The fruit name is a shorthand, not a feed specification
A quotation request often begins with a fruit name and a product name: peach puree, mango pulp, passion fruit juice. Those words are useful for a first conversation, but they do not describe what the first machine actually receives. The equipment sees a particular variety at a particular maturity, with a particular stone, seed, skin and flesh structure, prepared in a particular way.
The FAO's general juice-manufacture chapter makes this point through a fruit-characteristics table rather than a single universal process. Soft all-edible berries are handled differently from firm fruit with inedible seeds, and a mango with soft inedible skin and a large stone is handled differently again from a brittle-skinned passion fruit. The table is a reminder that the preparation route follows structure, not the label on the crate.
Large stones and seeds: separate before reduction
A stone is not a size-reduction problem. Sending intact stones through a rotor crusher can damage the working parts and can add stone fragments to the edible stream. Where the stone must be removed, destoning is a separate duty with its own reject path, its own capacity basis and its own evidence requirement.
The same logic applies to large seeds that are not part of the product. A machine may be able to crush flesh and seed together, but that does not establish that the result is acceptable. The question is whether the intended edible fraction can be recovered while the unwanted fraction leaves through a controlled outlet. That question belongs in the preparation brief before a crusher or pulper is shortlisted.
Peel and rind can define the quality boundary
Peel is not automatically waste, and it is not automatically edible. Mango peel can carry bitter compounds and latex; papaya skin can contribute off-flavours; passion fruit rind is a structural fraction that must be separated from the juicy pulp. A preparation step that works for one fruit may carry the wrong fraction into the next machine when the cultivar or maturity changes.
This is why a fruit-specific reference is more useful than a generic “peeling” claim. The feed boundary should say which fractions are intended to enter the product, which are rejected, and how the reject stream is kept separate. A photograph of a machine cannot answer that question; a written material balance and a sample can.
Small seeds and fibre need a target, not a generic screen
Small seeds, stone cells and fibrous flesh are harder to describe than a large stone because they can pass through openings that were chosen for a different purpose. A pulper screen that retains one fruit's seeds may let another fruit's seed fragments through, or may retain so much edible fibre that the product texture changes.
The target product is the deciding factor. A clear juice, a cloudy juice, a smooth puree and a textured pulp do not share one particle specification. The screen, the rotor arrangement and the finishing stage should be selected against a measured target and checked with the actual feed. A catalogue description can identify the duty; it cannot certify the result on a new fruit.
Write the edible feed boundary before the equipment list
The most useful line in an enquiry may be the least technical: what exactly do you intend to sell? If the product is a strained juice, the edible boundary is the liquid released from the flesh. If it is a puree, the boundary may include fine pulp and some fibre but exclude skin, stones and coarse seed fragments. If it is a pulp for blending, the retained particle profile may be part of the product identity.
Once that boundary is written, the preparation route becomes reviewable. Whole fruit may need washing and inspection before any size reduction. Stone-bearing fruit may need destoning before pulping. Fruit with adhering skin may need a preparation step that separates peel without crushing it into the product. None of these choices is settled by the fruit name alone.
Trial evidence for preparation
A preparation trial should preserve the link between the feed and the fraction that leaves each outlet. Record the variety, maturity, size range, stone or seed condition, peel condition and the way the fruit was trimmed or cut. Then record the machine configuration, the screen or gap, the throughput basis and the condition of both the accepted product and the reject stream.
Matched samples matter more than a single attractive product photograph. A low reject rate can mean efficient recovery, or it can mean that unwanted material stayed in the product. A high recovery can mean a good separation, or it can mean that the next machine will be asked to handle a feed it was never selected for. The trial should show both streams and state how each was assessed.
What to send with the enquiry
Send the fruit family and variety if known, the maturity and condition at reception, the preparation steps already available, the product identity, the intended particle or clarity target, and the destination of stones, peel, seeds and other rejects. Add a representative sample and the measurement methods used for texture, solids or particle size.
The answer should identify the equipment duty and the assumptions behind it, not only a model name. Fruit structure changes between cultivars and seasons, so the trial plan and the acceptance record are part of the equipment requirement. The machine is selected for the material at its inlet, not for the word printed on the outside of the crate.
Sources and scope
- FAO, Principles and practices of small- and medium-scale fruit juice processing, Chapter 6
General unit operations and a fruit-structure table linking preparation routes to edible and inedible fractions. Historical technical background, not a current process guarantee.
- FAO, Principles and practices of small- and medium-scale fruit juice processing, Chapter 15
Tropical-fruit examples covering mango, passion fruit, guava, papaya and banana preparation. Example conditions are not transferred to this site as equipment ratings.
Sources are cited for technical context. They do not certify a machine, a capacity or a process guarantee for a particular project. External pages were reviewed on 28 October 2026.