Patent ID: 7464520
Filing Date: 2008-12-16
Classification: B31D,B65B,B65D

Abstract:
1. A manufacturing method for a packing member for packing an article, comprising: an overlapping step of overlapping flexible sheets; a medium accommodating portion forming step of sealing the sheets at a plurality of positions while they are overlapped to provide a plurality of medium accommodating portions arranged in the form of an array; a medium accommodating portion sealing step of sealing the sheets sealed by said medium accommodating portion forming step, at one longitudinal end of the packing member; a non-return valve mounting step of mounting a non-return valve to another longitudinal end of the packing member sealed by said medium accommodating portion forming step, wherein the non-return valve is effective to permit flow of the medium to each of the medium accommodating portions and to limit flow of the medium in an opposite direction, wherein the non-return valve is provided for each of the medium accommodating portions, wherein said non-return valve mounting step comprises the steps of: mounting a sealing portion of the non-return valve between the flexible sheets having a melting temperature above the melting temperature of the flexible sheets; sealing the flexible sheets in a direction crossing the longitudinal direction of the medium accommodating portions without sealing the portion of the flexible sheets located across the non-return valve sealing portion; and an introducing portion forming step of sealing the flexible sheets overlapped by said overlapping step at the one longitudinal end to form a plurality of introducing portions for permitting introduction of the medium into each of the medium accommodating portions, wherein each of the introducing portions is independently provided for each of the medium accommodating portions, wherein each of said introducing portions has an injection port configured and positioned to permit the introduction of the medium from outside of said packing member at an upstream end with respect to the direction of the introduction of the medium, wherein each of said injection ports has a width that is narrower than a connection portion between an associated non-return valve and its associated introducing portion provided downstream of its associated introducing portion with respect to the direction of the introduction of the medium, and wherein each of said injection ports is adjacent to another injection port.