Sweet potatoes have become part of our daily diet, expanding their popularity in the global markets. According to a new study, the sweet potato market will enjoy an annual growth rate of 6% in 2022-2029, reaching a value of $68 billion in 20291.
We should not take this market growth for granted: sweet potatoes need a lot of careful handling in order to get from the fields and all the way to us, as they are unique with a variety of shapes and delicate skin.
Studies found that there is a significant postharvest loss due to difficulties in handling. Specifically, the processes of sorting and packaging sweet potatoes come with a high risk of skinning, bruises, cuts and broken ends2. This is why a smart and elaborate sorting and packaging line is needed.
Hartma, in partnership with Assatec Robotics and NSIX Vision, has created automated packaging processes that are ideal for sweet potatoes. With a unique software and robotic dispatcher, the sorting machines pick up a specific product on the conveyor and place it in boxes, so that all sweet potatoes are nicely arranged.
This process relies on image analysis from three 3D cameras – one above the input conveyor and two more above the box. The 3D vision system provides optimal position for each potato. The entire cycle of guided pick & place of one sweet potato takes just 1.2 seconds.
The robot is able to grab the sweet potatoes of different shapes at a high speed, thanks to adaptive pressure control and flexible fingers. This achieves fast, elegant and reliable pick & place operation and allows for a gentle and yet efficient way to sort and pack sweet potatoes of all shapes and sizes.
