When it comes to pallet wrapping, one of the most important factors influencing efficiency, film usage, and load stability is the type of stretch system used. The stretch system controls how the film is applied and how much it is stretched during the wrapping process.
Understanding these systems can help businesses reduce waste, improve safety, and choose equipment that best suits their operational needs. Below is an overview of the three main types of stretch systems commonly found in pallet wrappers.
1. Mechanical Brake Stretch
How it works:
A mechanical brake applies resistance to the film roll. As the turntable rotates, the film is pulled and stretched.
Stretch ratio: Around 0–50%.
Advantages:
- Low cost of entry – mechanical brake systems are the cheapest option, making them attractive for small businesses or those just starting out.
- Simple operation – no complex electronics or motors, so they can be run by any operator with minimal training.
- Durable and reliable – fewer moving parts means less chance of breakdowns.
Limitations:
- Higher film consumption – since the stretch is limited, more film is used per pallet, which drives up long-term costs.
- Inconsistent film tension – difficult to guarantee the same load stability every time, which could be a concern for fragile or high-value goods.
- Not suitable for unstable loads – lighter or awkwardly stacked pallets may collapse because the brake cannot apply tension evenly.
- Labour intensive – because of less control, operators often need to intervene more to ensure the load is secure.
Best suited for:
Low-volume operations wrapping fewer than 10 pallets a day, or where budgets are limited and wrapping needs are not complex.
2. Power Pre-Stretch Rollers
How it works:
A powered roller works alongside a passive roller, connected by a belt. As the rollers turn at different speeds, the film is stretched as it passes between them.
Stretch ratio: Typically 250–300%.
Advantages:
- Significant material savings – up to 50% less film used compared to mechanical brakes, reducing both costs and plastic waste.
- Consistent performance – the motorised system applies uniform stretch and tension, improving load containment and reducing product damage in transit.
- Greater film compatibility – works well with modern high-performance stretch films designed for maximum elongation.
- Faster wrapping cycles – more efficient application reduces the time per pallet, which is important in busier warehouses.
Limitations:
- Higher upfront investment – the machinery costs more than mechanical brake systems, so the return on investment depends on usage volume.
- Requires power supply and maintenance – while relatively low, these machines need servicing of belts and rollers to maintain performance.
- Less flexibility – although efficient, they may not provide the same fine-tuned control as dual-motor systems when dealing with mixed load types.
Best suited for:
Medium to high-volume operations wrapping 15 or more pallets daily, where reducing film usage and improving speed are priorities.
3. Powered Variable Stretch (Dual-Motor System)
How it works:
This system uses two independent motors, one for each roller. The roller speeds can be adjusted, allowing operators to control the stretch ratio depending on the load type.
Stretch ratio: Up to 300–600%, depending on the film.
Advantages:
- Maximum flexibility and control – operators can adjust film tension for fragile products, irregular pallet sizes, or heavy-duty loads.
- Exceptional cost efficiency – by stretching film up to six times its original length, it delivers the greatest savings in film consumption.
- Improved load safety – the ability to tailor tension reduces the risk of crushing lightweight goods or failing to secure heavy ones.
- Adaptable to different films – makes it easy to test and use various stretch films, including those designed for sustainability.
- Ideal for automation – these systems are well suited to fully automated operations, reducing reliance on manual labour.
Limitations:
- High capital cost – the most expensive type of stretch system, making it a longer-term investment.
- Complexity – more advanced technology means operators may need training, and specialist engineers may be required for servicing.
- Over-specification risk – smaller businesses may not fully benefit from this system if their wrapping volumes are modest.
Best suited for:
High-throughput, 24/7 operations where efficiency, film savings, and reliability are critical to profitability.
Comparing the Three Systems
| Stretch System | Stretch Ratio | Key Strengths | Key Drawbacks | Best For |
|---|---|---|---|---|
| Mechanical Brake | 30–60% | Low cost, simple, minimal maintenance | High film use, poor for unstable loads | Low-volume, <10 pallets/day |
| Power Pre-Stretch Rollers | 250–300% | Consistent wrapping, 50% film savings | Higher cost than brake, less flexible | 15+ pallets/day, medium–high use |
| Powered Variable (Dual) | 300–600% | Maximum efficiency, flexible control | High cost, more complex to operate | High-throughput, heavy-duty ops |
Final Thoughts
The choice of stretch system has a direct impact on film costs, operational speed, and load stability. Mechanical brake systems may suit smaller businesses looking for simplicity, while power pre-stretch or dual-motor systems provide better efficiency for larger operations.
By weighing up the pros and cons, businesses can make informed decisions that reduce costs, improve sustainability, and ensure products arrive securely at their destination.