both directions the use of hdpe would make this structure unusable due to its strong tendency to curl in the embodiments according to fig1 12 the evoh oxygen barrier layer 5 can be replaced by a polyamide layer or evoh and polyamide layers placed against each other can act as the oxygen barrier as in the structure shown in fig7 the embodiment according to fig1 comprises on the one side of the fibre base 3 the coextruded coc and ldpe layers 7 8 corresponding to fig9 and the mere ldpe layer 1 on the opposite side upon folding the packaging board according to fig1 the coc layer 7 can as well be on the exterior of the fibre base 4 as on the interior depending on the protection need of the product and the fibre base of any given time due to the amorphosity of the coc the material has no tendency to curl in fig1 there is seen an example of the carton package 12 of the invention which is formed by folding and heat sealing from a packaging blank made of the packaging board according to fig1 the board is located in the package 12 so that the exterior surface of the package outside the fibre base 3 is provided with superimposed coc and ldpe layers 2 1 so that the four layer coating 5 8 containing the evoh layer 5 remains inside the fibre base 3 in the.