A process for making a layered product having a honeycomb core having cells filled with a foam material, the process comprising the steps of: (a) placing a first layer of an uncured, heat-expandable, foamable material on the top side of a central honeycomb core having empty cells, and placing a second...http://www.google.es/patents/US5569508?utm_source=gb-gplus-sharePatente US5569508 - Resin transfer molding with honeycomb core and core filler
Resin transfer molding with honeycomb core and core filler
