Horizontal Orbital Wrapping Machine for Steel Tube Bundles: Specs and Cycle Time

Executive summary We engineer horizontal orbital wrapping systems that helical-wrap stretch film around stationary steel tube bundles as they convey through a rotating ring. Because the tube bundle moves linearly without revolving, bundle strapping stays intact and mill-finished surfaces are protected from scuffing. Our pipe orbital wrapper accommodates 2000–8000 mm tube lengths, 300–2000 mm bundle cross-section envelopes, and 100–5000 kg payloads. Line wrapping speeds range from 2–12 m/min with programmable 20–90% overlap. This technical guide outlines the machine cycle, mechanical specifications, envelope sizing logic, and mathematical wrap-time calculations for production lines.

Table of Contents

• Wrapping process
• Specifications
• Bundle sizing
• Wrap time
• Packing material
• Line integration
• Safety
• Selection checklist
• Engineering FAQ
• Next step
• Related reading
• Sources

How a steel tube bundle is orbital wrapped, step by step

Our horizontal orbital wrapping machine is engineered specifically for heavy industrial steel tube bundles. The process below follows a pre-strapped hexagonal bundle of round carbon steel tubes through an automated cycle:

1. Step 1: Infeed transfer and stability verification. The bundle transfers directly from upstream strapping automation onto the heavy-duty powered infeed roller conveyor. Strapping retains the structural profile so that the wrapper receives a unified, rigid load.
2. Step 2: Recipe selection and HMI parameter pairing. Ring rotation speed (r/min) and conveyor linear travel speed (m/min) are synchronized at the master HMI touch panel. Their ratio establishes the precise spiral overlap percentage across the bundle.
3. Step 3: Dynamic centering and ring throat guidance. Adjustable side-guide rollers close symmetrically along the bundle flanks. This aligns the central axis of the bundle precisely with the orbital ring center, preventing load deflection during entry.
4. Step 4: Continuous horizontal orbital wrapping. The main drive ring rotates around the advancing bundle. The tubes translate forward on heavy-duty rollers without axial rotation, preventing shift or friction scuffing between individual pipes. An automatic mechanical/pneumatic film draw-back tension carriage continuously stabilizes film payout regardless of bundle corner transitions.
5. Step 5: Pneumatic cut-and-clamp and outfeed discharge. As the bundle tail clears the wrapping plane, an automated pneumatic clamp-and-cut unit severs the film web and holds the leading tail for the next cycle. The sealed bundle travels smoothly along the powered outfeed conveyor, fully enveloped against transit wear.

This “ring-revolves, bundle-translates” principle is vital for steel packaging. Rotating a 5000 kg, 8-meter bundle axially would introduce severe centrifugal hazards and destabilize nested tube layers.

Steel tube orbital wrapper specifications

Standard mechanical and electrical parameters for our horizontal orbital pipe wrapping equipment:

Bundle sizing: measure across the corners

Because the internal aperture of the orbital ring forms a clearance circle, sizing must be calculated from the maximum circumscribed diameter across the sharpest bundle corners:

• Hexagonal bundles: Maximum outer diameter OD_bundle = Across-flats (S) × 2 ÷ √3 ≈ 1.1547 × S. A bundle measuring 500 mm across flats requires an envelope of at least 578 mm.
• Square and rectangular bundles: Calculate the diagonal using Diagonal = √(Width² + Height²). A 400 × 400 mm square profile equals a 566 mm diagonal clearance.
• Clearance envelope verification: The calculated maximum diagonal must sit securely within the 300–2000 mm design window, allowing at least 150–200 mm radial operating clearance for the rotating film carriage.
• Short bundle constraints: Bundles shorter than 2000 mm must safely bridge the center gap between infeed and outfeed roller conveyors without drop-off.

