Executive Summary Our eye-through (orbital) HDPE pipe coil wrapping machine secures semi-rigid coils weighing 5–100 kg, with outer diameters (OD) of 600–1,400 mm, inner diameters (ID) of 300–1,200 mm, and coil widths of 100–350 mm. Operating at ring speeds from 20 to 120 r/min, it completes a tight wrapping cycle in 12–30 s per coil. Equipment clearance is governed by three dimensional gates culminating in the radial throat constraint:
OD − ID < 800 mm. Overall production cadence, film overlap percentage, and material consumption follow direct kinematic relationships between ring rotational speed, roller surface travel, and film web width.
Why HDPE coils are wrapped through the eye
Semi-rigid high-density polyethylene (HDPE) conduit, drip irrigation piping, and industrial hoses retain high internal bending memory after coiling. Without continuous containment, the outer wraps expand outward, causing telescoping, bundle deformation, or unraveling during transport.
Conventional exterior-only or turntable wrapping fails to immobilize individual rings within the bundle. The orbital wrapping method solves this by passing the film dispenser through the central core (eye) of the vertical coil while motorized base rollers rotate the coil around its central horizontal axis. This eye-through motion applies continuous circumferential tension around the bundle’s radial cross-section, locking every layer into a rigid, self-contained unit resistant to moisture, UV degradation, and transit vibration.
The size gate: OD, ID and OD−ID
To determine whether an HDPE pipe bundle can pass through the orbital ring without collision, plant engineers must verify product dimensions against three sequential mechanical gates:
[Bundle OD: 600–1,400 mm] —> Gate 1: Ring Outer Radius Clearance │ Pass [Bundle ID: 300–1,200 mm] —> Gate 2: Dispenser Carriage Ingress Clearance │ Pass [Radial Wall: OD − ID Gate 3: Structural Throat Depth Clearance
- Gate 1 (Outer Diameter): The bundle OD must fall between 600 mm and 1,400 mm to fit beneath the ring arch and between the side containment rollers.
- Gate 2 (Inner Diameter): The bundle ID must fall between 300 mm and 1,200 mm to allow the orbital ring section and its mounted film carriage to clear the core without scraping.
- Gate 3 (Radial Throat Gate): The difference between OD and ID must satisfy:
OD − ID < 800 mmThis limits the bundle’s single-side radial wall thickness(OD − ID) ÷ 2to under 400 mm.
Clearance calculation examples
- Passing bundle (OD 1,400 mm / ID 700 mm):
OD − ID = 1,400 mm − 700 mm = 700 mmBecause 700 mm < 800 mm, the radial wall thickness is 350 mm. The coil clears Gate 3 and processes smoothly through the standard machine frame. - Interfering bundle (OD 1,300 mm / ID 400 mm):
OD − ID = 1,300 mm − 400 mm = 900 mmAlthough both OD (1,300 mm) and ID (400 mm) satisfy Gates 1 and 2 individually,OD − ID = 900 mm, which exceeds the 800 mm structural throat gate. The 450 mm radial wall thickness causes physical interference with the orbital carriage path. Processing this coil requires an oversized ring frame.
Ring speed and cycle time
Total cycle time per coil is determined by pure wrapping time plus mechanical handling:
Total cycle time (t) = (Ring turns × 60 ÷ Ring speed) + Handling time
Where:
- Ring turns = Number of complete orbital revolutions around the bundle.
- Ring speed = Rotational velocity of the ring (stepless inverter control from 20 to 120 r/min).
- Handling time = Time to load, clamp, cut film, and discharge (typically manual or semi-automated on standalone units).
Engineering worked example
Consider a pipe coil with an OD of 800 mm, requiring 6 turns for basic spot-binding or light containment:
- Set ring speed: 60 r/min (1.0 r/s).
- Pure wrapping time:
(6 turns × 60 s/min) ÷ 60 r/min = 6.0 s. - With standard coil indexing and infeed/outfeed positioning, the entire cycle completes within the machine’s baseline rating of 12–30 s per coil.
