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Corrugated Sheet Roll Forming Machine

762 mm Cover From 914 mm Coil: How the Line Is Sized

Short answer: A corrugated sheet roll forming machine forms flat steel coil into the round wavy roof and wall profile. The standard tool set runs a 76.2 mm pitch and 18 mm wave depth, takes 914 mm coil, and delivers 762 mm cover at 10 to 15 m/min across 24 forming stations.

Most buyers arrive with two numbers: a coil width and a cover width. Those two numbers decide the roll set, the edge guide, and the cutter stroke. A corrugated sheet roll forming machine built on the wrong pair still runs, but the sheets will not lap cleanly on site. This page covers the profile geometry, the coil to cover conversion, the machine modules, and the checks worth running before you sign a purchase order. If you are still comparing profile families, read the parent guide on metal sheet roll forming machines first.

What a Corrugated Sheet Roll Forming Machine Does

A corrugated sheet roll forming machine does one job. It bends a flat strip through a series of driven roll stands until the strip takes the wave section, then cuts it to length. Nothing is welded. Nothing is pressed. The wave comes from the roll gap in one continuous pass.

That is why a corrugated sheet roll forming machine is sized by the profile rather than by the sheet. Sheet length comes from the encoder and the cut signal. Sheet width comes from the roll set and the edge trim.

One property separates corrugated from most other roofing profiles. The roll set does not care how wide the incoming coil is. Change the coil, adjust the feeding guide by hand, and the same line produces a narrower sheet with the same pitch and the same wave depth. No mould change is needed, which is what lets one machine serve several markets.

The Profile Numbers That Set the Whole Line

Five dimensions appear on every corrugated drawing. They are also the five questions a builder has to answer before quoting.

Parameter	Standard corrugated	What it controls
Pitch, wave to wave	76.2 mm (3 inch)	Roll diameter and stand count
Wave depth	18 mm	Roll gap, shaft stiffness
Feed width	914 mm coil	Guide setting, decoiler size
Cover width	762 mm after lapping	Sheet count per roof area
Cover ratio	83.4%	Coil that ends up as sellable width

Two variants sit either side of the standard profile, and the same corrugated sheet roll forming machine runs both once the roll set is swapped. A mini corrugated profile uses a shorter pitch and a shallower wave, which suits residential roofing and the South African market where narrow sheets are still common. A deep corrugated profile pushes the wave past 25 mm for industrial walls and long spans that need stiffness from the section itself.

If your profile is none of these, the roll set is cut from your drawing. Send a section drawing with pitch, depth, cover width, and material thickness, and the corrugated sheet roll forming machine gets built around it. Our customized profiles page covers what that drawing needs to contain.

From Coil Width to Cover Width

On a corrugated sheet roll forming machine, cover width is always smaller than coil width. The difference is the steel consumed by the wave plus the edge trim, and it is fixed by the roll set, not by the operator.

Coil width	Cover width	Width taken by wave and trim	Typical use
1250 mm	1000 mm	250 mm	Wide commercial roofing
1000 mm	838 mm	162 mm	General roofing and walling
914 mm	762 mm	152 mm	Classic 3 inch corrugated, export markets

On the 914 mm coil the loss is 16.6 percent. That number belongs in your costing sheet, because it decides how much coil you buy per square metre of finished roof. The full method sits in our guide to coil width calculation. Confirm the cover width on a section drawing before ordering, since two profiles with the same pitch can trim differently at the edge, and a 5 mm error at the lap becomes a leak path on a finished roof.

What Sits on a Corrugated Sheet Roll Forming Machine

Every corrugated sheet roll forming machine we build follows the same sequence, whether it runs 10 m/min or 15 m/min.

Hydraulic decoiler, 5 tonne, for coil handling and mandrel expansion
Feeding and guiding unit with hand wheel edge adjustment
Roll forming mill, 24 stations on an H beam welded frame
Hydraulic cutting device with Cr12MoV blade and PLC length control
Control cabinet with touch screen, encoder, and inverter
Run out table, two pieces, angle steel frame

The decoiler is where most problems on a corrugated sheet roll forming machine start. A coil that expands unevenly pulls the strip off centre, and the guide then has to correct a fault it did not create. Our guide to decoiler types explains when a hydraulic mandrel is worth the extra cost over a manual one.

Technical Specification

The table below is the configuration we build most often for 0.4 to 0.8 mm galvanized coil. Values change with material thickness and profile depth.

