Full-Automatic Large Coil Wrapping Machine: Industrial Through-Eye Orbital Packaging Line

Executive summary

Large steel, aluminum, copper, wire rod, and industrial cable coils require protective packaging that maintains structural containment without variance from shift to shift. A full-automatic through-eye wrapping machine secures horizontally positioned (eye-to-sky) coils by driving a heavy-duty rotary ring through the coil inner diameter (ID), synchronizing ring velocity with powered base rotation to guarantee uniform overlap and film pre-stretch tension. Designed for heavy industrial packaging bays, the automated cell handles payloads up to 10 metric tons while isolating operators from moving rotating rings and active coil transit conveyors. Line dimensions, mechanical envelopes, and PLC integration interfaces are confirmed per project.

Table of Contents

Why automate large coil wrapping

Manual or semi-manual wrapping of heavy industrial coils introduces inherent process instability. Stretch tension, circumferential overlap, and layer count inevitably fluctuate between operational shifts. Insufficient overlap exposes sensitive metals to ambient moisture, atmospheric oxidation, industrial dust, and mechanical surface scuffing during transit. Conversely, uncontrolled manual wrapping wastes costly stretch film or VCI (Vapor Corrosion Inhibitor) materials without increasing package integrity.

Carrying 15 kg to 25 kg film rolls into the confined inner diameter (ID) of massive coils exposes workers to severe musculoskeletal strain, pinch-point entrapment, and crush hazards. An automated through-eye wrapping cell eliminates these risks entirely:

  • Consistent encapsulation: Digital servo and variable-frequency drives lock the film overlap between 20% and 80%, ensuring airtight moisture barriers.
  • Repeatable containment force: Motorized pre-stretch maintains constant elongation, locking coil slit wraps or wire strands firmly without core deformation.
  • Zero-contact operator safety: Conveyors and automated rotating rings execute cycles automatically, separating workers from heavy material paths.

Structure and build

The machine structure is engineered to withstand continuous shock loads generated by industrial coil staging and high-speed orbital rotation. Fabricated from structural carbon steel hollow sections (ASTM A500 / S355JR) and stress-relieved weldments, the rigid mainframe houses the radial ring guidance system, drive mechanisms, and base roller stations.

Key structural assemblies include:

  1. Vertical portal frame: Houses the main ring assembly, guiding either a high-tensile alloy ring or an opening C-frame track via precision polyurethane-faced support and guide rollers.
  2. Rotating base station: Equipped with heavy-duty dual-drive polyurethane-coated support rollers that cradle the horizontal coil (eye-to-sky), providing smooth circumferential indexing.
  3. Heavy-duty tie-tie chassis: Bolted directly to factory sub-foundations, dampening rotational vibrations induced by high-RPM film carriage orbits.

Ring and film carriage

The rotating ring serves as the primary dynamic vector, carrying the film carriage through the inner core and around the outer circumference of the coil. The drive system utilizes heavy-duty timing belts or direct-gear engagement, powered by an inverter-driven motor with integrated dynamic braking, maintaining steady rotational speeds between 20 RPM and 60 RPM.

The film carriage mounted on the orbital ring features:

  • Motorized power pre-stretch: Electrically driven dual pre-stretch rollers elongate film by 150% to 300% prior to coil contact, significantly lowering film consumption while enhancing puncture resistance.
  • Tension modulation: Mechanical friction brakes or closed-loop electromagnetic powder clutches regulate film tail-off tension, preventing edge snap on sharp coil crowns.
  • Material versatility: Accommodates standard LLDPE stretch film, heavy-duty woven HDPE tape, creped kraft paper, or composite VCI anti-corrosion barrier films (widths 100 mm to 250 mm).

Conveyor and positioning

The material transit system is an integrated mechanical assembly engineered to match upstream slitting or coil processing lines. Heavy structural roller beds, walking beams, or motorized saddle chain conveyors transport coils into the wrapping envelope without manual crane maneuvering.

Before the orbital cycle initiates, an integrated positioning mechanism aligns the coil:

  • Hydraulic / electromechanical centering: Dual-action centering arms align the coil center point with the ring orbit trajectory.

  • Vertical height matching: Hydraulic scissors or screw-jack lifters adjust the relative elevation between the coil eye bottom and the ring track, ensuring clearance:

    Clearance = Ring_Inner_Radius - (Coil_Radial_Thickness + Carriage_Envelope)

This automated positioning guarantees that wrapping material wraps symmetrically across the toroidal profile rather than shifting eccentrically.

Control and recipes

Process automation is governed by an industrial programmable logic controller (Siemens S7-1200/1500 or Allen-Bradley CompactLogix) paired with a high-resolution color touchscreen HMI.

The software architecture operates on stored parametric recipes, standardizing parameters across different coil stock:

  • Settable recipe parameters: Ring rotational velocity (RPM), base roller rotational velocity, wrap overlap percentage (20%–80%), reinforcement wraps at coil edges, and target film tension (N).
  • Automated changeover: Operators select the assigned coil code (e.g., “Steel_Slit_1200OD” or “Copper_Wire_Pack_B”), automatically reconfiguring all acceleration curves, tension sets, and indexing steps without mechanical adjustment.
  • Diagnostics and telemetry: On-screen status diagnostics identify photo-eye faults, pneumatic pressure drops, emergency stop locations, and film-break triggers, simultaneously tracking batch metrics for maintenance scheduling.

Safety and line integration

The wrapping station is fully engineered for turnkey integration into automated packaging and dispatch lines, meeting international safety compliance standards.

