Executive summary The inline automatic turntable pallet stretch wrapper secures column-stacked bottled beverage pallets directly from powered roller conveyors without manual intervention. A powered pre-stretch carriage isolates film tension from the pallet surface, preventing top-heavy, shrink-wrapped bottle packs from tilting or sliding. Containment overlap is governed strictly by turntable rotational speed and vertical carriage velocity: at 12 rpm and 2.9 m/min, the film carriage advances 242 mm per pallet revolution, delivering an engineered 52% nominal overlap on 500 mm stretch film.
Why bottle pallets are different
In automated beverage packaging halls, this wrapping system is installed inline with plant transport conveyors to handle tall, unstable pallets of shrink-bundled bottles or cans. Pallets feed automatically from the production line onto the integrated roller turntable. Once the wrap cycle finishes, the motorized turntable conveyor indexes the secured load directly to the outfeed transport line.
Automatic turntable stretch wrapper. The integrated roller turntable interfaces directly with plant infeed and outfeed conveyors.
Palletized bottle bundles present specific containment challenges:
- Low inter-layer friction: Shrink-wrapped packs sit directly on plastic bottle caps, creating point-contact surfaces prone to lateral slippage.
- High center of gravity: Tall, column-stacked pallets are sensitive to horizontal inertia and non-uniform film pull.
- Load shifting under tension: High film tension applied directly to corners can distort the perimeter packs.
To resolve this, the wrapper isolates film elongation via a motorized pre-stretch carriage, ensuring constant containment force across the full stack height while locking the bottom layer securely to the wooden pallet base. Frequency-inverter-driven soft start and soft stop control eliminates centrifugal shock during turntable acceleration and deceleration.
Specifications
| Technical Parameter | Specification / Metric |
|---|---|
| Throughput capacity | Minimum 24 loads/hour |
| Maximum load capacity | 1,800 kg |
| Turntable platform | Ø 2,200 mm, max. 12 rpm (VFD adjustable), chain-driven powered roller bed |
| Motion profile | Variable-frequency soft acceleration and deceleration |
| Stretch film specification | LLDPE, 500 mm width, 0.025 mm (25 µm) thickness |
| Pre-stretch ratio | 250% standard fixed gear ratio (100%–300% optional) |
| Carriage vertical speed | 2.9 m/min (inverter controlled) |
| Wrap program parameters | Bottom, middle, top layers: 0–99 programmable wraps |
| Height detection | Optical photocell sensor (auto-tracking pallet crest) |
Overlap from turntable speed and carriage speed
During the spiral wrap cycle, the vertical pitch of the film carriage relative to turntable rotation determines the overlap percentage. The kinematic calculation at nominal operational speed is detailed below:
- Cycle time per revolution: At maximum speed of 12 rpm, one full rotation requires:
60 s ÷ 12 rpm = 5.0 s/rev - Carriage vertical rise per revolution: At a carriage hoist speed of 2.9 m/min (48.3 mm/s), the vertical travel per turntable turn equals:
48.3 mm/s × 5.0 s = 241.7 mm (≈ 242 mm) - Nominal film overlap: With standard 500 mm film, each turn overlaps the preceding layer by:
500 mm − 242 mm = 258 mm (nominal 51.6% ≈ 52% overlap)
When turntable speed is reduced while keeping carriage lift speed constant at 2.9 m/min, vertical travel per turn increases and overlap drops:
- At an illustrative 8 rpm, one turntable turn takes 7.5 s.
- Carriage rise per turn expands to
48.3 mm/s × 7.5 s = 362.5 mm. - Nominal overlap drops to
500 mm − 362.5 mm = 137.5 mm (≈ 27.5% overlap).
Vertical Carriage Pitch (mm/rev) = [Carriage Speed (m/min) × 1000] ÷ [Turntable Speed (rpm) × 60]
Nominal Overlap (mm) = Film Width (mm) − Vertical Carriage Pitch (mm/rev)Note on film neckdown: Under a 250% pre-stretch ratio, LLDPE film undergoes transverse narrowing (neckdown) of approximately 15% to 20% before reaching the load face. Effective film width is typically 400–425 mm rather than nominal 500 mm. Operating parameters should always be validated on trial pallets via the HMI to guarantee target wrap containment.
Wind pattern for bottle packs
The PLC program provides independent layer parameter configuration (0–99 winds) across three primary zones:
- Bottom reinforcement winds: Extra winds bind the lower tier of bottle packs to the pallet deck, preventing lateral shifting across conveyor transfers or road transport.
- Middle spiral traverse: Uniform overlap maintains continuous compressive force across the load column without crushing outer bottles.
- Top reinforcement winds: Concentrated wraps bind the loose uppermost layer, preventing pack displacement caused by air turbulence or forklift braking.
