Automatic Tyre Packing Machine for Inline Toroidal Wrapping

Executive Summary

An automatic tyre packing machine is an inline packaging solution engineered to wrap passenger, commercial, and industrial tyres with stretch film as they traverse continuous production or logistics conveyors. In modern manufacturing and retreading facilities, manual tyre packaging creates an ergonomic hazard and a throughput bottleneck: high-friction tread compounds resist handling, and manual stretch wrapping yields inconsistent tension, exposing rubber to ozone degradation, moisture, and transport abrasion.

By integrating horizontal, eye-to-sky toroidal wrapping directly into the roller conveyor line, an inline tyre packing system eliminates manual lifting, secures consistent radial film overlap, and provides 360-degree environmental sealing. This engineering guide details the mechanical kinematics of inline tyre wrapping, establishes verified calculation models for cycle times and film yield, and outlines structural criteria for industrial conveyor integration.

Working Principle

The automatic inline tyre packing machine processes tyres positioned flat on a powered roller conveyor (“eye-to-sky” orientation, where the central bore axis is vertical). Unlike vertical turntable wrappers that require tilting the tyre onto its tread, the inline toroidal system performs orbital wrapping while the tyre remains horizontal:

  1. Conveyor Infeed & Centering: Upstream lines transport the tyre horizontally onto the packaging station at conveyor speeds of 2–4 m/min. Integrated photoelectric sensors detect the leading edge, stopping the tyre concentrically beneath the wrapping ring arch.

  2. Workpiece Elevation & Rotation Engagement: A dedicated station beneath the roller bed engages: dual motorized, polyurethane-coated support rollers lift pneumatically through the roller gaps to raise the tyre 15–30 mm above the conveyor bed. These auxiliary rollers rotate the tyre around its vertical central axis at a controlled surface speed.

  3. Orbital Ring Passage: A high-rigidity C-type rotating ring, carrying an externally mounted film carriage, passes vertically through the internal diameter (ID) of the tyre. The open bore geometry accommodates tyre inner diameters from 300 mm to 900 mm.

  4. Synchronized Toroidal Wrapping: The main ring rotates at 10–120 RPM through the tyre bore, wrapping film around the cross-section (sidewall, tread, bead). Simultaneously, the driven support rollers rotate the tyre horizontally. The ratio between ring rotational speed and tyre axial rotation defines the radial film overlap (programmable between 10% and 90%).

  5. Film Clamping, Cutting & Discharge: Upon completing the programmed rotational cycle (typically 360° plus a 20° tail overlap), a pneumatic clamp secures the film, an electric hot-wire or mechanical serrated blade cuts the web, and a pneumatic wiping arm presses the tail firmly against the tyre body. The support rollers lower, and the wrapped tyre discharges downstream. Total cycle time ranges from 20 to 35 seconds per tyre.

       [ Film Carriage on Vertical Rotating Ring ]
                        │   ▲
                        ▼   │  (Passes through eye)
     ┌──────────────────┼───┼──────────────────┐
     │  Tyre Tread      │   │     Tyre Tread   │
     │  ┌───────────────┘   └───────────────┐  │
     │  │   Tyre Eye (Vertical Bore Axis)   │  │
     └──┴───────────────────────────────────┴──┘
          ▲                               ▲
          │                               │
    [ Driven Support Roller ]       [ Driven Support Roller ]
         (Rotates flat tyre around vertical axis)

Published Specifications

The technical parameters below represent standard inline tyre packaging systems. Final performance metrics depend on tyre bead profile, dimensional envelopes, and specified film gauge.

Engineering Parameter Metric Specification Imperial Specification
Tyre Outer Diameter (OD) 600–1,400 mm 23.6–55.1 in
Tyre Inner Diameter (ID / Rim Size) 300–900 mm 11.8–35.4 in
Tyre Section Width (Height Lying Flat) 150–350 mm 5.9–13.8 in
Maximum Unit Weight 10–100 kg 22–220 lbs
Packaging Cycle Time 20–35 s/tyre 20–35 s/tyre
Ring Rotational Speed 10–120 RPM 10–120 RPM
Tyre Infeed Roller Speed 2–4 m/min 6.5–13.1 ft/min
Film Width Capability 100–250 mm 4.0–10.0 in
Powered Pre-Stretch Ratio 150%–300% 150%–300%
Control Architecture Siemens S7-1200 PLC + HMI Siemens S7-1200 PLC + HMI
Pneumatic Supply 0.5–0.7 MPa 72.5–101.5 PSI

When specifying an automatic tyre packing line for custom retread or OEM operations, verify the dimensional tolerances below:

Parameter Group Engineering Verification Checklist
Dimensional Envelope Verify absolute minimum ID and maximum tread OD to guarantee mechanical ring clearance.
Infeed Roller Integration Confirm roller bed centerline height (standard: 650–800 mm) matches plant conveyor datum.
Pre-Stretch Mechanism Select powered dual-roller stretch for thin gauge films (17–23 µm) to prevent bead tearing.
Tail Management Specify pneumatic heat-seal wiping if tyres encounter outdoor or rough intermodal transit.
Electrical Specifications Verify motor line voltages (380V/480V 3-phase, 50/60 Hz) and 24V DC field bus protocols.

Engineering Calculation: Sizing Throughput and Film Yield

To verify that an inline wrapper satisfies line tact times without creating upstream accumulation, apply the kinematic formulas below.

1. Synchronized Ring Revolutions for Radial Overlap

Unlike horizontal wrappers that traverse along a linear workpiece, an inline tyre wrapper rotates the film vertically through the central bore while the tyre rotates 360° around its vertical axis.

