The scheme of the process of co-extrusion is shown in Figure 3.1 , where the two layers after their co-extrusion into a single package at 300 C are cooled down by heat convection in the surrounding ...

A somewhat similar process is used for a tri-layer film (Figure 3.2). After co-extrusion under a very high pressure through a circular device, the bi-layer (or tri-layer) film shaped into a circular ...