Liquid storage bag

Abstract

A standing-pouch liquid storage bag in which a bottom forming film folded in half is disposed with a crease provided on the upper end of the bottom forming film at a predetermined position of a bag sheet material folded in half with one side, a bottom side and an other side of the liquid storage bag are closed by heat sealing, and heat sealing is performed on a portion of the one side except for a given length from the upper end of the liquid storage bag to construct a bag main part, wherein at least the one side is cut so as to align one end of the bottom forming film with the side portion of the bag main part, so that the lower part of the liquid storage bag is narrower than the upper part of the liquid storage bag.

1 . A standing-pouch liquid storage bag in which a bag sheet material is folded in half with a folded side serving as one side of the liquid storage bag, a bottom forming film folded in half is disposed at a predetermined position between a front sheet and a back sheet of the folded bag sheet material with a crease provided on an upper end of the bottom forming film, a bottom side and an other side of the liquid storage bag are closed by heat sealing, heat sealing is performed on a portion of the one side except for a given length from an upper end of the liquid storage bag to construct a bag main part, an inlet opening for filling the bag main part with a liquid is provided on an upper side of the bag main part, the upper side of the bag main part is closed by heat sealing in a state in which the bag main part is filled with the liquid, and a liquid spout opening is formed by cutting an upper end of the bag main part to a portion having not been heat-sealed on the one side,
 wherein of the one side and the other side, at least the one side has a portion where the bottom forming film disposed between the front sheet and the back sheet of the bag sheet material exists and the one side is cut so as to align one end of the bottom forming film with the side portion of the bag main part, so that dimensions between both sides of the liquid storage bag are smaller on a lower part of the liquid storage bag than on an upper part of the liquid storage bag.