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Saturday: 9AM - 4PM
Short answer: A double layer roll forming machine stacks two complete roll sets on one base frame, one above the other, and runs one deck at a time. It buys floor space and capital, not extra hours. A standard build forms 0.3 to 0.8 mm coated coil at 8 to 15 m/min across 16 to 22 stands per deck.
Most buyers arrive expecting two profiles at once. Almost no double layer roll forming machine does that. The drive, the hydraulic station and the cut off are shared, and a clutch locks one deck in gear while the other sits idle. You get the flexibility of two machines with the output of one.
That trade suits a workshop selling two profiles to one market. It is a bad deal for a plant already running two shifts of a single profile. What follows is the difference, the numbers behind it, and the coil mistake that costs the most money on a double layer roll forming machine.
Six modules make up a double layer roll forming machine. Coil enters at one end, finished sheets leave at the other, and one operator runs the panel.
Deck selection is a lever on small frames and a hydraulic shift on large ones. A dog clutch engages the drive shaft of the deck you want. On 7.5 kW builds the same job happens from the control panel, which is easier on the operator and harder on the wallet.
Changeover on a double layer roll forming machine runs 10 to 20 minutes, and little of it is spanner work. Most is verification: the live path is the one you think it is, the coil gauge matches that deck, the cut length matches the profile. Skip the check and you scrap the first two sheets of every batch.
Why not run both decks of a double layer roll forming machine together? One main motor, one gearbox, one chain set, one hydraulic unit. Two decks at once need double the installed power, two cut offs and a control system tracking two strip paths. That machine exists. It is two lines sharing a frame, and it costs about what two lines cost.
Cutting decides whether a double layer roll forming machine holds tolerance. A post cut shear rides the strip and cuts on the fly, so the mill never stops between sheets, and length holds to plus or minus 1.5 mm over 3 m. On the lower deck, chip clearance matters more than on a single layer line, because the shear sits close to the base plate.
The frame and the drive repeat across every build. The roll sets and the side guides do not, which is why one workshop can serve a whole market with the same double layer roll forming machine and different tooling.
| Pairing | Upper deck | Lower deck | Where it sells |
|---|---|---|---|
| Corrugated plus trapezoidal | 762 mm corrugated | 1000 mm trapezoid | Africa, Middle East, GCC |
| IBR plus corrugated | 686 mm or 890 mm IBR | 762 mm corrugated | Southern Africa |
| PBR plus AG panel | AG panel | R panel | US and Canada, 42 to 43 inch coil |
| Roof plus wall cladding | 1000 mm trapezoidal | 1000 mm wall profile | Europe, Australia |
| Tile plus corrugated | 1000 to 1200 mm tile | 762 mm corrugated | Residential and retrofit |
Two rules decide what goes on top. Put the deck you service least on the bottom, because lower deck access is tighter on every frame we build. Then balance the load: the heavier roll set belongs low so the frame stays stable at full coil width.
Pairing also decides the trim bill. A 1250 mm coil feeding a 1000 mm trapezoid leaves 250 mm in ribs and edge trim, which is 20 percent of the steel. Quote both decks together, or the second profile on a double layer roll forming machine will look cheaper than it is.
Profile pages with full dimensions: corrugated sheet, IBR sheet, widespan trapezoidal, metal roof tile and standing seam. The parent metal sheet roll forming machine page lists the family.
These are the numbers on our standard double layer roll forming machine. Station counts are per deck, not for the machine as a whole, and thickness at the top of the range is a different machine from thickness at the bottom.
| Parameter | Standard build | Effect on the line |
|---|---|---|
| Coil width | 1000 to 1250 mm | Roll face width and guide travel |
| Material thickness | 0.3 to 0.8 mm | Roll gap, motor size, cut force |
| Yield strength | 235 to 550 MPa | Stand count and shaft stiffness |
| Forming stands | 16 to 22 per deck | Surface finish and rib accuracy |
| Shaft diameter | 70 to 80 mm, 45# steel | Deflection at full width |
| Roller material | 45# forged, chrome 0.05 mm | Coating wear on painted coil |
| Main motor | 5.5 to 7.5 kW | Speed at maximum thickness |
| Hydraulic station | 4.0 to 5.5 kW | Cut cycle and decoiler options |
| Running speed | 8 to 15 m/min | Output per shift, per deck |
| Control | Panasonic or Siemens PLC, touch HMI | Length tolerance and batch count |
| Length tolerance | plus or minus 1.5 mm per 3 m | Site fit and waste |
| Electrical supply | 380 V, 50 Hz, 3 phase | Generator sizing on site |
Above 0.8 mm at 1250 mm width, ask for the 90 mm shaft and an 11 kW motor. Frame, clutch and cutter all grow with it. A 1.2 mm double layer roll forming machine built on a 0.5 mm frame is the most common specification mistake we see, and it usually comes from copying a single layer datasheet.
Speed matters too. A double layer roll forming machine with two decks on one 7.5 kW motor runs 8 to 15 m/min empty and settles near 10 to 12 m/min on 0.5 mm painted coil, because the idle deck still carries weight on the shaft train.
