C Z Purlin Roll Forming Machine

C  Z Purlin Roll Forming Machine is for producing C and Z Purlins with less change over time.  BELI® new technology design, exchange time is only 2 minutes. Our latest design c and z purlin machine price is only around 35000$ EXW factory. Contact us for more inforamtion.

Believe Industry Company have below machines for different requirements of purlins

All abover machines have various design for specific demands.

What are C Purlin and Z Purlin?

In steel construction, a purlin is a horizontal roof member that spans between main frames or rafters. It carries roof cladding loads and transfers wind and snow loads to the primary structure.

C purlins have a symmetric open channel cross-section — two equal flanges perpendicular to a flat web. Z purlins have one flange angled in the opposite direction, which allows adjacent sections to overlap. Overlapping Z purlins create a semi-continuous beam, increasing load capacity by 30–50% over a simple span at the same steel weight.

The BELI® c z purlin machine produces both profiles from the same set of forming rolls. There is no need for separate machines or separate tooling. This matters when a single project requires both profiles — which is common in large metal building systems.

For applications that also require U-channel profiles, the same line produces U sections without roll changes. Learn more about single-profile production on the dedicated C purlin roll forming machine and Z purlin roll forming machine pages.

Profile Drawings and Dimensions of C and Z Purlin

c purlin
z purlin

Standard purlin dimensions from this line:

  • Web height (H): 80, 100, 120, 150, 200, 250, 300, 350 mm
  • Flange width (B): 50–80 mm typical
  • Lip height (C): 15–25 mm typical
  • Thickness (t): 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, 5.0 mm

Custom dimensions outside this range are possible with adjusted roll design. Submit a drawing via the request a quote page for a feasibility check.

Where C and Z Purlins Are Used

Steel building projects across multiple sectors use purlins produced on this line.

  • Pre-engineered metal buildings (PEB) — roof and wall secondary framing
  • Industrial sheds and warehouses — spans up to 12 m using lapped Z purlins
  • Agricultural buildings — grain stores, equipment sheds
  • Commercial steel buildings — retail, logistics, car parks
  • Modular construction — light steel framing for prefab structures

Steel coil input can be hot-dipped galvanized (GI), pre-painted (PPGI), or bare structural steel. Galvanized coil is common for roofing applications where corrosion resistance matters.

For complete steel building system context, visit the construction and steel structure page. For related secondary framing machines, see the multibeam roll forming machine which handles multiple purlin profiles on one tool set.

Industry Standards and References

C and Z purlins are governed by international structural standards. Before specifying a purlin size, confirm compliance with the applicable code for your region.

These codes define allowable span tables, deflection limits, connection requirements, and corrosion protection standards. The BELI® machine is calibrated to produce profiles that meet dimensional tolerances required by these specifications.

For a broader overview of machine selection criteria, the article How to Pick the Right Roll Forming Corporation covers supplier qualification, machine inspection, and what to verify before payment.

C, Z, and Sigma Purlin: Side-by-Side Comparison

Buyers frequently ask how C, Z, and Sigma purlins differ. The table below covers cross-section geometry, structural behavior, production method, and typical use cases.

Feature C Purlin Z Purlin Sigma (Ω) Purlin
Cross-section shape Symmetric open channel Asymmetric channel with slanted flange Closed omega / hat profile
Lapping capability Not suitable for lapping Designed for sleeve/lap connections Not typically lapped
Span performance Single span (simple beam) Continuous span (lapped = +30–50% capacity) Single or continuous
Stiffness-to-weight Standard Standard to moderate High (closed web stiffens section)
Typical web height 100–350 mm 100–350 mm 150–450 mm
Material thickness 1.5–5.0 mm 1.5–5.0 mm 1.5–5.0 mm
Production method Roll forming (C Z machine) Roll forming (C Z machine) Dedicated Sigma roll forming tooling
Steel grade S235–S550 S235–S550 S235–S390
Primary application Walls, light roof spans Roof purlins, continuous spans >6 m European portal frame purlins
Producible on BELI® CZ machine? Yes Yes No — separate tooling required

The BELI® unit is designed specifically for C and Z production. If Sigma profiles are required, Believe Industry offers a separate customized profile solution — see the customized profile roll forming machine page.

Purlin Loading Capacity Reference and Quick Calculator

Quick Reference

The table below shows indicative load capacity values for standard C and Z purlin sizes. Values assume simple span conditions. Lapped Z purlin systems carry 30–50% more load.

