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    Corrugated Roof Sheet Machine: Profiles, Specs and How to Choose One

    Liyang MaSeptember 17, 202644

    Corrugated Roof Sheet Machine: Profiles, Specs and How to Choose One

    A corrugated roof sheet machine is a cold roll forming line that bends galvanized or pre-painted steel coil through successive roller stands into a sinusoidal (round-wave) roof profile, then cuts it to length. Documented ZTRFM corrugated lines cover 0.12–0.8 mm strip, 1000–1250 mm feed widths, 18 forming stands, Ø80 mm shafts and 7.5–11 kW main motors, running at 0–20 m/min or 2–3 seconds per piece.

    Is this page about corrugated profiles only, or roof panels in general?

    This page is corrugated-specific: sinusoidal / round-wave profiles and the machines that make them. If you have not yet chosen a roof family, start with the general roof-panel guide, Roofing Sheet Roll Forming Machine Profiles, which compares corrugated, trapezoidal and IBR, and the Roofing & Wall Panel process library.

    What does a corrugated roof sheet machine actually produce?

    The classic round-wave sheet: smooth crests and troughs, no flat facets. ZTRFM's profile guide lists wave height 15–25 mm and pitch 76–125 mm — 76 mm pitch being the most common in Africa and South Asia — and a typical finished width of about 1000 mm from 1219 mm or 1250 mm coil. The dual-layer process board records sinusoidal corrugated at roughly 760 mm effective width, 76 mm pitch and 18 mm wave height.

    How does a corrugated roll forming line work from coil to sheet?

    The ZT-1220 page publishes five stages: uncoiling → feeding → roll forming → auto cutting → receiving table. Hand wheels set feeding width and stainless rollers guide the strip without scratching the coating; successive stands bend it a few degrees at a time, with 16–22 passes typical; a shear cuts to length. Cutting is either stop-cut (line pauses) or servo tracking cut (shears on the move).

    Single-layer or double-layer corrugated line — which do you need?

    A double-layer (duplex) host carries two profile paths on one frame, commonly corrugated plus trapezoidal, with path select so only the live stands turn.

    Aspect Single-layer corrugated line Double-layer host (corrugated + trapezoidal)
    Corrugated gauge 0.2–0.8 mm; 0.4–0.6 mm on the ZT-1220 0.18–0.40 mm
    Forming 18 stands / 18 rows 20 + 22 passes; Ø75 shafts on the corrugated path
    Documented speed 0–20 m/min 0–15 m/min
    Power 7.5 kW forming + 5.5 kW hydraulic 5.5 kW main + 5.5 kW hydraulic
    Cut Hydraulic shear; shear-with-bend on the arc version Stop-cut, dual guide pillar, Cr12 blades
    Fits best when One corrugated profile, higher speed Two profile families, limited floor space

    Corrugated runs thin (0.18–0.40 mm), trapezoidal thicker (0.35–0.70 mm); the wrong coil on the wrong path bruises tooling.

    Standard in-line vs drum/barrel-type corrugated machine — what is the difference?

    A standard line forms continuous strip through many small roller stands and is rated in metres per minute. A drum or barrel machine forms each piece between large rolls or a mould, so its rate is quoted per piece; the drum/barrel product page notes it exists because very thin sheet cannot be made into roof sheet on a traditional roll forming machine.

    Aspect Standard in-line corrugated line Drum / barrel-type corrugated machine
    Forming method Progressive stands, continuous strip 2 pairs (4 pcs) large rolls, piece by piece
    Rolls Ø80 mm shafts, 18 stands Ø450 mm (product page); Ø500 mm, 6 m long (process board)
    Thickness 0.2–0.8 mm; 0.4–0.6 mm on the ZT-1220 0.12–0.3 mm; 0.13–0.35 mm
    Rate 0–20 m/min; 40 m/min on the high-speed build 2–3 s/piece; 20–60 pcs/min; 10–15 pcs/min
    Motor 7.5 kW or 11 kW 7.5 kW or 5.5 kW; 22 kW × 2 on the process board
    Feeding Automatic from the decoiler Manual feed and manual receive
    Fits best when Coil-to-sheet, variable lengths Very thin sheet, barrels to 6000 mm

    Why does zt-rfm.com quote 12 m/min, 2–3 seconds per piece, 20 m/min and 40 m/min?

    They are four different measurements:

    • 2–3 seconds per piece is cycle time, not line speed. The barrel corrugated machine indexes one sheet at a time, so 2–3 s/piece converts to roughly 20–30 pieces/min, and the page states about 20–60 pieces/min when very thin material lets the machine form three pieces at once.
    • 20 m/min is forming speed on a continuous line; the corrugated/arc process board specifies 0–20 m/min with 18 stands and a 7.5 kW motor.
    • 40 m/min is the high-speed end: the ZT-4948 page states 40 m/min with vertical cast steel stands and gearbox driving, and the site's roofing process article puts typical roofing lines at 15–40 m/min.
    • 12 m/min appears in the ZT-1220 product title while that page's table lists 15 m/min; treat 15 m/min as the tabulated value.

