PE EVOH PE Film or PA EVOH PE Film? Selecting the Best Barrier Structure for Your Packaging

Selecting the right barrier film structure is essential for companies seeking reliable packaging performance. In applications where oxygen protection, product safety and shelf life are critical, multilayer co-extruded films provide an effective solution by combining different polymers with specific functions.

Among high barrier packaging structures, PE/EVOH/PE film and PA/EVOH/PE film are two widely used solutions. Both structures utilize EVOH as the core oxygen barrier layer, while PE and PA provide different performance advantages.

However, choosing the right structure is not simply about selecting the film with the highest barrier performance. Factors such as mechanical strength, puncture resistance, sealing performance, flexibility, processing conditions and final application requirements must all be considered.

Understanding the differences between PE/EVOH/PE and PA/EVOH/PE helps packaging manufacturers select the most suitable solution for food packaging, medical applications and other demanding industries.

Why EVOH Is Used in High Barrier Films

EVOH (Ethylene Vinyl Alcohol) is one of the most effective polymer-based oxygen barrier materials used in flexible packaging.

Its excellent oxygen resistance helps protect sensitive products from:

• Oxidation

• Quality degradation

• Loss of freshness

• Reduced shelf life

However, EVOH is a hydrophilic material, and its oxygen barrier performance may decrease under high humidity conditions. Therefore, EVOH is normally used as a core barrier layer protected by moisture-resistant polymers such as PE or PA.

A multilayer barrier film combines different materials to achieve balanced performance:

EVOH Layer – Oxygen Barrier Protection

The EVOH layer provides:

• Excellent oxygen barrier performance

• Improved shelf life protection

• Reduced oxygen transmission

  
  

PE Layer – Sealing and Moisture Protection

PE layers provide:

• Reliable heat sealing performance

• Moisture resistance

• Flexibility

• Good process compatibility

  
  

PA Layer – Mechanical Strength

When PA is included in the structure, it provides:

• Higher puncture resistance

• Improved toughness

• Better tensile strength

• Enhanced dimensional stability

Through multilayer design, manufacturers can create films that meet different packaging requirements.

PE/EVOH/PE Film: Flexible High Barrier Solution

PE/EVOH/PE film is a structure designed to achieve excellent oxygen barrier performance while maintaining flexibility and reliable sealing performance.

The PE layers provide protection for the EVOH barrier layer and create a package structure that is suitable for applications where mechanical stress is moderate.

Advantages of PE/EVOH/PE Film

Excellent Oxygen Barrier

With an EVOH core layer, PE/EVOH/PE film can provide significantly improved oxygen resistance compared with conventional PE films.

Excellent Sealing Performance

PE provides stable heat sealing characteristics, making the structure suitable for efficient packaging operations.

High Flexibility

Compared with PA-containing structures, PE-based barrier films generally provide greater softness and flexibility.

Typical Applications

PE/EVOH/PE film can be used for:

• High barrier food packaging

• Liquid packaging

• Flexible packaging applications

• Pharmaceutical-related packaging requiring oxygen protection

  
  

PA/EVOH/PE Film: High Strength Barrier Solution

PA/EVOH/PE film adds a PA layer to provide enhanced mechanical performance.

The PA layer improves the film’s resistance to puncture, stretching and external stress, making it suitable for more demanding applications.

Advantages of PA/EVOH/PE Film

Superior Mechanical Strength

PA provides:

• High toughness

• Excellent puncture resistance

• Better durability during transportation

  
  

Improved Protection for Challenging Products

PA/EVOH/PE structures are commonly selected when packaging may experience:

• Vacuum stress

• Sharp product edges

• Long-distance transportation

• Heavy handling conditions

  
  

Typical Applications

PA/EVOH/PE film is widely used in:

• Vacuum packaging

• Meat packaging

• Seafood packaging

• Thermoforming applications

• High-strength flexible packaging

  
  

PE/EVOH/PE vs PA/EVOH/PE: Performance Comparison

Both structures can provide excellent barrier protection. The optimal choice depends on the actual packaging environment rather than one structure being universally better.

How to Select the Right Barrier Film Structure?

When selecting between PE/EVOH/PE and PA/EVOH/PE, manufacturers should consider:

1. Product Characteristics

Products with sharp edges or irregular shapes may require stronger puncture resistance.

2. Packaging Process

The film should match:

• Vacuum packaging equipment

• Thermoforming machines

• Heat sealing conditions

  
  

3. Storage and Transportation Conditions

Long transportation distances or demanding handling environments may require stronger mechanical protection.

4. Shelf Life Requirements

Products requiring extended shelf life may benefit from optimized EVOH barrier structures.

A successful packaging solution requires balancing barrier performance, mechanical strength and processing compatibility.

Customized 11-Layer Co-Extruded Barrier Films from GroupSmart

GroupSmart specializes in the development and production of multilayer co-extruded cast films for high-performance packaging applications.

With advanced 11-layer co-extrusion technology, GroupSmart can precisely combine functional layers including:

• PE

• PA

• EVOH

• Tie layers

to develop customized film structures according to customer requirements.

Compared with conventional multilayer films, 11-layer co-extrusion technology provides greater flexibility in layer design, allowing manufacturers to optimize:

• Oxygen barrier performance

• Mechanical strength

• Sealing performance

• Film thickness distribution

• Overall packaging reliability

  
  

Professional Manufacturing Capability and Quality Control

GroupSmart operates advanced film production facilities equipped with German W&H 11-layer co-extrusion cast film lines.

Our manufacturing capabilities include:

• Customized multilayer film development

• High barrier cast film production

• Stable thickness control

• Professional quality inspection

Our laboratory evaluates film performance through:

• Oxygen Transmission Rate (OTR)

• Water Vapor Transmission Rate (WVTR)

• Tensile strength testing

• Heat sealing strength testing

• Friction coefficient testing

• Haze and transparency testing

With quality management systems including ISO 9001, FSSC 22000 and BRC certifications, GroupSmart is committed to providing reliable barrier film solutions for global customers.

Choosing the Right Structure Creates Better Packaging Performance

There is no single barrier film structure that is suitable for every application.

PE/EVOH/PE film provides an excellent balance of oxygen barrier, flexibility and sealing performance.

PA/EVOH/PE film offers enhanced mechanical strength and puncture resistance for more demanding packaging conditions.

The best solution comes from matching film structure, production requirements and end-use conditions.

Through advanced 11-layer co-extrusion technology and professional technical support, GroupSmart helps customers develop customized high barrier film solutions that deliver reliable performance throughout the product lifecycle.