The minimum ring revolutions (N_ring) required for a single complete 360° radial pass are governed by the tyre’s outer circumference and the effective linear advance per ring cycle:

N_ring = (π × OD) / (W_film × (1 - Overlap_ratio))

Example Calculation:

  • Tyre Outer Diameter (OD) = 800 mm
  • Film Roll Width (W_film) = 150 mm
  • Desired Film Overlap = 50% (Overlap_ratio = 0.50)
Effective Film Coverage per Pass = 150 mm × (1 - 0.50) = 75 mm
Outer Circumference = 3.1416 × 800 mm = 2,513.3 mm
N_ring = 2,513.3 / 75 ≈ 34 revolutions

2. Wrapping Cycle Time Determination

The net wrapping duration (T_wrap) is determined by the maximum stable rotational speed of the orbital ring (RPM_ring):

T_wrap = (N_ring / RPM_ring) × 60 seconds

If operating at RPM_ring = 90 RPM:

T_wrap = (34 / 90) × 60 = 22.7 seconds

The total inline cycle time per tyre (T_total) incorporates mechanical handling overhead:

T_total = T_infeed + T_lift + T_wrap + T_cut + T_discharge

Assuming T_infeed = 3 s, T_lift = 1.5 s, T_cut = 2 s, and T_discharge = 3 s:

T_total = 3 + 1.5 + 22.7 + 2 + 3 = 32.2 seconds/tyre

This yields an effective system output of approximately 111 tyres per hour, matching continuous automated tyre curing line rhythms.

3. Film Consumption per Unit

The film length consumed per tyre (L_film) depends on the cross-sectional perimeter (P_cross) of the tyre toroidal profile, the ring revolutions, and the pre-stretch elongation:

P_cross ≈ 2 × (Tyre_width + (OD - ID) / 2)
L_film = (P_cross × N_ring) / (1 + Pre_stretch_ratio)

With P_cross = 1,100 mm (1.1 m), N_ring = 34, and a pre-stretch ratio of 200% (Pre_stretch_ratio = 2.0):

L_film = (1.1 m × 34) / (1 + 2.0) = 37.4 / 3.0 ≈ 12.5 meters of un-stretched film per tyre

Technical Selection Matrix

Select inline packaging machine configurations based on production profile and automation integration depth:

Operating Characteristic Semi-Automatic Standalone Wrapper Fully Automatic In-Line Toroidal System High-Speed Continuous Packaging Line
Line Integration Off-line batch staging Integrated roller conveyor line High-speed multi-station indexing line
Throughput Capacity 30–50 tyres/hour 80–120 tyres/hour 140–200+ tyres/hour
Loading Method Manual positioning on rollers Automated conveyor positioning Continuous servo-tracked positioning
Tyre Bore Engagement Manual film tie-off Automatic lift-and-rotate drive Dual-axis high-speed orbital shuttle
Cut and Clamp System Manual operator cut Pneumatic cut & tail press High-speed hot knife with wipe-down
Labor Dependency 1 dedicated operator Unmanned (line supervisory only) 100% Unmanned automated line

Safety and Structural Compliance

Inline rotating packaging machinery introduces mechanical nip points, high-speed rotational momentum, and thermal or pneumatic cutting hazards. Systems must conform to the following harmonized industrial standards:

  • EN 415-10 Safety Standard: Specific to automated packaging and wrapping machines. Requires interlocking guards that cut motor drive power to the orbital ring within 0.5 seconds of barrier breach.
  • ISO 12100:2010: Standardized methodology for machinery risk assessment, hazardous zone mitigation, and ergonomic infeed alignment.
  • Pneumatic Lockout (OSHA 1910.147): Integrated air exhaust valves to discharge residual pressure from tyre lift cylinders during maintenance.
  • Optical Area Guarding: Category 4 safety light curtains at conveyor infeed and outfeed portals, dynamically muted only by authorized workpiece profiles to prevent personnel entry into the ring path.

Frequently Asked Questions

Does the tyre need to be flipped vertically before wrapping? No. The inline toroidal wrapper processes tyres in the horizontal “eye-to-sky” orientation. Integrated lifting rollers raise the tyre clear of the flat conveyor so the vertical wrapping ring passes unobstructed through the internal bore.

How does the machine accommodate varying tyre widths without retooling? The orbital ring’s internal clear aperture handles tyres with section widths from 150 mm to 350 mm. The programmable PLC dynamically adjusts the support roller rotation speed relative to the fixed ring RPM to preserve constant film overlap.

Can the wrapping station interface with barcode readers or plant MES? Yes. Modern PLC architectures feature industrial Ethernet (PROFINET, EtherNet/IP) to read incoming tyre bead barcodes, automatically loading product recipes (overlap %, ring RPM, pre-stretch tension) without line stoppage.

What film types are compatible with high-speed automated wrapping? Cast LLDPE stretch film (17–35 µm gauge) is standard. For UV protection or outdoor tire storage, black pigmented films or VCI (Vapor Corrosion Inhibiting) co-extruded films for studded or wire-bead tyres can be deployed directly.

Next Steps & Application Engineering

To obtain an accurate kinematic cycle time analysis and layout proposal for your tyre packaging line, compile the following production parameters prior to factory consultation:

  1. Minimum and maximum tyre matrix (Outer Diameter, Bead Inner Diameter, Section Width).
  2. Tread compound characteristics (dry slick, deep-groove off-road, or wet-tack rubber).
  3. Target cycle tact time (units/minute) and plant conveyor top-of-roller datum height.
  4. Upstream/downstream interface protocols (dry contact relay vs. industrial fieldbus).

Review our comprehensive engineering demonstrations:

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