Hose Coil Stretch Wrapping Machine

Executive Summary Eye-through orbital wrapping protects coiled garden hoses, pneumatic tubes, and flexible plastic conduit from abrasion, coil expansion, and moisture contamination during storage and multimodal freight. This horizontal turntable wrapping station synchronizes a rotating annular ring with motorized polyurethane support rollers, driving stretch film or woven tape axially through the inner core (eye) while orbiting the coil bundle. Total stretch film consumption is precisely governed by coil cross-sectional perimeter, core-to-outer diameter ratios, and ring-to-turntable rotational speed ratios (overlap percentage).

Table of Contents

Machine Architecture & Orbital Kinematics

The orbital stretch wrapping system is designed for toroidal bundles, including extruded rubber hoses, PVC corrugated conduit, and PEX piping coils. The mechanical assembly is anchored on an industrial steel base frame housing the variable-frequency drive (VFD) motors, internal gearing, and safety interlocks.


       [ Rotating Annular Ring ]  <--- Carries Stretch Film Carriage
              /         \
   ==========|=== EYE ===|==========  <--- Planetary Orbit Path
             \           /
      [ Polyurethane Support Rollers ]  <--- Driven Turntable Axis

The coil rests horizontally on a radial array of polyurethane-coated cradle rollers. These motorized rollers rotate the coil along its polar axis. Simultaneously, an arched, high-tensile cast-alloy ring guided by heavy-duty nylon/polyurethane track rollers traverses perpendicular to the cradle, passing directly through the open core (eye) of the coil.

As the orbital ring rotates, the film carriage dispenses LLDPE film, VCI anti-corrosion barrier, or woven polypropylene tape under adjustable mechanical brake tension. The coordinated dual-axis movement—table rotation paired with annular orbit—produces a continuous, multi-layer helical wrap across 360° of the toroidal core.

Coil Wrapping Cycle Sequence

The packing cycle balances rapid throughput with bundle containment integrity. Operational phases correlate directly with the synchronized drive controls:

Sequence Phase Mechanical Function & Drive Motion Operational Duration
Phase 1: Loading & Indexing Coil is centered onto the polyurethane cradle rollers; safety interlocks verify zero clearance conflict with the internal ring arc. 0–10 s (Manual / Infeed)
Phase 2: Helical Orbital Wrapping Ring accelerates to operational speed (40–80 RPM); turntable rotates to advance the coil through the ring axis under pre-set overlap. 10–35 s (Automated)
Phase 3: Film Cut & Coil Ejection Ring decelerates to zero index position; manual or pneumatic cutter severs the film tail; bundle is cleared for palletizing. 35–45 s (Cycle Complete)

Kinematic synchronization is maintained via the central PLC: the relationship between the ring motor RPM and turntable roller drive speed directly dictates the linear wrap advance per revolution.

Film Consumption & Overlap Mechanics

Estimating film volume per unit requires analyzing the cross-sectional geometry and the mechanical overlap ratio. Below is an engineering baseline calculation for a representative industrial hose coil:

Parameter Specification Formula / Sizing Logic Metric Value
Outer & Inner Diameter (OD × ID) Specified coil geometry 600 mm × 350 mm
Coil Height (H) Bundle cross-sectional vertical stack 150 mm
Radial Wall Thickness (W) W = (OD − ID) ÷ 2 = (600 − 350) ÷ 2 125 mm
Section Perimeter (P_sec) P_sec = 2 × (W + H) = 2 × (125 + 150) 550 mm (0.55 m)
Mean Toroid Diameter (D_mean) D_mean = (OD + ID) ÷ 2 = (600 + 350) ÷ 2 475 mm (0.475 m)
Mean Centerline Circumference (C_mean) C_mean = π × D_mean = 3.1416 × 0.475 m 1.492 m
Feed Advance per Orbit (A_wrap) Sized for ~50% overlap using 100 mm film roll 50 mm (0.05 m)
Total Orbital Cycles (N_wraps) N_wraps = C_mean ÷ A_wrap = 1.492 ÷ 0.05 ~30 ring cycles
Net Film Consumption (L_film) L_film = N_wraps × P_sec = 30 × 0.55 m 16.5 m (linear)

Note: If adopting an orbital carriage with a mechanical pre-stretch unit running at a 150% elongation ratio, actual unspooled raw film length reduces according to: L_raw = L_film ÷ (1 + Pre-stretch%).

