Plastic Pipe Coil Wrapping Machine: Operation, Film Calculation, and Engineering Selection

Executive summary Plastic pipe coils are orbital-wrapped through the eye so that stretch film covers the inside diameter (ID), outside diameter (OD), and both side faces under controlled tension. Our orbital coil wrapping machine demonstrated in this test run packages rigid and semi-rigid plastic coils (PEX, PE-RT, HDPE, and PVC): the operator initiates the sequence at the freestanding control console, the rotating orbital ring drives film through the eye, and polyurethane support rollers rotate the coil along its horizontal axis. The net film applied per coil is determined strictly by the coil cross-sectional perimeter, overlap percentage at the OD, and total orbital passes. We configure ring gear ratios and variable-frequency drives (VFD) per client production target.

Table of Contents

What the video shows

The video demonstrates factory acceptance testing (FAT) of our orbital pipe coil wrapping unit processing a coiled polymer pipe bundle:

  1. Initial Coil Positioning & Clamping: The operator positions the banded pipe coil vertically between the motorized polyurethane-coated support rollers, verifying coil alignment relative to the orbital ring center line.
  2. Cycle Initiation: From the standalone HMI control console positioned outside the perimeter safety fence, the operator activates the automatic wrapping cycle.
  3. Orbital Ring Descent & Engagement: The vertical carriage lowers the rotating ring frame into wrapping position, passing the film roll assembly directly through the internal eye (ID) of the coil.
  4. Synchronized Multi-Axis Wrapping: The base rollers index the coil around its horizontal core while the ring rotates at steady rotational velocity, distributing linear stretch film symmetrically over the entire cross-section.
  5. Safe Inspection Protocols: The operator monitors cycle progress exclusively from the control station behind the yellow perimeter guard rail. Per factory standard operating procedures (SOP), physical verification of film tension and mechanical inspection are executed solely after the ring reaches a verified zero-speed state.

How the pipe coil wrapper works

The wrapping sequence coordinates two independent motion vectors: the orbital rotation of the ring (shuttle movement through the coil eye) and the peripheral drive of the support rollers turning the coil.

Step Mechanism Action
Load Heavy-duty PU support rollers The strapped pipe coil is loaded onto dual base rollers via overhead hoist, boom arm, or infeed conveyor.
Start Master console / dual push-buttons The operator verifies clearance, sets wrapping parameters, and initiates the automated cycle from the cabinet.
Wrap Orbital ring drive + roller drive The ring feeds pre-stretched film continuously through the inner core while rollers index the bundle forward.
Finish Pneumatic cut & clamp (or manual tail tuck) The film web completes the specified wrap count, the cycle decelerates to zero, and the film tail is secured against the OD.
Unload Roller discharge / ejector ramp The fully encapsulated, weather-tight coil is lifted or rolled off to palletizing stations.

The orbital ring speed and support roller speed are electronically synchronized via variable-frequency drives. This guarantees that each wrap overlaps the preceding pass by a constant pitch.

Film laid per coil

Each orbital pass deposits one continuous loop of stretch film across the combined perimeter of the coil wall (radial thickness plus axial width).

Worked Engineering Example

The following dataset demonstrates film requirement for a standard industrial pipe bundle:

Parameter Formula / Input Illustrative Value
Coil Outer Diameter (OD) Direct measurement 1,000 mm
Coil Inner Diameter (ID) Direct measurement 600 mm
Coil Axial Width (W) Direct measurement 300 mm
Radial Wall Height (H) (OD − ID) ÷ 2 = (1,000 − 600) ÷ 2 200 mm
Cross-Section Perimeter (Loop Length) 2 × (W + H) = 2 × (300 + 200) 1,000 mm (1.0 m)
Film Web Width Nominal supply width 100 mm
Target Overlap Ratio at OD Programmed overlap target 50%
Effective Linear Advance per Pass at OD Web Width × (1 − Overlap) = 100 × (1 − 0.50) 50 mm
OD Circumference π × OD = 3.1416 × 1,000 3,142 mm
Orbital Passes Required OD Circumference ÷ Advance = 3,142 ÷ 50 63 passes
Total Film Laid on Coil 63 passes × 1.0 m Loop Length 63 linear meters

Kinematic Consideration: OD vs. ID Overlap Dynamics

Because the inner diameter circumference (π × 600 mm = 1,885 mm) is smaller than the outer circumference (3,142 mm), an advance of 50 mm per pass achieves a 50% overlap at the outer face, while the overlap automatically tightens to approximately 70% to 75% at the inner eye. This geometric characteristic provides enhanced structural rigidity along the interior core.

Note on Film Consumption: The calculated 63 meters represents applied film on the product. If your wrapping carriage utilizes a powered pre-stretch mechanism operating at 150% to 200% stretch ratio, actual payout from the primary film roll is reduced accordingly (Actual Payout = Applied Film ÷ [1 + Pre-stretch Ratio]).

For advanced multi-layer and high-speed tube coil lines, refer to our tube and pipe coil packing machine; to integrate coiling, strapping, and film wrapping within a continuous extrusion downstream line, review our automatic pipe coiling and wrapping machine.

