ERW Tube Mill Decoiler / Uncoiler Selection Guide – Single-Head, Double-Head, Double-Cone

A decoiler (uncoiler) is one of the most important components in the entry section of an ERW tube mill. Selecting the correct decoiler directly affects strip feeding stability, welding quality, and the overall productivity of your tube mill line.

This guide explains the three main types of decoilers, their advantages, and how to select the right model based on coil weight, width, thickness, line speed, and production mode.

Types of Decoilers Used in ERW Tube Mills

1. Single-Head Decoiler (Single Mandrel Uncoiler)

Best for standard tube mills, steady production, and medium coil weight.

⭐Main Features

• One mandrel for loading a single coil

• Manual or hydraulic expansion

• Magnetic / pneumatic brake

• Can be equipped with a coil car

⭐Advantages

• Lowest cost

• Simple structure, easy maintenance

• Suitable for most standard strip thickness (0.5–4.0 mm)

⭐Limitations

• Requires stopping the line during coil change

• Not suitable for high-speed production

2. Double-Head / Turret Decoiler (Non-Stop Coil Change)

Ideal for high-speed and high-output ERW tube mills.

⭐Main Features

• Two mandrels: Working side + Standby side

• 180° turret rotation for non-stop coil change

• Hydraulic expansion mandrel

• Designed for continuous production

⭐Advantages

• Coil change without stopping the line

• Maximum productivity and uptime

• Perfect for high-speed lines (80–150 m/min)

⭐Limitations

• Higher price

• Requires larger installation space

• More complex control system

3. Double-Cone Decoiler (Cone-Type Uncoiler)

Best for small coils, narrow strips, 그리고 small OD tube mills.

⭐Main Features

• Two adjustable cone heads clamp the coil

• No mandrel expansion needed

• Designed for quick loading and unloading

⭐Advantages

• Fast coil handling

• Simple structure, economical

• Perfect for narrow strip (20–120 mm)

⭐Limitations

• Limited coil weight (0.5–3 tons)

• Not suitable for wide or heavy coils

• Not recommended for high-speed production

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How to Select the Correct Decoiler for Your Tube Mill

1. Coil Weight (Most Important Factor)

💡 Rule: The heavier the coil, the stronger the mandrel and hydraulic system must be.

2. Strip Width (Directly Related to Tube Diameter)

3. Strip Thickness (Affects Tension Requirement)

💡 The thicker the strip → the higher the tension → the stronger the braking system needed.

4. Line Speed

💡Step 1 — Identify Coil Weight, Width, Thickness

These three values define the mechanical strength required.

💡Step 2 — Decide Whether You Need Non-Stop Production

• Yes → Choose Double-Head / Turret

• No → Single-Head or Double-Cone

💡Step 3 — Match Line Speed & Material Strength

High-speed or high-strength steel → stronger mandrel + advanced tension control.

Comparison Table 

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Looking for the right decoiler for your ERW tube mill?

We can recommend the best model based on your coil specs and production requirements.

📩 Contact us:
Hebei AIS Machinery Equipment
Phone/WhatsApp: 86-15176910262
Email: LINDA@AISMACHINERY.COM