10 Steps to Specify an ERW Tube Mill: Tube Size to Full Line
Choose the mill model from your maximum OD and wall thickness, then use strip, material, coil, speed, cutting, power and site data to define the full line.
Read article02 · COIL FEEDING
Uncoilers
The uncoiler holds the steel coil and pays off strip as the entry section requires. It is the first machine in a tube mill, slitting or cold roll-forming line. Also known as a decoiler.
Its role in production
Illustrative render Its place in the lineAn uncoiler has one job: hold a full coil securely and release strip at the speed required by the entry feeding section. It determines whether a coil goes on smoothly and also affects whether coil changes run without trouble.
Our uncoilers are grouped by expansion method, manual, pneumatic or hydraulic, and by layout, single-head, double-head or double top-cone. A single-head uncoiler is simple and suits lines with infrequent coil changes. A double-head uncoiler lets the operator load the next coil on one head while the other pays out; a 180-degree turn brings the prepared coil into position, followed by threading and joining, making it suitable for lines with matching storage and joining arrangements. Double top-cone uncoilers clamp the coil between two cones and suit wide, heavy coils. Braking is by band or disc brake; coils are loaded by crane or by a loading car.
Check coil weight, strip width, strip thickness, inside diameter and outside diameter together. A model suffix containing T denotes rated coil weight in metric tons; numbers in other model codes should not automatically be read as tonnage. Heavy coils can be handled with a loading car and support arm; a powered base swivel and powered unwinding kit reduce manual work. The width and thickness range of each model is listed in the table below.
Uncoilers are usually supplied together with the leveler, shear and butt welder and accumulator as the entry section of a tube mill, but they are also supplied individually or as replacements on existing lines. Please tell us the pay-off direction, the pass line height and the space available.
Specify the actual combinations of coil weight, inside diameter, outside diameter and strip width. Meeting each limit separately does not establish compatibility with every coil. Include your regular coil types, workshop handling method, loading arrangement and strip-end threading requirements.
For a retrofit, check alignment with downstream feeding equipment, unwinding direction, spacing and coordinated braking. A double-head arrangement allows preparation of the next coil, but continuity through a coil change also depends on the joining time and usable accumulator storage.
Used in these lines Tube mill lines · 12 models, complete lines
Photographs
Technical specifications
Actual specifications depend on the material and final equipment configuration.
- Coil weight
- 1.5–30 t
| Type | Model | Strip width mm | Strip thickness mm |
|---|---|---|---|
| Single-head manual uncoiler | DTKJ150 | ≤250 | ≤3 |
| Double-head manual uncoiler | STKJ150 | ≤120 | ≤4 |
| STKJ300 | ≤250 | ≤4 | |
| Single-head pneumatic uncoiler | QDKJ150 | ≤100 | ≤3 |
| QDKJ250 | ≤200 | ≤3 | |
| QDKJ350 | ≤300 | ≤4 | |
| QDKJ500 | ≤450 | ≤4 | |
| Double-head pneumatic uncoiler | VKJ1.5T | ≤100 | ≤3 |
| VKJ2.5T | ≤200 | ≤3 | |
| VKJ3.5T | ≤300 | ≤4 | |
| Single-head hydraulic uncoiler | YKJ3T | ≤450 | ≤4 |
| YKJ5T | ≤550 | ≤6 | |
| YKJ10T | ≤800 | ≤10 | |
| YKJ15T | ≤1200 | ≤12 | |
| Double-head hydraulic uncoiler | YKJ3T | ≤450 | ≤4 |
| YKJ5T | ≤550 | ≤6 | |
| YKJ10T | ≤800 | ≤10 | |
| YKJ15T | ≤1200 | ≤12 | |
| Double top-cone uncoiler | DYKJ10T | ≤800 | ≤10 |
| DYKJ16T | ≤1200 | ≤12 | |
| DYKJ20T | ≤1600 | ≤14 | |
| DYKJ30T | ≤2000 | ≤18 |
The T suffix is the rated coil weight in metric tons.
Source: company product catalogue (April 2025 edition), page 6.
| Item | Description |
|---|---|
| Coil loading car (heavy coils only) | 5 t / 10 t / 15 t / 20 t / 30 t |
| Powered base swivel | Replaces manual 360° horizontal rotation with electric control |
| Powered unwinding kit | Uncoiling head rotates vertically through 360° under electric control |
| Coil support arm | Supports heavy coils |
| Assisted unwinding kit | Electrically controlled pressure head drives the strip to ease unwinding |
Source: company product catalogue (April 2025 edition), page 6.
Start the equipment discussion with these requirements
Use these points to prepare the equipment discussion. Specifications and configuration depend on the project.
- Coil weight, inside and outside diameter
- Strip width and thickness range
- Coil change frequency: single-head or double-head
- Loading method: crane or loading car
- Expansion and braking requirements
- Pay-off direction and pass line height of the existing line
Continue along the line
Tell us your material, tube profile and output
We discuss the suitable model and configuration for your product and plant. Every line is configured per project, and pricing follows the configuration.