Salad is the most damage-sensitive product in the catalog, so this line uses gentle movement, triple washing and controlled dewatering to turn lettuce and leafy greens into ready-to-eat leaves for modified-atmosphere packing.
What the ready-to-eat salad line produces and who it fits
The line produces washed, cut and dewatered leafy greens for retail modified-atmosphere packs, food service and central kitchens. It fits a processor who sells ready-to-eat salad and must meet the microbial specification and shelf life that retail demands, which is what makes this line different from a simple washer.
The microbial specification is the real spec
A ready-to-eat salad carries its safety risk in the wash water, so the line invests in water disinfection, residual moisture control and gentle handling rather than raw speed. If your market enforces a microbial limit, say so early; it changes the wash stages and the documentation package.
What the retail customer measures
Retail measures shelf life, absence of bruising and a consistent leaf size, then the microbial count. The line is configured to hit those visible measures first, because a bruised leaf fails at the shelf even if it tests clean.
Process flow, stage by stage
The route is inspect, shred, triple-wash and dewater, then hand off to modified-atmosphere packing. Each stage is gentler than its root-crop equivalent because a leaf cannot take the impact a carrot can.
Inspect and trim
Damaged leaves and foreign material are removed before cutting.
Shred to size
Leaves are cut to the retail format with minimal bruising.
Triple wash
Three wash stages remove soil and reduce microbial load with disinfection control.
Dewater and pack
Surface water is removed before modified-atmosphere packing.
Why three washes instead of one
Three stages let each wash do one job: the first removes heavy soil, the second finishes cleaning, and the third applies the disinfection step at a controlled residual. Splitting the duty is more reliable than forcing one long washer to do all three.
The dewatering handoff
The dewatering step removes the surface water that would otherwise shorten shelf life and make the pack soggy. The residual moisture target is set with the packing line, because the MAP process depends on a predictable leaf condition.
| Materials | Lettuce, romaine, kale, spinach, arugula and mixed leaves |
|---|---|
| Capacity | 500 kg/h |
| Finished product | Washed fresh-cut salad in MAP packaging |
Key sizing decisions and how the line is balanced
Salad lines are usually sized to the washed-and-packed weight you can sell per shift, not to the raw intake. The bottleneck is typically the gentle handling limit, because pushing a leaf line faster usually means bruising it.
Throughput is set by gentleness
A salad line cannot be sized like a root line; the leaf's damage tolerance caps the speed. We size the line to the output that keeps bruising below the retail threshold, then balance the wash and dewater stages to that rate.
Water renewal and disinfection
Fresh-cut washing typically uses around 2 to 11 m³ of water per tonne of product, with filtration and recirculation lowering fresh-water demand. Disinfection, ozone with a controlled residual or chlorine-based per local regulation, is sized to the water flow and the target microbial limit.
Raw material, incoming condition and yield
Salad yield is decided at intake: wilted, bruised or over-mature leaves do not recover in the line, and they drag the whole batch down. The incoming condition therefore sets both the inspection labour and the realistic output.
Leaf condition and field heat
Leaves that arrive with field heat or damage wilt faster and bruise more in the washer. Cold chain discipline at intake is part of the line's performance, because no washer can restore a leaf that was already degrading.
Inspection and trim loss
The inspection stage removes the leaves that would fail retail, and that trim is part of the yield calculation. Declaring the incoming quality honestly keeps the yield estimate and the inspection headcount realistic.
Quality, shelf life and food safety
Shelf life is the product's currency, and it is set by three controls: wash-water disinfection, residual moisture and cold handling. The line is designed so each control can be verified, not just claimed.
Disinfection and residual control
The disinfection stage holds a controlled residual, with ozone per QB/T 5218-2018 or chlorine-based dosing per local regulation. The control is documented because a retail audit will ask how the residual is monitored, not just whether it exists.
Hygiene and documentation
The line follows EHEDG and 3-A hygienic design principles with cleanability reviewed against EN 1672-2, food-contact surfaces in SS304 as standard, and declarations for FDA 21 CFR and EU 1935/2004 / 10/2011 available. The design supports HACCP, ISO 22000, FSMA and BRC programs.
| Food-contact material | SS304 standard; SS316 optional for high-chloride or acid duty |
|---|---|
| Surface finish | Ra ≤ 0.8 µm hygienic finish available on food-contact surfaces |
| Hygienic design | EHEDG / 3-A design principles; cleanability per EN 1672-2 |
| Food-contact compliance | FDA 21 CFR and EU 1935/2004 / 10/2011 declarations available |
| Certification | CE marking and destination-specific certificates on request |
| Food safety support | Design supports HACCP, ISO 22000, FSMA and BRC programs |
| Wash stages | Three-stage counterflow with a final potable rinse |
|---|---|
| Optional disinfection | Ozone ≈0.6 ppm in wash water or an approved sanitizer |
| MAP | N₂/CO₂/O₂ ratio set per leaf blend; target shelf life 7–14 days |
| Temperature zones | Preparation ≤10 °C and packing ≤5 °C (GB 31652-2021 / HACCP reference) |
Utilities, footprint, staffing and how to spec the project
A salad line needs clean water, drainage, chilled space and enough room for hygiene zoning between raw and packed product. These site facts shape the layout more than the machines do, so they belong in the first brief.
Water, drainage and cold chain
Water quality and drainage are hygiene controls, not conveniences, and the chilled packing area must connect to the line without breaking the cold chain. Plan the raw-to-packed product flow so clean and dirty zones never cross.
Acceptance criteria to agree
Agree the wash result, the residual moisture, the bruising threshold and the microbial limit the line must meet on your own material. Those criteria, tested at commissioning, are the contract that makes the quotation hold.
Because retail salad runs on short shelf-life cycles, the acceptance trial should also observe how the leaves hold up over the target shelf life under your cold-chain conditions, not just how they look on the day of the test.
| Reference capacity | 500 kg/h |
|---|---|
| Power supply | 380 V / 50 Hz, three phase (60 Hz / 440 V available) |
| Food-contact material | Stainless steel SS304 (SS316 available for high-chloride duty) |
| Control | PLC with touch screen and overload protection |
| Warranty | 12 months on main components |
- Leaf crop, incoming condition and field heat
- Cut format and retail pack size
- Target washed-and-packed output
- Microbial limit, disinfection and water quality