The two decks rarely run the same gauge. Set each to its own band and label the coil racks to match.
| Deck | Material | Thickness band | Yield | Coil width |
|---|---|---|---|---|
| Corrugated upper | GI, PPGI | 0.18 to 0.40 mm | 235 to 350 MPa | 914 to 1000 mm |
| Trapezoidal lower | PPGI, Galvalume | 0.35 to 0.70 mm | 235 to 450 MPa | 1000 to 1250 mm |
| IBR upper | PPGI, GI | 0.30 to 0.80 mm | 235 to 550 MPa | 940 to 1250 mm |
| Tile lower | PPGI, aluminium | 0.40 to 0.60 mm | 235 to 350 MPa | 1000 to 1250 mm |
| Wall cladding | PPGI, PPGL | 0.30 to 0.60 mm | 235 to 450 MPa | 1000 to 1250 mm |
The expensive mistake is feeding trapezoid coil into the corrugated deck. A 0.7 mm strip forced through rolls set for 0.3 mm does not just form badly. It marks the roll faces, and a marked roll transfers that mark to every sheet after it. We have seen one wrong coil take a roll set on a double layer roll forming machine out of service for a week of polishing.
Label racks by deck, not by colour. Prepainted coil comes in more colours than most workshops have decks, and colour tells you nothing about gauge.
The saving is measurable. So is the cost. Put both on one sheet before you sign a double layer roll forming machine order.
| Item | Two single layer lines | One double layer machine |
|---|---|---|
| Floor space | Two footprints plus two coil racks | One footprint, 40 to 50 percent less |
| Capital outlay | Two decoilers, cabinets, hydraulic units | 20 to 30 percent lower |
| Output | Both profiles at the same time | One profile at a time |
| Operators | One per line at peak | One for both decks |
| Changeover | None between profiles | 10 to 20 minutes per switch |
| Downtime | Independent per line | Coupled, one fault idles both |
| Service access | Open on both sides | Lower deck reached inside the frame |
That last row is the one buyers underrate. A double layer roll forming machine is taller than a single line, the lower deck sits between mid plate and base, and clearing a jam there takes longer than on a standalone machine.
Our view is blunt. Under 400 square metres of workshop, or with a 30 kW supply cap, the double layer roll forming machine is the only way to sell two profiles. With floor space and healthy power, two single lines out produce it every month of the year.
There is a volume where the double layer roll forming machine stops paying. Ours sits near 500 t a month across both profiles combined.
Run the arithmetic. At 0.5 mm and 1250 mm, a tonne of coil is about 204 m of strip, so 500 t is roughly 102 km. At 12 m/min that is 8,500 running minutes, or about 18 eight hour shifts. Two profiles filling 18 shifts a month fit it well. Thirty shifts do not, because every hour lost to a shared fault comes off both products at once.
Below the line the double layer roll forming machine wins on capital and space. Above it, a second single line wins on throughput and risk. The number is not a law. It moves with your selling price and shift pattern, but it beats a brochure claim about saving half of everything.
Four of these ship on most double layer roll forming machine builds. The rest are quoted per project, and each moves the delivered price by a known order of magnitude.
| Item | Standard | Optional |
|---|---|---|
| Decoiler | 5 t manual | 5 t or 10 t hydraulic |
| Drive | Chain drive | Gearbox per deck |
| Deck shift | Manual clutch lever | Pneumatic or hydraulic shift |
| Cutting | Hydraulic post cut shear | Servo tracking cut for high speed |
| Product handling | Unpowered runout table | Auto stacker |
| Roller material | 45# steel, chrome plated | GCr15 bearing steel |
| Bearings | HRB | SKF, FAG, NSK |
| Control | Push button plus counter | Touch screen, batch memory, remote support |
Two options pay back fastest on a double layer roll forming machine. A hydraulic decoiler removes the manual coil load and the ten minute change with it. An auto stacker protects the paint film on the last sheet of every stack, which is the sheet the customer inspects before he pays.
Send four things and the quotation for a double layer roll forming machine stops being a guess.
From that we build both roll sets in Copra, simulate the flower pattern for each deck, and confirm stand count before any steel is cut. If one profile is not in our library, the customized profiles page lists what the drawing has to contain, and the metal sheet machine brochure has the full frame and option catalogue.
Feedstock usually starts at the slitting line, which cuts master coil to the two widths your decks need. Buying one master width and slitting it yourself often makes a double layer roll forming machine viable, because both decks then run from one coil purchase.
We have built roll forming machines since 2005, with 80+ engineers and technicians and 500+ machines across 50+ countries, under ISO 9001 and CE. Profiles built to a national standard are checked against it before shipment. For the US and Canadian market, the Metal Building Manufacturers Association publishes the panel and load tables your customers quote back at you. Roofers work to NRCA detailing practice, and the American Galvanizers Association covers the zinc coating side of the specification.
Where the roof needs trims, the ridge cap machine is usually bought with the double layer roll forming machine, so ridge, barge and pan come off matched tooling.
Q: Can a double layer roll forming machine run both profiles at the same time?
Q: How much floor space does a double layer machine save?
Q: What is the production speed of a double layer roll forming machine?
Q: How long does it take to switch decks?
Q: Can each deck run a different steel thickness?
Q: Can I add a third profile later?
Q: How much maintenance does the lower deck need?
Q: Is a double layer roll forming machine worth it under 500 tonnes a month?
Last updated: 2026-11-02
Article Changelog
2026-11-02: Full rewrite of page 763. Replaced the 2025 copy, added the deck selection and clutch sequence, five profile pairings with markets, a 12 row specification table, thickness bands per deck, a duplex against two lines comparison, the 500 tonne volume rule, an eight question FAQ and a changelog footer.
Next Review Triggers
New deck pairing released for the US or GCC market
Coil price movement above 15 percent
Change in the standard frame height or shaft range
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