1. Coextrusion flows

1.1 The benefits of coextrusion flows

Coextrusion processes make it possible to combine, within a single product, the qualities of each of the constituent polymers (impact resistance, scratch resistance, aesthetic appearance, barrier properties), while achieving good adhesion between the different layers. In some cases, it can be as simple as using a layer of lower-quality recycled polymer between two layers of virgin polymer. Over the last few years, these processes have seen considerable development in the food packaging sector. Today, these products pose environmental problems due to the difficulty of dissociating the constituent polymers at the end of their life cycle with a view to recycling. From the initial configurations, which combined two products in two or three layers,...