MDO-PE (MOPE) explained: the film that makes all-PE pouches possible

For years, a standard pouch was PET on the outside for print and stiffness, and PE on the inside for sealing. That combination works well but cannot be recycled. MDO-PE, sometimes written MOPE, is the film that lets converters replace the PET and build the whole pouch from polyethylene.

How MDO-PE is made

Polyethylene is extruded into a film, then stretched in the machine direction over heated rollers. Stretching aligns the polymer chains, which makes the film:

• Stiffer, so pouches stand up and run well on machines;
• Clearer and glossier, which gives better print quality;
• Stronger in tensile and more dimensionally stable.

The process is sensitive. Small changes in temperature, stretch ratio or cooling change the film, so consistent supply is important.

Typical all-PE structures

• MDO-PE (reverse printed) / PE sealant: replaces PET/PE for dry foods, detergents and personal care.
• MDO-PE / barrier PE (with a small EVOH layer) / PE sealant: for products needing oxygen barrier.
• Metallised or coated MDO-PE / PE: for snacks and products needing light and moisture barrier.

What to watch

• Heat resistance: PE outer layers have a narrower sealing window than PET, so sealing jaws, dwell time and temperature need tuning.
• Barrier limits: to stay recyclable, barrier layers such as EVOH must stay within the limits set by recycling guidelines.
• Inks and adhesives must be compatible with PE recycling.
• Machine trials are essential before switching a running SKU.

MDO-PE or BOPE?

Biaxially oriented PE (BOPE) is stretched in both directions and is another route to all-PE packaging. The choice depends on the stiffness, clarity and puncture resistance your pack needs, and on film availability.

How we can help

With rotogravure printing up to 1300 mm, solvent-less lamination and in-house slitting, we can run MDO-PE trials on your artwork. Ask about all-PE structures.