Cabinet buttons and speed settings

The standalone electrical cabinet separates line voltage drives from 24 V DC operator controls:

Control Element Engineering Function Operational Impact
Cycle Start / Stop Buttons Dual-hand or shielded push-buttons Initiates automated cycle; controlled ramp-down on stop.
Emergency Stop (E-Stop) Category 0 / Category 1 mushroom button Hardwired to safety relay; cuts actuator power instantly.
Multi-Color Tower Light Visual status indication Green = running; Amber = cycle end / standby; Red = fault or safety trip.
Ring Speed Potentiometer / VFD Controls orbital ring motor (RPM) Dictates cycle cycle velocity and hourly throughput.
Roller Speed Potentiometer / VFD Controls support roller drive (RPM) Calibrates linear coil advance to maintain 30% to 70% film overlap.
Film Tension Brake Adjuster Mechanical friction or magnetic powder brake Regulates stretch tension (typical 80–180 N) to prevent coil distortion.

The fixed perimeter safety barrier ensures the operator remains at the cabinet side during high-speed rotation, preventing entanglement hazards.

Controls and safety

During operation, the internal carriage ring revolves at 40 to 100 RPM through the coil eye while heavy support rollers turn the payload. Hands-off operation is mandatory once the cycle begins. Adjusting tape tails, clearing film tears, or servicing mechanical components is strictly restricted to machines in complete, locked-out stoppage.

Standards and Regulatory Compliance

Machine safety integration depends on regional installation standards:

  • CE Directives (European Union): Risk mitigation compliant with EN ISO 12100:2010. Specific packaging machine design parameters adhere to EN 415-10:2014 (General safety requirements for packaging machines).
  • Control Architecture: Safety circuits, emergency circuits, and interlocked gate switches conform to ISO 13849-1 Performance Level d (PLd) Category 3.
  • North American Installations (OSHA / ANSI): Electrical control cabinets are configured to NFPA 79, with physical interlocking conforming to ANSI/PMMI B155.1 and Lockout/Tagout (LOTO) protocols conforming to OSHA 29 CFR 1910.147.

Selection checklist for a pipe coil wrapping machine

Before selecting a ring diameter and base roller configuration, evaluate these project parameters:

  • Pipe Material & Wall Thickness: PEX, PE-RT, HDPE, corrugated PP, or PVC (affects minimum eye rigidity under film tension).
  • Coil Dimensional Envelope: Minimum and maximum Outer Diameter (OD), minimum Inner Diameter (ID), and maximum Axial Width (W).
  • Coil Weight Range: Minimum and maximum weight (kg) to specify support roller bearing ratings and motor kW.
  • Throughput Target: Target cycle time and coils per hour (determines ring gear drive vs. friction wheel drive).
  • Film Packaging Specification: PE stretch film, woven plastic tape, VCI anti-corrosion film, or paper tape; nominal roll width (100–150 mm).
  • Overlap Requirement: Standard dust-proofing (30–50%) or moisture-tight weather encapsulation (50–70%).
  • Handling Configuration: Standalone manual crane loading vs. fully automated infeed/outfeed motorized roller integration.
  • Utility Infrastructure: Available facility voltage (e.g., 380 V 50 Hz 3-phase / 480 V 60 Hz 3-phase) and factory compressed air supply (0.5–0.7 MPa).

Engineering FAQ

Q: How does the film cover the internal diameter (ID) of the pipe coil? A: The wrapping ring features an internal circular passage aligned with the coil core. A film dispensing carriage mounted on the rotating ring carries the film roll continuously through the open eye, wrapping the cross-section 360 degrees.

Q: How much film does a standard 1,000 mm OD coil consume per cycle? A: As demonstrated in our worked example (1,000 mm OD × 600 mm ID × 300 mm width), a single pass at 50% overlap requires approximately 63 orbital revolutions, laying roughly 63 linear meters of film around the coil perimeter.

Q: Does 63 linear meters on the coil equal 63 meters paid out from the roll? A: No. When using a pre-stretch film carriage, mechanical or motorized pre-stretch elongates the film (e.g., 100% to 200%) prior to deposition, reducing primary roll consumption significantly compared to net applied meters.

Q: Can coil deformation occur when wrapping lightweight or small-diameter corrugated tubing? A: Yes. If film tension exceeds the structural rebound strength of the coil bundle, the core can collapse. Our systems incorporate adjustable magnetic or friction brake tensioners to maintain gentle, uniform stretch (down to 40 N) for delicate coils.

Q: Should the operator steady the coil during the wrapping cycle? A: Never. The coil must be securely banded and seated on the dual polyurethane support rollers before startup. Once the cycle start command is given, the operator must remain outside the yellow guard barrier until rotation stops completely.

Next step

To size an orbital pipe coil wrapping system for your extrusion or rewinding line, proceed with our 3-step engineering consultation:

  1. Submit Product Specs & Layout: Send your pipe bundle dimensions (min/max OD, ID, width, weight) and target line speed to info@fhopepack.com.
  2. Receive Engineering Proposal within 48 Hours: Our mechanical team will return an equipment proposal including ring diameter calculation, cycle time simulation, and film consumption report.
  3. Layout Review & Factory Acceptance Planning: Confirm floor space constraints, infeed/outfeed roller heights, and arrange physical testing with your actual pipe coil samples.

Sources

Last reviewed: 2026-10-04

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