Envolvedor de braço em filme stretch com dispensador de folha superior

Sumário executivo A rotary arm stretch wrapper keeps the pallet stationary on the conveyor while rotating the film carriage around the perimeter, preventing centrifugal deflection on tall, light, or unstable loads such as shrink-wrapped bottled water. An integrated overhead top-sheet applicator dispenses and cuts a protective cover over the top surface before the rotary arm locks down the edges with overlap wrapping. The Fhopepack RAS100 delivers 10–30 paletes por hora at an adjustable arm speed of 10–14 rpm, supported by a heavy-duty powered roller conveyor accommodating unit loads up to 4,000 kg.

Conteúdo

Quando escolher um braço rotativo

On a conventional turntable wrapper, the pallet rotates on a powered disc. On a rotary arm wrapper, the load remains entirely motionless while an overhead balanced structural arm rotates the film roll around it.

Keeping the pallet static eliminates centrifugal forces, making this architecture essential for three distinct operational challenges:

  • Unstable, high-aspect-ratio stacks: Palletized bottled water, empty containers, and beverage cans exhibit low internal friction between layers. Any angular acceleration or centrifugal force during turntable rotation risks layer shifting or catastrophic tipping.
  • Ultra-light packages: Cardboard packaging or partially filled containers lack the mass required to resist high film pre-stretch forces during rapid rotation.
  • Paletes ultra-pesadas ou irregulares: Moving 2,000–4,000 kg loads on a rotating base creates high mechanical wear on turntable slewing rings and drive motors. A stationary in-line conveyor easily handles structural weights up to 4 t without dynamic rotational strain.

In typical high-output beverage lines, palletized bottled water enters directly from the palletizer onto the wrapping conveyor. The RAS100 integrates an overhead film-dispensing module that lays a water-resistant poly cover across the load prior to orbital containment wrapping.

Envolvedora rotativa de filme stretch RAS100 com esteira de rolos de entrada e saída.
Envolvedora de filme stretch com braço rotativo RAS100. The pallet remains stationary on the powered roller conveyor while the overhead arm orbits the unit load.

A folha superior e a sequência de envolvimento

The automated wrapping and top-sheet placement follows a sequenced cycle controlled by the PLC:

  1. Infeed transfer: The powered roller conveyor moves the pallet into the wrapping zone, centering it directly beneath the rotary arm.
  2. Posicionamento do lençol superior: The overhead top-sheet mechanism descends toward the top surface of the stack, pulls a continuous sheet of polyethylene film to the programmed length, and performs a mechanical blade cut.
  3. Pneumatic stabilization: The top-sheet applicator retracts to its home position, and a pneumatic top stabilizer plate presses down onto the load (typically 200–500 N adjustable downward force) to secure light layers.
  4. Primary containment wrap: The rotary arm accelerates to its set speed. As the carriage reaches the top elevation, the stretch film overlaps the top-sheet overhang by 100–150 mm, locking the moisture barrier securely against the four vertical corners.
  5. Secondary downward wrap: The film carriage travels down to the pallet base at the preset conveyor overlap height, applying reinforcement wraps across the wooden/plastic pallet footings.
  6. Cut and seal release: A pneumatic clamp grips the film web, an impulse hot-wire cutter separates the tail, and a pneumatic brush mechanism smooths the trailing edge onto the load. The top stabilizer plate lifts, and the sealed pallet exits to the discharge conveyor.

This dual-layer envelope creates a five-sided, dust-proof, and splash-resistant barrier. Sizing criteria for film gauge and top-sheet dimensions are detailed in our pallet wrapping machinery guide.

Dados RAS100

Especificação técnica RAS100 Standard Metric Notas de Engenharia
Grau de automação Fully automatic in-line PLC integrado com gerenciamento de receitas
Capacidade de saída 10–30 paletes por hora Dependent on load height and wrap recipe
velocidade do braço rotativo 10-14 rpm Closed-loop frequency inverter controlled
área de carga máxima × 1,400 1,400 mm Diagonal clearance envelope engineered for arm path
Especificações do filme LLDPE, 500 mm width, 76 mm (3 in) core Standard 17–35 µm stretch film rolls
Vertical carriage speed 2.9 m / min Independent VFD-driven lift chain
Wrap turn counters Bottom, middle, and top 0–99 programmable revolutions per tier
Cut and clamp mechanism Grampo pneumático, corte com fio quente, limpeza com escova Automatic tail capture and thermal sealing
In-line conveyor rating Powered driven rollers, up to 4,000 kg capacity 1.5 m infeed / outfeed sections, ~12 m/min speed
Machine dead weight Aproximadamente 1,500 kg Structural floor-mounted steel gantry

Estimativa de paletes por hora

Cycle time is governed by arm rotational speed, carriage vertical velocity, programmed turn counts, and top-sheet positioning. Below is an engineering time breakdown for a standard 1.8 m load height operating at nominal speed:

