Packing material

Abstract

A packing member for packing an article, the packing member includes a medium accommodating portion accommodating medium; a non-return valve for passing the medium toward the medium accommodating portion along a longitudinal direction of the medium accommodating portion and for stopping the medium in an opposite direction away from the medium accommodating portion; and a flow path, formed by welding the non-return valve to the medium accommodating portion, for passing the medium, the flow path including a reference flow path portion extending in the longitudinal direction and an expanding flow path portion having a width larger than that of the reference flow path portion.

1 . A packing member for packing an article, said packing member comprising:
 a medium accommodating portion accommodating medium;   a non-return valve for passing the medium toward said medium accommodating portion along a longitudinal direction of said medium accommodating portion and for stopping the medium in an opposite direction away from said medium accommodating portion; and   a flow path, formed by welding said non-return valve to said medium accommodating portion, for passing the medium, said flow path including a reference flow path portion extending in the longitudinal direction and an expanded flow path portion having a width larger than that of said reference flow path portion.   
     
     
         2 . A packing member according to  claim 1 , further comprising a regulating portion which is provided downstream of said flow path with respect to a flow direction toward said medium accommodating portion and which is formed by welding said non-return valve to said medium accommodating portion, said regulating portion having a width larger than that of said reference flow path portion, said regulating portion being effective to change a flow direction of the medium having passed through said flow path to a widthwise direction of said medium accommodating portion. 
     
     
         3 . A packing member according to  claim 1 , wherein said non-return valve includes two flexible sheets and welded to said medium accommodating portion, and the medium is flowable between said two sheets. 
     
     
         4 . A packing member according to  claim 1 , wherein said non-return valve includes one flexible sheet welded to said medium accommodating portion, and the medium is flowable between said flexible sheet and said medium accommodating portion. 
     
     
         5 . A packing member according to  claim 1 , wherein a plurality of such said expanded flow path portions arranged in a direction crossing with the longitudinal direction in said flow path. 
     
     
         6 . A packing member according to  claim 1 , wherein a plurality of such said expanded flow path portions arranged in the longitudinal direction in said flow path. 
     
     
         7 . A packing member according to  claim 1 , wherein a plurality of such flow paths are arranged in a direction crossing with the longitudinal direction.