English 
Zhengfeng Road, Licheng District, Jinan City, Shandong Province,China
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Product Description
A complete French fries production line is not one machine but a sequence of about thirty stations that must hold the same rhythm from the raw potato bin to the sealed carton. The layout below is the configuration we build for a rated output of 1,000 kg/h of finished product — the same sequence we size for smaller and larger capacities by adding or removing parallel units rather than redesigning the process.
Raw potatoes are lifted into the line by a water bucket elevator (3,500 × 800 × 1,600 mm, 1.5 kW, Schneider electricals with Siemens variable-speed drive) and discharged into two brush-roller potato peeling machines running in parallel. Each peeler carries seven abrasive brush rollers and two carborundum rollers over a water collection tray, and uses a screw to push product through so the residence time — and therefore the peel loss — stays adjustable. Frame tubes are 80 × 40 × 4 mm SUS304 with 5 mm plate. Dry peeling followed by washing, rather than lye or steam peeling, is what keeps the surface of the strip clean without cooking the outer layer before the fryer sees it.
The peeled potatoes pass to a picking line where operatives remove stones, green tubers and any residual material before cutting. The belt is food-grade PVC on 2 mm SUS304 plate with a Siemens speed-controlled motor (0.75 kW, 380 V / 50 Hz), so the inspection speed can be matched to the shift's throughput rather than fixed at the line rate.
This is the station where most French fries lines are under-specified. Cuts are made by a hydro cutter — a continuous water-knife machine in which potatoes are accelerated in a water stream and pass a fixed blade set, so there is no mechanical press, no blade-to-product friction and no progressive blade wear. Maximum product diameter is 100 mm (4 in), customisable to 120 mm; the blade set is USA-brand hardened stainless on a quick-change block with dual-chamber redundancy, and process water is recirculated at low loss through a SUS304 food-grade body.
Rated capacity is 5,000 kg/h in the industrial-standard configuration, up to 20,000 kg/h in the high-volume configuration. On a 1,000 kg/h line this means the cutting station covers the requirement with substantial headroom — continuous water-knife cutting that covers the 1 t/h requirement with headroom, so the same station absorbs capacity added later without being replaced. A single continuous cutter also replaces the bank of parallel blade cutters such lines usually need.
Cut strips drop into a de-stoning unit (20 brush rollers, 2.2 kW, 2,400 × 900 × 1,300 mm, 50 × 50 × 2 mm SUS304 frame with 3 mm plate) that lifts away loose starch and any remaining foreign matter, then fall directly into a bubble washing machine. The washer uses a 1,000 mm belt with 3 mm mesh apertures and a Siemens speed-controlled motor (6 kW, 380 V / 50 Hz) over a 6,000 × 1,000 × 1,300 mm tank; the turbulence keeps strips in motion so surface starch is carried away rather than settling back onto the product.
Blanching is carried out in two consecutive electric-heated blanching machines (7,000 × 1,000 × 1,300 mm and 8,000 × 1,000 × 1,300 mm) rather than one long tank. Each runs a 1,000 mm belt with 3 mm mesh and a Siemens speed-controlled drive at 1.5 kW, 380 V / 50 Hz, and each carries 60 mm of insulation to hold temperature and cut standing losses. Water temperature is controlled, and the two-stage arrangement lets the line hold a defined time-temperature profile at 1,000 kg/h without the tank becoming impractically long — the stage where a single-tank line most often loses control of its own schedule.
Strips leave blanching and drop into a pre-cooler (6,000 × 1,600 × 2,300 mm, 2.2 kW, 1,000 mm belt with 3 mm mesh) which arrests cooking at the surface and firms the strip — the step that most affects both texture and how much oil the fryer subsequently takes up. From there a dewatering line with a four-turn belt (6,000 × 1,000 × 1,600 mm, 12 fans × 0.75 kW, 6.35 kW total, water collection tray underneath) blows free surface water off, followed by a hot-air drying line in SUS304 (3 mm plate, 1,200 mm belt, 15 kW, 10,000 × 2,000 × 1,800 mm) with Siemens variable-frequency control. Surface water carried into a fryer is one of the most common causes of violent spitting, unstable temperature and accelerated oil degradation.
The fryer is a 8,000 × 1,800 × 2,300 mm continuous frying machine in 4 mm SUS304 with a 1,000 mm belt, a 2.2 kW variable-frequency drive and an automatic lifting hood for cleaning access. Heating is electric as standard, with a diesel-fired option for sites that have no spare electrical capacity. It is fitted with a dynamic oil filtration system that filters continuously during production and discharges slag automatically, so the oil in circulation stays cleaner for longer than with batch skimming. The strip then passes over a vibrating de-oiling unit (1,800 × 1,000 × 1,300 mm, 0.18 kW vibration motor with adjustable amplitude, 4 mm SUS304 on 80 × 80 × 3 mm frame) which sheds surface oil back to the fryer.
After de-oiling, a three-layer air line (9,000 × 1,400 × 1,600 mm, 18 kW, 1,200 mm belt, 2.5 mm SUS304, Siemens drive and Schneider electricals) removes residual moisture, and a three-stage pre-cooler with 75 mm polyurethane insulated panels, four 3 HP compressors and ten fans lowers product temperature ahead of the freezer (8,000 × 1,800 × 2,000 mm). Cooling in stages rather than in one drop protects the internal structure of the strip from thermal shock.