Why the 120 r/min ceiling outperforms heavier machines
The standard HDPE pipe coil packing machine utilizes a solid, precision-machined cast-aluminum orbital ring driven by high-friction polyurethane wheels, enabling rapid acceleration up to 120 r/min.
In contrast, heavy-duty wrappers such as the Hose coil wrapping machinery FPH-400 are engineered for wider cross-sections (150–400 mm width, 10–100 kg mass, OD 700–1,500 mm). The FPH-400 operates at a fixed maximum speed of 100 r/min with a 1.5 kW motor, yielding a complete wrapping cycle of 30–55 s per coil. The lightweight, high-speed ring design on the standard HDPE machine allows higher angular velocity for light-to-medium coils (5–100 kg), reducing per-unit cycle time by up to 45%.
Overlap from film width and feed
Overlap percentage is directly controlled by the ratio between ring rotational speed and support roller linear surface advance:
Overlap ratio = 1 − (Feed advance per turn ÷ Film width)
Rearranging the formula allows the packaging engineer to calculate the required roller advance per ring turn:
Feed advance per turn = Film width × (1 − Overlap ratio)
The standard dispenser supports film web widths of 100 mm and 120 mm. The table below details linear advance per revolution for target overlap configurations:
| Nominal Film Width | Target Overlap Ratio | Linear Feed Advance per Turn | Effective Layer Pitch |
|---|---|---|---|
| 100 mm | 30% | 100 mm × (1 − 0.30) = 70 mm |
High-speed dust protection |
| 100 mm | 50% | 100 mm × (1 − 0.50) = 50 mm |
Standard 2-ply perimeter seal |
| 120 mm | 30% | 120 mm × (1 − 0.30) = 84 mm |
Maximum surface coverage speed |
| 120 mm | 50% | 120 mm × (1 − 0.50) = 60 mm |
Heavy-duty moisture barrier |
Engineering Note: During operation, film neck-in occurs due to mechanical brake tension, reducing effective web width by 5% to 15%. This parameter is compensated via variable frequency drive (VFD) indexing adjustments on the support rollers.
Film choice for PE and PVC
The dispenser carriage supports dual-material wrapping depending on logistical and storage environments:
- LLDPE Stretch Film:
- Standard specification: Core ID 50 mm, Roll OD 100–200 mm, Web width 100–120 mm.
- Characteristics: High elastic memory, self-cling surface without adhesive residue, excellent moisture sealing, and 100% recyclability alongside the parent HDPE pipe material.
- PVC Stretch Film:
- Standard specification: Core ID 50 mm, Roll OD 100–200 mm, Web width 100–120 mm.
- Characteristics: High optical clarity, superior puncture resistance over sharp pipe cutoff burrs, and high tack for low-temperature operating environments.
- Alternative Materials: The carriage also processes woven HDPE knit belt and compound crepe paper for heavy-duty scuff resistance during flatbed export shipping.
Roller support and coil sag
Flexible coils (such as small-diameter drip tape or SDR 17 thin-wall irrigation pipe) can experience bottom flattening or axial sag when resting on bare rollers.
To counteract gravitational deflection and dynamic eccentricity during wrapping:
- Polyurethane Support Rollers: Two motorized bottom rollers provide non-marking, high-traction rotation. Polyurethane dampens machine vibration and prevents localized crimping of outer pipe walls.
- Adjustable Lateral Restraints: Telescoping vertical side-guide rollers support the coil face, preventing narrow bundles (100–150 mm width) from tipping axially during high-speed ring rotation.
- Centerline Preservation: Restraint rollers ensure that the inner aperture stays centered along the orbital ring axis, preventing the film roll carriage from colliding with the pipe ID.