    No 10–12 m/min corrugated forming speed is documented on zt-rfm.com: the 10–12 figure on the site is a forming-stand count. The dual-layer host also runs slower (0–15 m/min) and the barrel host is quoted at 10–15 pcs/min, as heavier configurations trade speed for thickness range.

    What specs should you verify before ordering a corrugated machine?

    Check these against the product page, not the title:

    1. Thickness band — 0.12–0.3, 0.13–0.35, 0.18–0.40, 0.2–0.8 or 0.4–0.6 mm depending on machine.
    2. Feed width, stands and shafts — 1000–1250 mm adjustable across 18 stands with Ø80 mm solid shafts; Ø75 mm shafts on the dual-layer corrugated path; max 1220 mm feed on the ZT-1220.
    3. Roller and shaft material — 45# chromed rollers and 45# heat-treated shafts; 40Cr rollers on the dual-layer board.
    4. Power — 5.5, 7.5 or 11 kW main motor; 5.5 kW hydraulic station on the ZT-1220.
    5. Cut type and blade — GCr12 hydraulic post cutting; Cr12 stop-cut with dual guide pillars; Cr12MoV with PLC-set bend angle for arc panels.
    6. Speed, with its unit — m/min for continuous lines; pieces/min or seconds per piece for barrel machines.
    7. Verification — a 5 t manual decoiler with 450–550 mm coil ID is included with the ZT-1220; pages carry ISO 9001 (certificate No. ZL92090220234630). Ask for a forming run on your drawing at your gauge.

    FAQ

    What thickness can a corrugated roof sheet machine run?
    0.12–0.3 mm on the barrel machine, 0.13–0.35 mm on the drum/barrel unit, 0.18–0.40 mm on the dual-layer corrugated path, 0.2–0.8 mm on the corrugated/arc line and 0.4–0.6 mm on the ZT-1220. Confirm the band against your coil.

    What is the difference between a corrugated and a trapezoidal roof sheet machine?
    Corrugated is sinusoidal — smooth round waves, no sharp angles — while trapezoidal has flat sections between raised ribs. The profile guide gives 10–12 corrugated forming stands versus 14–18 for trapezoidal.

    How fast does a corrugated roof sheet machine run?
    0–20 m/min on the corrugated/arc line and 40 m/min on the ZT-4948 high-speed build. Barrel machines are quoted per piece at 2–3 seconds per piece, about 20–60 pieces/min.

    Do I need a separate decoiler with the machine?
    Usually not. The ZT-1220 includes a 5 t manual decoiler with 450–550 mm coil ID and a 1220 mm maximum feeding width; the dual-layer board specifies a 5 t hydraulic decoiler with coil car.

    What roller and shaft material should I expect?
    45# forged steel rollers with chrome treatment and 45# heat-treated shafts on the ZT-1220; 45# chrome 0.05 rollers on Ø80 mm shafts on the corrugated/arc board; 40Cr rollers on the dual-layer board.

    How is the corrugated sheet cut to length?
    A GCr12 quenched blade with hydraulic post cutting on the ZT-1220; stop-cut with dual guide pillars and Cr12 blades on the dual-layer host; a shear-with-bend and Cr12MoV blades on the corrugated/arc line.

    Where to take this next

    Corrugated is a thin-strip, fast-forming profile family, and figures that look contradictory on spec sheets usually differ only in unit — speed in m/min, cycle time in seconds per piece, throughput in pieces per minute. Pull the profile drawing, gauge band and line speed for the exact machine you are buying. ZTRFM (zt-rfm.com), operated by Zhongtuo Roll Forming (Hebei) Co., Ltd., publishes specs and process boards module by module so corrugated lines can be compared on documented data.

    Sources

    All specifications in this article come from the following zt-rfm.com pages, retrieved during research:

    Conflicts disclosed

    • Line speed on the ZT-1220. The product title states 12 m/min; the specification table on the same page states 15 m/min. Both are given here; treat the table value as the configured figure.
    • Roller diameter on barrel-type machines. The barrel product page states Ø450 mm; the barrel process board states Ø500 mm. These are different SKUs, but the diameter is not interchangeable between them.
    • Barrel machine power. 7.5 kW (barrel corrugated product page), 5.5 kW (drum/barrel product page) and 22 kW × 2 (barrel process board) all appear, describing three different configurations.
    • Corrugated stand count. The general profile guide gives 10–12 stands; ZTRFM's corrugated product page and process board both state 18. The 10–12 figure is a generic baseline; 18 is the documented build.
    • Thickness ranges. Bands of 0.12–0.3, 0.13–0.35, 0.18–0.40, 0.2–0.8, 0.3–0.8 and 0.4–0.6 mm appear across pages because they belong to different machines and target markets. Do not carry a figure from one page to another machine.
    • The "10–12" figure. No 10–12 m/min corrugated speed is documented on zt-rfm.com; 10–12 on the site is a forming-stand count. The nearest real speed figures are 12 m/min (title) / 15 m/min (table) on the ZT-1220 and 0–20 m/min on the corrugated/arc process line.
    • Page-content mismatch. The Corrugated Iron Roof Sheet product page (4951) returned body text about floor decking machines when fetched; only its title-level specs (20 m/min, 11 kW) were usable, so no other figure from that page is cited here.
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