| 摘要 |
PROBLEM TO BE SOLVED: To provide inner bags for bag-in boxes for a continuous filling machine which are relatively hard to stretch out and connected continuously via perforated lines that offers a cost merit. SOLUTION: An inner bag (31) for a bag-in box is a packaging box in a double bag form composed of two kinds of plastic films, which consists of a composite film (20) made of a base material film (17) and a sealant film (18), and a sealant film simple substance (19). The inner bags (31) are connected continuously via the perforated lines (a). On the inner bag (31), a face where a spout (13) is welded has such a film structure that a facing film is the composite film (20) made of the base material film (17) and the sealant film (18), and that a liquid-contact side film is made of the sealant film simple substance (19), and another face where the spout (13) is not welded has a film structure solely composed of the sealant film simple substance (19). COPYRIGHT: (C)2007,JPO&INPIT
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