When to move to a full line
While the standalone HDPE pipe wrapper operates at 12–30 s per coil, manual staging and bundle transfer limit overall department output. When facility throughput exceeds 25 coils per hour, upgrading to an integrated line becomes cost-effective:
| Parameter | Standalone Wrapper | Integrated Hose Coil Packaging Line |
|---|---|---|
| Typical Coil Capacity | 5–100 kg | 8–50 kg |
| Coil OD Range | 600–1,400 mm | 500–650 mm |
| Coil ID Range | 300–1,200 mm | 350–400 mm |
| Package Width | 100–350 mm | 150–250 mm |
| Wrapping Cycle | 12–30 s/coil | 20–40 s/coil |
| System Throughput | Operator dependent (~15–20 coils/h) | ~30 coils/h (Continuous automated run) |
| Automation Level | Manual load/unload; semi-auto cycle | Automatic strapping, wrapping, stacking, and outfeed |
| Utilities | 2.0 kW, 380V, 50 Hz, 3-Phase | 380V, 50 Hz, 3-Phase; Pneumatic supply: 6–8 kgf/cm² |
For higher automation requirements, review our comprehensive Pipe packing machines overview to assess line layouts.
Guarding and utilities
Standard factory installations conform to safety and electrical mandates:
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Safety Standards: Engineered in accordance with ISO 12100:2010 (Risk assessment and risk reduction) and EN 415-10:2014 (Safety of packaging machines).
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Electrical Specification: 380 V, 50 Hz, 3-Phase, with a total connected load of approximately 2.0 kW. Control circuitry runs on 24 V DC via an IP54-rated cabinet. Emergency stop buttons and interlocked service doors are standard.
Selection checklist
Ensure the following parameters are fully defined before finalizing equipment specifications:
- Complete dimensional matrix: Minimum and maximum OD, ID, width, and bundle weight.
- Throat Gate verification: Confirm
OD − ID < 800 mmfor all contemplated product codes. - Line speed requirement: Target output per hour vs. the machine’s 12–30 s wrapping cycle.
- Material specification: Stretch film type (LLDPE vs. PVC), web width (100 mm or 120 mm), and core diameter (50 mm).
- Overlap target: Select between 10% and 90% overlap based on storage and weather exposure needs.
- Upstream coiler transfer: Determine if infeed is manual or paired directly with an upstream automated extrusion coiler.
Engineering FAQ
Q: What happens if an HDPE coil satisfies the OD limit but fails the OD − ID < 800 mm constraint?
A: If OD − ID ≥ 800 mm, the coil’s radial wall thickness exceeds 400 mm. Even if the outer diameter fits under the machine frame, the inner diameter is too small relative to the outer boundary, causing the film carriage to collide with the bundle wall during ring rotation. An oversized ring chassis is required for such profiles.
Q: Can this machine wrap both 100 mm and 120 mm film widths? A: Yes. The modular film carriage spindle accommodates material widths of 100–120 mm, with core internal diameters of 50 mm and external roll diameters between 100 mm and 200 mm.
Q: How does this machine achieve a cycle time of 12–30 s compared to 30–55 s on the FPH-400W? A: The standard wrapper features a lightweight, balanced cast-aluminum ring capable of rotational speeds up to 120 r/min. The heavier FPH-400W machine uses a reinforced frame for wider, bulkier coils (up to 400 mm width) with ring speeds capped at 100 r/min, resulting in longer indexing cycles.
Q: What electrical utilities are required on site? A: The standard installation operates on 380 V, 50 Hz, 3-Phase industrial power, drawing approximately 2.0 kW connected load. Alternate factory electrical specifications (e.g., 220 V, 460 V, 60 Hz) can be accommodated upon request.
Next step
We validate orbital packaging envelopes and calculate exact film usage for your production lines within 24–48 hours:
- Send your coil data: Email minimum and maximum OD, ID, width, unit mass, and target line output to info@fhopepack.com.
- Receive engineering validation: Our design team will verify the three dimensional clearance gates, provide drive ratio calculations, and deliver a cycle-time report.
- Integration review: We align conveyor pass-line heights and PLC interlocking with your upstream extrusion coiler.
Last reviewed: 2026-11-05
