Executive summary A movable trolley coil wrapping machine provides eye-through stretch film packaging for industrial metal coils directly beside the production line. A forklift or crane places each steel coil horizontally onto the supporting roller saddle. The motorized trolley traverses forward to insert the rotating orbital ring directly through the coil eye. As the coil rotates on the driven rollers, the ring dispenses stretch film through the center bore to apply a continuous helical wrap, while the film delivery carriage remains mounted on the rotating ring. Once wrapping is complete, the trolley retracts to clear the station for unobstructed unloading.
Table of Contents
- What the clip shows
- How the trolley helps
- Film turns per coil
- What we set per coil
- Selection checklist
- Safety
- Engineering FAQ
- Next step
- Related reading
- Sources
What the clip shows
| Step | Operation Sequence |
|---|---|
| Loading | A forklift sets the steel coil horizontally onto the driven saddle rollers |
| Trolley | The motorized trolley advances to position the wrapping ring through the coil eye |
| Wrap | Stretch film passes through the coil bore while driven rollers rotate the coil |
| Ring Carriage | The film tension dispenser is carried directly on the rotating orbital ring |
| Unload | The trolley retracts to the home position and the packaged coil is lifted clear |
How the trolley helps
- Open loading. The traversing trolley retracts the orbital ring completely clear of the saddle station, allowing vertical overhead crane loading or unobstructed front forklift access.
- Fits the eye. The motorized trolley precisely positions the rotating ring aperture concentrically with the coil eye across varying coil widths.
- Plant floor ready. Designed for decentralized installation beside slitting lines, rolling mills, or storage bays to eliminate unnecessary coil transport.
- Multi-station adaptability. As an engineering feature of this machine family, a mobile trolley wrapper can be indexed across multiple loading saddles or coil bays to service parallel process lines [manufacturer rating].
- Sizes vary. Ring aperture, chassis stroke, and saddle roller center distance are engineered to match project-specific coil dimensions.
Film turns per coil
The required number of orbital ring rotations is governed by coil outer diameter, film width, and specified overlap ratio.
Worked example (illustrative):
| Item | Value |
|---|---|
| Coil outer diameter (illustrative) | 1,200 mm |
| Outer circumference, 3.14 × 1,200 | 3,768 mm |
| Film width (illustrative) | 100 mm |
| Overlap (illustrative) | 40% |
| Advance per ring turn, 100 × (1 − 0.40) | 60 mm |
| Ring turns per coil revolution, 3,768 ÷ 60 | about 63 |
(Note: Calculation assumes rigid geometry and zero film neck-down. Operating ring turns are fine-tuned via the PLC interface based on tension setting and packaging profile.)
What we set per coil
| Setting | Engineering Parameter Dependencies |
|---|---|
| Ring size | Coil outer diameter (OD), minimum inner diameter (ID), and total width |
| Trolley stroke | Axial coil width and overhead clearance envelopes |
| Overlap ratio | Target moisture/dust barrier requirements; adjustable between 10% and 90% via inverter drive [manufacturer rating] |
| Packaging material | Application requirement; supports LLDPE stretch film, PVC, PE, crepe paper, and HDPE protective tape [manufacturer rating] |
Selection checklist
- Coil outer diameter (OD) and inner bore diameter (ID) ranges.
- Maximum and minimum coil axial width.
- Maximum coil payload weight (kg).
- Throughput target (coils per hour).
- Required protective material (LLDPE stretch film, VCI anti-corrosion film, or woven HDPE).
- Facility material handling method (forklift ram, c-hook crane, or coil car).
Safety
- Maintain complete exclusion zones around the motorized trolley track and orbital ring path during cycle execution.
- Interlocked physical perimeter perimeter fencing must remain closed and monitored while the line is energized.
- Variable-frequency drive (VFD) controls provide soft-start and soft-stop acceleration profiles to prevent mechanical shock and ring inertia overload [manufacturer rating].
- Strictly execute Lockout/Tagout (LOTO) procedures before entering the perimeter for film replenishment or clearing packaging tail jams.
- Fully compliant with European CE machinery directives, designed in accordance with ISO 12100:2010 risk reduction principles and EN 415-10:2014 safety requirements for wrapping machines.
Engineering FAQ
Q: What is the primary function of the motorized trolley? A: The trolley provides automated linear travel. It traverses forward to insert the orbital wrapping ring through the coil bore for wrapping, and retracts clear to provide an open, collision-free envelope for crane or forklift loading.
Q: How are steel coils loaded onto the machine saddle? A: Coils are positioned horizontally onto dual heavy-duty polyurethane-coated saddle rollers using a forklift fitted with a coil boom or an overhead crane with a C-hook.
Q: How many ring turns are required for a standard coil? A: For a 1,200 mm OD coil wrapped with 100 mm film at a 40% overlap ratio, the machine executes approximately 63 orbital ring rotations per single full rotation of the coil, as outlined in the illustrative calculation.
Q: Can this machine be integrated directly beside a slitting or cut-to-length line? A: Yes. The compact floor-mounted rail footprint allows standalone installation adjacent to slitting exits, packing lines, or intermediate bay storage.
Q: Which wrapping materials are compatible with the orbital ring? A: The ring dispenser accommodates industrial LLDPE stretch film, VCI anti-rust films, PVC, woven PE, paper, and reinforced HDPE wraps, with film width and tension calibrated to product integrity specifications.
Q: Which international safety and design standards govern this equipment? A: For European and international markets, the equipment is engineered under ISO 12100:2010 (Safety of Machinery – General Principles for Design) and EN 415-10:2014 (Safety of Packaging Machines – General Requirements).
Next step
To configure an eye-through trolley wrapping system tailored to your facility:
- Submit your layout drawing along with coil dimensions (OD, ID, width), maximum payload weights, and required hourly throughput to info@fhopepack.com.
- Receive a proposal within 48 hours, including equipment specifications, functional layout drawings, and cycle-time calculations.
- Book a site survey or technical alignment meeting to verify foundation ratings, floor clearance envelopes, and material handling access.
Related reading
- Steel Coil Eye-Through Film Wrapping
- Coil Packing Machine: Packing and Handling
- Eye-Vertical Coil Stretch Wrapper
- Coil packing machine
Sources
- Equipment Engineering Specification: FHOPE Engineering Team, design file reviewed 2026-10-10
- Orbital Stretch Wrapper Technology: FHOPE Horizontal Orbital Stretch Wrapper Family
- Machine Series Benchmark: FHOPE Steel Coil Packing Machine with Trolley (FPS Series)
- Operational Video Reference: Coil Wrapping Demonstration Video on YouTube
- Mathematical Formulations: Packaging cycle model, illustrative turn calculations
- Safety Directives: ISO 12100:2010; EN 415-10:2014 Packaging Machine Safety
- Standard Commercial Response Framework: FHOPE industrial sales SLA (48-hour proposal dispatch)
Last updated: 2026-10-29