Step / Operational Phase Parâmetros de movimento Phase Duration
3 bottom reinforcement turns 12 rpm arm speed 15 s
Carriage ascent (1.8 m travel) Vertical travel at 2.9 m/min 37 ~ s
Carriage descent (1.8 m travel) Vertical travel at 2.9 m/min 37 ~ s
3 top lock turns (overlapping sheet) 12 rpm arm speed 15 s
Pallet indexing (1.5 m out / 1.5 m in) Roller conveyor at 12 m/min 15 s
Top-sheet dispensing and cutting Overhead carriage cycle 20 s
Duração total do ciclo Combined automatic sequence 139 ~ s
Theoretical operational throughput 3,600 s / 139 s ~26 pallets/h

Note on throughput: Film clamping, cutting, and pneumatic wipe-down require an additional 3–5 seconds depending on ambient temperatures and film thickness. Bottom wraps securely lash the product columns to the pallet baseboards; eliminating bottom turns to increase speed compromises transport stability under standard shipping deceleration tests. For taller loads (e.g., 2.2 m) or high-tension cross-wrapping recipes, throughput adjusts accordingly within the rated 10–30 pallets/hour envelope.

Serviços públicos e segurança

The RAS100 requires dry, filtered compressed air delivered at 0.6–0.8 MPa (6–8 bar) with clean dew-point filtration to ensure consistent actuation of the pneumatic clamp, top stabilizer cylinder, and cut-and-seal jaws. Electrical supply is customized at the factory to match local 3-phase plant voltages (e.g., 380V/415V/480V, 50/60 Hz).

Standard control and safety architecture incorporates:

  • Optical photoelectric sensors for pallet detection and automatic load-height tracking.
  • Safety safety bumpers along the perimeter of the rotating arm: tactile or optical anti-collision edges immediately trigger an emergency stop if any obstacle enters the rotational radius.
  • Dual-channel safety circuit with lockable main isolator disconnects (LOTO) and red mushroom-head E-stop buttons stationed at the main HMI panel and perimeter fencing posts.

Compliance meets regional market directives:

  • ISO 12100:2010Segurança de máquinas — Princípios gerais para projeto, avaliação de riscos e redução de riscos.
  • PT 415-6: 2013: Safety of packaging machines — Part 6: Pallet wrapping machines (specific type-C European safety harmonized standard).
  • PT 415-10: 2014: Safety of packaging machines — Part 10: General requirements.

Lista de verificação para seleção de uma embaladora de braço rotativo com folha superior

  • Load footprint and height: Minimum and maximum dimensions (including pallet overhang).
  • Maximum pallet gross weight: Verification against conveyor structural roll load ratings (up to 4,000 kg).
  • Load stability profile: Low layer friction, tall beverage configurations, or crush-sensitive boxes.
  • Environmental barrier requirements: Necessity of five-sided dust-proofing, moisture resistance, or UV protection via overhead polyethylene top cover.
  • Required hourly throughput: Target pallets per hour (10–30 range on RAS100; higher rates require high-speed twin-arm or ring wrappers).
  • Film recipe criteria: Required pre-stretch percentage, bottom/top reinforcement turn specifications.
  • Facility utilities: Compressed air availability (0.6–0.8 MPa) and plant supply voltage.

Perguntas frequentes sobre engenharia

Q: Why choose a rotary arm wrapper over a standard turntable wrapper? A: A rotary arm wrapper isolates the pallet load from rotational forces. Products that are top-heavy, poorly nested, extremely light, or exceeding 2,000 kg remain completely stationary on the conveyor, eliminating centrifugal load shifting or motor drive wear.

Q: How does the top-sheet integrate into the stretch wrap for moisture protection? A: The overhead applicator pulls and cuts a polyethylene sheet over the top surface. The film carriage then traverses to the top edge, wrapping stretch film over the extended skirt of the top sheet. Multiple programmed top turns clamp the sheet firmly against the vertical corners, producing a weather-resistant cap.

Q: What is the real-world throughput on an automated beverage packaging line? A: The RAS100 consistently produces 20–26 pallets per hour with a full top-sheet and double-wrap pass on a 1.8 m tall beverage load. Without top-sheet placement, simpler cycles can reach up to 30 pallets per hour.

Q: What is the maximum load envelope supported by the standard gantry? A: The standard RAS100 accommodates pallet loads up to 1,400 × 1,400 mm with an overhead arm clearance radius designed to clear load corners safely during rotation.

Q: What pneumatic supply pressure is required for continuous operation? A: The machine requires clean, dry compressed air regulated between 0.6 and 0.8 MPa (6–8 bar) to actuate the film clamping, cutting, brushing, and top stabilizer cylinders.

Próxima etapa

To integrate the RAS100 into your packaging line, our engineering team follows a structured three-step onboarding process:

  1. Submit your floor plan and pallet specs: Send your line elevation, pallet footprint matrix, and hourly target rate to info@fhopepack.com.
  2. Receive a formal engineering layout within 48 hours: We provide conveyor infeed/outfeed alignments, cycle time simulations, and utility schematics.
  3. Line integration & FAT review: Finalize safety interlock coordinates, sensor positions, and factory acceptance test protocols before delivery.

Fontes

Última revisão: 04/10/2026

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