Fecha de publicación: 05/11/2012 Fuente: WIPO "abeja" A method for making a composite panel (10), wherein the composite panel (10) has a honeycomb core (14) sandwiched between a pair of facing sheets (12), includes the steps of (a) coating the interior walls of the cells (18) with a unexpanded thermo-expandable material; (b) bonding a pair of facing sheets (12) to the opposite sides of the honeycomb core (14); and (c) heating the honeycomb core (14) while the honeycomb core (14) is sandwiched between the pair of facing sheets (12) with sufficient heat to cause the thermo-expandable material to expand and to substantially fill the cells (18).