What are the main differences between a Virgin Resin grade and a Standard grade CPP?
Virgin Resin (VR) grade CPP film materials contain no regrind or repro other than edge trim directly produced in the extrusion process. Standard grade (S) CPP film materials contain varying levels of regrind and repro depending upon the specific film product. A VR grade CPP will tend to have a lower gel count than a S grade CPP and for that reason may be more suitable for gel sensitive lamination applications. The regrind and repro materials used in Copol S grade CPP film products are only generated internally within the manufacturing process and are fully compatible with the prime resin materials used to produce the film. Apart from a somewhat higher natural gel count, S grade CPP film materials have similar mechanical and optical properties to those of VR grade CPP films. Both VR and S grade CPP film materials are FDA compliant for food packaging applications.
