To provide an air-permeable packaging material having air permeability which is suitable for the storage of deoxidizers or the like.
The air-permeable packaging material, constituted in such a manner that at least an oil-resistant layer, an air-permeable base material layer, and an air-permeable heat-seal layer of which the air permeability according to Ohken method is 10 to 600 seconds are piled up from the external layer to the internal layer, keeps an air permeability adjusting layer piled up between the outside of the oil-resistant layer and/or the air-permeable base material layer and an air-permeable heat-seal layer for the air-permeable packaging material. In this case, the air permeability of the laminated material according to Ohken method is 10 to 800 seconds. By constituting the air-permeability adjusting layer by pattern printing, the air permeability can easily be adjusted.
TAKAZAWA NORIYOSHI
MINATO KAZUYUKI
MASUYAMA TOMOO
MITSUBISHI GAS CHEMICAL CO
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