Hebei Xinnuo Fully Automatic 13-Row 840 Trapezoidal Roof Sheet Roll Forming Machine with Double-Rib Design

Overview

The Hebei Xinnuo 840 Trapezoidal Roof Sheet Roll Forming Machine is an industry-standard solution for producing high-quality roofing and wall panels. Specifically engineered with 13 forming stations, this machine ensures that the metal sheet is progressively and gently shaped, minimizing surface stress and preventing paint cracking on color-coated steel (PPGI).

Star Feature: The Double-Rib Performance

Unlike standard 840 machines, this model incorporates a double-rib design between the trapezoidal crests. These stiffening ribs significantly increase the structural rigidity of the final panel, allowing for wider purlin spacing and superior load-bearing capacity under snow or wind loads. It effectively eliminates the "oil-canning" effect (waving) often seen in thinner metal sheets.

Key Technical Advantages

1. 13-Station Precision: More stations mean better stability. Each station is precisely ground and chrome-plated to ensure a consistent profile and a long service life for the rollers.
2. Full Automation: Equipped with a high-end PLC system (Delta/Siemens options), the machine handles the entire process from feeding and forming to length-counting and precision cutting.
3. Advanced Cutting Technology: The hydraulic cutting unit utilizes a Cr12 MoV die steel blade with heat treatment. This ensures a clean, bur-free cut that maintains the integrity of the galvanized coating.
4. Robust Gantry Frame: As seen in the workshop image, the machine features a reinforced steel frame that prevents deformation during high-speed production, ensuring accuracy within ±1.5mm.

Manufacturing Workflow

• Decoiling: Passive or hydraulic release of the steel coil.
• Leveling & Feeding: Ensuring the material enters the rollers perfectly flat.
• Roll Forming: 13 rows of rollers shape the trapezoidal and double-rib profile.
• Hydraulic Cutting: Automatic cut-to-length as per PLC input.
• Product Output: Finished 840 sheets ready for industrial or residential use.

Application Scenarios

The 840 trapezoidal profile is one of the most popular roof designs globally, widely used in:

• Industrial warehouses and steel structure hangars.
• Agricultural buildings and sheds.
• Residential roofing and temporary fencing (hoarding).
• Cold storage wall panels.

Why Partner with Hebei Xinnuo?

As a global leader in roll forming technology, Hebei Xinnuo provides CE-certified machinery with a focus on durability and ease of maintenance. Our 13-row 840 machine is the result of years of R&D, optimized for the high-volume needs of international contractors and distributors.