Wrap time and throughput per bundle

Cycle wrapping time is governed by three kinematic relationships:

1. Linear pitch per revolution: Pitch (m) = Film Width (m) × (1 − Overlap %) Example: A 500 mm (0.5 m) film roll at 50% overlap provides a linear pitch of 0.5 × (1 − 0.50) = 0.25 m (250 mm) per ring turn.
2. Conveyor travel speed: Travel Speed (m/min) = Ring RPM × Pitch (m) Example: At 40 r/min and a 0.25 m pitch, linear line speed equals 40 × 0.25 = 10 m/min, running comfortably within the machine’s 2–12 m/min operational band.
3. Core bundle wrap duration: Wrap Time (s) = [Bundle Length (m) ÷ Travel Speed (m/min)] × 60 Example: A 6000 mm (6 m) bundle at 10 m/min finishes helical body wrapping in (6 ÷ 10) × 60 = 36 seconds.

Operational limits:

• Maximum throughput rate: Wrapping an 8000 mm bundle at the 12 m/min maximum speed takes only 40 seconds. At a 60 r/min ring velocity, this produces a 200 mm pitch (60% film overlap).
• Heavy export protection: A 90% overlap yields a dense 50 mm pitch. At 40 r/min, linear travel reduces to 2 m/min, requiring 180 seconds to wrap a 6000 mm bundle.

Total line cycle time: Add 10–15 seconds for secondary reinforcement head/tail wraps, pneumatic film cutting, and roller transfer indexing to establish total line takt time.

Packing material for steel tubes: film, knit belt or VCI paper

Our wrapper accepts three primary protective packaging media, configured according to handling severity and logistics routes:

• LLDPE stretch film: Provides dust-proofing, moisture resistance, and tight bundle containment for flatbed road transit and covered warehouse storage. A 50% overlap applies two full waterproof film plies across the bundle circumference.
• VCI (Vapor Corrosion Inhibitor) paper: Actively inhibits rust and oxidation on unpainted, bright-finished, or cold-drawn carbon steel exposed to maritime shipping and salt mist. The ring carries both VCI paper and PE stretch film on twin material dispensers, applying VCI internally with outer waterproof film sealing in a single machine pass.
• Polyethylene knit belt (woven fabric): Delivers superior tear strength and abrasion shielding against abrasive contact from chain rigging, wire ropes, or rough handling at container yards.

Tinted or high-visibility colored films (such as the industrial blue film shown on our system) allow fast visual coding of tube alloys, wall grades, or production batches in storage yards.

Line integration and layout with a tube mill

Our wrapping stations integrate downstream from cooling beds, sizing tables, and automatic bundling stations:

• Pre-wrapping strapping position: Orbital film wrappers are designed for surface sealing and weatherproofing. Steel tube bundles must be strapped with steel or high-tensile PET banding upstream to lock bundle rigidity before entering the ring.
• Conveyor length planning: Both the infeed and outfeed powered roller conveyors must each match or exceed the maximum single bundle length (up to 8000 mm) to guarantee stable center-of-gravity transfer.
• Offline wrapping cell configuration: For mills running diverse small batches, an offline packaging cell served by overhead cranes or forklifts handles secondary wrapping without interrupting primary mill rolling lines.

Safety around a horizontal orbital wrapper

High-speed orbital rings and powered roller beds carry inherent mechanical pinch-point and rotating inertia risks. Standard safety architecture includes:

• Full perimeter interlocked wire-mesh safety fencing around the orbital ring rotation zone, cutting drive power immediately upon gate breach.
• Isolated operator control consoles placed outside the guarded perimeter to prevent personnel entry during automatic cycles.
• Integrated Category 4 / PL e safety circuits, emergency stop e-stop pushbuttons, and compliance with OSHA 1910 LOTO (Lockout/Tagout) standards.
• Personal protective equipment (puncture-proof leather gloves and metatarsal steel-toed footwear) mandatory when handling sharp, deburred pipe ends.

