A lamination of three or more webs employing glue printers to provide a predetermined pattern of transverse stripes of adhesive on the webs and on the top and bottom surfaces of the assembled lamination after which the lamination is corrugated as it moves longitudinally into an accordion folded condition with the folded edges then being trimmed to provide an unexpected honeycomb core. The unexpected honeycomb core is then expanded to form a honeycomb core material.