Packaging material

Abstract

An embodiment of the present invention provides a packaging material including a bag body formed of a sheet in which to house a packaging target and a filter disposed at a vent of the bag body. The filter includes a porous film that is so disposed as to seal up the vent and prevents the entry of water and dust while permitting the passage of the air, and a dehumidification layer that is formed inside the porous film in such a manner as to cover the whole surface of the porous film and absorbs moisture that passes through the porous film to enter.

1 . A packaging material comprising:
 a bag body formed of a sheet that is hermetically sealed in packaging and houses a packaging target;   a vent formed in the bag body in order to make ventilation between inside and outside of the bag body when the packaging target is packaged; and   a filter disposed at the vent,   wherein the filter includes a porous film that is so disposed as to seal up the vent and prevent entry of water and dust while permitting passage of air, and a dehumidification layer that is formed inside the porous film in such a manner as to cover a whole surface of the porous film and absorb moisture that passes through the porous film to enter, and   wherein the air comes and goes through the filter, so that the air pressure difference between the inside and outside of the bag body is alleviated.   
     
     
         2 . The packaging material of  claim 1 , wherein the filter further includes a chassis having a first opening part on one end side that is exposed to the outside of the bag body and a second opening part on the other end side positioned inside the bag body, the porous film being at the first opening part,
 the chassis further having a net at the second opening part, the net permitting the passage of air, the dehumidification layer being between the porous film and the net.   
     
     
         3 . The packaging material of  claim 1 , wherein the filter further includes a chassis having a first opening part on one end side that is exposed to the outside of the bag body and a second opening part on the other end side positioned inside the bag body, the porous film being at the first opening part,
 the chassis further having a second porous film at the second opening part, the second porous film permitting the passage of air, the dehumidification layer being between the porous film and the second porous film.