Using shrink film in packaging industrial products is highly common and pivotal. However, one of the most important choices in this field is deciding between PVC shrink film and POF shrink film. In this article, we will compare PVC and POF shrink films from various perspectives, explain their key differences, and ultimately help you choose the best option according to your specific conditions and usage needs.
What Is Shrink Film?
Shrink nylon is a plastic material that contracts when exposed to heat, tightly wrapping around the product. This happens because of molecular orientation during production. Different shrink films are made from various base materials, layer structures, and production techniques.
Chemical Structure and Properties
PVC (Polyvinyl Chloride)
Shrink PVC is one of the traditional shrink film materials. To enhance flexibility, plasticizers are added during production.
POF (Polyolefin Shrink Film)
POF is a newer generation of shrink film made from polyolefins such as polyethylene and polypropylene. It offers improved strength, clarity, and environmental safety compared to PVC.
Technical Comparison between PVC and POF
| Criterion | POF | PVC |
|---|---|---|
| Clarity & Appearance | High clarity, glossy surface; better product presentation | Glossy/transparent but sometimes hazy or with halo effect |
| Mechanical Strength | Higher resistance to tearing and puncture | Acceptable strength but weaker under stress conditions |
| Shrink Force / Contraction | More uniform contraction; better for irregular shapes | Stronger contraction in some cases; risk of product distortion |
| Operating Temperature Range | Better performance at low temperatures, broader thermal stability | May become brittle at low temps or deform at high temps |
| Compatibility with Sealing Process | Requires slightly higher sealing temperature; stable in automatic lines | Lower melt point but may produce fumes or residue |
| Odor / Gaseous Emissions on Shrinking | Almost odorless; no harmful gases | Potential release of chlorine or harmful compounds when heated |
| Food Contact / Safety | Many types are food-grade | Due to chlorine and plasticizers, less recommended for food contact |
| Printability | Flat surface, suitable for high-quality printing | Print adhesion sometimes weaker; potential degradation over time |
Environmental & Safety Comparison
| Criterion | POF | PVC |
|---|---|---|
| Chemical Composition | Chlorine-free; simpler and safer formulation | Contains chlorine; often requires plasticizers and additives |
| Emissions on Heating / Burning | Minimal emissions; no chlorine gases or dioxins | Risk of emitting chlorine gases, dioxins, HCl |
| Recyclability | More recyclable and better accepted in mechanical recycling | More difficult to recycle; separation and contamination challenges |
| Environmental Load / Burden | Lower environmental burden; more aligned with modern eco standards | Higher burden; disposal and safe handling are more challenging |
| Occupational Safety in Production | Less odor / gas emission; less need for special ventilation | Possible odor or gas emissions; more ventilation / cleaning required |
| Regulatory / Market Considerations | Better fit with stringent health/environmental regulations | In some markets restricted or less favored due to chlorine content |
Economic Comparison
- Unit Cost: POF is slightly more expensive per kilogram.
- Overall Cost Efficiency: Polyeolfin shrink films reduces waste and maintenance, balancing cost over time.
- Machine Maintenance: POF leaves less residue and extends equipment lifespan.
- Regulatory Costs: PVC may incur additional disposal or compliance costs.
Best Applications
POF Shrink Film
- Food and pharmaceutical packaging
- High-transparency retail products
- Irregular-shaped items
- High-speed packaging lines
- Eco-conscious manufacturing environments
PVC Shrink Film
- Budget-sensitive, non-food products
- Low-speed or manual packaging setups
- Applications with minimal environmental restrictions
Practical Selection Tips
- Analyze total cost, not just film price.
- Check compliance with local environmental laws.
- Match film to machine type and sealing temperature range.
- Ensure desired transparency and finish for the target market.
Conclusion
POF shrink film provides superior clarity, strength, and environmental performance compared to PVC. Although PVC remains cheaper, the long-term efficiency, safety, and sustainability of POF make it the better option for modern packaging.
For expert advice or bulk orders, contact Keyhan Plastic for consultation and pricing.