Shrink Wrapping in Modern Packaging
Shrink wrapping creates secure, visually appealing retail-ready bundles. Used shrink wrappers from manufacturers such as Ocme, ACMI, SMI, Atlanta, and Robopac can be assessed on documented condition and wear-part status.
Film Types and Compatibility
| Film Type | Thickness | Temperature | Application |
|---|---|---|---|
| PE (polyethylene) | 30–80 µm | 150–200°C | Most common for beverages |
| PVC | 15–30 µm | 100–140°C | Lighter products |
| POF (polyolefin) | 15–25 µm | 130–170°C | Retail/food products |
Tunnel Condition Assessment
- Heating element uniformity — check for cold spots
- Air circulation fan condition
- Conveyor chain through tunnel — heat-exposed chains degrade faster
- Insulation integrity — degraded insulation increases energy costs
- Temperature control accuracy — verify PID controller response
Sealing System Evaluation
The sealing bar creates the film closure before the tunnel. Inspect bar straightness, PTFE coating condition, cutting wire tension, and temperature distribution along the bar length. Uneven sealing causes film rupture in the tunnel.
Format Flexibility
Evaluate the range of pack configurations the machine can handle: 2×3, 3×4, 4×6, etc. Check if the infeed grouping system can accommodate your container diameter range without expensive modifications.
Frequently asked questions
How long does a shrink tunnel last?
With proper maintenance, shrink tunnels last 10–20 years. Heating elements and conveyor chains are the main consumable components.
What is the biggest issue with used shrink wrappers?
Tunnel condition is the most common issue. Corroded tunnels, failed heating elements, and worn conveyor chains cause inconsistent pack quality.