Industrial Food Grading Machine Manufacturers
Connect with verified industrial food grading machine manufacturers on Towobo. Source weight graders, size graders, optical colour sorters, and multi-criteria grading systems for commercial fresh produce, fruit, vegetable, egg, and food ingredient grading.
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Browse Industrial Food Grading Machine Suppliers →Food grading machines — overview of technologies
Food grading separates a mixed product stream into grades (classes) based on defined quality criteria. The main grading criteria and corresponding technologies are: size grading (separation by physical dimension — see size graders page); weight grading (separation by individual unit weight — see weight graders page); colour sorting and optical grading (separation based on detected colour, shape, or surface appearance — see colour sorters and optical sorting machines pages); and multi-criteria grading lines (combining two or more of the above technologies in a single line — the product passes through a sequence of grading stages, with each stage separating out one grade or removing defects based on the relevant criterion). This page provides an overview of the food grading machinery category — for specific technologies, use the dedicated pages linked below.
Frequently asked questions
What grading criteria are used for export fresh produce?
Export fresh produce grading specifications are typically set by the buyer (retail chain or importer) and may reference standard grades (e.g. EU marketing standards for fresh fruit and vegetables; US grade standards from USDA). Common grading criteria for export fresh produce include: size (minimum and maximum diameter, or weight range per unit — buyers specify size codes or count-per-carton); colour (the proportion of the fruit surface that has reached the required colour — for tropical fruit like mango and avocado, this includes ripeness maturity assessment); blemishes and defects (maximum permitted area of surface blemishes, bruising, russeting, or pest damage — typically expressed as maximum area in cm² or as a percentage of the fruit surface); and firmness (for produce with a firm maturity stage, minimum firmness by penetrometer reading may be specified). The grading specification should be confirmed with the buyer before purchasing grading equipment.
Can one grading machine handle multiple different food products?
Many food grading machines are designed for specific product types — a packing line for apples uses a different conveyor surface, cup, and sensor system than a grading line for eggs or citrus fruit. However, some weight graders and size graders can be adjusted for different products by changing the cups, pockets, or grading screen apertures. Before purchasing a grading machine for multiple products, confirm with the supplier that the machine has been tested on each product type you intend to grade, and ask for performance data on each. Machine changeover time and cleaning requirements between different products should also be assessed — if the changeover is complex or time-consuming, separate machines for each product type may be more practical.
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