JP5257156B2 - Liquid spouted bags and bag-in-box - Google Patents

Description

  The present invention relates to a spouted bag for containing a liquid. This bag relates to a bag applied to a so-called bag in box.

  FIG. 2 is a longitudinal sectional view of a commonly used bag-in-box. The bag shown in FIG. 2 is formed from a flexible material such as a plastic film. Further, the spout member (spout) shown in FIG. 2 has a flange portion, and the flange portion is attached to the inner surface of the bag. For this reason, as shown in the figure, the spout inlet is positioned inside the bag, and the spout outlet is positioned outside the bag. A liquid such as a syrup containing sugar is filled in a bag from a supply port (not shown), and then stored in an outer box made of cardboard or the like. As shown, the spout of the bag is positioned in a lower opening formed in advance in the outer box. If desired, the contents of the bag can be poured out from the outlet of the spout member through the spout through the spout and out of the outlet.

  FIG. 3 is a view similar to FIG. 2 after the contents have been poured out to some extent. As shown in FIG. 3, as the contents in the bag are poured out, the bag is gradually crushed so as to deflate in the direction of gravity due to its own weight. And if a bag is crushed to some extent, the inner surface of the bag which exists in the position facing a spout will stick to a spout member. In such a case, since the inlet of the spout is closed by the inner surface of the bag, a liquid pool is generated around the inlet of the spout, and the contents in the bag cannot be poured out to the end. In addition, even in a bag-in-box in which a spout is attached to the side surface of the outer box and the content liquid is sucked and poured out, there may be a problem that the spout pouring port is closed by the bag inner surface.

  With respect to this problem, Patent Document 1 proposes to provide an elongated member (immersion strip) extending to the spout along the inner surface of the bag. The elongated member is formed from a relatively hard material, and a groove extending along the elongated member itself is formed in advance in the elongated member. When such an elongated member is provided in the bag, the bag is prevented from being crushed by the elongated member even if the contents of the bag are poured out to a certain extent, and is positioned far from the inlet. The contents to be performed can be guided to the inlet. Accordingly, no liquid pool is generated around the spout inlet, and the contents in the bag can be poured out to the end. Note that Patent Document 2 describes a manufacturing method and a manufacturing apparatus for manufacturing a bag-in-box in which such an elongated member is arranged in a bag. Further, Patent Document 3 describes a spout provided with protruding elements for forming a plurality of passages extending radially around an inflow port. In the spout member of Patent Document 3, the contents of the bag flow into the inlet through the passage, so that the contents of the bag can be poured out to the end.

US Pat. No. 5,647,511 JP 2002-533232 A Japanese National Patent Publication No. 2-500831

However, in Patent Document 1 and Patent Document 2, a manufacturing process for newly installing an elongated member is added, and the elongated member is formed of a material harder than the flexible material forming the bag. Manufacturing costs also increase. Further, from the viewpoint of preventing the elongated member from piercing the bag, it is required that the elongated member is fixed and disposed inside the bag. For this purpose, as described in Patent Document 2, the size of the elongated member is considerably large. This is not desirable for bag-in-box manufacturers. Furthermore, in patent document 3, if the inner surface of the crushed bag blocks the spout, there is a problem that the contents in the bag cannot be poured out to the end. Therefore, a simple and inexpensive bag-in-box capable of pouring the contents in the bag to the end is desired.

  The present invention has been made under such background technology, and provides a simple and inexpensive bag with a spout for liquid that is easy to manufacture and can dispense the content liquid in the bag to the end. With the goal.

That is, the invention described in claim 1 includes a flexible front wall and a rear wall and a spout fixed to the front wall, and the front wall and the rear wall are overlapped to fix the peripheral edges to each other. In the bag with a spout for liquid, in which the outflow passage for pouring out the content liquid from the content liquid storage unit to the outside of the bag is provided in the spout,
The flexible rear wall is formed by stacking a plurality of flexible films and heat-sealing a part of them.
The liquid spout-equipped bag, wherein the plurality of flexible films are linearly heat-sealed to each other at a position facing the spout fixed to the front wall.

  In the present invention, the linear heat-sealed portion increases the strength of the rear wall, lowers its flexibility, and prevents deformation of the bag. And since this linear heat fusion part is provided in the position which opposes a spout, when a content liquid is poured out from this bag, a bag will change and this linear heat fusion part will be in the spout inner surface. Abut. Since the linear heat-sealing portion that is in contact with the inner surface of the spout is not easily deformed, it is possible to prevent the spout and the rear wall from being in close contact with each other and to secure an outflow path for the content liquid. For this reason, the content liquid in the bag can be poured out to the end.

