Packing method, packing member and manufacturing method therefor

A packing method for packing an article, using a packing member which includes a plurality of medium accommodating portions for accommodating media arranged in the form of an array, a non-return valve for passing a medium to each of the medium accommodating portions and stopping the medium away from each of the medium accommodating portions, wherein the non-return valve is provided for each of the medium accommodating portions, and an introducing portion for introducing the medium into each of the medium accommodating portions with the non-return valve from an outside of the packing member to balloon each of the medium accommodating portions, said method comprising:

• a step of accommodating the article in the packing member;
• a step of introducing the medium into each of the medium accommodating portions through the introducing portion independently provided for each of the medium accommodating portions after said accommodating step;
• and then
• a step of sealing the introducing portion disposed upstream of the non-return valve with respect to a direction of the introduction of the medium from the introducing portion toward the non-return valve after said step of introducing the medium, for sealing each of the introducing portions to prevent the medium from leaking to an outside of the packing member,
• wherein each of the introducing portions has an injection port for permitting the introduction of the medium from an outside of the packing member at an upstream end of the packing member with respect to the direction of the introduction, and wherein the injection port has a width which is narrower than a connecting portion between the non-return valve and said introducing portion provided downstream of the introducing portion with respect to the direction of the introduction, and wherein the injection ports contact each other.