The present invention provides additive packages for polyolefins The additive packages of the present invention comprise at least one non-phenolic antioxidant and a hindered amine light stabilizer. 5 seconds, said at least one hydrocarbon or oxygenated hydrocarbon having an atmospheric boiling point in the range of \u221250 to 370\xb0 C. The printing plate has a degree of firmness, and thus, the printing plate can hold itself in a substantially cylindrical shape even if it is merely rolled in the air.