Horizontal Orbital Stretch Wrapper for Aluminum Profiles, Timber and Long Products

Executive Summary A horizontal orbital stretch wrapper protects long products—such as extruded aluminum profiles, structural timber, architectural boards, and metal extrusions—by revolving a ring-mounted film carriage around the product as it moves linearly along a conveyor. Because the load advances flat without rotational movement, finished surfaces remain scratch-free. Standard FHOPE E-series wrappers accommodate cross-sectional package outer diameters from 50–100 mm (E100) up to 200–500 mm (E500) at line speeds of 6–12 m/min (3–12 m/min on the E500). High-capacity aluminum profile lines support bundles up to 300 mm H × 450 mm W × 6500 mm L. Sizing requires matching the ring inner diameter to the bundle’s diagonal dimension plus carriage clearance, while verifying seven critical plant integration parameters.

Table of Contents

What a Horizontal Orbital Stretch Wrapper Does

A horizontal orbital stretch wrapper applies stretch film along the full length of extended parts. The workpiece rests on an infeed conveyor and travels horizontally through a rotating circular ring. A film carriage mounted to the ring orbits the advancing part, wrapping film in a continuous, tight spiral from head to tail.

The core kinematic distinction is that the wrapping mechanism revolves while the load remains strictly stationary in its rotational axis. This sets the orbital wrapper apart from other industrial packaging machines:

Machine Type Primary Kinematics Product Motion Ideal Load Profile
Turntable Wrapper Turntable rotates around vertical axis Part rotates 360° on pallet Short, palletized vertical stacks
Rotary Arm Wrapper Suspended arm revolves around pallet Load remains stationary on floor Heavy, tall, or unstable palletized loads
Orbital (Ring) Wrapper Ring-mounted carriage orbits horizontally Load advances linearly through ring center Long products (profiles, timber, pipes, bar stock)

By preventing the workpiece from tumbling or rotating on rollers, orbital wrapping preserves anodized, powder-coated, or finely sanded surfaces that would scuff under friction.

How the Ring Wrap Works

The packaging cycle follows a four-stage electro-pneumatic sequence:

  1. Infeed and In-line Clamping: The bundle moves onto the powered infeed roller conveyor. Overhead pneumatic hold-down rollers descend to clamp the load against conveyor rollers, suppressing shifting or end-lifting.
  2. Carriage Indexing and Film Catch: On fixed-frame units, the workpiece enters the center aperture of the stationary ring. On vertical-lift variants, the entire ring assembly adjusts dynamically to center the aperture on the product’s neutral axis. A pneumatic clamp secures the film tail.
  3. Orbital Spiral Wrapping: Dual driving belts spin the aluminum ring up to operating speed (up to 120 RPM). The carriage draws film through a mechanical or powered pre-stretch roller set. As the conveyor feeds the workpiece forward, film wraps continuously over the product. Ring deceleration and acceleration curves are controlled via Variable Frequency Drives (VFD).
  4. Cut, Clamp, and Discharge: When the load clears the optical sensor, the ring halts. A pneumatic blade cuts the film web, an air-actuated clamp secures the tail for the next cycle, and an end-wiper wipes the film flat before the package transfers to the outfeed conveyor.

Sizing the Ring: Diagonal Clearance and Overlap Mechanics

1. Geometric Ring Sizing Equation

A ring inner diameter (D_ring_ID) must clear the maximum envelope of the bundle. For a rectangular bundle of width W and height H, the bundle’s diagonal is:

D_bundle = √(W² + H²)

However, ring selection cannot match D_bundle directly. The rotating film dispenser carriage, pre-stretch rollers, and film roll project inward into the ring’s radial opening. In addition, vertical pneumatic hold-down rollers and lateral guide rollers operate within the throat area. The true design requirement is:

D_ring_ID ≥ D_bundle + 2 × C_dispenser

Where C_dispenser represents the radial intrusion depth of the film carriage and safety clearance margin (typically 120–200 mm depending on roll capacity). Sizing without this buffer causes the rotating carriage to strike the load or clamping frame.

