than drum graders with the same throughput, while achieving gentle handling and reducing maintenance. They hold the grade over time, which improves final product quality and increases yield. With an open design, fully welded frame and one-piece block pan, they are said to enhance sanitation.

The PSG separates green beans by diameter. Featuring a series of rollers with gaps in between, thin and curled beans fall through as thicker beans are conveyed across the top. The rollers spin at progressive speeds. Rollers are faceted and textured to create gentle agitation so product is lively across the top to either find a gap or roll along.

The gaps between the rollers of the PSG are easily adjusted to change the diameter threshold to modify the grade or process different green bean varietals or other products such as potatoes or carrots. Rotating the single handle quickly adjusts all the gaps consistently throughout the machine to grade by a new size cross section. The PSG can be adjusted and cleaned to handle a new grade or product in less than 10 min.