Automatic C-Z Purlin Roll Forming Machine Complete Guide
Here at ZHENG LIMING MACHINERY, we are a seasoned Chinese manufacturer that specializes in full-set cold-roll-forming equipment for metal sheets. Our premium-grade purlin roll-forming machines serve global steel-construction clients with reliable, fully-automated production lines, ideal for warehouse, metal building and photovoltaic support purlin production.
What Is a Purlin Roll - Forming Machine
In steel-structure buildings, purlins act as critical roof framing members running parallel to roof eaves for supporting metal roof panels.
A purlin roll-forming machine fabricates steel purlins with varied cross-section profiles. During the roll-forming workflow, raw metal strips go through multiple groups of forming rollers and get shaped into continuous finished profiles.
Our ZHENG LIMING multi functional purlin equipment manufactures C-shaped, Z-shaped, U-shaped and Sigma steel sections. Multiple configurable sizes and high-accuracy punching units are supported, meeting diversified requirements from modern structural-steel construction projects.
Types of Purlin Profiles: C, Z, U, and Sigma
In the steel industry, specific nomenclature is assigned to structural shapes to simplify drawings and engineering documentation:
| Profile Type | Cross-Section | Primary Application | Key Feature |
| C Purlin | Channel shape with stiffened flanges | Wall framing, floor joists, light structural framing | Flange stiffeners increase load capacity |
| Z Purlin | Z-shape with overlapping ends | Roof framing, continuous span applications | Overlapping design enables continuous load transfer |
| U Purlin | Simple channel without stiffeners | Light structural support, bracing members | Economical for lighter loads |
| Sigma Purlin | Custom-engineered profile | Specialized structural requirements | Tailored to specific project needs |
Core Benefits of Our Purlin Forming Machine
Efficiency–Maximize Your Production Output
- Full-automatic operation and fast-profile-switch design cut down manual-adjustment downtime. Lower manufacturing costs help you stay competitive within your local market.
- Non-stop continuous production: The roll-forming line supports endless-length profile fabrication, enabling non-stop production and on-time project delivery.
Quality – Precision Engineering for Consistent Results
- Stable and consistent profile quality: Precision machining and steady-running forming assemblies guarantee uniform finished-section dimensions and reliable long-term product quality.
- High-precision machining and custom-made punching: Every finished steel purlin keeps tight dimensional tolerance. Multiple hole patterns are available for customization, including flange holes, bottom holes and plum-blossom holes.
Cost Savings–Reduce Labor and Material Waste
- Reduced labour expense and human-made errors: Automated workflows minimize manual participation. Human-caused mistakes are greatly reduced while overall throughput gets improved.
- Less raw-material waste: Equipped with hydraulic front shears and guillotine-type cutting heads, the equipment trims sheet-metal ends neatly and reduces leftover scrap material. Rear cutting units deliver clean, burr-free finished profiles.
Flexibility–Adapt to Any Project Requirement
- Stepless automatic size adjustment for C, Z profiles: Our intelligent control system enables seamless switching between C-type and Z-type purlins without manual disassembly and roller replacement. Fast parameter adjustment adapts the machine for varied production orders.
- Customization service: We provide tailored roll-forming solutions for varied profile widths, punching layouts and cutting configurations.
Automatic-Change-Over VS Manual-Adjust Purlin Machine
Both machine versions process C-section, Z-section and U-section purlins within the size range 100–300 mm.
| Comparison | Manual Type-Change | Automatic Type-Change | Advantage |
| Changeover Method | Workers manually replace bushings when switching profiles | PLC controlled one-touch profile change, no manual bushing replacement | ✅ Automatic |
| Changeover Time | 20-40 minutes | 3-5 minutes | ✅ Automatic |
| Applicable Sizes | C100-C300, Z100-300, U100-300 | C100-C300, Z100-300, U100-300 | -- |
| Best For | Fixed specifications, high-volume mass production | Multi-profile, small-batch, frequent changeover production | ✅ Automatic |
| Equipment Cost | Lower (economical option) | Higher (better ROI for flexible production) | ✅ Manual |
| Labor Dependency | Requires skilled operators for changeover | Minimal human intervention — PLC controls everything | ✅ Automatic |
| Precision Consistency | Dependent on operator skill level | PLC controlled, consistent precision every time | ✅ Automatic |
| Punching Capability | Flange holes, plum blossom holes, and various patterns | Flange holes, plum blossom holes, and various patterns | -- |
| Tooling Equipment | Can be equipped with follow-on shears, universal shears | Can be equipped with follow-on shears, universal shears | -- |
| Recommended For | Customers with large-volume, fixed-specification production | Customers with diverse orders and high flexibility requirements | ✅ Automatic |
Key Insight: While manual type-change machines are more economical upfront, the automatic type-change machine pays for itself within 12-18 months through reduced downtime, lower labor costs, and the ability to accept more diverse customer orders.