+---------------------------------------------------------+
|                  ROTATING RING HOUSING                  |
|                                                         |
|             +----[ Film Roll & Carriage ]----+          |
|             |        (Radial Intrusion)      |          |
|             v                                v          |
|     +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+     |
|     |            Effective Clearance Area         |     |
|     |                                             |     |
|     |           +---------------------+           |     |
|     |           |  Workpiece / Bundle |           |     |
|     |           |     Height (H)      |           |     |
|     |           |   x Width (W)       |           |     |
|     |           +---------------------+           |     |
|     |              ^                              |     |
|     |              |--- D_bundle = √(W² + H²)     |     |
|     +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~+     |
|                                                         |
|      D_ring_ID >= √(W² + H²) + 2 x C_dispenser          |
+---------------------------------------------------------+

2. Conveyor Feed Pitch and Overlap Control

Overlap percentage dictates moisture ingress resistance and package rigidity. It is determined by the linear line speed (V_conveyor, in m/min), the ring rotation speed (n_ring, in RPM), and the film width (W_film, in mm):

  • Linear feed pitch per revolution (P, in mm): P = (V_conveyor / n_ring) × 1000
  • Film overlap percentage (Overlap %): Overlap % = [ (W_film - P) / W_film ] × 100%

To prevent packaging gaps, P must be strictly less than W_film. For high-protection packaging (e.g., bare aluminum extrusions requiring water-tight bundling), operators program an overlap of 50% or higher via the PLC touchscreen.

3. Film Roll Dynamics and Core Sizing

Unlike pallet wrappers running standard 76 mm (3-inch) core, 15–20 kg film rolls, orbital wrappers run 50 mm (2-inch) core rolls with outer diameters of 100–200 mm (or 250 mm on larger rigs).

This reduction is governed by centrifugal mechanics:

F_centrifugal = m × (2 × π × n / 60)² × r

Mounting a heavy commercial film roll on an arm rotating at 90–120 RPM subjects the ring structure, bearings, and drive belts to extreme centrifugal stresses. Compact rolls limit rotational inertia, minimize belt fatigue, and allow rapid acceleration/deceleration cycles at batch transitions. Film selection should comply with ASTM D882 tensile testing benchmarks.

Published Reference Figures for the FHOPE E-Series

The following parameters represent standard engineering configurations across the FHOPE horizontal orbital series:

Parameter E100 E200 E300 E400 E500
Package Cross-Section OD 50–100 mm 50–200 mm 100–300 mm 100–400 mm 200–500 mm
Minimum Package Length > 1000 mm > 1000 mm > 1000 mm > 1200 mm > 1500 mm
Rated Load Weight 8–100 kg 8–100 kg 15–100 kg 15–100 kg 50–500 kg
Conveyor Line Speed 6–12 m/min 6–12 m/min 6–12 m/min 6–12 m/min 3–12 m/min
Ring Rotation Speed 20–120 RPM 5–15 m/min* 20–90 RPM 20–90 RPM approx. 10–60 RPM
Wrapping Line Speed 3–15 m/min Custom 5–15 m/min 5–25 m/min Custom
Drive Power Rating ~2.5 kW ~2.5 kW ~2.5 kW ~2.5 kW ~4.5 kW
Pneumatic Supply 0.5–0.8 MPa 0.5–0.8 MPa 0.5–0.8 MPa 0.5–0.8 MPa 0.5–0.8 MPa

*Note: Certain documentation expresses ring speed as tangential linear surface velocity (m/min) across the drive ring circumference rather than rotational speed (RPM). Convert using n = V_tangential / (π × D_track) when calculating film overlap.

Target Applications and Load Profiles

Aluminum Profiles and Architectural Extrusions

Extrusions require uniform compression to stay bundled without bending thin profiles or scratching decorative finishes. Automated lines—such as dedicated aluminum profile packing lines with timber feeding—handle bundles up to 300 mm H × 450 mm W × 6500 mm L. Infeed systems use polyurethane-coated (PU) or nylon rollers to eliminate metal-on-metal contact.

Timber, Wood Molding, and Composite Boards

Finished wood, flooring packs, PVC trim, and composite panels cannot rotate due to their length and flex. Orbital packaging binds individual battens into rigid, transportable packs. For flat panel products, integrated top-and-bottom six-sided wrapping protects edges from moisture penetration and job-site dirt.

Structural Conduit, Plastic Tubing, and Rods

Pipes and non-rigid plastic extrusions tend to splay or sag if unsupported. Horizontal wrappers with synchronized V-shaped powered infeed conveyors center cylindrical bundles directly into the ring’s geometric eye.

