Industrial Engineering Guide: Horizontal Orbital Stretch Wrapping for Light Cartons and Paper Products

Executive summary Light cartons and hollow paper cores are particularly vulnerable to compressive deformation, corner crushing, and conveyor skew during automated stretch wrapping. Protecting these products requires precise mechanical tension management, gentle film delivery, and rigid conveying stability. Our horizontal orbital stretch wrappers encase products as they travel continuously through a high-speed rotating ring on motorized roller conveyors. Film tension is precisely calibrated via a mechanical friction brake, while wrap overlap is programmable from 10% to 90% via variable-frequency drives (VFD). Equipment sizing is governed by the product cross-sectional diagonal and structural clearance: the E100 accommodates diagonals from 50 to 100 mm, while the E300 covers 100 to 300 mm.

Table of Contents

How the horizontal wrapper works

The horizontal orbital wrapper secures continuous profiles, long cartons, and bundles inside an automated pass-through tunnel. The packaging cycle operates through a synchronized feed-forward sequence:

  1. Infeed & Alignment: The product moves forward on an independently motorized roller conveyor toward the rotating ring station.
  2. Orbital Ring Carriage: The stretch film dispenser is mounted to a dynamically balanced cast-aluminum or steel ring. As the ring rotates around the linear pass-line, the film unrolls in a true continuous helical spiral around the product.
  3. Optical Product Sensing: A diffuse-reflective photocell system detects the product leading and trailing edges, automatically initiating the orbital cycle and defining the exact points for film clamping and cutting.
  4. Pneumatic Cut & Hold: An automated pneumatic clamping and cold-knife cutting mechanism captures the film tail against the ring frame at cycle completion, leaving the tail primed for the next incoming carton without manual intervention.
[Infeed Conveyor] ---> [Photocell Trigger] ---> [Rotating Ring & Film Spiral] ---> [Pneumatic Cut/Clamp] ---> [Outfeed Conveyor]

By propelling the product through the ring at a constant linear speed, the system ensures uniform packaging tension without requiring human intervention in the hazardous rotational zone.

Powered conveyor passing through the stainless wrapping ring of an E300 horizontal stretch wrapper with film
E300 wrapping station. The motorized pass-through conveyor advances the package through the orbital ring while stretch film wraps in a continuous spiral.

Why light products need care

Wrapping heavy steel bars or timber profiles relies on high film tension to achieve load containment. However, applied to lightweight corrugated cartons, folding paperboard, or lightweight fiber tubes, excessive film hoop tension causes severe structural failure:

  • Corner Crushing: Bending stress concentrates on carton edges, collapsing inner flutes.
  • Conveyor Drift & Yaw: Tangential film pull exceeds bottom frictional traction, rotating the package off the center pass-line.
  • Conveyor Buckling: Film tension pulls the carton backward against the roller feed pitch.

Three key design parameters prevent carton damage:

Setting Operational Rule for Light Cartons Engineering Impact
Film Tension Back off the friction brake / tensioner spring until the film lays flat with minimal neckdown. Eliminates transverse hoop stress; prevents inward crushing of corrugated sidewalls.
Spiral Overlap Target 30%–40% overlap for dust and moisture protection; reserve 50%+ for rigid bundles. Avoids excessive accumulation of film layers that build inward compressive force.
Conveyor Support Keep motorized rollers or top-pressure guides actively engaged immediately adjacent to the ring gap. Prevents the film tangential pull from lifting or pivoting the leading edge off the conveyor.

Both the infeed and outfeed roller conveyors are fully motorized and synchronized. The product is always propelled positive-forward through the wrapping eye rather than being pulled forward by the film web.

Choosing the model by diagonal

A product passes smoothly through an orbital wrapper only when its maximum cross-sectional envelope clears the inner ring diameter. Machine frame selection depends entirely on the cross-sectional diagonal, calculated as √(Width² + Height²), rather than width alone.

Theoretical Diagonal = √(Width² + Height²)

+------------------------------------------+
|            Carton Cross-Section          |
|   +----------------------------------+   |
|   |                                  |   |
|   |                                  | H |
|   |         Diagonal (Hypotenuse)    | e |
|   |        /                         | i |
|   |       /                          | g |
|   |      /                           | h |
|   |     /                            | t |
|   |    /                             |   |
|   |   /                              |   |
|   +----------------------------------+   |
|                  Width                   |
+------------------------------------------+
   Total Required Clearance Ring Inner Bore:
       D_ring ≥ √(Width² + Height²) + C

Note: In real-world integration, an engineering clearance margin (C ≥ 30–50 mm) is mandatory to account for the film reel carriage path, roller clearance, and packaging tolerances.

Product Type & Cross-Section (Example) Net Diagonal Recommended Machine Model
Narrow box / small conduit (e.g., 60 × 60 mm) ~85 mm E100 (50–100 mm envelope)
Medium carton / paperboard pack (e.g., 200 × 150 mm) 250 mm E300 (100–300 mm envelope)

Both equipment series are engineered to process products longer than 1,000 mm. Evaluate your packaging inventory against both the maximum structural diagonal and the minimum payload threshold: 8 kg on the E100 and 15 kg on the E300. “Light” describes structural box density rather than loads below the transport tare threshold. For ultra-light parts below 8 kg, auxiliary pneumatic hold-down devices are necessary to maintain roller traction.