Equipment conforms strictly to regional machinery directives, adopting ISO 12100:2010 for holistic risk assessment and EN 415-10 packaging machinery safety requirements across CE jurisdictions.

Selection checklist for a steel tube wrapping machine

To size your orbital wrapping system accurately, prepare the following engineering inputs:

• Tube profiles: Outside diameter (OD), wall thickness, bundle shape (hexagonal, square, rectangular, round).
• Envelope limits: Maximum across-corners diagonal (mm), minimum bundle length, and maximum bundle weight (kg).
• Mill line speed: Target bundles per hour and preferred line layout (inline automated feed vs. offline loading).
• Material combination: PE stretch film, anti-rust VCI paper, or woven knit mesh; required overlap percentage.
• Plant utilities: Local line voltage, frequency, and compressed air supply capacity (standard 0.6–0.8 MPa).
• Layout boundaries: Available floor footprint for infeed and outfeed conveyors (each at least equal to maximum bundle length).

Engineering FAQ

Q: Does the steel tube bundle rotate during the wrapping process? A: No. The bundle moves purely on a horizontal linear axis at 2–12 m/min while the wrapper ring rotates around it at 20–60 r/min. Keeping the bundle non-rotational maintains strap tension and prevents tube shifting or superficial coating damage.

Q: What is the maximum tube bundle size this orbital wrapper can accommodate? A: The standard equipment envelope accepts pipe bundle lengths from 2000 mm to 8000 mm, cross-sectional ODs from 300 mm to 2000 mm, and gross loads up to 5000 kg. Custom frames are available for extended 12000 mm structural pipe lengths.

Q: How is total cycle time per bundle calculated? A: Wrap duration equals bundle length divided by conveyor linear speed. A standard 6000 mm bundle wrapping at 10 m/min (achieved at 40 r/min with 50% overlap) requires 36 seconds of pure wrapping. Including end reinforcement wraps, cutting, and conveyor index time, total floor-to-floor cycle time runs under 60 seconds.

Q: Can the wrapper apply VCI anti-corrosion paper simultaneously with stretch film? A: Yes. Dual-carriage orbital rings mount two separate rolls simultaneously. The machine dispenses VCI paper directly onto the steel surface as an inner rust-inhibiting layer while concurrently applying PE stretch film on top with a 50% or higher overlap to seal against moisture ingress in one single cycle.

Q: What film overlap percentage is recommended for marine export shipments? A: We recommend a minimum of 50% overlap for covered domestic transit (providing a continuous two-ply film barrier). For open ocean transit or prolonged quayside storage, overlap should be increased to 70–90%, or combined with inner VCI paper wrapping.

Next step

We engineer custom pipe and tube packaging solutions tailored to your mill layout in three simple milestones:

1. Submit your packaging data: Forward your tube dimensions, bundle shapes, bundle weight range, and target hourly output to info@fhopepack.com.
2. Receive an engineering proposal within 48 hours: Our engineering team will supply a customized equipment drawing, ring clearance calculation, conveyor layout, and cycle-time validation.
3. Schedule an engineering consultation: Coordinate an on-site or digital plant review to integrate the orbital wrapper smoothly downstream of your strapping equipment.

Related reading

• Pipe horizontal orbital wrapping machine
• Automatic steel tube packing line
• Video: economic horizontal orbital stretch wrapper for pipe and tube
• Video: automatic horizontal orbital wrapping machine for pipes and bundles
• Video: steel tube bundle packing line
• Video: how to set packing tension on an orbital stretch wrapper

Sources

• Technical specifications, envelope sizing, drive power, and tension controls: Pipe horizontal orbital wrapping machine technical database
• Machine operational cycle and wrapping mechanics: Fhopepack steel tube bundle orbital wrapping demonstration
• Industrial equipment safety standards: ISO 12100:2010 Safety of Machinery; EN 415-10:2014 Safety of Packaging Machines

Last reviewed: 2026-10-03