Self-standing bag and method of manufacturing the bag

Abstract

A self-standing bag (1) comprising a bag body (2), a spout (3), and a reverse-recessed frame (4), wherein the spout (3) is provided at the upper portion of the bag body (2) composed of body films (2c, 2c) and a bottom film (2d) folded down on the bottom portion in a reverse V-shape, and integrally formed with the reverse-recessed frame (4) starting at the upper edge (2b) toward both side edges (2a, 2a) of the bag body (2), the bag body has fusion bonding parts at the lower edges and a part of each side edge of the bag body (2) which are fusion bonded to each other so that at least the bottom film (2d) can be fixed to the body films (2c, 2c).

Description

TECHNICAL FIELD [0001] The present invention relates to a self-standing bag having a spout, and more particularly to a self-standing bag that is flexible and has good self-standing performance and high fixing strength of the spout, and also to a method of manufacturing the self standing bag. BACKGROUND ART [0002] Conventionally, self-standing bags for fluids in which a liquid is filled have been used mainly for refilling use, and little attention has been paid to the self-standing performance. Therefore, when the amount of the content has been decreased, the conventional self-standing bag loses its self-standing function because of bending at the upper portion of the bag. Particularly, a self-standing bag for a fluid may have a spout for pouring the content. In such a case, the upper portion of the bag becomes heavy and the self-standing performance may be considerably injured. In addition, the conventional self-standing bag having a spout has been formed by a method in which periph...

AI Technical Summary

Benefits of technology

[0012] The self-standing bag according to the present invention is flexible and has good self-standing performance, so that the bag functions as a self-standing packing bag and fulfills the self-standing performance until the contents are completely consumed upon use in spite that the spout is attached, and the bag can be disposed by rolling up the bag with a reduction in volume after the completion of use. Further, the self-standing bag is high in fixing strength of the spout to the bag. It is also possible to reinforce the joining strength. Therefore, the self-standing bag according to the present invention is easy to use, is excellent in strength as a packing bag, and is easy to reduce in volume in case of disposing the bag after the completion of use, which is suited to environmental protection. According to the method of manufacturing the self-standing bag of the present invention, the self-standing bag having the above-mentioned characteristics and particularly having an excellent seal strength of the bag body can be manufactured easily and securely.

Problems solved by technology

Therefore, when the amount of the content has been decreased, the conventional self-standing bag loses its self-standing function because of bending at the upper portion of the bag.

In such a case, the upper portion of the bag becomes heavy and the self-standing performance may be considerably injured.

Such a manual operation not only affects the mass-productivity, but also renders the fusion bonding between the spout and the sheets unsatisfactory, resulting in an insufficient strength of the bag body.

On the other hand, molded vessels naturally have a sufficient self-standing performance, but they cannot be reduced in size by folding at the time of disposal.

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