Beyond Oxygen Barriers: When Should You Choose PA EVOH PE Multilayer Film?

In modern flexible packaging, oxygen protection is one of the most important factors influencing product shelf life, freshness, and quality stability. However, achieving reliable barrier performance requires more than simply selecting a material with low oxygen permeability.

Different packaging applications also require a balance between oxygen barrier properties, mechanical strength, puncture resistance, sealing performance, and processing compatibility.

This is why PA/EVOH/PE multilayer film has become an important solution for high-performance packaging applications.

A multilayer film combines different polymer materials, allowing each layer to perform a specific function. In a typical PA/EVOH/PE structure:

• PA provides mechanical strength and puncture resistance.

• EVOH delivers excellent oxygen barrier performance.

• PE provides flexibility, moisture resistance, and heat sealing performance.

Through multilayer structure design, manufacturers can achieve a balanced packaging solution suitable for demanding applications such as food packaging, vacuum packaging, and other high-barrier applications.

Selecting the right multilayer structure is not simply about achieving the highest barrier level. It requires a comprehensive understanding of product characteristics, packaging processes, and final application requirements.

Understanding the PA/EVOH/PE Multilayer Structure

A PA/EVOH/PE multilayer film is designed by combining different polymer materials into a functional layered structure.

Instead of requiring one material to provide all performance characteristics, each layer contributes specific advantages.

A typical structure includes:

PA (Polyamide) Layer – Mechanical Protection

PA provides:

• Excellent toughness

• High tensile strength

• Strong puncture resistance

• Improved durability

The PA layer is especially valuable in applications where packaging may experience mechanical stress, vacuum pressure, or transportation impact.

EVOH (Ethylene Vinyl Alcohol) Layer – Oxygen Barrier Protection

EVOH is widely recognized as one of the most effective polymer-based oxygen barrier materials.

The EVOH layer helps:

• Reduce oxygen transmission

• Protect sensitive products from oxidation

• Extend product shelf life

However, EVOH is sensitive to humidity. Therefore, it is normally positioned as a core barrier layer protected by surrounding polymer layers.

PE (Polyethylene) Layer – Sealing and Moisture Protection

PE provides:

• Reliable heat sealing performance

• Good flexibility

• Moisture resistance

• Processing compatibility

The PE layer also helps protect the EVOH barrier layer from environmental moisture.

Tie Layer – Interlayer Adhesion

In multilayer co-extruded films, tie layers are used between different polymers to improve adhesion.

Because materials such as PA, EVOH, and PE have different chemical characteristics, tie layers are essential to maintain:

• Strong layer bonding

• Structural stability

• Consistent film performance

  
  

Why EVOH Improves Oxygen Barrier Performance

Oxygen exposure can cause oxidation, color changes, flavor loss, and reduced shelf life for many packaged products.

For this reason, oxygen barrier performance is a critical consideration in advanced packaging design.

Compared with conventional PE films, EVOH provides significantly improved oxygen resistance.

However, the final performance of a multilayer film depends not only on EVOH itself, but also on:

• EVOH thickness

• Layer ratio

• Film structure design

• Processing conditions

A well-designed PA/EVOH/PE structure combines oxygen protection with mechanical durability and sealing reliability.

PA/EVOH/PE vs PA/PE Film: What Is the Difference?

PA/PE films are widely used in flexible packaging because they provide good mechanical strength and sealing performance.

However, when products require stronger oxygen protection, adding an EVOH barrier layer can significantly improve packaging performance.

The main difference between PA/PE and PA/EVOH/PE is the oxygen barrier capability.

PA/PE:

• Provides good toughness

• Offers reliable sealing performance

• Suitable for applications with moderate barrier requirements

PA/EVOH/PE:

• Adds an EVOH oxygen barrier layer

• Provides improved protection against oxidation

• Suitable for products requiring extended shelf life

The choice between these structures depends on:

• Product sensitivity to oxygen

• Required shelf life

• Vacuum or modified atmosphere packaging requirements

• Transportation conditions

• Mechanical protection requirements

There is no universally better structure. The optimal solution depends on the complete packaging system.

Applications of PA/EVOH/PE High Barrier Film

Demand for high-performance multilayer films continues to grow as industries require better product protection and longer shelf life.

Common applications include:

Food Packaging

PA/EVOH/PE films are widely used for products requiring:

• High oxygen barrier performance

• Reliable sealing

• Strong mechanical protection

  
  

Meat and Seafood Packaging

Vacuum packaging applications often require:

• Excellent puncture resistance

• Stable barrier performance

• Reliable sealing under vacuum conditions

PA/EVOH/PE structures are commonly selected for demanding applications where packaging integrity is critical.

Medical and Pharmaceutical-Related Packaging

High barrier films may be used in applications requiring:

• Stable material performance

• Reliable sealing properties

• Protection from environmental exposure

Specific requirements depend on the final application and regulatory standards.

Customized PA/EVOH/PE Multilayer Film Solutions from GroupSmart

Choosing a multilayer film supplier requires more than comparing individual material specifications.

A successful packaging solution must consider:

• Product characteristics

• Packaging equipment

• Processing conditions

• Storage environment

• Performance requirements

GroupSmart specializes in the development and production of multilayer co-extruded cast films.

With advanced 11-layer co-extrusion technology, GroupSmart can customize structures combining:

• PE

• PA

• EVOH

• Tie layers

to achieve the desired balance of:

• Oxygen barrier performance

• Mechanical strength

• Sealing reliability

• Film flexibility

  
  

Advanced Manufacturing Capability and Quality Control

GroupSmart operates advanced German W&H 11-layer co-extrusion cast film production lines, providing customers with stable and customized high barrier film solutions.

Our technical capabilities include:

• Customized multilayer structure design

• High barrier film production

• Film performance evaluation

• Application-based technical support

Our laboratory testing capabilities include:

• Oxygen Transmission Rate (OTR)

• Water Vapor Transmission Rate (WVTR)

• Tensile strength testing

• Heat seal strength testing

• Coefficient of friction testing

• Haze and transparency testing

Supported by quality management systems including ISO 9001, FSSC 22000, and BRC, GroupSmart works with global customers to develop reliable packaging film solutions.

Choosing the Right Barrier Structure for Better Packaging Performance

The advantage of PA/EVOH/PE multilayer film comes from the cooperation between different functional layers.

PA provides mechanical protection.

EVOH provides oxygen barrier performance.

PE provides sealing and flexibility.

Together, these materials create a balanced packaging solution for demanding applications.

Choosing the right multilayer film is not about selecting the strongest material alone. It is about matching film structure, production requirements, and end-use conditions.

Through advanced 11-layer co-extrusion technology and customized film development, GroupSmart helps customers create packaging solutions designed for reliable performance throughout the product lifecycle.