Fruit Sorting Machine Manufacturers
Connect with verified fruit sorting machine manufacturers on Towobo. Source optical colour sorters, weight graders, size and diameter graders, and automated inspection systems for fresh fruit and vegetable post-harvest handling and processing.
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Browse Fruit Sorting Machine Suppliers →Fruit sorting technology — methods and machine types
Modern fruit sorting combines multiple sorting criteria — size, weight, colour, surface defect detection, and internal quality — in integrated automated sorting lines. Key sorting machine types include: size graders (mechanical sizers — slotted roller or belt systems that separate fruit by diameter); weight graders (each fruit is weighed individually and diverted to a lane based on target weight range — standard in apple, pear, citrus, and mango packing); colour sorters (optical cameras and near-infrared (NIR) sensors detect surface colour and surface defects — unacceptable fruit is diverted by air jets or mechanical deflectors); defect inspection systems (multispectral or hyperspectral imaging detects bruising, mould, cuts, and other surface and sub-surface defects invisible to a single-spectrum camera); Brix (sugar content) graders using NIR sorting — available for some fruit types, allows sorting by internal sweetness. Post-harvest sorting lines for fresh fruit export combine these stages in a single conveyor system, grading by weight, colour, and defect in a single pass at throughputs of 2–15 tonnes per hour depending on fruit type and line configuration.
Frequently asked questions
What is the difference between a size grader and a weight grader for fruit?
A size grader (mechanical sizer) separates fruit into size classes based on diameter — fruit rolls along a series of bars or rollers with progressively increasing gaps; smaller fruit falls through earlier gaps. Size graders are simple and low-cost but do not account for shape variation. A weight grader individually weighs each piece of fruit and allocates it to a lane based on its actual weight. Weight grading is more precise for export specifications where weight tolerance is tightly controlled. For dense uniform fruit (apples, citrus), weight grading is preferred for premium export markets. For irregular-shaped or soft fruit where mechanical size grading might cause damage, non-contact optical sizing (camera-based area estimation) is used.
Can an optical sorter detect internal defects in fruit?
Standard optical colour sorters detect surface defects only. Near-infrared (NIR) technology can detect some sub-surface conditions (bruising, water core in apples) that are not visible to the naked eye or a standard RGB camera, because NIR light penetrates a few millimetres below the skin surface. Full internal defect detection (for example, detecting internal breakdown, seed detection, or internal Brix distribution) requires X-ray inspection or a full near-infrared transmission system. These technologies are available on high-specification fruit sorting lines for premium markets. For most commercial fruit sorting applications, surface optical inspection combined with weight grading is the standard.
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