Section	Item	Specification
Decoiler	Type and capacity	5 t hydraulic, welded steel plate and beam frame
Decoiler	Mandrel and coil size	Expansion 480 to 560 mm, coil ID 508 mm, OD up to 1350 mm
Decoiler	Decoiling speed	0 to 15 m/min, Yaskawa inverter
Feeding	Feeding width and guide	600 to 1450 mm, manual side hand wheel
Forming	Stations and thickness	24 forming steps, 0.4 to 1.6 mm
Forming	Shaft and roller	40Cr shaft 80 mm, 45 steel roller with 0.05 mm chrome
Forming	Main motor and speed	5 kW chain drive, 10 to 15 m/min
Cutting	Blade and tolerance	Cr12MoV, HRC 60 to 62, plus or minus 5 mm
Cutting	Length control	PLC and Omron encoder, set on touch screen
Cutting	Hydraulic power	4 kW, 12 MPa or above
Control	PLC and cabinet	Panasonic PLC, 700 x 300 x 1000 mm cabinet
Control	Power supply	380 V, 50 Hz, 3 phase

Single Layer, Double Layer or Cassette

South African buyers often ask for a double layer line that runs IBR and corrugated on one frame. That choice saves floor space and one decoiler, and it is why the format sells well there. The trade off is changeover time and a heavier frame. The comparison sits in single layer vs double layer, and the IBR side has its own page on the IBR sheet roll forming machine.

Plants selling into several markets should look at cassette tooling instead. A cassette swap changes the profile on a corrugated sheet roll forming machine in roughly two to three hours without stripping the shaft, which suits a yard that runs corrugated one week and standing seam the next. Our page on the multi profile roll forming line covers the cost comparison.

Speed, Output and Labour

Speed on a corrugated sheet roll forming machine is quoted in metres per minute, but buyers plan in sheets per shift. At 12 m/min with 85 percent uptime, an 8 hour shift runs about 4,900 metres. Cut at 3.6 m, that is roughly 1,360 sheets. The same shift gives about 1,130 sheets at 10 m/min and 1,700 at 15 m/min.

The corrugated sheet roll forming machine itself rarely limits output at these speeds. Coil changes, packing, and crane time usually do. Two operators run a standard line: one at the decoiler and control cabinet, one at the run out table. An automatic stacker removes the second role on long runs and pays back fastest where sheets are cut to a fixed length all day.

Steel and Coating

A corrugated sheet roll forming machine runs coated coil, and that coil lives outdoors for decades, so the coating decision matters more than the frame paint on the machine. Hot dip galvanized coil at Z275 gives 275 g/m2 of zinc across both surfaces and covers most industrial and agricultural work. Aluzinc at AZ150 suits coastal and high humidity sites where zinc alone corrodes too fast. Pre-painted coil with a 25 micron polyester top coat goes on architectural work where colour matters, and it has to form without cracking the paint at the wave crest, which is a roll gap setting rather than a coating spec.

Standards worth quoting in a purchase order include EN 10346 for continuously hot dip coated steel and AS/NZS 2728 for coating selection by environment. The World Steel Association publishes background on coated steel in construction, and the galvanizing body covers coating mass testing at galvanizeit.org. Our wall cladding guide covers how coating choice shifts between roof and wall use.

What Drives the Price

Four things move the number on a corrugated sheet roll forming machine quote, and none of them is the paint colour.

Station count comes first. A 24 station mill handles 18 mm wave depth in mild steel comfortably. Deeper waves or high tensile G550 coil need more stands and larger roll diameters, because each stand has to bend less per pass. Shaft and frame size come second: an 80 mm shaft on an H beam frame covers the standard profile, while 1.6 mm at full width pushes both up a size.

Cutting method comes third. A stop cut hydraulic shear is standard. A flying shear that cuts on the move costs more and earns its money only above roughly 20 m/min, which a corrugated line rarely reaches. Options come last: automatic stacker, embossing rollers, double layer frame, cassette system. Ask for each as a separate line item so the comparison between suppliers stays honest.

How to Specify Your Line

Send these six items and a corrugated sheet roll forming machine builder can quote without a second round of questions.

