STRUCTURE OF AIR VENT PASSAGE OF SEALED BAG, SEALED BAG, AND METHOD OF MANUFACTURING SEALED BAG

摘要

A structure of the air passage of a sealable bag used in a sealable bag 1 in which an airflow passing space 3a where a gas in discharging or charging flows is opened and closed, thereby allowing an airflow in the forward direction and inhibiting an airflow in the reverse direction, wherein facing bag sheets 11, 12, a valve sheet 31, and a spacer member 32 are provided. The valve sheet 31 has an attached part 31b upstream along the forward airflow F1 and a movable part 31c downstream along the same. The spacer member 32 is placed between the inner surface 11a, 12a of the bag sheet 11, 12 and the valve sheet 31, whereby a distance determined by the spacer member 32 is at least partly maintained between the inner surface 11a, 12a of the bag sheet 11, 12 and the valve sheet 31.