| Abstract: | An experimental study of sandwich foam coextrusion was carried out, using a sheet-forming die with a feedblock. Polymers used for the experiment were low-density polyethylene (LDPE) for the outer layers and ethylene–vinyl acetate (EVA), with the chemical blowing agent azodicarbonamide, for the foamed core component. The present study has shown that the cell size and its distribution in the foamed core and the mechanical properties of the sandwiched foam product can be controlled by a judicious choice of the thickness ratio of the core to skin components, the meltextrusion temperature, and the concentration of chemical blowing agent. |