Key safety and system interlocking features:

  • Physical guarding and optical barriers: Heavy wire mesh perimeter fencing with safety-interlocked access doors (PLe / SIL 3 category interlocks) and entry/exit safety light curtains.
  • Fail-safe dynamic stopping: Spring-applied electromechanical motor brakes bring the rotating ring to a verified stop within 1.5 seconds upon an E-stop or perimeter breach.
  • Upstream and downstream handshake: Profinet, Ethernet/IP, or dry-contact digital handshakes interface with upstream uncoilers/turnstiles and downstream strapping stations, coordinating interlock readiness and clear-to-convey flags.

Typical configuration

The operational specifications below outline standard design baselines. Final mechanical stroke, drive capacities, and structural frames are confirmed per project requirements.

Parameter Standard Design Envelope Industrial Customization Options
Coil Outside Diameter (OD) 800 mm to 2,000 mm Custom frames up to 2,600 mm OD
Coil Inside Diameter (ID) Minimum 450 mm to 508 mm standard Sized to match customer mandrel min ID
Coil Width / Height 200 mm to 1,200 mm Multi-tier stacking or narrow-slit packaging
Maximum Coil Weight 1,000 kg to 10,000 kg Heavy-duty base assemblies up to 25 metric tons
Ring Rotation Speed 20 RPM to 60 RPM (VFD-regulated) High-speed balanced rings for line cycles
Packaging Materials LLDPE stretch film, VCI film, Paper, HDPE Dual-material carriages for two-layer wraps
Film Overlap Range 20% to 80% user-programmable Spot reinforcement at inner/outer edges
Electrical Supply 380 V / 415 V / 480 V, 3-Phase, 50/60 Hz Auxiliary feeds and localized control voltage

What the video shows

The demonstration footage showcases a horizontal-bed through-eye coil wrapping machine handling a large diameter annular coil.

Core machine sequences highlighted include:

  1. The coil is positioned flat on heavy polyurethane support rollers, oriented eye-to-sky.
  2. The rotating shuttle passes radially through the coil core opening, applying tensioned stretch wrapping continuously around the cross-sectional ring.
  3. Support rollers drive the coil slowly about its central vertical axis, ensuring continuous, uniform spiral overlap across the outer circumference, core inner diameter, and flat side walls.
  4. Smooth acceleration and deceleration cycles run without film breakage, producing a fully encapsulated, water-resistant unit load ready for crane or forklift offloading.

Selection checklist

Before confirming equipment engineering drawings, provide our engineering team with the following operational data:

Project Metric Engineering Verification Focus
Coil Dimensional Envelope Minimum / maximum Outer Diameter (OD), Inner Diameter (ID), and pack width
Coil Mass Range Minimum and maximum coil payload per batch cycle (kg/ton)
Material Characteristics Bare steel, coated aluminum, slitted strips, or stranded wire/cable reels
Wrapping Material Strategy Single stretch film, co-extruded VCI anti-rust barrier, or woven outer cover
Material Handling Setup Overhead crane C-hook, forklift prong, turnstile, or in-line chain conveyor
Floor & Level Tolerances Plant conveyor top-of-roller height (TOR) and structural floor load capacity

Operation and safety

Operation is streamlined to minimize operator intervention:

  1. Select the pre-programmed coil recipe from the touchscreen terminal.
  2. Convey the coil onto the centering station via automated roller sequence or staging crane.
  3. Initiate cycle start; the system automatically clamps, positions, applies pre-stretched film through the core, and finishes the wrap cycle.
  4. Automatic cut-and-clamp units secure the film tail, releasing the coil for downstream conveying.

Safety Rules: Never bypass interlocked safety access doors or tamper with active light curtains while the ring drives are energized. Lockout-Tagout (LOTO) protocols must be strictly enforced during film carriage spool reloads, roller maintenance, or rail lubrication.

Engineering FAQ

Q: Can the machine handle coils with varying inner and outer diameters on the same line? A: Yes. As long as coil dimensions fall within the project clearance envelope (minimum ID and maximum OD/width diagonal), the VFD-controlled drives automatically adjust rotation ratios via recipe parameters.

Q: How does the system prevent stretch film tearing on sharp slit coil edges? A: The carriage combines powered pre-stretch with a dynamic acceleration buffer and adjustable edge corner-delay settings, softening initial impact tension along sharp steel edges.

Q: Does the operator need to thread film manually through the coil eye during each cycle? A: No. After initial roll loading, automated pneumatic cut-and-clamp arms grasp, cut, and tack the film tail at the end of each cycle, readying the carriage for the next incoming coil.

Q: Is the machine compatible with non-stretch barrier materials like paper or VCI film? A: Yes. We engineer mechanical friction spindles or dedicated secondary dispensing carriages capable of tracking non-stretch materials, woven tapes, or dual-layer combined packaging.

Q: Can this machine be integrated into an existing continuous processing slitting line? A: Yes. The onboard PLC connects directly with plant SCADA/MES systems via Profinet or Ethernet/IP, coordinating safety gates, payload handshakes, and indexing tables.

Next step

  1. Submit Line Specifications: Email your coil dimension matrix (ID/OD/Width/Weight) and wrapping requirements to info@fhopepack.com.
  2. Receive Technical Proposal: Our application engineering department delivers a customized proposal, layout footprint (2D/3D DWG), and cycle time analysis within 48 hours.
  3. Engineering Layout Review: We coordinate an on-site or virtual engineering review to confirm conveyor centerline heights, safety fencing boundaries, and PLC communication protocols.

Related reading

Sources and standards

FHOPE full-automatic large coil wrapping machine series technical overview. Reviewed as an industrial baseline specification; customized coil envelopes and cycle rates confirmed per project.

Last reviewed: 2026-10-10

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