Περίληψη
A rotate arm stretch wrapper, also called a rotary arm stretch wrapper, hangs the arm from a gantry over the conveyor and orbits the stationary pallet with film. Containment is built in layers: how many layers cover each point of the load depends on the arm speed and the carriage speed. Our equivalent solution runs the arm at 15–18 rpm with a 2.9 m/min carriage, for loads up to 1,200 × 1,200 × 2,000 mm and 35 pallets an hour. Below we work out the film layers, match wrap patterns to the load and size the conveyor buffer.
A pallet of cartons comes in on a two-strand chain conveyor and stops under a cream-coloured gantry. The arm turns overhead from a central hub, and the film carriage on its vertical mast circles the stack while the carriage climbs.
A film roll for the top sheet sits across the top of the inner frame, above the load. A photo eye at conveyor level checks the pallet position, and the finished pallet runs on to the out-feed conveyor while the next one waits.
Πίνακας περιεχομένων
- Why a gantry arm on a conveyor line
- Rotate arm data
- How many film layers the load gets
- Adding a top sheet on the gantry
- Wrap patterns for different loads
- Matching the line rate and the buffer
- Λίστα ελέγχου επιλογής
- Ασφάλεια
- Συχνές ερωτήσεις μηχανικής
- Επόμενο βήμα
- Σχετική ανάγνωση
- Πηγές
Why a gantry arm on a conveyor line
With the arm on a gantry, nothing stands on the floor beside the conveyor, so the pallet runs straight through the wrapping position. The load does not turn, which suits tall carton stacks and light goods that would lean on a turntable. The conveyor stays at one height from in-feed to out-feed, and the arm speed is not limited by the load’s weight.
Rotate arm data
| Είδος | Automatic rotary arm wrapper |
|---|---|
| Φορτία ανά ώρα | έως 35 παλέτες |
| Arm rotation speed | 15–18 rpm, variable through inverter |
| Μέγιστο μέγεθος φορτίου | Μ 1,200 × Π 1,200 × Υ 2,000 mm |
| Ταινία | LLDPE, 500 mm wide, 76 mm core, roll about 15 kg |
| Film force | variable, by separate motor |
| Ταχύτητα μεταφοράς φιλμ | 2.9 m / λεπτό |
| Πρόγραμμα περιτύλιξης | bottom, middle and top winds, each 0–99; reinforcement at chosen positions |
| Αυτοματοποίηση | film feeding, wrapping, film clamping and cutting, wiping and conveying |
| Έλεγχοι | PLC, photo eye height sensor, re-wrap, overwrap and overlap adjustment |
| Δύναμη και αέρας | 380 V, 3 phase, 50/60 Hz; 6–8 kgf/cm² clean, dry air |
| Βάρος μηχανής | about 500 kg for the arm machine; a gantry frame and top sheet unit add weight, confirmed at quote |
| Προέκταση | powered, up to 250% on our R200; other ratios made to order |
How many film layers the load gets
During each turn of the arm, the carriage climbs a vertical pitch equal to carriage speed × turn time. Each point on the side of the load is then covered by about film width ÷ pitch layers on the way up.
| Ταχύτητα βραχίονα | Χρόνος στροφής | Pitch at 48 mm/s | Overlap of 500 mm film | Layers on the way up |
|---|---|---|---|---|
| 15 rpm | 60 ÷ 15 = 4.0 s | 48 × 4.0 ≈ 190 mm | 500 − 190 = 310 mm, ≈ 62% | 500 ÷ 190 ≈ 2.6 |
| 18 rpm | 60 ÷ 18 ≈ 3.3 s | 48 × 3.3 ≈ 160 mm | 500 − 160 = 340 mm, ≈ 68% | 500 ÷ 160 ≈ 3.1 |
The 48 mm/s comes from 2,900 mm ÷ 60 s. An up-and-down cycle doubles the layer count, so a typical load leaves with five or six layers of film on its sides. The film narrows under tension, so the real overlap is a little lower; the overlap adjustment fine-tunes it per program.