Profile drawing with pitch, depth, feed width, and cover width
Steel type and thickness range, including the thinnest and thickest coil you will run
Coil size: inner diameter, outer diameter, and maximum coil weight
Required line speed and the sheet lengths you cut most often
Power supply at the destination factory, including voltage and phase
Site conditions: ambient temperature, humidity, and shifts per day

Believe Industry has built custom roll forming lines since 2005, with 15+ years of experience, 80+ engineers, and 500+ projects delivered to 50+ countries under ISO 9001 and CE. We size the frame, rolls, and cutoff to your profile, so the corrugated sheet roll forming machine you get matches the coil you can actually buy.

Send the profile drawing to enquiry@believeindustry.com or use the request a quote form. We reply with a layout drawing, the coil width to cover width conversion for your section, and a price within two working days.

Photo Gallery

Beli RollForming 5 Ton Hydraulic Uncoiler for High-Speed Corrugated Roof Sheet Roll Forming Machine — Our robust 5 Ton Hydraulic Uncoiler provides stable, automated decoiling, ensuring a consistent material flow for heavy-duty metal roof production.

Precision Roll Forming Feeder and Leveling Device by Beli RollForming — This high-precision feeder ensures accurate material alignment and leveling, preventing sheet deformation before it enters the corrugated rolling stations.

Cr12MoV Steel Cutter Blade for Corrugated Roof Sheet Roll Forming Machine — Equipped with a durable Cr12MoV steel cutter blade, our machine provides clean, burr-free hydraulic shearing for perfect sheet length every time.

Automatic Collection Table and Outfeed Rack for Beli RollForming Production Line — The heavy-duty collection table neatly stacks finished corrugated sheets, reducing labor costs and protecting the product surface during discharge.

Fully Automatic Corrugated Roof Sheet Roll Forming Machine Production Line by Beli RollForming — A comprehensive view of the Beli RollForming whole line, integrating advanced PLC controls and high-speed rolling technology for maximum output.

Finished Corrugated Metal Roof Sheet Sample Produced by Beli RollForming Machine — High-quality corrugated roof sheet samples demonstrating the precise profile geometry and flawless finish achieved by our industrial roll forming equipment.

Frequently Asked Questions of Corrugated Sheet Roll Forming Machine

Q: What is the standard size of a corrugated sheet roll forming machine?

A: A 24 station mill with an 80 mm shaft, a 5 kW main motor, and a 5 tonne hydraulic decoiler. It takes 914 mm coil and produces 762 mm cover at 18 mm wave depth, running 10 to 15 m/min.

Q: Can one corrugated sheet roll forming machine run different coil widths?

A: Yes. The roll set fixes pitch and depth, not width. Change from 1250 mm to 914 mm coil and adjust the side guide by hand. The sheet gets narrower and the wave stays the same.

Q: What steel thickness can the line form?

A: 0.4 to 1.6 mm on the standard build of this corrugated sheet roll forming machine. Roofing usually runs 0.5 mm galvanized and wall cladding 0.4 to 0.6 mm. Above 1.2 mm at full width, ask for the heavier frame and larger shaft.

Q: How fast does a corrugated line run?

A: 10 to 15 m/min, which equals roughly 1,130 to 1,700 sheets per 8 hour shift at 3.6 m lengths. Output is usually limited by coil changes and packing, not by the mill.

Q: Does the machine need a mould change for a new profile?

A: Not for a width change, and yes for a new section. Pitch, depth, and wave shape live in the roll set, so a different profile needs new rolls or a cassette. Width alone never does.

Q: Why do South African buyers order double layer lines?

A: One frame runs IBR and corrugated, which saves floor space, one decoiler, and one control cabinet. Yards selling both profiles to the same roofing contractor get more product mix from one investment.

Q: What is the difference between corrugated and IBR sheet?

A: Corrugated is a round sinus wave at 76.2 mm pitch. IBR is a square fluted profile with a trapezoid rib, normally 686 mm or 890 mm cover. Both form from coated coil, but they need different roll sets and guides.

Q: How long is delivery and installation?

A: Standard lines ship in 45 to 60 days after drawing approval, with a few weeks added for cassette tooling or a double layer frame. Installation and training take 7 to 10 days on site with an engineer for commissioning.

Last updated: 2026-11-01

Article Changelog
2026-11-01: Full rewrite of page 680. Replaced 2018 copy, moved the spec block into tables, corrected the thickness range, added coil to cover conversion, output math, coating guidance, FAQ and internal links.

Next Review Triggers
Corrugated profile standard changes in a major export market
Coil price shift above 15 percent
New cassette or double layer tooling released

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