Profile Height × Thickness Steel Grade Span 6 m load (kN/m) Span 8 m load (kN/m)
C200 200 × 2.0 mm Q345 4.2 2.4
Z200 200 × 2.0 mm Q345 4.8 (lapped: 7.0) 2.7 (lapped: 4.0)
C250 250 × 2.5 mm Q345 6.8 3.8
Z250 250 × 2.5 mm Q345 7.5 (lapped: 11.0) 4.2 (lapped: 6.2)
Z300 300 × 3.0 mm S550 14.0 (lapped: 20.0) 7.9 (lapped: 11.5)

For deflection-governed spans (typically >6 m), the limiting factor is stiffness, not yield strength. Switching from Q345 to S550 steel does not significantly increase load capacity when deflection controls.

Use the site’s metal coil calculator to estimate coil weight, strip length, and material yield for your purlin production run.

Key Considerations for this Calculator:

  1. Governing Factor: The calculator automatically compares strength versus stiffness. Usually, for longer spans (e.g., > 6m), deflection (sagging) is the limiting factor rather than the steel actually breaking.

  2. Section Properties: The tool uses simplified Moment of Inertia (I) and Section Modulus (S) values for common C/Z sizes. For a professional website, these values can be updated to match your specific roll-formed profile geometry.

  3. Units:

    • Span: Input in meters.

    • Load Output: kN/m (kiloNewtons per linear meter). To convert to kg/m, multiply the result by approximately 101.97.

  4. Assumptions: This model assumes a “Simple Span” (purlin supported at both ends but not continuous). For Z-purlins that are lapped, the load capacity can increase by up to 30-50% due to continuity over the rafters.

Purlin Loading Capacity Calculator

SAFE LOAD 0.00 kN / m
CAPACITY 0 kg / m

Changeover Solution for C Purlin and Z Purlin

The duplex roll mill design is the core innovation. Two separate roll forming units work in sequence on the same line.

The first mill controls flange length “L.” The second mill controls web height “H.” Each adjusts independently via 0.75 kW servo motors.

To switch between C and Z profile, one edge of the section is deflected up (C purlin) or down (Z purlin) by rotating the relevant forming stand 180° around its shaft. This takes about 60 seconds with the provided torque wrench.

Key fact: BELI® machines can produce 80–350 mm web height and handle strip widths up to 600 mm — all on the same tooling without roll change. This covers the full range of standard purlin sizes used in single-story industrial buildings.

For production runs that require lip height variation, this can be achieved by adjusting the incoming strip width or adding a third duplex mill. The C purlin roll forming machine page covers the specific adjustment sequence for single-profile production.

Punch Holes Solution for C Z Purlin Roll Forming Machine

Three punching configurations are available. The right choice depends on hole pattern complexity and production volume.

Punching Method When to Use Advantages
Independent Servo Pre-Punch High-volume runs, complex hole patterns Fastest cycle — punches before forming, no line slowdown
Pre-Cut Integrated Punch Simple flange holes, cost-sensitive projects Lower investment, compact footprint
Post-Punch Device Frequent size changes, mixed C/Z runs Maximum flexibility — punch after forming, change patterns easily

The hydraulic punching unit uses CR12 MoV dies hardened to HRC 58–62°. Working pressure: 12–16 MPa. The gantry-style frame allows quick die position adjustment across the purlin web and flanges.

Hole position data is stored in the PLC and linked to the product recipe. Call up a stored job and the punch coordinates reload automatically.

How to adjust the machine for switching between C purlin and Z purlin production

Another quick-change “C” and “Z” purlin mill is forming one edge of the product up. At the other edge no need adjust, the top and bottom rolls can be easily exchanged by either rotating each stand 180º around a shaft or deflecting one leg up for the C Purlin or down for the Z Purlin . These designs enable the production of “C” and “Z” Purlins on the same machine without tool change.

Machine Layout and Production Sequence

The standard production line follows this sequence:

  1. 5-Ton Hydraulic Uncoiler — electric motorized, hydraulic mandrel expansion
  2. Servo Feeder & Guiding Device — ensures strip entry alignment
  3. Leveling Unit — 7-roller leveling (3 top, 4 bottom), 90 mm chrome-coated rollers
  4. Pre-Punch or Post-Punch Device — gantry-style hydraulic press
  5. 18-Station Roll Forming Unit — duplex mill design for C/Z switching
  6. Servo-Driven Flying Cutter — multifunctional hydraulic cut-off, no die change for C/Z
  7. Auto Stacker (optional)

The forming speed is 15 m/min. Line power consumption is approximately 60 kW at full production. The control cabinet runs on 380V / 50Hz / 3-phase with a MCGS touchscreen for job parameter storage. Different product dimensions can be saved and recalled instantly — no re-entry of parameters between jobs.