  And according to this invention, since a special material is not required other than the flexible film which comprises the front wall and rear wall of a bag, and since it can manufacture in the adhesion process of these flexible films, manufacture is It is easy and can be manufactured easily and inexpensively.

  Next, the invention according to claim 2 is the bag with a spout for liquid according to claim 1, comprising a plurality of the linear heat-sealing portions. According to the second aspect of the present invention, since the plurality of the linear heat fusion portions are provided, the linear heat fusion portions are formed regardless of the deformation method when the content liquid is poured out from the bag. Makes contact with the inner surface of the spout, and the outflow passage of the content liquid can be reliably ensured.

  The invention according to claim 3 is the bag with a spout for liquid according to claim 2, wherein the plurality of linear heat-sealing portions are formed in parallel to each other. According to the second aspect of the present invention, since the plurality of linear heat-sealed portions are formed in parallel to each other, the longitudinal flexibility is reduced, and the outflow passage of the content liquid is more reliably performed. Can be secured.

Next, the invention according to claim 4 relates to a bag-in-box using the bag according to claim 1. That is, the invention according to claim 4 is a bag-in-box comprising an outer box and a bag containing the content liquid stored in the outer box.
The bag is composed of a flexible front wall and a rear wall, and a spout fixed to the front wall. An outflow passage for pouring out the content liquid from the content liquid storage part to the outside of the bag is a bag with a liquid spout that is provided in the spout,
The flexible rear wall is formed by superposing a plurality of flexible films and bonding a part thereof to each other,
A part of the plurality of flexible films, wherein the plurality of flexible films are linearly heat-bonded to each other at a position facing the spout fixed to the front wall. It is a featured bag-in-box.

  As described above, according to the present invention, it is possible to obtain a simple and inexpensive bag with a spout for liquid that is easy to manufacture and can dispense the content liquid in the bag to the end.

The top view of the bag with a spout for liquids of the present invention, and the sectional view in the A-A 'line Longitudinal sectional view of a conventional bag-in-box Longitudinal cross-sectional view of a conventional bag-in-box after some contents have been poured out

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view of a bag with a spout for liquid of the present invention and a cross-sectional view taken along the line A-A ′. The bag which concerns on this invention is comprised by the flexible front wall and rear wall, and the spout fixed to the said front wall. The flexible rear wall is formed by laminating a plurality of flexible films and adhering a part of them to each other. In the example of FIG. 1, the third layer film and the fourth layer film are formed. Corresponds to a flexible film.

In addition, the flexible front wall can be formed of a single film, but it is preferable that a plurality of flexible films are stacked without being bonded to each other. In this case, the content liquid does not leak even when the outer film is torn by piercing from the outer surface of the bag. In the illustrated example, the first front film and the second layer film constitute the flexible front wall.
The front wall and the rear wall are overlapped with each other and the peripheral edges are fixed to each other to constitute a content liquid storage portion. This fixing can be performed, for example, using an adhesive, but is preferably by heat sealing. This is because the peripheral edges of the front wall and the rear wall can be fixed simultaneously with the formation of the linear heat-sealed portion described later. Further, when the front wall is formed by folding a single film, it is also possible to fix the peripheral edge using the folding line.

  As described above, a spout is fixed to the front wall. A flow path (not shown) is provided inside the spout, and the flow path allows the content liquid to be poured by communicating the content liquid storage portion with the outside of the bag. The structure of the flow path and the structure that closes the flow path until the time of pouring are all known. When the front wall is composed of two films as shown in the figure, the spout is fixed to both of these two films, and both sides thereof (outside of the liquid container and the bag) Need to communicate with each other. The spout generally has a flange, and this flange is fixed by heat-sealing to the inner surface side of the front wall, that is, the content liquid storage portion. When the front wall is composed of two films, the spout flange can be heat-sealed by superimposing these two films. For this reason, a hole can be provided in the front wall, a spout can be inserted into the hole, and the front wall around the hole can be bonded and fixed.