Control Architecture & Safety Engineering

High-speed orbital rings generate significant centrifugal force and rotary inertia, demanding strict compliance with plant safety directives:

  • Operator Controls: The machine interface includes an integrated main disconnect switch, independent VFD speed potentiometers for both the ring and turntable, and a redundant dual-channel safety Emergency Stop (E-stop) push button.
  • Risk Mitigation (ISO 12100 / EN ISO 13849-1): Moving orbital rings represent critical shear and pinch zones. The operating envelope requires hard perimeter fencing with safety interlock switches, or integrated Type 4 optical safety light curtains to halt ring movement instantly if broken.
  • Machinery Directive Harmonization (EN 415-10): Compliance requires zero-energy lockout/tagout (LOTO) protocols for film reel changeover, anti-drop mechanical pawls for vertical ring mechanisms, and controlled deceleration profiles to prevent ring derailment.

Selection Checklist for Hose Coil Packaging

Evaluate these baseline parameters before specifying orbital ring dimensions and turntable configurations:

  • Coil Dimensional Envelope: Minimum ID (must exceed ring cross-section width + carriage envelope) along with maximum OD and stack height.
  • Weight Range: Structural rating of the drive cradle (e.g., lightweight PE tube at 10 kg vs. heavy wire-braided hydraulic hose at 150 kg).
  • Packaging Material Properties: LLDPE stretch film (17–35 µm), HDPE woven strip, VCI film, or crepe paper.
  • Target Overlap Percentage: Selectable between 20% (dust protection) and 70% (watertight/heavy sea freight bundling).
  • Throughput Demands: Target output in coils per hour or shift (e.g., 40–90 coils/hour).
  • Line Integration: Standalone semi-automatic manual station vs. inline automatic conveyor with automated pneumatic tail clamping and cutting.

Engineering FAQ

Q: How does the system achieve 100% surface encapsulation on a toroidal coil? A: Encapsulation occurs via synchronized orthogonal rotation: the motorized cradle rollers index the coil around its vertical centerline while the annular ring continuously loops film through the internal eye, creating a multi-layer helical envelope.

Q: Can a single wrapper accommodate different coil sizes without retooling? A: Yes, within physical geometric limits. The maximum coil height and wall thickness must clear the internal clear aperture of the orbital ring, while the minimum coil ID must accommodate both the ring frame and the mounted film spool holder.

Q: How is wrap overlap adjusted for export shipping? A: Wrap overlap is governed by the rotational speed ratio between the ring inverter and turntable inverter. Slowing the turntable relative to the ring increases overlap up to 70%–80% for reinforced structural bundling.

Q: What tension mechanisms prevent flexible hose coils from collapsing? A: The film carriage incorporates a friction-plate mechanical brake or magnetic particle tension controller. Tension is calibrated to provide bundle cohesion without kinking or ovalizing thin-walled hoses.

Q: What power and air supplies are required for installation? A: Standard configurations operate on 3-phase 380V/480V 50/60 Hz power. Automated models equipped with pneumatic clamping and cutting require a clean, dry compressed air supply at 0.5–0.7 MPa.

Next Step & Specification Sizing

Optimize your hose coil packing line through our OEM sizing program:

  1. Submit Coil Dimensions: Provide your minimum/maximum ID, OD, stack heights, and bundle weights to info@fhopepack.com.
  2. Technical Feasibility Analysis: Our engineering group generates a formal mechanical drawing and kinematics proposal within 48 hours.
  3. Application Review: Schedule a video conference or factory trial to validate film overlap configurations, cycle times, and safety integration.

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