Executive summary This automated packaging line is engineered for slitted narrow steel strip coils. A heavy-duty 90° upender receives each coil and rotates it from vertical eye-to-wall orientation to a flat eye-to-sky position. A motorized roller conveyor transfers the coil to an automated through-the-eye strapping station, while a gantry pick-and-place unit stacks the finished coils securely onto downstream pallets. By maintaining the coils flat and mechanically stabilized at every stage, the line completely eliminates tipping risks and strip edge deformation.
Table of Contents
- What the machine does
- Why narrow coils need care
- Coils per pallet
- What we set per line
- Selection checklist
- Safety
- Engineering FAQ
- Next step
- Related reading
- Sources
What the machine does
| Step | What happens |
|---|---|
| Upending | A 90° upender rotates the narrow coil from eye-horizontal to flat eye-vertical orientation. |
| Conveying | Heavy-duty motorized conveyors transfer the coil smoothly to the strapping zone. |
| Strapping | An automatic strapping head applies radial bands through the coil eye under controlled tension. |
| Operators | Technicians monitor the automated cycle and line parameters via the HMI console. |
| Stacking | A dedicated gantry stacking head picks and positions finished narrow coils onto the pallet. |
Why narrow coils need care
- Tipping. A narrow coil standing on edge has an unfavorable aspect ratio and high center-of-gravity instability; turning it flat completely eliminates tipping hazards.
- Loose wraps. Thin strip maintains elastic spring-back; automated radial straps hold the outer wraps firmly in place.
- Edge damage. Exposed strip edges easily dent or burr if adjacent coils knock together; automated flat transfer ensures zero edge collision.
- Stack height. Slit coils must be built into stable vertical pallet stacks to optimize logistics density.
For narrow slit coils, our standard packaging line covers strip widths of 8–500 mm, unit weights of 30–4,000 kg, coil outer diameters (OD) of 500–1,500 mm (extendable up to 2,100 mm), and inner diameters (ID) of 300 / 508 / 610 mm, operating at an overall throughput of 20–40 coils/hr with a strapping cycle time of ≤15–38 seconds per strap [manufacturer rating]. Dedicated vertical lines accommodate heavy-duty coils from 150–6,500 kg up to 25,000–33,000 kg [manufacturer rating].
Coils per pallet
Worked example (illustrative).
| Item | Value |
|---|---|
| Coil width (illustrative) | 60 mm |
| Allowed stack height (illustrative) | 900 mm |
| Coils per stack, 900 ÷ 60 | 15 |
| Coil weight (illustrative) | 50 kg |
| Stack weight, 15 × 50 | 750 kg |
What we set per line
| Setting | Depends on |
|---|---|
| Upender | Coil weight capacity and cycle speed requirements |
| Straps | Straps per coil (typically 2 to 4 radial straps) |
| Stack | Maximum stack height and pallet load capacity |
| Pallet | Pallet footprint, timber layout, and centering pattern |
Selection checklist
- Coil OD, ID, slit width (8–500 mm narrow range), and coil weight (30–4,000 kg) [manufacturer rating].
- Straps required per coil (PET, PP, or high-tensile steel strapping).
- Maximum pallet stack height and total pallet weight threshold.
- Pallet dimensions, fork pocket configuration, and stacking pattern.
- Desired throughput in coils per hour (matching upstream slitter output).
- Protective packaging requirement: dry strapping only or integrated through-the-eye wrapping.
Safety
- Keep clear of the upender cradle, strapping head indexing zone, and gantry traverse envelope during operation.
- Stay completely outside the interlocked perimeter perimeter fencing around the gantry stacker and conveyor line.
- Always apply standard OSHA Lockout/Tagout (LOTO) protocols to all electrical and pneumatic power isolation points prior to maintenance or clearing strapping jams.
- For CE-regulated markets, machine design, interlocking guards, and emergency circuits comply fully with ISO 12100:2010 and EN 415-10:2014, governed by fail-safe Siemens S7-1200 or S7-1500F safety PLCs [manufacturer rating].
Engineering FAQ
Q: Why turn narrow coils flat? A: A narrow slit coil standing on its rim has minimal lateral support and tips easily under slight acceleration. Rotating it flat (eye-to-sky) establishes full surface contact on the conveyor, ensuring inherent mechanical stability throughout strapping and transfer.
Q: Why strap through the eye? A: Circumferential outer-wrap strapping cannot prevent internal telescoping or strip uncoiling on narrow bands. Feeding the strap through the coil eye applies direct radial clamping force across the strip layers, preventing spring-back and looseness.
Q: How many coils per stack? A: Stack count is determined by dividing the maximum permissible stack height by the individual slit width, capped by the structural weight capacity of the pallet. In our worked example, a 900 mm height limit accommodates exactly 15 coils of 60 mm width.
Q: Can wrapping be added? A: Yes. An automated through-the-eye orbital wrapping station can be integrated directly between the strapping station and the gantry stacker, applying stretch film, crepe paper, VCI anti-corrosion film, or composite fabrics to meet transport moisture-barrier requirements [manufacturer rating].
Q: What limits the stack? A: The stack is limited by the warehouse ceiling clearance, internal transport limits (forklift/AGV rating), downstream container door heights, and the mechanical payload threshold of the wooden or steel pallet.
Q: Which standards apply? A: Machine design and functional safety follow ISO 12100:2010 (General principles for design – Risk assessment and risk reduction) and EN 415-10:2014 (Safety of packaging machines – General requirements).
Next step
We configure and match your narrow coil packing line through three engineering steps:
- Submit your layout drawing including coil dimensional envelopes, weight ranges, and target coils per hour to info@fhopepack.com.
- Receive a proposal within 48 hours complete with dimensional line footprint, mechanical specifications, and cycle time simulations.
- Book a site survey with our engineering team to inspect and confirm the slitter exit runout configuration.
Related reading
- Steel Coil Packaging Line: The Complete Process Step by Step
- Slit Coil Handling to Stacking Line
- Narrow Coil Strapping, Wrapping and Gantry Stacking Line
- Slit coil packing line
Sources
- Slit coil handling and packaging line specifications: FHOPE engineering technical data sheets
- Machine in action: Slit Coil Packaging Line engineering layout reference
- Coils per pallet: engineering sizing calculation, illustrative values
- Machine safety standards: ISO 12100:2010; EN 415-10:2014
- Proposal timing: FHOPE industrial standard turnkey quotation protocol (proposal within 48 hours)
Last reviewed: 2026-10-29