Next, the rear wall is provided with a heat fusion part constituted by heat-sealing a plurality of flexible films constituting the rear wall. And this heat-fusion part has a linear shape. For this reason, it has resistance to the bending in the longitudinal direction. And the flexibility of the rear wall is reduced by the resistance. Since this linear heat fusion part is provided at a position facing the spout, when the content liquid is poured out from this bag, the bag is deformed and this linear heat fusion part comes into contact with the inner surface of the spout. In addition, it prevents the spout and the rear wall from sticking to each other and secures an outflow path for the content liquid.

This heat fusion part may be one, but it is desirable to have a plurality of heat fusion parts formed in parallel. In this case, resistance to bending in the longitudinal direction can be increased, and the flexibility of the rear wall can be reduced accordingly. In addition, since a plurality of lines are formed, the area where the heat-sealing part is located becomes large, and this linear heat-sealing part is formed on the inner surface of the spout regardless of how the liquid is poured out of the bag. By abutting, the outflow path of the content liquid can be ensured reliably. In addition to the plurality of linear heat fusion portions, a linear second heat fusion portion intersecting with the plurality of linear heat fusion portions may be provided. The second heat fusion part is desirably provided near the end of the plurality of linear heat fusion parts. A second heat fusion portion may be provided near one end of the plurality of linear heat fusion portions, or a second heat fusion portion may be provided at each of both ends thereof.
In addition, it is preferable that the width | variety of the said some linear heat-fusion part is a width | variety which covers the whole spout. Moreover, the length needs to be larger than a spout, for example, is 70 mm or more.

  Next, the manufacturing method of this bag is demonstrated.

  That is, first, a film constituting the front wall and a film constituting the rear wall are prepared. Any plastic film can be used as the film constituting the front wall and the film constituting the rear wall. For example, a polyethylene film, a polypropylene film, a polyester film, a polyamide film, and the like. Moreover, the multilayer film obtained by laminating | stacking two types of films can also be used, and the multilayer film which laminated | stacked metal foil on the plastic film can also be used. Preferably, it is a resin film that can be heat-sealed, or a film in which a resin layer that can be heat-sealed is formed on one or both sides. In this case, for example, the content liquid container can be formed by overlapping the front wall and the rear wall and heat-sealing at the periphery. It is also possible to configure an adhesive part that surrounds the airbag part by heat fusion.

  Then, a hole is formed in the film constituting the front wall, and a spout is inserted into the hole, and the front wall and the spout around the hole are bonded and fixed (spout fixing step). This adhesion is possible, for example, by heat sealing.

  In addition, a plurality of films constituting the rear wall are overlapped with each other and heat-sealed at a position where a linear heat-sealed portion is formed (linear heat-sealed portion forming step). The plurality of linear heat fusion portions can be collectively formed in a single process by passing a seal roll having a seal bar attached to a cylindrical roll. Further, the second heat fusion part can be formed at the same time.

Next, the content liquid container is formed by stacking the film constituting the front wall and the plurality of films constituting the rear wall and heat-sealing them at the periphery (content liquid container forming step). The content liquid is often filled using a spout,
It is also possible to fill from this opening by leaving an opening for filling the content liquid.

The liquid spout-equipped bag thus obtained can be used as a package for a bag-in-box, for example, by using a spout or containing the content liquid through the opening and closing the opening.

Claims (4)

It is composed of flexible front and rear walls and a spout fixed to the front wall, and the front wall and the rear wall are overlapped and the peripheral edges are fixed to each other to form a content liquid storage portion. In the bag with a spout for liquid, in which an outflow passage for pouring the content liquid from the section to the outside of the bag is provided in the spout,
The flexible rear wall is formed by stacking a plurality of flexible films and heat-sealing a part of them.
A bag with a spout for liquid, wherein the plurality of flexible films are linearly heat-sealed to each other at a position facing the spout fixed to the front wall.   The bag with a spout for liquid according to claim 1, comprising a plurality of the linear heat fusion portions.   The bag with a spout for liquid according to claim 2, wherein a plurality of the linear heat-sealing portions are formed in parallel to each other. In a bag-in-box consisting of an outer box and a bag containing the content liquid stored in the outer box,
The bag is composed of a flexible front wall and a rear wall, and a spout fixed to the front wall. An outflow passage for pouring out the content liquid from the content liquid storage part to the outside of the bag is a bag with a liquid spout that is provided in the spout,
The flexible rear wall is formed by superposing a plurality of flexible films and bonding a part thereof to each other,
A part of the plurality of flexible films, wherein the plurality of flexible films are linearly heat-bonded to each other at a position facing the spout fixed to the front wall. A featured bag-in-box.

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