Film width, overlap and ring speed

The forward conveyor speed (V_c) required to produce a specified film overlap (Overlap%) is governed by the film width (W_film) and orbital ring rotational speed (N_ring):

Advance per Ring Turn (Pitch) = W_film × (1 − Overlap%)

Conveyor Speed (V_c) = W_film × (1 − Overlap%) × N_ring

Worked engineering example for the E300, wrapping a carton with 150 mm wide LLDPE film at a 50% target overlap and an orbital ring speed of 90 r/min:

Operational Parameter Engineering Formula / Input Calculated Value
Film Web Width (W_film) Measured spool width 150 mm (0.15 m)
Target Overlap Recipe requirement 50% (0.50)
Linear Advance per Revolution 150 mm × (1 − 0.50) 75 mm / rev (0.075 m/rev)
Ring Rotational Speed (N_ring) VFD frequency setting 90 r/min
Required Conveyor Speed (V_c) 0.075 m/rev × 90 r/min 6.75 m/min
Cycle Wrapping Time (1,200 mm carton) 1.2 m / 6.75 m/min × 60 s ~10.7 seconds

The resulting speed of 6.75 m/min falls comfortably within the E300’s linear wrapping operational envelope of 5–15 m/min. For lighter protection with minimal film consumption, lowering the overlap to 30% increases the advance pitch to 105 mm, allowing the line to run at faster conveyor speeds without over-spinning the orbital ring.

E100 and E300 data

The technical specifications below outline standard engineering boundaries for the series:

Specification Parameter E100 Orbital Wrapper E300 Orbital Wrapper
Product Diagonal Envelope 50–100 mm 100–300 mm
Minimum Product Length > 1,000 mm > 1,000 mm
Allowable Payload Range 8–100 kg 15–100 kg
Ring Rotational Speed 20–120 r/min (VFD controlled) 20–90 r/min (VFD controlled)
Linear Wrapping Speed 3–15 m/min 5–15 m/min
Conveyor Feed Speed 6–12 m/min 6–12 m/min
Conveyor Configuration 2,000 mm Infeed + 2,000 mm Outfeed, Powered 2,000 mm Infeed + 2,000 mm Outfeed, Powered
Stretch Film Roll Width 50–100 mm 100–200 mm
Total Connected Power Approx. 2.5 kW Approx. 2.5 kW

Controls and safety

The control architecture is powered by an industrial PLC with an integrated HMI operator interface, enabling recipe management for varying carton batches:

  • Optical Tracking: Leading-edge and trailing-edge photo-eyes establish precise wrap start, reinforcement rotations, and cut cycles.
  • Diagnostics & Monitoring: Fault alarms, safety interlocks, and emergency stops are displayed directly on the screen.
  • Separate Control Enclosure: The operator station is housed in a standalone IP54 pedestal away from the orbital drive ring.
  • Soft Start/Stop Acceleration: Variable-frequency inverters ramp up ring rotation smoothly, mitigating tension spikes that snap the film or crush delicate carton edges.
  • Machine Safeguards: Protective mesh enclosure surrounds the orbital ring with interlocked maintenance access doors.

For CE-regulated manufacturing plants, our machinery follows ISO 12100:2010 for general machine risk assessment and EN 415-10:2014 for safety requirements across pallet and product packaging machinery.

Selection checklist

Before requesting a formal engineering layout, verify these application variables:

  • Cross-Sectional Geometry: Confirm package width, height, and maximum diagonal √(W² + H²).
  • Length Boundaries: Minimum and maximum product lengths (confirming > 1,000 mm standard transit).
  • Weight Range: Tare weight of lightest unit (must meet 8 kg / 15 kg threshold) and heaviest carton.
  • Structural Strength: Crush sensitivity of corrugated board, fluting integrity, and edge protection needs.
  • Wrapping Purpose: Dust-proof spiral (30% overlap) versus structural bundling wrap (50%+ overlap).
  • Throughput Target: Required units per minute or linear meters per hour.
  • Plant Utilities: Electrical voltage, phase, frequency (e.g., 380V/3P/50Hz), and compressed air feed (0.6 MPa).

Engineering FAQ

Q: How do I wrap light cartons without crushing or creasing the corners? A: Loosen the mechanical friction brake on the film carriage until the film unrolls smoothly without necking down. Additionally, ensure the motorized conveyors are closely spaced at the ring interface, and adjust auxiliary top-hold-down rollers to stabilize the carton without exerting high downward pressure.

Q: Which orbital wrapper model fits my product line? A: Calculate the maximum diagonal: √(Width² + Height²). If the product diagonal remains between 50 and 100 mm, select the E100. If the diagonal spans from 100 to 300 mm, select the E300. Always ensure an extra 30–50 mm margin is preserved for the rotating film carriage.

Q: How do I dial in the film overlap percentage? A: Overlap is controlled by coordinating conveyor line speed and ring rotational speed via the PLC touch screen. The formula is: Conveyor Speed = Film Width × (1 − Overlap%) × Ring RPM. Setting the overlap between 30% and 50% covers most carton protection requirements.

Q: What is the average throughput for long cartons? A: The E300 wraps at linear rates between 5 and 15 m/min. For a standard 1,200 mm carton running at 6.75 m/min with 50% overlap, the wrapping cycle takes approximately 10.7 seconds, excluding transit gap spacing.

Q: How does the machine handle film cutting between successive products? A: Optical sensors register the trailing edge of the package as it clears the ring. A pneumatic clamp captures the film against the frame while an integrated cold utility blade severs the film web cleanly. The clamped tail is instantly positioned for the next incoming package.

Next step

Our packaging integration process moves from engineering review to factory floor commissioning in three structured phases:

  1. Submit Product Matrix & CAD Layout: Email your dimensional range, carton weights, and target line output to info@fhopepack.com.
  2. Receive 48-Hour Technical Proposal: Our engineering team delivers a tailored machine proposal complete with cycle-time simulations and recommended roller pass-line configurations.
  3. Line Integration & Acceptance: Finalize plant space, power drops, and safety perimeter layouts with our project engineers before manufacturing.

Sources

Last reviewed: 2026-10-04

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