Persimmons are highly valued for their brown flesh, smooth texture, and rich vitamin A, vitamin C, and dietary fiber. They are widely grown in countries such as Spain, Italy, and Israel. To ensure their quality and market value, the sorting process is crucial. Currently, the industry mainly uses two basic sorting methods: weight sorting (based on physical characteristics) and optical sorting (using advanced imaging technology).
Weight sorting is a basic and widely used method. The principle is simple: a high-precision weighing sensor measures the weight of individual persimmons. Then, a conveyor belt automatically guides the persimmons to the corresponding channel according to a preset weight range (e.g., >200g, 150-200g, <150g). The main advantages of this method are relatively low cost, ruggedness, and easy maintenance and operation. For producers and packers with limited budgets and moderate production volumes, or those who focus on basic size consistency for standard markets, weight sorting is a very cost-effective solution that can effectively improve the visual consistency of products.
Optical sorting is a technology-driven and refined screening method. These systems are equipped with high-resolution cameras and advanced spectral sensors. As the persimmons quickly pass through the inspection area, the system immediately captures multi-dimensional data: precise size, shape contours, surface color uniformity, defects (bruises, spots). Its core advantages lie in its powerful multi-dimensional quality identification capabilities and efficient non-destructive sorting. It enables extremely accurate classification to meet the stringent quality requirements of high-end markets. Its high level of automation significantly increases the yield and value of high-quality fruits.
In summary, both sorting methods have ideal application scenarios. Weight sorting is cost-effective, rugged and durable, and is the best choice for small and medium-sized growers, those with limited budgets or those who focus on basic size grading. Optical sorting, with its unparalleled accuracy and efficiency, is designed for large producers, high-end brands and export-oriented companies, helping them stand out in a highly competitive market with excellent and consistent internal and external quality. Growers should carefully choose the most suitable sorting "tool" according to their own scale, target market positioning and investment budget to maximize their profits in the natural persimmon value chain.