Automatic coiling and wrapping machine for steel wire and wire cable

> **Executive Summary**
>
> In continuous extrusion and rewinding lines, wire and cable exit the downstream caterpillar haul-off at linear speeds up to 200 m/min. Converting this endless stream into discrete, tightly wound, metered, and film-wrapped coils requires seamless synchronization. Our automatic cable coiling and wrapping machine integrates precision optical/mechanical metering, vertical-spindle collapsible coiling, pneumatic cutting, positive transfer, and orbital wrapping under a single unified Siemens/Omron PLC architecture. Operating at throughput rates of 2.0 to 2.5 coils per minute, this system eliminates manual handling, prevents coil relaxation, and synchronizes with continuous upstream extrusion via a vertical dancer accumulator. Below is the operational workflow, engineering data, kinematic matching formulas, and technical selection criteria.

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The automated coiling system installs inline directly behind the cooling trough, capstan, or high-speed pay-off, receiving continuous cable through a vertical counterweighted accumulator. At the winding head, a motorized vertical spindle equipped with a pneumatic collapsible core and overhead clamp plate locks the cable leading end, winds the predetermined length under active torque control, and performs automatic shear cutting. An integrated pneumatic pusher-gripper transfer unit smoothly shifts the bound coil onto the wrapping station table, preventing loop snarls, before the packaged coil discharges via a heavy-duty roller conveyor.

<h2 id="table-of-contents">Table of Contents</h2>

<ul>
<li><a href="#why">Why coil and wrap inline</a></li>
<li><a href="#how">How the line works</a></li>
<li><a href="#specs">Coiler data</a></li>
<li><a href="#speed">Matching coil length to line speed</a></li>
<li><a href="#selection-checklist">Selection checklist</a></li>
<li><a href="#safety">Safety</a></li>
<li><a href="#engineering-faq">Engineering FAQ</a></li>
<li><a href="#next-step">Next step</a></li>
<li><a href="#related-reading">Related reading</a></li>
<li><a href="#sources">Sources</a></li>
</ul>

<h2 id="why">Why coil and wrap inline</h2>

Manual or off-line coiling introduces severe operational bottlenecks in wire and cable manufacturing:
* **Tension and Geometry Inconsistencies**: Manual take-ups suffer from variable winding tension, leading to loose inner layers, flared outer wraps, and inconsistent coil outer diameters (OD) that stall automated cartoning or shrink-packaging machines.
* **Length Inaccuracies and Material Scrap**: Mechanical slip in uncalibrated counter wheels creates length tolerances exceeding ±1.5%, causing customer disputes or expensive giveaway.
* **Secondary Handling Damage**: Transferring unsecured coils by hand risks conductor deformation, jacket scuffing, and coil tangling (bird-nesting) from residual torsional stress.
* **Labor Overhead and Line Throttling**: A high-speed extrusion line running at 150–200 m/min produces a standard 100-meter building wire coil every 30 to 40 seconds, easily overwhelming manual operators and forcing extruder line de-rating.

An inline automated coiling and wrapping cell captures the continuous extrusion flow, meters exact lengths, collapses the core for instant clearance, and securely wraps the toroidal body within an orbital eye-to-sky stretch film or shrink film envelope—delivering pallet-ready coils without secondary touchpoints.

<h2 id="how">How the line works</h2>

The complete automated cycle executes six tightly interlocked kinematic stages:

1. **Continuous Buffer and Tension Regulating (Dancer Accumulator)**: Cable leaves the extruder capstan or motorized pay-off and threads through a vertical pneumatic dancer accumulator frame. The accumulator moves vertically along precision linear guides to store line buffer during coil transfer, maintaining constant line tension (±1.0 N) so upstream extrusion speed remains entirely undisturbed.
2. **High-Precision Length Metering**: Dual-wheel optical encoders with polyurethane-coated anti-slip tracking wheels measure linear travel with a resolution down to 0.01 m, triggering PLC deceleration profiles as the target length (0.01 to 500 m) approaches.
3. **Synchronized Coiling and Layer Traversal**: The cable tip is captured by the pneumatic clamp of the coiling arbor. A servo-driven vertical coiling spindle accelerates smoothly along an S-curve profile. A pneumatic top-press roller and traversing guide level the wire turns across the barrel height (60–180 mm) to maintain flat, compact coil layers.
4. **Shear Cutting and Positive Coil Transfer**: Upon reaching the target length, the spindle decelerates to crawl speed, the pneumatic holding clamp engages the tail, and a high-hardness tool-steel guillotine blade cuts the wire clean. The coiling arbor sectors retract pneumatically (collapsible core), stripping the coil ID, while an automated cantilever sweep-arm or horizontal linear gripper moves the coil from the winding spindle onto the wrapping table.
5. **Intermediate Strapping (Recommended for High Spring-Back Wire)**: For stiff single-conductor wire or high-yield building cables, an automated indexing strapping head applies 2 to 4 radial polypropylene (PP) straps through the coil center, stabilizing the coil before film entry.
6. **Orbital Eye-to-Sky Wrapping / Shrink Finishing**: The coil enters a horizontal rotating ring orbital wrapping station. A vertical stretch film carriage rotates through the center eye of the coil while motorized polyurethane-coated support rollers rotate the coil around its vertical axis. The result is a dust-tight, moisture-resistant, 100% covered toroidal package discharged onto a gravity or driven roller outfeed.

