When a load must not rotate during wrapping, two automatic solutions should be compared: the rotary arm stretch wrapper and the rotary ring stretch wrapper. In both systems, the pallet remains stationary while the film application unit travels around the product.
Choosing between them means looking beyond pallets per hour. Ease of maintenance, stops to change film, wrapping quality and space for working on the equipment also affect day-to-day performance. The right machine should keep pace with production and be practical to operate and maintain.
Two ways to wrap a pallet without rotating it
In an automatic rotary arm stretch wrapper, a motorised arm rotates around the load while the film carriage distributes film at the programmed height.
In an automatic rotary ring stretch wrapper, the ring carrying the film application system rotates around the pallet and moves to complete the wrapping pattern.
Both technologies avoid exposing the load to the acceleration of a turntable. They can therefore be considered for tall, heavy or deformable pallets, or loads with low cohesion between layers.
Differences between ring and rotary arm stretch wrappers
| Criterion | Rotary arm | Ring |
|---|---|---|
| Load movement | The pallet remains stationary | The pallet remains stationary |
| Rotating element | Arm carrying the film carriage | Ring carrying the application system |
| Output of the Robotec configuration | Up to 80 pallets/hour | Up to 100 pallets/hour |
| Maintenance | Its architecture can make interventions easier; check access and components | Check assembly guidance, rotation and lifting; Robotec’s design reduces wear components |
| Operating profile | Lines where its cycle meets demand with capacity to spare | Lines requiring greater wrapping capacity |
| Load stability | Wraps without rotating the product | Wraps without rotating the product |
| Available pre-stretch | Up to 300% | Up to 300% |
| Top protection | Optional top-sheet applicator | Optional top-sheet applicator |
| Installation layout | Check the arm’s swept area and access | Check the ring’s space requirements and access |
These capacities refer to Robotec Packing’s current configurations. Actual output depends on more than the machine’s maximum speed: pallet height, number of wraps, programmed reinforcements, load infeed and outfeed, and equipment upstream and downstream of the wrapper also play a part.
Maintenance: which is easier to maintain?
A rotary arm is often a good starting point when mechanical simplicity is the priority. In many designs, the arm and film carriage assembly makes inspection points easy to identify and access. This can simplify preventive maintenance, provided the installation leaves enough space for access.
On a ring wrapper, inspection should cover the assembly’s guidance, rotation and lifting as well as the film application system. The number of components subject to wear depends on how those movements and power transmission are implemented.
A general comparison should therefore not be applied to every model. Robotec’s ring uses a design that eliminates sliding contacts, transmission belts and onboard batteries, as specified in its technical configuration. This simplification should also be considered when comparing maintenance with a rotary arm.
To compare two proposals, request the maintenance schedule and check:
- Which components need cleaning, inspection, adjustment or replacement, and how often.
- How long it takes to access the film carriage, pre-stretch rollers and clamping and cutting system.
- Which spare parts should be kept on site and their supply lead times.
- Which tasks the maintenance team can perform and which require specialist assistance.
The useful measure is how many hours of maintenance and downtime the equipment needs for the planned workload. Maintenance intervals expressed in cycles should be assessed alongside shifts and production volume.
Output and continuity: compare the complete cycle
Robotec’s rotary arm reaches up to 80 pallets per hour and the ring up to 100 pallets per hour. Both are industrial solutions; the ring’s capacity advantage becomes valuable when wrapping could limit the line’s output.
Compare the same pallet format with an equivalent wrapping pattern. A tall load or a programme with more reinforcement requires a different cycle from a low load with fewer wraps. Positioning, film finishing and pallet outfeed times must also be included.
Continuity also depends on stops. Review how the roll is changed, how long the operator takes to replenish the film and how the cycle is recovered after a film break. Higher nominal capacity alone does not guarantee more finished pallets at the end of the shift.
Wrapping quality and film consumption
Both solutions can work with film pre-stretch of up to 300%. Actual consumption depends on load geometry, the number of wraps and reinforcements, containment force and film properties. It would therefore be incorrect to claim that one technology always uses less film than the other.
Trials should compare grams of film per pallet alongside the stability achieved. Material savings are useful only if the load retains the restraint needed during handling and transport. For deformable products, also check that film tension does not damage packaging or displace layers.
Both configurations support an optional top-sheet applicator. If the top of the load needs protection, include this accessory and its operating sequence when calculating the actual cycle.
Space, safety and ease of operation
The layout must account for the arm’s or ring’s travel, the maximum pallet format and conveyor connections. It must also leave room to open access points, remove a roll and carry out maintenance with the equipment stopped.
Safety is assessed across the complete installation: guarding, controlled access and the stopping procedure for interventions. Keeping the pallet stationary does not remove the need to guard the machine’s moving area.
For the operator, consider the roll-changing position, the film threading path and how easily programmes can be selected or faults identified. These details affect every shift, even though they do not appear in the pallets-per-hour figure.
Investment and operating costs
The purchase price is one part of the decision. The cost comparison should include integration, film, energy, spare parts, maintenance hours and production time lost to stops.
If the arm meets demand with capacity to spare, it can be a solution suited to the plant’s needs. If the line needs more capacity, the ring may justify the investment by preventing wrapping from limiting production. That calculation requires quotations and actual operating data; neither technology is always the cheaper option.
When to choose each technology
Consider a rotary arm when:
- Its cycle time meets current production and expected growth.
- A straightforward architecture with good maintenance access is a priority.
- The required formats and programmes can be handled without approaching the capacity limit.
Consider a ring when:
- The line needs higher output or headroom to absorb production peaks.
- It runs for extended shifts and wrapping could become a bottleneck.
- Cycle time savings have a measurable effect on overall production.
For heavy, tall or unstable loads, both options offer the advantage of keeping the pallet stationary. The choice should be based on trials with the actual load and the installation’s conditions.
What information engineering needs to decide
Before selecting a technology, gather:
- Load dimensions, weight, height and stability.
- Current and target output, and expected growth.
- Operating hours and production shifts.
- Wrapping pattern, required protection and film used.
- Connected equipment, available space and maintenance areas.
- Maintenance resources, available spare parts and acceptable downtime.
This information makes it possible to calculate the actual cycle, check the available capacity margin and define the machine integration within the end-of-line system.
Frequently asked questions
Does a ring wrapper rotate the pallet?
No. The pallet remains stationary while the ring and application system distribute film around the load.
Which is easier to maintain: a ring or rotary arm wrapper?
The arm is often favourable because of its mechanical simplicity, but the specific designs must be compared. Robotec's ring also reduces wear components. Access, scheduled tasks, spare parts and intervention times help determine which will be more practical to maintain in each plant.
Which system is better for an unstable load?
Both avoid rotating the load. The decision depends mainly on output, wrapping pattern, operating intensity and integration with the rest of the line.
At what output should a ring wrapper be installed?
There is no universal threshold. Calculate the actual cycle time and retain capacity above the production target. In Robotec's range, the arm reaches up to 80 pallets per hour and the ring up to 100.
Which wrapper uses less film?
It depends on the load, pattern and film control. Both configurations allow up to 300% pre-stretch, so consumption should be compared using the actual wrapping programme.
Choose for the plant’s daily workload
The best wrapper combines enough capacity, effective load restraint and maintenance the plant can manage. The arm deserves consideration when simplicity is a priority and its cycle meets demand; the ring, when greater capacity adds value to the end-of-line system.
Robotec Packing designs and integrates both technologies within automatic pallet wrapping lines. Send us your formats, weights, required output, film pattern and working shifts so our team can compare the cycle, maintenance access and integration of each alternative. Contact our engineering team.