Application Boundaries: What Orbital Wrappers Are Not For

Orbital wrapping is not intended for standard cube-shaped, palletized warehouse freight. Loads shorter than 1000 mm require specialized close-roller bridges, while compact, heavy block pallets are wrapped more efficiently on conventional turntable or rotary-arm machines.

Engineering Specification Checklist Before Procurement

Ensure your technical request for quotation (RFQ) defines these seven design parameters:

Engineering Parameter Technical Requirement Design & Operational Impact
1. Dimensional Envelope Min/Max Width, Height, Diagonal, Length Fixes the internal ring diameter (D_ring_ID) and conveyor roller bed width.
2. Max Mass & Center of Gravity Total bundle weight (kg) and weight/meter Determines conveyor drive gear ratio, roller wall thickness, and bed structure.
3. Surface Contact Sensitivity Anodized, painted, mill-finish, raw lumber Dictates roller sleeve materials (PU, vulcanized rubber, or raw galvanized steel).
4. Target Cycle Throughput Linear meters/min or bundle cycle count/hour Sets ring RPM limits, required film carriages (single vs. dual), and cooling specs.
5. Consumable Roll Specs LLDPE thickness (15–35 µm), core ID, roll OD Matches film core chucks (typically 50 mm ID) and pre-stretch ratio (150–250%).
6. Plant Pneumatics & Power Standard 3-phase VAC, 0.6–0.8 MPa air feed Confirms flow rate (NL/min) for cut/clamp cylinders and overhead stabilizers.
7. Line Integration & Layout Standalone manual load vs. upstream line feed Governs infeed roller heights, transfer tables, PLC handshakes, and fieldbus protocol.

Safety Architecture and Control Standards

Horizontal orbital wrappers contain rotating ring assemblies operating at high peripheral speeds. International machine safety regulations mandate strict risk abatement:

  • Harmonized Standards: Machine design and risk assessment must comply with EN ISO 12100:2010 (general safety) and EN 415-6:2013 (safety requirements for horizontal orbital wrapping machines).
  • Functional Safety Systems: Optical safety light curtains at the infeed and outfeed apertures must meet ISO 13849-1 Performance Level d (PL d), Category 3. Interrupted beams immediately halt ring rotation.
  • Perimeter Guarding: Interlocked physical fencing around the ring orbit plane prevents operator access during automatic cycles.
  • Energy Isolation: Padlockable pneumatic shutoff valves and main electrical disconnect switches ensure compliance with OSHA Lockout/Tagout (LOTO) protocols during film reel replenishment.

Engineering FAQ

Q: Does the product rotate during wrapping?

A: No. The workpiece advances linearly on horizontal conveyor rollers. The rotating aluminum ring carries the film roll around the profile, leaving sensitive finishes stable and scratch-free.

Q: How do I size the ring for an irregular bundle?

A: Measure the widest cross-sectional dimension (W) and tallest dimension (H). Calculate D_bundle = √(W² + H²), then add at least 250–350 mm of diametrical clearance. This clearance accommodates the film carriage swing path, pre-stretch rollers, and overhead stabilizer brackets.

Q: Why do orbital wrappers use 50 mm core film instead of standard 76 mm pallet wrap?

A: Orbital wrappers mount the film roll directly onto the spinning ring. Standard pallet rolls (15–20 kg) generate destructive centrifugal forces (F_c = m × ω² × r) at 90–120 RPM, degrading ring balance and drive belt life. Using 50 mm core rolls (OD 100–200 mm, weight under 5 kg) minimizes rotational inertia.

Q: How is film overlap adjusted for weather-tight shipping?

A: Overlap is set via the HMI touchscreen by matching ring speed (RPM) with conveyor linear speed (m/min). Increasing ring RPM relative to conveyor advance reduces linear feed pitch, generating overlaps above 50% for dust and water resistance.

Technical Inquiries and Next Steps

To receive an engineering layout and proposal:

  1. Compile the maximum and minimum bundle cross-sections (W × H × L), weight per meter, and required bundles-per-hour rate.
  2. Specify your product’s finish sensitivity (to select polyurethane, nylon, or standard roller sleeves).
  3. Contact the FHOPE engineering technical support desk to receive a CAD footprint drawing, pneumatic consumption data, and customized cycle-time analysis within 48 hours.

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