The powered pre-stretch carriage relies on dual motor-driven rubber rollers running at different peripheral speeds, controlled by an electronic feedback dancer bar. This provides consistent, low-tension film release onto the pallet perimeter, making it safe for delicate beverage containers that conventional friction-brake carriages would tip over.
Film handling for unmanned running
The machine features a fully automatic pneumatic film clamp, cut, and wipe mechanism to support continuous, operator-free operation:
- Pneumatic clamping: A heavy-duty scissor clamp mechanism grips and holds the film tail ready for the next incoming load.
- Thermal impulse cutting: A heated resistance cutting wire cleanly separates the film web upon cycle completion.
- Tail wipe-down: A trailing pneumatic brush and soft wipe arm press the film tail firmly against the pallet wrap to prevent unraveling during conveying.
Optical sensors verify film integrity and tail adherence at each cycle stage. Operator duties are limited solely to master roll replenishment.
Utilities and safety
| Supply / Utility | Engineering Requirement |
|---|---|
| Electrical connection | AC 380 V ± 10%, 3-phase, 50 Hz (or local 460 V / 480 V, 60 Hz options) |
| Drive motors | Turntable drive: 0.75 kW; Roller bed drive: 0.75 kW; Carriage lift: 0.37 kW; Pre-stretch drive: 0.37 kW |
| Pneumatic supply | 0.6–0.8 MPa (6–8 bar / 6–8 kgf/cm²), filtered and dry air |
| Control architecture | Siemens or Omron PLC platform, color touchscreen HMI, dedicated pre-stretch control board |
Machine safety architecture complies with relevant international directives:
- Emergency stop circuit: Dual-channel Category 4 / PLe safety relay with mushroom-head E-stop pushbuttons.
- Power isolation: Main lockable electrical isolator (OSHA LOTO compliant).
- Compliance standards: Risk assessment follows ISO 12100:2010, baseline packaging machinery safeguards meet EN 415-10:2014, and pallet-wrapping functional safety complies with EN 415-6:2013.
Selection checklist for bottle pallets
When specifying an inline turntable wrapper for beverage lines, confirm the following technical data:
- Load footprint: Pallet dimensions (L × W × H), total pallet weight, and maximum height variation.
- Pack configuration: Shrink-film multi-packs, loose tray packs, or corrugated cases.
- Throughput target: Required pallets per hour (pph) from the upstream shrink bundler or palletizer.
- Containment recipe: Desired overlap percentage, film gauge (µm), and baseline top/bottom wind counts.
- Conveyor integration: Infeed/outfeed conveyor roller center distance, roller diameter, pass-line height, and PLC handshake protocols (EtherNet/IP, Profinet, dry contacts).
- Utility availability: Plant electrical supply voltage and clean compressed air hookups.
Frequently asked questions
Q: Why must nominal overlap calculations be verified on a trial pallet?
A: Mathematical calculations assume the nominal 500 mm film roll width. Because elastic recovery and transverse neckdown reduce actual film width by 15%–20% under 250% pre-stretch, effective overlap on the pallet face is slightly less than calculated. A trial run verifies the real-world containment profile.
Q: How does the system prevent unstable shrink-wrapped bottle packs from toppling?
A: Stability is maintained through two synchronized systems: VFD soft start/stop on the turntable to minimize rotational inertia, and an active powered pre-stretch carriage with dancer-arm feedback that delivers film at near-zero tension relative to the pallet face.
Q: Can overlap settings be modified for different pallet heights?
A: Yes. Turntable rotation speed, carriage vertical velocity, and top/bottom wind counts are recipe-selectable on the HMI touchscreen, allowing operators to match wrap programs to different beverage SKU heights instantly.
Next step
We engineer automatic turntable wrapping solutions to match your exact bottling line requirements:
- Send your line layout, pallet dimensions, pack type, and hourly throughput targets to info@fhopepack.com.
- Receive a customized technical proposal within 48 hours, including integration layout drawings, roller conveyor specifications, and wrap cycle simulations.
- Coordinate an engineering review to confirm line integration, communication handshakes, and on-site footprint constraints.
Related reading
- Automatic pallet wrapping machine B100
- Video: turntable pallet wrapper for the beverage industry
- Video: pallet wrapping machine with conveyors
- Video: turntable pallet wrapping machine and top sheet covering
- Video: pallet stretch wrapping machine A200
Sources
- Technical specifications, pre-stretch ratios, and film clamping mechanics: B100 automatic inline series documentation
- Visual validation: Beverage industry pallet wrapping test sequences on YouTube
- Machine compliance standards: ISO 12100:2010, EN 415-10:2014, EN 415-6:2013
Last reviewed: 2026-10-24
