What are the differences between mono-layer and multi-layer PE shrink films in terms of performance?

PE heat shrinkable films are widely used for packaging, bundling, and product protection. The choice between mono-layer and multi-layer shrink films affects various performance characteristics, including strength, clarity, shrinkage behavior, and cost-effectiveness.

1. Strength and Durability
Mono-layer films are generally less strong and more prone to tearing or puncturing, especially under heavy loads.
Multi-layer films offer better mechanical strength due to the combination of different resins in each layer, improving puncture resistance and load stability.

2. Shrinkage Behavior
Mono-layer films may shrink less evenly and can be more sensitive to temperature variations.
Multi-layer films tend to provide more uniform shrinkage, ensuring a tighter and more secure fit around packaged items.

3. Clarity and Appearance
Mono-layer films often have higher optical clarity, making them ideal for display packaging where product visibility is important.
Multi-layer films may have slightly reduced clarity due to the combination of different layers but offer better gloss and surface smoothness.

4. Barrier Properties
Mono-layer films have limited moisture and oxygen barrier properties, making them less suitable for sensitive packaging needs.
Multi-layer films can be designed with barrier-enhancing layers, improving protection against moisture, gases, and UV exposure.

5. Cost and Application Suitability
Mono-layer films are cheaper to produce and suitable for applications where basic protection and shrink performance are sufficient.
Multi-layer films are generally more expensive but provide superior strength, better sealing, and enhanced product protection, making them ideal for heavy-duty packaging and high-performance applications.