<h2 id="specs">Coiler data</h2>

The standardized mechanical and electrical specifications below govern the baseline inline coiling, cutting, and wrapping system:

| Parameter Specification | Engineering Value / Baseline Range | Notes / Operational Margin |
| :--- | :--- | :--- |
| **Coil Inner Diameter (ID)** | 140–250 mm (Fixed per core set) | Interchangeable pneumatic expanding arbor barrels |
| **Coil Outer Diameter (OD)** | 200–600 mm | Sensor-monitored maximum OD limit |
| **Coil Barrel Height** | 60–180 mm | Motorized adjustable traverse width |
| **Cable Process Diameter** | 2.0–20.0 mm | Standard round PVC, PE, XLPE, and rubber cables |
| **Maximum Line Speed** | Up to 200 m/min | Constant linear speed during continuous extrusion |
| **Coiling Productivity** | 2.0–2.5 coils/min | Governed by coil length and cut-and-transfer window |
| **Length Metering Range** | 0.01–500.00 m | Electronic calibration factor via HMI screen |
| **Pneumatic System Requirement** | 0.6–0.8 MPa (6–8 bar) | Dry, lubricated plant air; nominal consumption 450 NL/min |
| **Electrical Power Rating** | AC 380 V ±10%, 50/60 Hz, 3-Phase | Total installed capacity: 15–22 kW (dependent on layout) |
| **Wrapping Overlap Ratio** | 20%–70% adjustable | Inverter-controlled orbital ring and turntable speeds |

*Note: For high-tensile steel wire strands or non-standard coil ID cores, motor torque drives and mechanical arbor structures are custom engineered.*

<h2 id="speed">Matching coil length to line speed</h2>

Continuous upstream processing requires strict mathematical balancing between extruder extrusion rate, accumulator buffer stroke, and coiler dead time.

### Fundamental Kinematic Balancing Formulas

1. **Theoretical Coiling Winding Time**:
   `t_wind = L_coil ÷ V_line`
   *(where `t_wind` is in minutes, `L_coil` is coil cut length in meters, and `V_line` is extruder linear speed in m/min).*

2. **Total Production Cycle Time Per Coil**:
   `t_cycle = t_wind + t_transfer`
   *(where `t_transfer` represents the non-productive mechanical transfer window: spindle ramp-down, shear cutting, arbor core collapsing, sweep-arm indexing, and core expansion).*

3. **Required Accumulator Storage Capacity**:
   `L_storage ≥ V_line × t_transfer × 1.15`
   *(A 15% dynamic safety coefficient accounts for mechanical deceleration profiles and dancer carriage inertia).*

4. **Effective Accumulator Stroke Length**:
   `S_stroke = L_storage ÷ N_loops`
   *(where `N_loops` is the total count of wire passes spanning between the stationary upper and traveling lower sheave blocks).*

+————————————————————————-+

### Engineering Calculation Example
* Line parameters: `V_line` = 200 m/min; Target coil throughput = 2.5 coils/min (`t_cycle` = 0.40 min = 24.0 s).
* Unit coil length: `L_coil` = 200 m/min ÷ 2.5 coils/min = 80.0 m.
* Measured mechanical transfer time: `t_transfer` = 4.5 s (0.075 min).
* Actual allowable winding time: `t_wind` = 24.0 s - 4.5 s = 19.5 s (0.325 min).
* Required maximum coiling take-up speed: `V_coiler_peak` = 80 m ÷ 0.325 min ≈ 246 m/min.
* Minimum stored wire length required during cut/transfer: `L_storage` ≥ 200 m/min × (4.5 ÷ 60) min × 1.15 ≈ 17.25 m.
* If a 12-strand accumulator sheave bank is installed (`N_loops` = 12), the physical vertical carriage stroke must be:
  `S_stroke` ≥ 17.25 m ÷ 12 ≈ 1.44 m.

*Constraint Rule*: If production requires shorter package lengths (e.g., 50 m coils at 200 m/min line speed), cycle time drops to 15 seconds. If `t_transfer` remains at 4.5 s, winding time must compress to 10.5 s, requiring peak coiling speeds near 300 m/min. If this exceeds motor dynamic limits or cable bend limits, the line must incorporate a **dual-head turret coiler** or operate at a moderated line speed.

