Resumen ejecutivo Our S200 rod wrapping machine spirals stretch film round single bars, rods and small bundles as they pass through a turning ring. Motor-driven conveyors feed the rod in and carry it out, and a board centres rods of different diameter in the ring. It takes rods 10 to 200 mm across and 10 to 100 kg. A worked example sets the overlap at full ring speed and checks which rods are too heavy.
Índice
- Why wrap rods one by one
- How the rod passes through the ring
- Centring rods of different diameter
- Especificaciones S200
- Worked example: overlap, time and weight for a 100 mm rod
- Lista de selección: qué enviarnos
- Seguridad y EN 415-10
- Preguntas frecuentes sobre ingeniería
- El próximo paso
- Lectura relacionada
- Fuentes
Why wrap rods one by one
Finished rods and bars scratch and pick up dirt when they rub together in a bundle or on a rack. A tight spiral of stretch film on each rod keeps the surface clean and dry until it is used.
Wrapping by hand is slow on long pieces and leaves loose ends. Our S200 lays the film at a set overlap along the whole length, at conveyor speed.
How the rod passes through the ring
- Entrada. The rod lies on the motor-driven entrance conveyor and moves towards the ring.
- Start. A photocell detects the rod and sets the wrapping position automatically.
- Envoltura. The ring turns round the rod as the conveyor carries it through. Film tension is set by a brake device.
- Press and exit. Press rollers at the exit keep the wrapped rod steady on the outlet conveyor.
- Finalizar. The operator cuts the film. An automatic cutter is available as an option.
The S200 runs on its own or connected to a production line for automatic operation.
Centring rods of different diameter
A thin rod and a thick rod sit at different heights on a flat conveyor. If the rod is off centre in the ring, the film wraps tighter on one side.
The S200 has a board that moves up and down to centre each diameter in the ring. The operator sets it with a hand wheel when the rod size changes. Double rings and double drive wheels keep the ring turning smoothly and steadily.
Especificaciones S200
| Parámetro | S200 |
|---|---|
| Longitud del producto | Más de 300 mm |
| Diámetro del producto | 10 – 200 mm |
| Peso del producto | 10-100 kg |
| Cinta transportadora de entrada | 2,000 mm, motor driven |
| Cinta transportadora de salida | 2,000 mm, motor driven |
| Velocidad de transporte | 4-12 m/min |
| Velocidad del anillo | 20–120 r/min, by converter |
| Film estirable | LLDPE, 120–200 mm wide, roll OD 150–200 mm, core 50 mm |
| Potencia | aproximadamente 2.1 kW, CA 380 V, 60 Hz |
| Opciones | other packing materials; conveyor length; automatic cutter |
Worked example: overlap, time and weight for a 100 mm rod
Take aluminium rods 100 mm in diameter and 3,000 mm long, wrapped with 150 mm film. These are illustrative customer figures.
De peso. The rod volume is π × 0.05² × 3 = 0.0236 m³. In aluminium at 2,700 kg/m³ it weighs about 64 kg, inside the 100 kg limit. The same rod in steel at 7,850 kg/m³ would weigh about 185 kg, too heavy for the S200.
Overlap at full ring speed. Each ring turn, the rod advances 150 × (1 − overlap). At 120 r/min the conveyor must not exceed 12 m/min. So the overlap must be at least 1 − 12,000 ÷ (120 × 150) = 33%.
| superposición | Avance por turno | Velocidad de la cinta transportadora a 120 r/min |
|---|---|---|
| 40% | 90 mm | 10.8 m/min |
| 50% | 75 mm | 9.0 m/min |
| 60% | 60 mm | 7.2 m/min |
Overlap at low ring speed. The conveyor cannot run below 4 m/min, so the ring must turn fast enough to keep the overlap. At 20 r/min the rod would advance 4,000 ÷ 20 = 200 mm per turn, more than the 150 mm film, leaving gaps. For 50% overlap the ring needs at least 4,000 ÷ 75 = 53.3 r/min. We set ring speed and conveyor speed together on the converter.
Tiempo At 50% overlap the 3 m rod passes in 3 ÷ 9 min, or 20 s of wrapping. That is 3,000 ÷ 75 = 40 turns.
Película. Each turn covers π × 0.1 = 0.314 m round the rod. The film also runs 75 mm along it, so one turn uses √(0.314² + 0.075²) = 0.323 m. Forty turns lay about 12.9 m of film on the rod, before pre-stretch.
Lista de selección: qué enviarnos
- Rod or bar diameter range.
- Rango de longitud.
- Material and weight per piece.
- Surface finish that must stay unmarked.
- Piezas por hora.
- Suministro eléctrico en el lugar.
Seguridad y EN 415-10
We design the S200 to EN 415-10 for packaging machines, with an ISO 12100 risk assessment. The turning ring, the conveyors and the press rollers are the main hazards. Guardrails cover the moving parts for safe operation. When a fault occurs, the indicator light alarms and shows the fault.
Preguntas frecuentes sobre ingeniería
Q: Can it wrap small bundles as well as single rods? A: Yes, within 200 mm across and 100 kg.
Q: Can it run in a production line? A: Yes. The S200 can be connected to the line for automatic operation.
Q: Can it use paper or other materials? A: Different packing materials are an option.
P: ¿Qué normas de seguridad se aplican? R: En los mercados CE, la norma EN 415-10 para la máquina y la norma ISO 12100 para la evaluación de riesgos.
El próximo paso
- Email your rod diameters, lengths and weights a info@fhopepack.com.
- Le responderemos en un plazo de 24 horas con una propuesta., with the film width and conveyor lengths.
- Enviamos un plano de distribución. de la envolvedora y las cintas transportadoras.
Lectura relacionada
- Semiauto horizontal orbital wrapper S200
- Envolvedora automática de barras
- Envoltura de material de varilla de aluminio
- Envolvedora de láminas de cobre y barras de bronce
Fuentes
- Specifications: FHOPE semiauto horizontal orbital wrapper S200 product page
- Video de la máquina: rod wrapping machine on YouTube
- Weight, overlap and film: our worked example, illustrative rod figures
- Normas: EN 415-10 (máquinas de envasado, seguridad general); ISO 12100:2010
Última revisión: 17/10/2026