Adding a top sheet on the gantry
The gantry also carries the top sheet unit. The sheet is laid over the load before the top winds, and the side film then holds its edges down, so the pallet is covered on five sides against dust and moisture. The sheet adds its own time to the cycle. Cycle time = conveying in + wrap + sheet + cut + conveying out, and each part is timed on the program for your load and confirmed at quote.
Wrap patterns for different loads
| Φορτίο | πρότυπο | Γιατί |
|---|---|---|
| Uniform carton stack | standard up-and-down, 2–3 bottom winds | layers are even, the base winds tie load to pallet |
| Light or unstable stack | lower film force, extra top winds | holds the top without crushing it |
| Heavy base, light top | reinforcement at the bottom and middle | the weight sits low, the shear forces are at the base |
| Mixed stack with an overhang | reinforcement at the step | the step is where the load parts in transport |
The bottom winds matter most: the film must reach down over the pallet deck boards, otherwise the load can slide off the pallet as one wrapped block. The re-wrap function adds a second pass on loads that need it without a new cycle.
Matching the line rate and the buffer
35 pallets an hour is one pallet every 3,600 ÷ 35 ≈ 103 s. Compare it with the time between pallets from your line:
| Line delivers one pallet every | Wrapper needs | Αποτέλεσμα |
|---|---|---|
| 120 s (example) | ≈ 103 δευτ. | wrapper keeps up, 17 s spare per pallet |
| 90 s (example) | ≈ 103 δευτ. | pallets queue; a faster program or a second wrapper is needed |
The film roll change stops the wrapper while the line keeps running. Buffer positions = roll change time ÷ line interval. With an example 5-minute change and a pallet every 120 s, that is 300 ÷ 120 = 2.5, so three accumulation positions on the in-feed conveyor. Your roll change time and line interval decide the real number, confirmed at quote.
Λίστα ελέγχου επιλογής
- Largest and smallest load size and height.
- Line interval between pallets.
- Load type: uniform, light, heavy base or mixed.
- Conveyor type, height and in-feed space for a buffer.
- Ceiling height for the gantry.
- Power and compressed air on site.
Ασφάλεια
We design to EN 415-6 for pallet wrapping machines, with EN ISO 12100:2010 for risk assessment and EN 60204-1 for the electrical equipment. The arm turns at up to 18 rpm overhead, so the wrapping zone is closed by perimeter fencing with interlocked doors.
Muting light curtains at the conveyor openings let pallets pass while stopping the machine if a person enters. The red mushroom emergency stop and the lockable disconnect are on the panel. Guarding and CE documents are agreed per project.
Συχνές ερωτήσεις μηχανικής
Q: Does the arm limit the load weight? A: No, the load stands on the conveyor and the arm does not carry it.
Q: How tall can the load be? A: Up to 2,000 mm.
Q: How many pallets an hour? A: Up to 35, depending on the height and the wrap program.
Q: Is the film cut automatically? A: Yes, film clamping, cutting and wiping are automatic.
Q: Can the overlap be changed? A: Yes, the overlap and the winds are set per program.
Επόμενο βήμα
- Send your load sizes, line interval and layout στο info@fhopepack.com.
- Ορίσαμε the wrap patterns and size the buffer conveyor.
- Απαντάμε εντός 24 ωρών με πρόταση και προσφορά.
Σχετική ανάγνωση
- Rotary arm stretch wrapper RAS200 (product)
- Περιστροφική μηχανή περιτύλιξης παλέτας βραχίονα
- Περιστροφικό περιτύλιγμα παλέτας βραχίονα με επάνω διανομέα φιλμ
- Μηχάνημα τεντώματος διπλού περιστροφικού βραχίονα
- FHOPE R100 rotary arm pallet wrapper with film cutter
- Πλήρως αυτόματη γραμμή μηχανημάτων περιτύλιξης παλετών
Πηγές
- FHOPE quotation: automatic rotary arm pallet wrapper, 2022-03-30
- FHOPE product page: semi-automatic rotary arm stretch wrapper R200 (pre-stretch)
- EN 415-6; EN ISO 12100:2010; EN 60204-1
Τελευταία αξιολόγηση: 19-10-2026
