What is the difference between Monolayer Extrusion and Co-Extrusion?
Monolayer Extrusion: A single extruder is used to form the desired shape, and the characteristics are uniformly dispersed throughout the overall thickness of the profile. Co-Extrusion: Co-Extrusion uses two layers of PVC, the Cap-Stock, and the Substrate Layer. The cap stock contains a denser concentration of essential elements, such as UV inhibitors. Westech’s profiles conform to the ASTM Specification F964-94 requiring that the cap stock layer be a minimum of 0.015″ thick and a maximum of 20% of the overall thickness of the profile wall. Substrate Layer: The Substrate Layer, or inner layer, is essentially that same as the cap stock layer, but with a lowered concentration of UV inhibitors and color pigment. This allows for a better molecular bond by the impact modifiers in the substrate compound, resulting in a stronger product.
