Weight Grader Machine Manufacturers
Connect with verified weight grader machine manufacturers on Towobo. Source dynamic weight grading systems, multi-lane fruit and vegetable weight sorters, and egg grading machines for commercial weight-based food product sorting.
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Browse Weight Grader Machine Suppliers →Weight grader machines — design and food applications
A weight grader sorts individual food items by their individual weight, routing each item to the appropriate weight-grade discharge lane. Weight graders use dynamic weighing — items are individually weighed as they pass along a conveyor over a high-speed weigh cell or platform, and a pneumatic ejector or diverter directs each item to the correct weight-grade lane based on the measured weight. Weight graders are used for: fresh fruit (mangoes, avocados, citrus, apples — supermarket buyer specifications typically include weight range by count per carton, e.g. count 8 = maximum 8 fruits per 4 kg carton — the grader sorts to these weight ranges); eggs (egg graders weigh each egg and sort by weight class: very large, large, medium, small, etc., as defined by EU or relevant national standard); other individual items where a weight specification is defined by the buyer (tomatoes, onions, peppers, potatoes).
Frequently asked questions
What weighing accuracy is typical for a dynamic weight grader?
Dynamic weight graders measure the weight of individual items as they move along a conveyor at production speed. The weighing accuracy of dynamic weight graders depends on the machine design, the product (shape, uniformity, movement stability on the conveyor), and the conveyor speed. Typical accuracy for a well-maintained dynamic weight grader in a fresh produce application is ±5–10 g for individual fruit items weighing 100–500 g — this is sufficient for retail weight grading where grade boundaries are typically 25–50 g apart. For high-value or precision applications, accuracy requirements should be stated in the machine specification and verified by calibration testing with samples of known weight before purchase and at regular intervals in production. Dynamic weight graders should be calibrated with certified weights and the calibration documented as part of a weighing equipment management programme.
Can a weight grader also detect under-weight or over-weight items for food safety?
Weight graders can be configured to detect and reject under-weight items (below minimum fill weight — relevant for pre-packed produce sold by weight, where under-weight items would be a trading standards violation) and over-weight items (above maximum acceptable weight for a grade). However, weight graders are not typically used as a primary food safety tool — that role is performed by metal detectors, X-ray systems, and physical contamination inspection steps. A weight grader that also has a checkweigher function (verifying that each finished pack is within the declared net weight range) is a different machine — a dynamic checkweigher or combination weigher-checkweigher used on packed product at the end of the line. These are different applications and different machine categories.
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