Technical Specifications and Material Composition

Technical Specifications and Material Composition

 

Release films consist of three fundamental components: the base substrate, the release coating, and optional backside treatments. The substrate provides mechanical strength and determines most physical properties. PET films (12-250µm thick) dominate the market due to their excellent dimensional stability, clarity, and temperature resistance. PP films (25-150µm) offer better chemical resistance and flexibility, while PE films (50-200µm) provide economical solutions for less demanding applications.

The release coating chemistry is equally critical. Silicone-based coatings remain industry standard, offering excellent release characteristics and thermal stability. These are typically applied at 0.5-2.0 g/m² coating weights. Newer non-silicone alternatives (fluoropolymer or urethane-based) address specific needs like low-migration for medical applications or compatibility with certain adhesives.

 

Advanced films incorporate multiple functional layers:

 

Primer layers for coating adhesion

 

Differential release sides (different peel forces on each surface)

 

Anti-static treatments (surface resistivity 10⁶-10¹¹ ohms/sq)

 

UV or EB-cured coatings for solvent-free production

 

Technical specifications include:

 

Tensile strength: 100-300 MPa (PET), 20-40 MPa (PP)

 

Elongation at break: 50-150%

 

Thermal shrinkage: <1.5% at 150°C/30 min

 

Haze: <5% for optical clarity applications

 

Quality control measures ensure consistent coating uniformity (<±5% variation), controlled release force (±10% tolerance), and absence of defects like pinholes or coating voids. Modern production lines utilize precision coating technologies including gravure, micro-gravure, and slot-die coating methods.