Greenhouse Profile Roll Forming Machine

Short answer: A greenhouse profile roll forming machine turns galvanized steel coil into the frame sections of a greenhouse: gutters, glazing bars, crop rails, clip rails and arches. Most lines run 1.2 to 3.0 mm coil at 8 to 20 m/min, with 12 to 24 forming stations, inline punching and a cut-off that follows the strip.

Which sections hold a greenhouse together?

A greenhouse is not one profile repeated four hundred times. Four to eight sections lock together into a frame that carries glazing, wind, snow and the weight of a crop. Each section has its own coil width, its own steel thickness and its own set of bends, and one greenhouse profile roll forming machine has to cover all of them.

That is why buyers should read the profile drawing before the machine tonnage. The drawing below is a set we built for a grower: four sections, four coil widths, one line.

Read the coil widths first. The 78 x 40 gutter takes 156 mm strip. The 32 x 25 hat section that clips into the gutter mouth takes 124 mm. The wavy rail takes 117 mm, and the small clip rail only 62 mm. One decoiler has to cover 62 to 156 mm without a rebuild.

Section	Section size	Coil width	Thickness	Job in the frame
Gutter	78 x 40 mm	156 mm	2.0 to 2.5 mm	Eave line, roof water and truss reaction
Hat section	32 x 25 mm	124 mm	1.5 to 2.0 mm	Glazing bar, clips into the gutter mouth
Wavy rail	56 x 30 mm	117 mm	1.5 to 2.0 mm	Crop support, bench edge, trellis wire
Clip rail	30 x 11 mm	62 mm	1.2 to 1.5 mm	Spring clips and film fixing
Arch or bow	Project specific	100 to 190 mm	2.0 to 3.0 mm	Span, wind load and snow load

On any greenhouse profile roll forming machine the gutter decides the frame. It carries roof water and truss reaction at the same time, which is why the same drawing usually runs 2.0 to 2.5 mm rather than 1.5 mm. A thin gutter dents at the bracket hole long before the frame itself fails.

What runs on the line?

A greenhouse profile roll forming machine is short compared with a cable tray or racking line. Most installations measure 18 to 25 m from decoiler to run-out table, and they run one shift a day rather than three.

• Decoiler: 3 to 5 t single arm, manual or hydraulic expansion, 508 mm coil ID.
• Leveler: seven or nine rolls, removes coil set before the first pass.
• Servo feeder and press: 60 to 100 t, SKD 11 tooling, feeds to ±0.5 mm.
• Roll former: 12 to 24 stands on a welded frame, chain and gearbox drive.
• Cut-off: hydraulic flying shear for thin sections, stop-and-cut for heavy gutters.
• Run-out table: 6 m or 12 m, with a stacker for high volume work.
• Control: PLC and HMI, batch counter, fault log.

Stations are where the money sits on a greenhouse profile roll forming machine. Every extra stand adds a pair of shafts, four bearing blocks, a gear pair and a slice of motor load. It also removes one springback problem that operators would otherwise fight with shims.

Section	Forming stations	Line speed	Cut-off type
Gutter 78 x 40	16 to 20	8 to 12 m/min	Hydraulic flying shear
Hat section 32 x 25	14 to 18	10 to 15 m/min	Flying shear
Wavy rail 56 x 30	12 to 16	12 to 18 m/min	Flying shear
Clip rail 30 x 11	10 to 14	15 to 20 m/min	Flying shear
Arch or bow	18 to 24	8 to 12 m/min	Saw or flying shear

Thin clip rails run fast on few stands of the same greenhouse profile roll forming machine. Structural gutters run slower on more stands, because the lip, the stiffening rib and the two return flanges each need their own pass.

Which specifications decide the price?

Two greenhouse profile roll forming machine lines can share a 15 kW motor and a 60 t press and still differ by 30 percent in price. Shaft diameter, frame rigidity, bearing class and the way the cut-off travels are the difference.

Parameter	Range	Why it matters
Coil width	60 to 200 mm	Must cover the widest section plus edge trim
Strip thickness	1.2 to 3.0 mm	Sets roll gap and press tonnage
Yield strength	235 to 550 MPa	Higher yield means more springback and more stations
Coil weight	3 to 5 t	Longer runs between coil changes
Main motor	7.5 to 15 kW	Thicker gutter sections need the top of the range
Shaft diameter	60 to 80 mm	Deflection under load, gauge holding on 2.5 mm
Section tolerance	±0.5 mm	Decides whether glazing bars clip in by hand
Straightness	1 mm per metre	Long gutters must sit flat on the columns
Cut length tolerance	±2 mm	Bolt holes line up on site

The tolerance rows are the ones buyers skip on a greenhouse profile roll forming machine. A 0.5 mm error on a 32 mm hat section is 1.5 percent of the section, enough to make a glazing bar tight on one side of the house and loose on the other.

Galvanized coil: the part buyers underestimate

Greenhouse interiors are wet. Condensation runs down the glazing every morning, and irrigation water carries fertilizer. Zinc is the only thing standing between the frame and red rust, so coating weight matters more than steel grade on a greenhouse profile roll forming machine.

