Pallet Wrapping in Bottling Lines
Pallet wrappers apply stretch film around palletised loads to secure products for transport and storage. They are the final active machine in most bottling lines and must operate reliably to prevent shipping damage. Used pallet wrappers represent excellent value as they are mechanically heavy-duty and have long service lives.
Pallet Wrapper Types
| Type | How It Works | Best For |
|---|---|---|
| Turntable | Pallet rotates on a platform | Low to medium speed, simple operation |
| Rotary arm | Film carriage rotates around stationary pallet | Heavy or unstable loads |
| Ring wrapper | Film carriage travels on a ring around the pallet | High speed, inline integration |
| Orbital wrapper | Wraps around the horizontal axis | Long products, door frames |
Critical Inspection Points
- Film carriage condition — inspect pre-stretch mechanism, film tension control, and film cut-and-clamp system
- Turntable or ring drive — check motor, gearbox, and bearing condition for smooth rotation
- Pre-stretch ratio — verify the machine achieves the specified pre-stretch percentage for film economy
- Control system — evaluate PLC programme completeness and recipe storage for different wrapping patterns
- Top sheet dispenser — if equipped, check top sheet application for consistent coverage
- Conveyor integration — verify pallet in-feed and out-feed conveyors operate reliably
Common Issues
Problems to Watch For
- Film breakage from worn pre-stretch rollers — the most common operational issue
- Inconsistent wrapping tension causing load instability during transport
- Turntable bearing wear causing vibration and noise
- Outdated control systems with limited wrapping programme flexibility
- Film tail not sealing properly due to worn clamp or heat seal mechanism
Frequently asked questions
What pre-stretch ratio should I expect?
Modern pallet wrappers typically achieve 200-300% pre-stretch, meaning the film is stretched to 2-3 times its original length. Higher pre-stretch reduces film consumption but requires good film quality and properly maintained pre-stretch rollers.
How do I choose between turntable and rotary arm wrappers?
Turntable wrappers are simpler and less expensive, suitable for stable loads up to about 30 pallets per hour. Rotary arm wrappers are better for heavy, tall, or unstable loads and can achieve higher speeds. Ring wrappers offer the highest throughput for inline integration.
What maintenance does a pallet wrapper need?
Regular maintenance includes pre-stretch roller cleaning and replacement, film carriage lubrication, turntable bearing inspection, and control system calibration. Film cut-and-clamp mechanisms require periodic adjustment.