Compare this layout to lighter-duty options on the multibeam roll forming machine page, which handles up to 8 section types from a single roll set.

layout of c z purlin roll former
Uncoiling-- Feeding and Guiding-- Leveling-- Roll Forming-- Straightening-- Punching Holes-- Cutting-- Auto Stacking

Technical Parameters of C&Z Purlin Roll Forming Machine

Component Specification
Uncoiler capacity 5 ton / hydraulic mandrel / 480–620 mm ID / max OD 1600 mm
Strip width range 150–600 mm
Material thickness 1.5–5.0 mm
Supported steel grades Q235, Q345, S550, GI, PPGI
Forming speed 15 m/min
Number of forming stations 18 stations
Roll shaft material ASTM 1045, Ø90 mm, HRC 58–62°
Roll material CR12MoV, HRC 58–62°, chrome-plated surface
Main drive motor 37 kW gear box transmission
Flange adjustment motor 0.75 kW × 2
Web adjustment motor 1.5 kW
Hydraulic punch motor 7.5 kW / 12–16 MPa
Hydraulic cutter motor 7.5 kW / 12–16 MPa
PLC brand Panasonic
VFD brand Yaskawa
Encoder brand Omron
HMI MCGS touchscreen
Power supply 380V / 50Hz / 3-phase

For applications requiring higher steel grades or wider strip, contact Believe Industry for a custom engineering proposal. The customized profile roll forming machine page covers non-standard profile requests.

Photo

Why Buyers Choose Believe Industry

Believe Industry (BELI®) has supplied c z purlin machines to customers in over 40 countries. Key differentiators that come up in buyer feedback:

  • 2-minute changeover — verified in customer installation videos, not just a spec sheet claim
  • Named-brand components — Panasonic, Yaskawa, Omron are globally serviceable without factory intervention
  • English documentation — full manual, electrical drawings, and operator guide in English
  • Direct factory pricing — no distributors, no markup layers
  • Pre-shipment testing — every machine runs trial production before crating

The factory is located in Wuxi, Jiangsu — one of China’s main metal forming equipment manufacturing regions. Delivery to a main port (Shanghai, Ningbo) is included in the EXW price on request.

For buyers who need to compare this against a broader range of roll forming machines, the product catalog covers roofing sheet, wall panel, deck, racking, and gutter forming lines.

C Z Purlin Roll Forming Machine in Action

Related Machines in the Purlin Family

The BELI® purlin product range includes several related lines.

Machine Profiles Produced Best For
C Purlin Roll Forming Machine C channel only Single-profile high-volume production
Z Purlin Roll Forming Machine Z channel only Single-profile production, lapped span systems
C Z Purlin Roll Forming Machine (this page) C, Z, U on one machine Mixed profile production, job shops
Multibeam Roll Forming Machine Up to 8 sections per tool set Maximum profile flexibility per investment
Light Gauge Steel Frame Machine LGSF studs, tracks, C-sections Prefab residential and modular construction

For buyers also evaluating storage systems, the pallet racking roll forming machine and upright rack roll forming machine pages cover structural profiles for warehouse storage systems.

Maintenance and Operating Tips

A well-maintained unit runs reliably for 10+ years. The biggest causes of premature wear are poor lubrication and running abrasive material through unserviced forming rolls.

  • Lubrication: Apply roll forming oil to the strip entry daily during production. Check gearbox oil level weekly.
  • Roll inspection: Inspect forming rolls for surface scoring every 500 production hours. Chrome-plated rolls have a longer service life but will show wear at edges first.
  • Punch die clearance: Verify punch-to-die clearance matches material thickness. Worn clearance causes burrs and shortens die life.
  • PLC backup: Save the job parameter file after any dimension change. PLC battery backup typically holds data for 2 years.
  • Hydraulic system: Replace hydraulic oil every 2,000 hours. Check filter condition monthly.

Full maintenance procedures are covered in the metal roll forming machine maintenance guide.

Related Reading

These articles provide additional context for buyers evaluating a c z purlin machine purchase.

Request a Quote for the C Z Purlin Roll Forming Machine

The BELI® line covers the full practical range of structural purlin production — C, Z, and U profiles from a single line, with sub-2-minute changeover and branded control components.

Pricing starts at $35,000 USD EXW for a standard configuration. Custom size ranges, higher-capacity uncoilers, automatic stackers, and servo pre-punch units are available.

To get a quote tailored to your required profile sizes, material thickness, and production volume:

  • Submit a request a quote with your purlin dimension list
  • Contact via WhatsApp: +86 186 1692 7760
  • Email: enquiry@believeindustry.com
  • Read the FAQ page for common pre-purchase questions

Believe Industry Company | No. 1, Yd Road, Huishan District, Wuxi City, Jiangsu 214183, China

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