EVA vs. POE vs. EPE Solar Encapsulation Films: Market Trends & How to Choose the Right Extrusion Line

Executive Summary for PV Encapsulation Film Line Buyers

As N-type TOPCon and HJT solar technologies become mainstream, selecting the right photovoltaic (PV) encapsulation material—and the corresponding extrusion equipment—is critical for solar module performance. While EVA remains the low-cost standard and POE offers superior PID and water barrier properties, EPE co-extruded film (EVA/POE/EVA) has emerged as the most cost-effective solution for dual-glass and bifacial modules.

As a leading plastic extrusion machinery manufacturer, GWELL Machinery provides high-efficiency, multi-layer co-extrusion production lines designed to overcome processing challenges like POE additive slip and layer thickness variation in EPE film manufacturing.

1. EVA Film: Pros, Cons, and Machinery Requirements

Ethylene-Vinyl Acetate (EVA) film has long dominated the PV module encapsulation market due to its mature processing technology and cost-effectiveness.

• Advantages:

  • Cost-Efficient & Abundant Raw Materials: Lower material cost with stable domestic supply chains.

  • High Light Transmittance: Maximizes solar cell light absorption.

  • Strong Adhesion & Fast Cross-Linking: Excellent bonding strength to glass and backsheets, allowing rapid lamination cycles.

• Disadvantages:

  • Hydrolysis & Acetic Acid Generation: Degrades under high heat and moisture, producing acetic acid that corrodes solar cell ribbons.

  • Yellowing Risk: Prone to discoloration under long-term UV and thermal stress, reducing long-term efficiency.

• GWELL Machine Capability: EVA film production requires precise temperature control to prevent premature cross-linking inside the extruder. GWELL EVA Single/Multi-layer Extrusion Lines utilize specialized low-shear screws and high-precision temperature-control systems, ensuring high output speeds (up to 30m/min) while maintaining thermal stability.

2. POE Film: Pros, Cons, and Processing Challenges

Polyolefin Elastomer (POE) film is essential for high-efficiency modules (such as PERC dual-glass, N-type TOPCon, and heterojunction cells) due to its zero-water-absorption characteristic.

• Advantages:

  • Superior PID & Water Vapor Resistance: Highest electrical resistivity and lowest water vapor transmission rate (WVTR).

  • Zero Acetic Acid Corrosion: Chemical stability prevents cell contact degradation.

  • Anti-Yellowing & Thermal Aging Resistance: Ideal for offshore, floating, and harsh desert environments.

• Disadvantages:

  • High Material & Processing Cost: POE resins are significantly more expensive and heavily reliant on imports.

  • Extrusion & Lamination Difficulties: Non-polar POE resins cause cross-linking additives to migrate to the surface, leading to roller slipping, air bubbles, and lower lamination yield.

• GWELL Machine Capability: To solve the POE slip and additive separation issue, GWELL POE Extrusion Lines feature specialized screw geometry designed for low-temperature mixing, high-torque drive units, and textured embossing rollers that enhance surface friction and gas bubble release during lamination.

3. EPE Co-Extruded Film: The Ultimate Market Choice

EPE (EVA/POE/EVA) film is a 3-layer co-extruded structure that combines the best of both worlds: the high adhesion and fast lamination of outer EVA layers with the high moisture barrier and PID resistance of the inner POE core.

Key Advantages of EPE Film:

1. Balanced Cost-Performance Ratio: Reduces POE resin usage by up to 50% compared to pure POE film while retaining 90%+ of its barrier performance.

2. Eliminates Roller Slip: The outer EVA layers provide excellent surface grip, eliminating the processing instability associated with pure POE lines.

3. Superior Delamination Resistance: Multi-layer co-extrusion technology prevents inter-layer peeling during module lifespan.

4. GWELL EPE Solar Film Production Line Solutions

For PV film manufacturers, transitioning to EPE production requires advanced multi-layer co-extrusion machinery capable of precise layer ratio control. GWELL Machinery offers cutting-edge 3-Layer (ABA / ABC) Solar Encapsulation Film Extrusion Lines engineered for high-volume manufacturing.

GWELL Equipment Highlights:

• Multi-Extruder Co-Extrusion Architecture: Independent extrusion systems for EVA and POE layers allow precise regulation of the inner core layer thickness ratio (typically 1:2:1 or 1:1:1).

• Automatic Thickness Control (X-Ray Gauge): In-line closed-loop thickness measurement guarantees uniform film weight across widths up to 2,800 mm.

• Anti-Slip & Tension Management: Custom embossing chill rollers and multi-stage automatic winders prevent film stretching, sticking, and static buildup.

• Flexibility (EVA/POE/EPE All-in-One): GWELL lines are designed with high versatility, allowing manufacturers to switch between pure EVA, pure POE, and 3-layer EPE films on a single line with minimal downtime.

5. Market Outlook: Why Upgrade Your Production Capacity Now?

Market data indicates that the combined market share of POE and EPE films in China rose significantly to over 35%, with projections reaching over 50% market adoption. Driven by the rapid expansion of N-type solar cells, EPE is rapidly replacing pure EVA in dual-glass and bifacial module applications.

Investing in a high-flexibility co-extrusion line allows film manufacturers to capitalize on the lower production costs of EVA today while being fully prepared for the booming EPE demand tomorrow.

Partner with GWELL for Next-Generation PV Encapsulation Equipment

Whether you are upgrading an existing single-layer EVA line or establishing a new high-speed EPE co-extrusion facility, GWELL Machinery provides turnkey solutions tailored to your production goals.

• Custom Line Configurations: Widths from 1300mm to 2800mm; Output up to 1000 kg/h.

• Global Technical Support: On-site installation, formulation optimization guidance, and spare parts supply.

👉 Contact GWELL Engineers today to request a customized equipment quote or schedule a demonstration of our EPE Solar Film Co-Extrusion Line.

Contact Persons: Liam / Max
Email: saled@gwell.cn / salem@gwell.cn
Tel/WhatsApp (Liam): +86 15906224102
Tel/WhatsApp (Max): +86 15906227399