Double Layer Roofing Sheet Roll Forming Machine | Automatic Line

The ZTRFM Double Layer Roofing Sheet Roll Forming Machine is a fully automatic production line designed for manufacturing two different metal roofing profiles on one compact machine. The upper and lower forming layers can be customized for trapezoidal roofing sheets, corrugated sheets, IBR panels or other popular roof and wall cladding profiles according to customer requirements.

By integrating two independent forming systems into one machine frame, the double layer design helps roofing sheet manufacturers expand their product range while reducing workshop space and avoiding the cost of purchasing two completely separate production lines.

It is an ideal solution for building material factories, roofing sheet manufacturers, steel structure companies and distributors that need flexible production for different customer orders.

Two Roofing Profiles in One Production Line

The biggest advantage of the double layer roofing machine is its ability to produce two different profiles with one machine structure.

For example, the upper layer can be designed for trapezoidal roofing panels while the lower layer produces corrugated roofing sheets. Other profile combinations can also be developed according to the customer's local market.

Each layer has its own forming roller system, allowing the required roofing profile to be produced without replacing the complete set of rollers.

When the production order changes, operators can select the corresponding layer and prepare the material for the next product.

This design is especially useful for factories that produce multiple roofing products but have limited workshop space.

Automatic Roofing Sheet Production

The complete working process includes:

Uncoiling → Feeding → Guiding → Roll Forming → Length Measuring → Automatic Cutting → Finished Sheet Receiving

After the steel coil is loaded onto the decoiler, the material is guided into the selected upper or lower forming layer.

The steel sheet then passes through multiple precision forming stations and is gradually shaped into the required roofing profile.

The PLC control system manages production length and quantity automatically. When the finished sheet reaches the preset length, the cutting system completes the cutting cycle and the finished roofing panel is transferred to the receiving section.

This automatic process reduces manual operation and makes batch production easier to manage.

Independent Upper and Lower Forming Systems

Although the two roofing profiles share one machine frame, each layer has an independently designed forming roller system.

Different roofing profiles require different forming sequences because rib height, wave shape, effective width and overlap structure may vary.

ZTRFM designs each layer according to the customer's confirmed finished product drawing.

The independent roller arrangement helps maintain accurate profile dimensions and allows both roofing products to be produced on one compact production line.

Precision Roll Forming Technology

The steel sheet is gradually transformed from flat coil material into the finished roofing profile through multiple forming stations.

Each roller completes part of the deformation instead of forcing the material into its final shape in one step.

This progressive forming method helps improve:

• Profile consistency

• Panel straightness

• Rib and wave accuracy

• Effective width stability

• Side overlap quality

• Finished sheet appearance

The forming rollers are precision machined from high-quality steel and can receive surface treatment to improve wear resistance and long-term durability.

Smooth roller surfaces also help reduce unnecessary friction when processing pre-painted roofing materials.

Strong Double Layer Machine Structure

A double layer machine requires a rigid supporting structure because two complete sets of forming rollers are installed vertically on one frame.

The main machine therefore uses a strong welded steel structure to support the shafts, rollers and transmission components.

Good machine rigidity helps reduce vibration and keeps the forming stations properly aligned during continuous production.

The vertical double layer design also saves considerable floor space compared with installing two independent roll forming machines side by side.

Suitable Roofing Materials

The machine can process materials commonly used for metal roofing production, including:

• PPGI pre-painted galvanized steel

• PPGL pre-painted Galvalume steel

• Galvanized steel

• Aluzinc steel

• Color-coated steel coils

Different materials have different strength and forming characteristics.

Before machine manufacturing, customers can provide their actual raw material information so that the roller design and machine structure can be matched to the intended products.

PLC Automatic Control System

The production line is equipped with a PLC control system and touch-screen operating interface.

Operators can enter the required sheet length and production quantity directly through the control panel.

During production, the system coordinates the forming machine, length measuring device and cutting unit automatically.

The operating language, electrical components and machine voltage can also be customized according to the destination country and factory requirements.

Automatic Cutting System

After the selected roofing profile is completely formed, the sheet enters the automatic cutting section.

The cutting system works together with the PLC and length measuring device. Once the preset length is reached, the machine automatically completes the cutting operation.

Cutting dies are designed according to the corresponding roofing profiles to maintain the finished sheet shape during cutting.

This automatic system helps improve production consistency and reduces manual measuring work.

Wide Range of Roofing Applications

Finished sheets produced by the double layer machine can be widely used for:

• Industrial factories

• Warehouses

• Workshops

• Agricultural buildings

• Commercial buildings

• Residential roofing

• Steel structure projects

• Garages

• Prefabricated buildings

• Exterior wall cladding

Manufacturers can also produce roofing panels in different colors and surface finishes simply by changing the raw material coil.

Space and Investment Saving Solution

For manufacturers requiring two roofing products, purchasing two independent machines usually means additional factory space, electrical systems and equipment investment.

The double layer structure provides a more compact alternative by integrating two forming systems into one production line.

This allows manufacturers to increase product variety while keeping their factory layout more efficient.

Customized Double Layer Solutions

ZTRFM provides OEM and ODM roll forming solutions according to customer requirements.

Customers can send us two finished roofing profile drawings, and our engineering team can evaluate whether the profiles are suitable for a double layer configuration.

Possible combinations include trapezoidal + corrugated sheet, IBR + trapezoidal panel, two different trapezoidal profiles or other customized roofing products.

Optional hydraulic decoilers, coil loading trolleys, receiving tables and automatic stacking systems can also be integrated according to the required automation level.

Factory Testing and Quality Control

Before shipment, the complete double layer production line can be assembled and tested at the factory.

Both upper and lower layers are tested separately to verify material feeding, roller alignment, profile forming, automatic control and cutting performance.

Finished roofing sheets are compared with the confirmed drawings before delivery.

Customers can also provide their own steel coils for testing when required.

After-Sales Technical Support

ZTRFM provides technical support covering machine installation, commissioning, operation and maintenance.

Customers can receive operating instructions, electrical documentation, remote technical guidance and troubleshooting support.

Engineer installation and commissioning services can also be arranged according to project requirements.

With two roofing profiles integrated into one compact production line, the ZTRFM Double Layer Roofing Sheet Roll Forming Machine provides a flexible and cost-effective solution for manufacturers looking to expand their roofing product range.

Keywords:
double layer roofing machine,roof sheet roll forming machine,trapezoidal roofing machine,corrugated sheet machine,metal roof panel machine