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Automatic Decoiler vs Manual Decoiler: When to Upgrade
1. What buyers mean by “automatic”
On roll-forming RFQs, automatic decoiler usually means the mandrel is driven: a motor (often with a VFD) pays off strip so tension follows the mill, instead of the mill dragging a free reel against a hand brake. Hydraulic expansion of the eye is a separate option. A coil car is a third. None of these makes the reel unmanned — someone still loads the coil.
The existing decoiler encyclopedia already maps types (manual / hydraulic expand / motorized / double-head / vertical). This page is only the upgrade question: keep the hand reel, or buy driven payoff.
2. What a manual decoiler is
A manual unit expands the mandrel with a handwheel or lever and holds back-tension with a friction brake. The forming mill (or an operator pulling the first wraps) takes the strip. There is no VFD clip on this machine. If a video shows a motor on the mandrel, it is not this page.
A verified named process quotation is a 5 t manual decoiler: mechanical expand, friction brake, base frame and coil support packed in two crates, blue finish as standard. Loading is crane or fork. That 5 t nameplate is one build. The older type table in the general decoiler wiki lists many manuals in a 1–3 t band for prototype and thin-gauge work — those are typical ranges, not this 5 t crate.
The job the operator cannot skip: centre the coil before the mill pulls, and live with the brake. Too loose and the strip loops; too tight and the mill stretches light gauge or stalls.
3. What an automatic decoiler adds
Driven payoff: the mandrel turns under power, usually a little slower than line speed so the strip stays in tension. As coil OD falls, drive speed has to rise if you want the same strip speed. Better packages add a dancer or loop arm so the drive is not a fixed hunch.
Hydraulic expand (cylinder, not a handwheel) is common on the same frame once coils get heavy, because expanding a tight eye by hand on a 7–10 t coil is slow and off-centre coils walk when the drive ramps. A press arm holding the outer wrap when bands are cut is a safety item, not “automation.”
A verified motorized example in this catalogue is a 7 t electric decoiler: four-segment expand plates, 6215 bearings, main motor 3 kW through a 4 kW VFD, brake required on stop, electrics on that specification 350 V / 50 Hz / 3φ (check the nameplate). Single head. Same-order dual-layer roof mill and 5 t manuals on that host are other machines — their numbers stay off this reel.
4. When the upgrade is real
| Situation | Manual is usually enough | Driven / automatic payoff is the usual ask |
|---|---|---|
| Line speed | Stop-cut roof or purlin at a few metres per minute; mill can pull the reel | Stud, hat/strut, some shutter — high m/min, brake hunting all shift |
| Gauge | Light colour-coat the mill can drag without necking | Heavier strip the mill cannot pull smoothly, or thin strip that stretches on a harsh brake |
| Coil mass | Crew can expand and centre without a fight (the 5 t manual exists for a reason) | Eye expansion and start-up walk need hydraulics and a controlled ramp |
| Punch / servo feed | Simple host, no accumulator | Pre-punch that needs stable entry tension |
A slow 5 t roof mill does not become a better mill because the decoiler has a VFD. Spend the money on the mill if the reel is not the bottleneck. Upgrade the reel when slack loops, stretched strip, or changeover time are the weekly complaint.
5. Named builds
| Build | What it is | Keep separate |
|---|---|---|
| 5 t manual | Hand expand, friction brake, mill pulls | Not a 7 t VFD reel; that quotation does not list a coil car |
| 7 t electric | 3 kW + 4 kW VFD, four-segment expand, brake | Not the dual-head 4 t/side hydraulic; 350 V stays on that 7 t specification |
| Hydraulic expand + car | Loading and eye expand | Not automatically “closed-loop tension” |
General wiki bands (manual 1–3 t, hydraulic 3–15 t, motorized 5–25 t) are selection neighbourhoods. The 3 kW motor stays on the 7 t electric reel; 50 m/min stays on the mill that names it, not on a stop-cut roof line.
6. What to put on the RFQ
- Max coil mass, width, ID, OD
- Strip thickness and grade
- Host speed and whether cutoff is stop-cut or tracking
- Hand expand vs hydraulic expand vs motorized payoff — say all three, not just “automatic”
- Coil car yes/no; press arm yes/no
- Single head vs dual head (separate article)
- Voltage / frequency / phases
7. Buyer FAQ
Is a hydraulic decoiler an automatic decoiler?
Hydraulic expand is the eye. Automatic payoff is the drive (or a specified brake + dancer). Write both on the purchase order if you want both.
We already have a 5 t manual. When do we replace it?
When coil weight or line speed makes brake setting a weekly fight, or when a car would cut crane time enough to matter. Otherwise keep it.
Does automatic mean no operator at the reel?
No. Load, thread, last wraps, and watching a walking coil still need a person. Dual-head only cuts waiting for the crane.
Can I copy the 7 t / 3 kW motor onto every “automatic” inquiry?
No. That set is one named electric build. Coil width and mill speed change the drive.
Commercial terms come back on the offer.
References
- ZTRFM wiki: Decoiler Types and Selection (type table, tension methods, coil car)
- Process library: Manual Decoiler (5T) — hand expand, mill pulls
- Process library: Electric Decoiler (7T) — 3 kW / 4 kW VFD, four-segment expand, 350 V/50 Hz on that specification