Overview

An OEM purlin roll forming machine is a specialized industrial equipment system used to continuously mass produce long length metal purlins and girts from coiled steel feedstock for use in original equipment manufactured steel buildings and structures.

Purlins act as structural Z, C or U-shaped roof and wall framing members that support exterior covering materials in metal building systems. Roll formed purlin sections optimize strength-to-weight rations with their vertical web and flange cross-sectional shape.

This guide provides a comprehensive overview of OEM purlin roll former technology, including:

• Machine types and components
• The purlin roll forming process
• Design factors and building standards
• Purlin framing applications
• Cost analysis
• Comparisons with other framing methods
• Leading global manufacturers

Gaining technical insight into OEM purlin roll former capabilities and structural framing assists engineers, contractors and architects evaluating optimized building solutions.

Types of OEM Purlin Roll Forming Machines

There are two primary machine configurations used for high volume OEM purlin production:

Pyramid-Type Purlin Roll Formers

• Typically 10-16 forming stations in decreasing diameter tiers
• Compact layout, smaller footprint
• Slower production speeds

Inline Purlin Roll Formers

• Stations horizontally inline
• Longer line lengths
• High volume capacity
• Faster cycle times

Main Components of a Purlin Roll Former

A typical OEM purlin roll forming line integrates these key sections:

Coil Payoff Reel

• Holds raw steel coil
• Powered unwind

Entry Guides

• Straighten and align strip
• Optimize material feed

Accumulator / Bridle

• Creates back tension zone
• Smooths flow variations

Forming Stations

• Progressive die rollers shape strip
• Number & type determine profile

Cutter

• Pneumatic or servo shear
• Trims finished purlins

Exit Conveyor Table

• Transfers finished lengths
• Supports long products

Automation Controller

• Touchscreen HMI
• Stores recipes
• Production data feedback

How Purlin Roll Forming Machines Work

The OEM purlin roll forming process shapes steel coil strip into C or Z-shaped roof and wall framing sections by bending and forming the feed material incrementally as it passes through a series of roller die stations:

1. Powered coil payoff reel feeds raw coiled steel into entry guides
2. Guides align strip and feed into initial roller stations
3. Rolling dies at each station make gradual precision bends
4. Strip exits each stand slightly more formed
5. Finished purlin profile emerges at end of line
6. Pneumatic shear cuts to length
7. Exit conveyor tables transfer finished lengths

The number of roller die stands determines possible purlin profile complexity. Quick change tooling allows fast production changeovers.

Key Design Factors for Purlin Roll Forming

Equipment specifiers evaluate numerous characteristics when selecting OEM purlin roll formers:

Building Type

• Pre-engineered steel structures
• Agricultural & commercial spans
• Residential metal roofing

Purlin Type

• Zee, Zed, Sigma
• Narrow flange Cee
• Structural tees

Material

• Low carbon steel
• High strength steel
• Galvanized coatings

Thickness

• 16 gauge to 7 gauge
• 1.2mm to 4mm+

Profile Height

• 75mm to 400mm+
• 3” to 18”+

Line Speed

• 10 to 35 m/min
• 33 to 115 ft/min

Changeover

• Quick change tooling
• Secondary fab stations

Framing Standards for OEM Purlins

While often custom engineered for specific buildings, these standards guide commercial purlin designs:

Typical Purlin Framing Applications

Common structural framing applications utilizing OEM roll formed steel purlins include:

Roof Purlins

• Metal building roofing support
• Standing seam roofing
• Single skin systems

Wall Girts

• Exterior metal panel backing
• Curtain wall framing
• Interior divide framing

Platform Framing

• Supporting floors
• Structural bridging
• Platform roofs

Structural Racking

• Warehouse racks
• Mezzanines
• Equipment platforms

Agricultural Buildings

• Pole barns
• Grain bin rings
• Storage sheds

Purlin Specifications

Leading OEM Purlin Roll Former Manufacturers

Top international OEM purlin roll former producers include:

Pricing

Advantages of OEM Purlin Roll Forming

Benefits

• High production speeds
• Precision tolerances
• Quality consistency
• Minimal fabrication
• Lower material cost
• Reduced building construction time

Limitations

• High machine capital costs
• Mainly long, straight shapes
• Can require secondary punching
• Fixed tooling less flexible

FAQ

What is the maximum length of OEM roll formed purlins?

Standard exit conveyor tables allow continuous forming of purlins up to 40′ (12 m). Custom extra long beds can produce sections approaching 65′ (20 m).

What metals can use roll forming for purlins?

All common building steels including low carbon, high strength alloy steels, corrosion resistant alloys as well as lightweight aluminum framing grades.

What if secondary holes or clips are needed in the purlins?

Inline punching presses, drilling machines and clip insertion equipment can be integrated on the exit conveyor to add holes or mounting features.

What is the thickest gauge purlin an OEM roll former can produce?

Average max thickness is around 7 gauge steel or 4mm plate. Heavy duty custom machines can produce structural shapes from 3 gauge steel and beyond.

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