<h2 id="selection-checklist">Selection checklist</h2>

To configure and quote an automated coiling and packing cell, prepare the following six engineering criteria:

1. **Cable Physical Characteristics**: Conductor material (copper, aluminum, CCA, steel), outer diameter range (mm), minimum bending radius, cross-sectional geometry (round, flat TPS), and jacket hardness/surface friction coefficient (Shore A/D).
2. **Coil Dimension Boundaries**: Specified core ID (mm), maximum finished coil OD (mm), package height range (mm), and coil weight limits (kg).
3. **Upstream Extruder Parameters**: Minimum and maximum linear line speeds (m/min), capstan motor feedback protocol, and existing continuous control signal interfaces (dry contact, 0–10 V, Profinet, Ethernet/IP).
4. **Accumulator Availability**: Presence, sheave diameter, and total buffer storage (m) of an existing in-line accumulator, or whether an integrated matching dancer must be supplied.
5. **Package Integrity Method**: Pure stretch film orbital wrapping, PE shrink film wrapping with heat tunnel, or automated radial strapping (2, 3, or 4 straps) prior to wrapping.
6. **Consumable and Palletizing Requirements**: Stretch film gauge and width (typically 20–35 µm LLDPE film, 100–150 mm roll width), labeling application (manual, auto-flag, or thermal printer label under film), and downstream robotic/gravity outfeed layout.

<h2 id="safety">Safety</h2>

Every coiling and packaging station is designed and validated in compliance with European and international industrial standards:
* **EN ISO 12100:2010**: Comprehensive risk assessment and hazard mitigation methodology for automated motion systems.
* **EN 415-10**: Specific machine safety requirements for packaging machines and modular automated wrapping lines.
* **EN 60204-1**: Safety of machinery—Electrical equipment of industrial machines, low-voltage control architecture, and systematic grounding.
* **ISO 13849-1 (Category 3, Performance Level d)**: Safety circuit integration for perimeter interlocked wire-mesh guarding, pneumatic zero-pressure drop-safety check valves on clamping arbors, and optical category 4 safety light curtains around the coil transfer and rotary ring hazard zones. Rapid emergency-stop (E-stop) trips engage dynamic regenerative motor braking and mechanical spring-applied safety disc brakes on the spindle drive.

<h2 id="engineering-faq">Engineering FAQ</h2>

**Q: Is an inline accumulator strictly required for extrusion lines?**
**A:** Yes. Continuous extrusion lines cannot stop or slow down without creating out-of-spec conductor wall thickness, insulation thermal defects, or cooling trough over-exposure. An accumulator provides the necessary dynamic buffer to absorb continuous production while the coiler performs tail cuts and coil transfers.

**Q: Can we omit the strapping unit and proceed directly to orbital wrapping?**
**A:** For small-diameter, flexible multi-strand cables with minimal residual torsional spring-back, orbital film wrapping alone provides adequate containment. However, for solid-core building wires (e.g., THHN, 1.5–6.0 mm² single core), internal spring-back force can burst unconstrained outer wraps inside shipping containers or shrink heat tunnels. Automated radial strapping is highly recommended for all stiff conductor configurations.

**Q: How does the operator change over coil length and bundle dimensions?**
**A:** The operator selects pre-configured recipes via the multi-language industrial touchscreen HMI. Target cut length, traverse pitch, deceleration advance, and wrapping overlap percentage update automatically via servo positioning. Physical changeover of core ID requires under five minutes utilizing quick-release collapsible arbor assemblies.

**Q: Can this machine wind high-tensile steel wire strands or flexible hose?**
**A:** Yes. Processing high-tensile wire requires specifying our heavy-duty package, which includes hardened tool-steel traversal guides, heavy-duty shear blades, reinforced hydraulic/pneumatic arbor clamping, and closed-loop motor torque profiling to handle higher coil tensile resistance safely.

<h2 id="next-step">Next step</h2>

1. **Submit Your Production Parameters**: Email your cable diameter range, targeted coil dimensions (ID/OD/Height), coil cut lengths, and current extrusion line speeds to **info@fhopepack.com**.
2. **Layout & Cycle Analysis**: Our packaging automation team conducts a complete kinematic cycle-time check and returns a 2D/3D plant footprint layout matching your factory floor.
3. **Engineering Proposal Delivery**: Receive a detailed technical proposal, accumulator capacity calculation sheet, and commercial quotation within 24 hours.

<h2 id="related-reading">Related reading</h2>

- [Automatic cable winding and packing machine (product)](https://www.fhopepack.com/Cable-packing-machine/automatic-cable-winding-and-packing-machine.html)
- [Cable winding and strapping machine (product)](https://www.fhopepack.com/Cable-packing-machine/cable-winding-strapping.html)
- [Cable coil wrapping machine FPCA-200 (product)](https://www.fhopepack.com/Cable-packing-machine/Cable-Coil-Wrapping-Machine-FPCA-200.html)
- [Cable coiling, strapping and shrink packaging machine (video)](https://www.fhopepack.com/videos/automatic-cable-coiling-strapping-and-shrink-packaging-machine/)
- [Wire and cable rewinding and strapping, 24-hour running (video)](https://www.fhopepack.com/videos/wire-cable-rewinding-strapping-machine-real-24-hour-continuous-running/)

<h2 id="sources">Sources</h2>

- FHOPE Engineering Archive: Inline Automatic Cable Coiling & High-Speed Packaging Project Records
- Machine Directives & Harmonized Safety Standards: EN ISO 12100:2010; EN 415-10; EN 60204-1; ISO 13849-1:2015
- Technical Application Guide: Extrusion Line Dynamic Buffer & Traversing Coiler Synchronization

<p><strong>Last reviewed:</strong> 2026-10-20</p>