Z275 gives 275 g/m² of zinc across both surfaces, roughly 20 µm per side. Z350 gives about 25 µm. In a ventilated greenhouse both last, but coastal sites and heavy fertigation move the spec to Z350 without much argument. The American Galvanizers Association publishes the coating thickness to service life figures behind that choice.

Cut edges and punched holes carry no coating at all. That is why bracket holes should be punched with a clean die and why the cut-off should not drag the strip. A torn edge rusts first, and it rusts inside the section where nobody looks until the gutter leaks. SteelConstruction.info covers the same failure mode on structural steelwork.

If the coil arrives with an unknown coating weight, read how to select steel coil for roll forming before the rolls are cut. Roll passes are built around one thickness and one yield strength, not around whatever the mill has in stock.

One mill, more than one section

Most growers do not buy a greenhouse profile roll forming machine per section. They buy one line and a set of cassettes, then change over when the order book changes.

A cassette change is a roll pack swap, not a rebuild. Four sections on one greenhouse profile roll forming machine, changed in 2 to 3 hours each by two people, is normal. That is the difference between quoting a 400 m greenhouse in a week and turning it down.

The trade-off sits in the frame. A cassette mill is heavier and more expensive than a fixed mill built for one section. If you will only ever make one gutter, buy the fixed mill. If you sell frames to more than one grower, buy the quick change roll forming machine and keep the cassettes on a rack.

Rolling on site instead of shipping air

A 6 m gutter off a greenhouse profile roll forming machine is mostly air. Shipping it in a 40 ft container costs more than the steel inside it, and it arrives with dents at every handling point.

Portable units solve that for projects far from a factory. The greenhouse profile roll forming machine below travels on crawler tracks, carries its own decoiler and control cabinet, and rolls at the greenhouse pad. Sections come off the line and go straight onto the columns.

A portable greenhouse profile roll forming machine costs more than a fixed line and runs slower. For one greenhouse it is a luxury. For a 20 hectare project on another continent it is often the cheapest option on the table.

How to specify your machine

Five answers close most of the specification for a greenhouse profile roll forming machine. Send them together and the quote stops being a guess:

1. The section drawing, with coil width and thickness. A photo of an existing gutter is second best.
2. The steel grade: Q235B, Q345B, S280GD or S350GD. Yield strength drives springback and roll design.
3. The coating: Z275 or Z350, and whether the profile is powder coated after forming.
4. The hole pattern: bracket holes, drainage slots, bolt holes. Inline punching beats drilling later.
5. How many sections you expect to run in five years. That single answer decides fixed or cassette.

Believe Industry has built greenhouse profile roll forming machine lines since 2005, with 80+ engineers and technicians, 500+ machines running in 50+ countries under ISO 9001 and CE. Beyond greenhouse sections we build customized profile roll forming machines for racking, door frames, solar and cable tray work, and the wider range is listed under customized profiles.

For growers who run gutters as a crop system rather than a roof part, the cultivation gutter system and the hydroponic hanging gutter roll former cover the same line in more detail. If the greenhouse sits on a farm that also forms cladding or purlins, start from agricultural roll forming machines and compare line layouts.

Frequently Asked Questions of greenhouse profile roll forming machine

Q: What steel thickness do greenhouse profiles use?
A: Gutter sections usually run 2.0 to 2.5 mm, glazing bars and crop rails 1.5 to 2.0 mm, and clip rails 1.2 to 1.5 mm. Arches go to 3.0 mm when the snow load is high.

Q: How fast does the machine run?
A: 8 to 20 m/min depending on the section. A clip rail runs at the top of that range, a 78 x 40 gutter at the bottom, so one 6 m gutter takes roughly 30 to 45 seconds.

Q: Can one greenhouse profile roll forming machine make several sections?
A: Yes, with cassettes. A roll pack swap takes 2 to 3 hours with two people, and the same line can then run a gutter, a hat section or a crop rail.

Q: Which zinc coating should I order?
A: Z275 is the default for inland greenhouses. Move to Z350 for coastal sites, heavy fertigation or a frame that will never be repainted.

Q: What tolerance can the line hold?
A: ±0.5 mm on the section, 1 mm per metre on straightness and ±2 mm on cut length. Tighter than that needs a different roll design, not a different operator.

Q: Do I need inline punching?
A: For gutters, yes. Bracket holes, drainage slots and bolt holes punched on the line remove a second operation and keep hole spacing tied to the cut length.

Send a section drawing to our engineering team and we will size a greenhouse profile roll forming machine around it, with the station count, the coil width and a line layout instead of a catalogue page.

Last updated: 2026-11-05
Article Changelog
2026-11-05: Rebuilt the page from 262 to 1,800 words, added the profile, station and specification tables, six FAQs and eight internal links.
Next Review Triggers
A new greenhouse section drawing is added to the range
Zinc coating or steel grade recommendations change
The cassette or portable line is replaced by a new model