The Science of Separation High-Quality Release Liners for Every Industry

What is a Release Liner?

A release liner is a specialized film designed with a meticulously treated surface. Its defining characteristic is an extremely low, or virtually non-existent, adhesive property when it comes into contact with specific materials under defined conditions. This unique feature is vital in countless manufacturing applications, acting as a protective barrier that prevents adhesives, resins, and other sticky substances from unwanted bonding with molds, processing equipment, or adjacent materials.

Engineered for Performance: Structure and Composition

Release liners are precisely constructed with a multi-layered design to deliver optimal functionality and performance:

• Substrate Layer: This forms the core structural element of the release liner. We utilize high-quality materials like PET, PBT (polybutylene terephthalate), and PENT (polyolefin elastomer). The chosen substrate directly influences the liner's mechanical properties and heat resistance, tailored to your application's demands.
• Primer Layer: Often composed of materials such as polyvinyl butyral (PVB), its primary role is to enhance the adhesion of the release agent to the substrate, preventing delamination and ensuring consistent release performance.
• Release Layer: The release layer, typically made from advanced materials like fluorine-containing silicone resin, polyurethane, or ionic liquids, dictates the liner's performance. The specific release agent type and the precision of its application directly control the peel force and residual adhesion rate—critical factors for your process efficiency.

Key Characteristics of Release Liners

Release liners are engineered for uncompromising performance, embodying a set of core characteristics:

• Engineered Surface Treatment

Release liners achieve their non-adhesive properties through precise surface modification. Common treatments include:

• Silicone coatings
• Fluorochemical coatings
• Plasma-enhanced surface activation

These surface technologies allow the liner to maintain consistent and controllable release force across various adhesive systems, including hot-melt, acrylic, and rubber-based PSAs.

• Thermal Resistance

Our release liners are designed to perform reliably under elevated temperatures, maintaining mechanical stability and dimensional integrity. This is especially important for processes involving heat lamination, die-cutting, or thermal curing.

• Chemical Inertness

The materials used in release liners are chemically stable, ensuring no unwanted interactions with adhesives, coatings, or substrates. This prevents contamination, discoloration, or degradation of functional materials.

• Mechanical Strength and Durability

Constructed from robust base films such as PET (polyethylene terephthalate), PE (polyethylene), and BOPP (biaxially oriented polypropylene), release liners exhibit:

• Excellent tensile and tear strength
• Resistance to puncture and deformation
• Smooth handling in high-speed production lines

Product Classification

By Substrate Material

• PET Release Liner
• PE Release Liner
• BOPP Release Liner
• Composite Liners

By Release Force

• Ultra-light (1-5 g/in)
• Light (5-20 g/in)
• Medium (20-60 g/in)
• Heavy (60-100 g/in)
• Ultra-heavy (>100 g/in)

By Functional Performance

• Single-/Double-sided liners
• Anti-static liners for electronics
• Optical-grade liners manufactured in cleanroom conditions
• Matte liners designed for FPC (flexible printed circuits)

Our Release Liners

PE Release Liner

PP Release Liner

PET Release Liner

PET Embossed Release Liner

At Alfa Chemistry, we are dedicated to providing you with advanced release liner solutions that not only meet but exceed your performance expectations. For technical specifications and consultation, please feel free to contact us.