Key Products Timeline 1946 First heat-sealing patents filed 1951 WINLINER® round-bottom bag 1956 CUBITAINER® 1958 HEDLINER® formed drum liner 1966 PAYLINER® formed pail liner 1966 TOPLINER® formed cradle/divider for steel pail 1966 HEDPAK® bottle 1967 HEDTAINER® 2SL bottle-in-drum 1973 HEDRUM® 55 gallon drum 1978 WINPAK® tight head pail (round) 1980 PAYLINER® for pressurized paint tanks 1993 WINLINER® Flat Seal Bag 1993 ECOSET® (licensed from Dr. Frohn) 2000 WINPAK® tight head pail (rectangular) 2008 Hedwin 70MM Screwcap