Single Head vs Double Head Uncoilers – Full Roll Forming Comparison Guide

Single Head Uncoilers vs Double Head Uncoilers

1. Overview of Both Systems

What is a Single Head Uncoiler?

A single head uncoiler (single mandrel decoiler) is a coil handling system with one mandrel, holding one coil at a time.

One coil loaded at a time
Simple design
Coil must be replaced when finished
Production stops during changeover

Typical use:

Standard roll forming lines
Low to medium production
Cost-sensitive setups

What is a Double Head Uncoiler?

A double head uncoiler (double mandrel decoiler) has two mandrels mounted on a rotating frame, allowing one coil to run while the other is prepared.

Two coils loaded simultaneously
Quick rotation between coils
Minimised downtime
Continuous production capability

Typical use:

High-speed roll forming lines
Continuous production environments
Large-scale manufacturing

Key Difference

Single head = one coil, more downtime
Double head = continuous operation, minimal downtime

2. Engineering & Design

Single Head Uncoiler

One mandrel shaft
Coil expanded mechanically or hydraulically
Rotation driven by pull or motor
Requires manual or semi-automatic loading

Double Head Uncoiler

Two mandrels on a rotating base
Hydraulic or motorised rotation system
Allows quick switching between coils
Can include braking and tension control systems

Key Insight

Double head systems are designed to eliminate coil changeover delays.

3. Cost Comparison (Side-by-Side)

Initial Cost

Single Head → $2,000 – $15,000
Double Head → $10,000 – $60,000+

Installation Cost

Single → Low
Double → Medium

Labour Cost

Single → Higher
Double → Lower

Cost per Ton Processed

Single → Higher
Double → Lower

Key Insight

Double head uncoilers cost more upfront but significantly reduce production downtime costs.

4. Production Efficiency & Downtime

Single Head Uncoiler

Production stops for coil change
Changeover time: 10–30+ minutes
Interrupts workflow

Double Head Uncoiler

Continuous operation
Coil prepared while running
Changeover in seconds (rotation)

Conclusion

Double head systems dramatically improve production efficiency and uptime.

5. Production Speed Compatibility

Single Head

Suitable for low to medium speed lines
Struggles with high-speed continuous production

Double Head

Designed for high-speed lines (20–100+ m/min)
Supports continuous feeding

Key Insight

High-speed lines benefit significantly from double head systems.

6. Automation & Integration

Single Head Uncoiler

Limited automation
Often standalone
Basic integration

Double Head Uncoiler

Fully integrated with PLC systems
Can synchronise with:
- Coil car systems
- Servo feeders
- Loop control

Conclusion

Double head uncoilers are better suited for automated production lines.

7. Coil Handling & Capacity

Single Head

Handles one coil at a time
Simpler loading
Lower handling efficiency

Double Head

Handles two coils
Continuous supply capability
Better material flow management

Key Insight

Double head systems improve material handling efficiency.

8. Safety Comparison

Single Head

More operator involvement
Manual coil change risks
Limited safety features

Double Head

Reduced operator interaction
Safer coil handling
Controlled rotation systems

Conclusion

Double head uncoilers offer improved safety, especially in high-volume environments.

9. Maintenance & Complexity

Single Head

Simple design
Low maintenance
Easy repairs

Double Head

More complex system
Additional moving parts
Requires regular maintenance

Key Insight

Single head = simple and low maintenance
Double head = complex but high performance

10. Typical Applications

Single Head Uncoilers

Roofing panel machines
Trim and flashing lines
Small fabrication shops

Double Head Uncoilers

High-speed roofing lines
Structural roll forming
Automotive and industrial production

11. Advantages and Disadvantages

Single Head Uncoilers

Advantages

Low cost
Simple operation
Easy maintenance
Compact design

Disadvantages

Production downtime
Lower efficiency
Higher labour requirement
Limited scalability

Double Head Uncoilers

Advantages

Continuous production
Reduced downtime
Higher efficiency
Better automation integration
Improved safety

Disadvantages

Higher cost
Larger footprint
More complex system
Higher maintenance requirements

12. When to Choose Each Option

Choose Single Head When:

Production volume is low
Budget is limited
Simplicity is required
Downtime is not critical

Example: Small roofing or trim production

Choose Double Head When:

Running high-volume production
Downtime must be minimised
You want continuous operation
Labour efficiency is important

Example: Industrial roll forming line

13. Real Production Scenarios

Scenario 1: Small Workshop

Choice: Single head
Reason: Low cost and simple operation

Scenario 2: Growing Manufacturer

Choice: Double head upgrade
Reason: Reduce downtime and increase output

Scenario 3: High-Speed Factory

Choice: Double head with coil car
Reason: Continuous, automated production

14. Final Comparison Summary

Single Head Uncoilers = Low cost, simple, downtime required
Double Head Uncoilers = High efficiency, continuous production, higher cost

15. FAQ

What is the main advantage of a double head uncoiler?

It allows continuous production by eliminating coil changeover downtime.

Are double head uncoilers worth the cost?

Yes, especially for high-volume and high-speed production.

Can a single head uncoiler be upgraded?

Usually not directly — upgrading requires replacing the unit.

Which is better for high-speed lines?

Double head uncoilers are essential for high-speed production.

Which should I choose?

Choose single head for low volume and simplicity
Choose double head for efficiency and continuous production