Key Technical Specifications
| Parameter | Specification |
| Material Thickness | 1.5–3.0 mm |
| C Purlin Web Width | C80–300 mm |
| C Purlin Flange Height | 40–100 mm |
| Z Purlin Web Width | 120–300 mm |
| Z Purlin Flange Height | 50–100 mm |
| Production Speed | 8–25 m/min |
| Roller Material | GCr15 bearing steel, hard chrome plated |
| Roller Hardness | HRC 58-62 |
| Control System | Siemens PLC with touch screen |
| Profile Types | C, Z, U, Sigma (interchangeable) |
| Changeover Type | Automatic / Manual optional |
| Punching Capacity | Bottom holes, flange holes, plum blossom holes, custom patterns |
| Cutting System | Hydraulic shear (flying shear optional) |
| Optional Equipment | Follow-on shears, universal shears, stacker |
Key Machine Features
- Full-auto workflow from metal-coil feeding up to finished purlin output, cutting down manual operations and boosting running stability.
- PLC-powered stepless profile switching between C-type and Z-type sections.
- One-touch fast parameter adjustment to accommodate custom-sized profiles.
- High-precision forming units for stable, uniform finished steel dimensions.
Frequently Asked Questions About Purlin Machine
Q1: What is the difference between C purlin and Z purlin?
A1: C purlins feature a simple C-shaped cross-section with stiffened flanges
— commonly used for wall framing, floor joists, and light structural applications. Z purlins have a Z-shaped cross-section with overlapping ends
— ideal for roof framing as the overlapping design enables continuous load transfer across multiple spans.
Quick guide: Choose C purlin for wall framing and single-span applications; choose Z purlin for roof framing and multi-span continuous structures.
Q2: Can your purlin machine switch between C and Z profiles automatically?
A2: Yes, Our automatic size-changing purlin machine switches between C, Z, U, and sigma profiles via PLC one-click parameter setup — no manual bushing replacement or roller changes required. Changeover takes only 3-5 minutes.
Q3: What materials can your purlin machine process?
A3: Our purlin roll forming machine processes galvanized steel, cold-rolled steel, hot-rolled steel, and high-strength low-alloy steel (HSLA). The standard thickness range is 1.5-3.0mm, with customized configurations available for thicker materials upon request. Send us your drawings or technical specifications for a free feasibility assessment.
Q4: What after-sales support does Zheng Liming provide for overseas customers?
A4: We provide overseas engineer on-site installation guidance, operator training at your facility, 12-month warranty on core components, remote video call technical support, and lifelong technical consultation — ensuring your production runs smoothly from day one.
Q5: What is the price of a purlin roll forming machine?
A5: Pricing depends on configuration (manual vs automatic changeover, punching options, material thickness capacity, and optional equipment like stackers or flying shears). Contact us with your specific requirements and production volume — we will provide a factory direct quotation tailored to your project.
Q6: What is your typical lead-time for purlin roll forming machine?
A6: Standard models take 45-60 working days. Custom-built lines require 60-90 working days. Contact us to get an exact schedule for your order.
Get Your Free Purlin Machine Quotation
If you are looking for a durable, high-speed purlin roll forming machine with automatic size change capability, contact Zheng Liming Machinery today.
Get free technical drawings and factory price quotation
Global service coverage: 96 countries | 500+ projects | 140+ patents | Since 1989
Zheng Liming Machinery has been a trusted purlin roll forming machine manufacturer since 1989. Our C/Z/U profile roll forming equipment is used by steel structure manufacturers worldwide for automated, high-precision purlin production.