The freezing line runs a 1,500 mm belt through a 20,000 × 2,200 × 2,400 mm tunnel with a 140 kW drive system and two 120 HP two-stage screw compressor units. Drive speed is adjustable, and the electricals are Schneider with Delta inverters. Individual quick freezing at this stage is what allows the product to be packed, stored and later reconstituted without the strips freezing into a single block.
Frozen strips are lifted to a 14-head weighing and bagging machine (4,500 × 2,700 × 4,200 mm, 6 kW, 5–50 bags per minute) that weighs and fills automatically, then pass a metal detector working on electromagnetic induction with 400 mm pass width, 80 mm pass height and sensitivity of Fe ≥ φ1.0 mm / SUS ≥ φ1.5 mm at a belt speed of 10–25 m/min; on detection the belt stops and an audible alarm sounds. A disc seasoning machine (1,200 mm disc, 0.75 kW) applies seasoning where required, and a carton sealer closes cases from 200 × 150 × 130 mm up to 600 × 500 × 500 mm. A 10 m SUS304 operating platform is built to the actual site layout.
Item | Specification |
|---|---|
Rated output | 1,000 kg/h finished product |
Modules | 10, from intake to packing |
Construction | SUS304, 2 / 2.5 / 3 / 4 / 5 mm plate by station |
Electricals | Schneider |
Motors and drives | Siemens variable-speed, 380 V / 50 Hz three-phase |
Cutting station | Continuous water-knife cutter, 5,000 kg/h standard (20,000 kg/h high-volume) |
Blanching | Two electric-heated units, 60 mm insulation, 1,000 mm belt, 3 mm mesh |
Fryer | 8,000 × 1,800 × 2,300 mm, 4 mm SUS304, dynamic filtration with automatic slag discharge |
Freezer | 20,000 × 2,200 × 2,400 mm, two 120 HP two-stage screw compressors |
Packing | 14-head weigher, 5–50 bags per minute |
Metal detection | 400 × 80 mm aperture, Fe ≥ φ1.0 mm / SUS ≥ φ1.5 mm |
The line is configured for French fries and shoestring fries for retail and foodservice, including coated and seasoned variants, and processes fresh or chilled tubers. Strip cross-section and belt speeds are set at specification stage, and the scope can stop at the fryer where freezing and packing are handled at the customer's site.
Three failure points account for most of the yield lost on a French fries line, and none of them is the fryer. Water carried past the dewatering stage is the first: it drops the fryer temperature on contact, extends frying time and accelerates oil breakdown, which is why we put a four-turn air line and a separate hot-air drying line ahead of the fryer rather than relying on a single blower. Losing control of the blanching profile is the second: two shorter tanks hold a defined time-temperature curve far more reliably than one long tank at line rate. Mismatched rhythm between cutting and frying is the third: because the water-knife cutter is sized well above the line, the cutting station never becomes the constraint when upstream supply fluctuates.
Buyers sometimes ask whether one line can produce both French fries and potato chips. It cannot, and the reason is upstream of the fryer. Fries are cut into strips of 8–12 mm and need a blanching stage to set the interior before a relatively long, moderate-temperature fry. Chips are sliced to roughly 1.5–2 mm and need a much shorter, hotter fry, and usually benefit from vacuum frying where colour and acrylamide are critical. The belts, the blancher duty and the fryer geometry all differ, which is why the two are specified as separate lines.
Raw material form (fresh, chilled or frozen) and typical tuber size; target output in finished kg/h; required strip cross-section; heating method for the fryer (electric as standard, diesel optional); available floor area, ceiling height and drainage; and whether the scope includes IQF freezing and packing or stops at the fryer. Give us these six and we will return a sized equipment list with the layout drawn to your building.
Hydro cutter - the cutting module in this line
Potato peeling machines - dry brush-roller peeling ahead of cutting
Blanching machines - the two-stage blanching module
Continuous frying machine - the frying module with dynamic filtration
Oil filtration system case study - a 3 m fryer supplied on the same filtration principle
Chicken dicing line - a six-module solution for fresh meat dicing
What does a complete French fries line include? Intake and dry peeling, picking, water-knife cutting, de-stoning and bubble washing, two-stage blanching, pre-cooling and dewatering, hot-air drying, continuous frying with dynamic filtration, de-oiling, second-stage drying and pre-cooling, IQF freezing, metal detection and packing.
What is the smallest capacity you build? The configuration on this page is rated 1,000 kg/h of finished product. Smaller outputs are built by reducing parallel units rather than shortening the sequence, so the process steps stay identical.
Can the cutting station be upgraded later? Yes. The water-knife cutter is rated 5,000 kg/h in its standard configuration, so capacity added downstream does not require replacing the cutting station.
Which heating method is used? Electric heating is the standard specification. A diesel-fired option is available for the fryer on sites that have no spare electrical capacity.
Do you supply the freezing section? Yes. The scope can stop at the fryer or continue through three-stage pre-cooling, IQF freezing, metal detection and packing.
What electrical supply does the line need? Motors and drives throughout are 380 V / 50 Hz three-phase with Schneider electricals and Siemens variable-speed control. Other voltages are built to order.
To specify a French fries production line for your own output, send us your raw material, target capacity and building constraints — we will come back with a sized configuration and a layout drawing.
