Micro-layer coextrusion is a process used to create films composed of multiple layers, each often only a fraction of micrometers to a few micrometers thick.

These layers are typically made from different polymers, and the interface between them creates boundaries. These boundaries can significantly impact the physical properties of the resulting film.

When there are more different polymers used in the layers, the boundaries between these layers become more pronounced. The increased interface area can lead to several enhancements in the film’s physical properties::

• Making it more resistant to tearing, puncturing, or stretching.
• Minimizing curling.
• Improving deep draw.
• Impose unique combination of mechanical properties, for example:
  • High Stiffness and High Puncture Resistance
  • High Stiffness and High Impact Resistance

This increased interface area can lead to several enhancements in the physical properties of the film:

Barrier Properties:

• The presence of multiple layers with different barrier properties can create a composite film with enhanced barrier performance against gases, moisture, or other substances.

Thermal Properties:

• Different polymers have different thermal properties. By combining them in micro-layers, the resulting film can exhibit enhanced thermal stability and shrinkage.

ALPHA MARATHON offers a blown film die with tens of nano-or micro layers.

Prime applications include:

• Food Packaging: all forms of barrier and non-barrier applications; FFS (form/fill/seal); thermoforming (e.g. Clam-shell trays), shrink bags

Medical:

• IV bags and other sterile pouches

Industrial:

• Heavy Duty Shipping Sacks; shrink bundling/hoods; vapour barrier sheeting; protective sheets.

• Battery and capacitor insulator films.