JP5845680B2 - Method for manufacturing outer box for bag-in-box - Google Patents

Description

  The present invention relates to an outer box of a bag-in-box in which a soft packaging bag filled with a liquid is contained in an outer box, and in particular, can be manufactured without requiring a special device, and is capable of carrying a load. The present invention relates to an outer box applied to a bag-in-box with a small residual liquid amount and a method for manufacturing the same.

  Conventionally, plastic containers (bottles) such as polypropylene resin (PP), polyethylene terephthalate resin (PET), or polyvinyl chloride resin (PVC) have been widely used as containers for storing various beverages, seasonings or liquid detergents. It was.

  However, the increase in waste in recent years has become a major social problem, and as a result, it has become a global environmental problem along with the problem of resource protection, energy saving and resource saving. It has come to be desired.

  In view of the above problems, environmentally-friendly liquid containers, in particular as business-use liquid containers with a large internal capacity (from 2 liters to 30 liters), a cardboard outer box, and soy sauce inside it Composite containers (hereinafter referred to as bag-in-boxes) containing plastic film-filled bags with spouts filled with liquid are known. For example, foods such as soy sauce, cooking oil, liquor, detergents, development Widely used as business-use liquid containers for storing liquids or the like (see, for example, Patent Document 1).

  FIG. 3 is a longitudinal sectional view of a commonly used bag-in-box. The bag (109) shown in FIG. 3 is formed of a flexible material such as a plastic film. Further, the spout member (spout) (102) shown in FIG. 3 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 content liquid (108), for example, a beverage such as syrup containing sugar, is filled in a bag from a supply port (not shown), and then stored in an outer box (100) made of cardboard or the like. As shown in the figure, the spout of the bag is positioned in a lower opening formed in advance in the exterior box. If desired, the contents of the bag can be drained from the outlet through the interior of the spout and the contents in the bag can be poured out.

  FIG. 4 is a view similar to FIG. 3 after the contents have been poured out to some extent. As shown in FIG. 4, as the content liquid (108) in the bag (109) is poured out, the bag is a sealed container and gradually collapses toward the stopper fixing side as the content decreases. . 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 (102) is closed by the inner surface of the bag, the contents in the bag cannot be poured out to the end.

  At this time, the remaining content in the bag tends to gather at a position in contact with the corner of the inner surface of the exterior box away from the spout, and when the spout is closed by the inner surface of the bag, much content remains without being poured out. There are many cases. A similar problem may occur even in a bag-in-box in which a spout is attached to the side surface of the outer box (100) and the content liquid (108) is sucked and poured out.

In response to the problem that the spout is closed by the inner surface of the bag when the content liquid is poured out, Patent Document 1 proposes to provide an elongated member (dip strip) extending to the spout along the inner surface of the bag. Yes. 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.

The method proposed in Patent Document 1 requires a step of providing an additional member, which is an elongated member, on the bag, and is difficult to realize with ordinary devices and methods. Also, pinholes may be caused by the contact of the elongated member with the bag. In addition, 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, but there is no change in that an additional process is necessary.
Even in the spout member proposed in Patent Document 3, it is said that the contents of the bag can be poured out to the end, but there is no change in that an additional step is required.
Therefore, a simple and inexpensive bag-in-box capable of pouring the contents in the bag to the end is desired.

A bag-in-box mainly using a cardboard outer box is used as a business liquid container having a large internal capacity (2 to 30 liters). In the field, it is necessary to increase the load resistance of the outer box.
Various devices have been made to increase the load resistance of the packaging box in fields other than the bag-in-box, and many proposals have been made to achieve this, especially by the shape of the corners of the side walls connected by plane intersections. .

In Patent Document 4, a recess is formed in a columnar shape at the corner of each side wall of a rectangular packaging box, and the weight of the mirror is sufficiently resisted by using a packaging box in which a mirror bowl (51) is taken out from the top of each depression. A packaging box that constitutes three sides by placing a cradle (53) that supports it stably has been proposed.
Here, the packaging box formed from one sheet of paper is folded inward so that the four vertical corners (52) are inward and concave from the outside, and the three sides (50) are assembled to give the required strength. The strength of the box itself is not a special issue. FIG. 5 shows a state in which the mirror bowl (51) is placed on the three-way cradle (53) assembled by opening the packaging box.

  In Patent Document 5, a projecting portion (61) is provided at each corner of a rectangular packaging box (60) to reinforce the box, classify the contents, and make up an external art decoration. A box has been proposed. Here, as shown in FIG. 6, the four corners are projected inward or outward as reinforcement of the box. However, the protruding part becomes an obstacle and the inner volume of the box cannot be used sufficiently or it is caught during operations such as transportation. There is also a problem that it is easy to do.

  In Patent Document 6, narrow chamfers are applied to the corners of the side wall (71) of the packaging box (70), and support reinforcing small pieces (75) and (76) are continuously provided at the upper and lower ends of the chamfered part (74). Thus, a box has been proposed in which the strength of the corner portion is increased by chamfering and the supporting strength of the bottom (73) and the lid (72) is increased by folding the supporting reinforcing piece inside the bottom portion or the lid portion. . The octagonal cross section chamfered at the four corners of the box increases the strength of the side walls and at the same time increases the strength of the bottom and the lid (see FIG. 7).

  In Patent Document 7, after cutting a single box member into a size corresponding to the shape of the box, a reinforcing portion (82) is formed by bending in a vertical direction at an appropriate location on the side wall (81) to form an inexpensive packaging box ( 80) has been proposed. In particular, the four corners of the box are bent and formed integrally. However, the protruding part obstructs the inner volume of the box, and it may get caught during operations such as transportation. There is a problem similar to Patent Document 5 that it is easy (see FIG. 8).

  Patent Document 8 proposes a bag-in-box box using a single sheet as an exterior box for a bag-in-box that is free from the occurrence of paper dust, insects, and foreign matter, instead of corrugated cardboard. This exterior box (90) is provided with a side reinforcing plate on the corner side surface (94) in order to compensate for the strength reduction due to the use of a single paper, and the strength is strengthened by an octagonal cross section design with four corners chamfered. (See FIG. 9).

US Pat. No. 5,647,511 JP 2002-533232 A Japanese National Patent Publication No. 2-500831 No. 2-335658 Japanese Utility Model Publication No. 47-28418 Japanese Utility Model Publication No. 53-19852 JP-A-51-59582 JP 2006-327601 A

  Based on the above circumstances, we propose a simple and inexpensive bag-in-box that is easy to manufacture, can achieve the required strength without the need for additional processes and equipment, and can reduce the residual content in the bag as much as possible. This is the subject of the present invention.

The invention according to claim 1 is a method of bonding cardboard subjected to printing, ruled line processing, and punching necessary for an exterior box, as a box body, bottom molding, filling contents in an inner bag, and to an outer box of an inner bag. The corners of each side wall of the rectangular packaging box are formed by the step of forming indentations in the shape of being folded inward so that the corners of each side wall are recessed from the outside after loading, packaging and discharging from the box making machine. is an inner folded shape of the recessed portion a method for manufacturing a packing case for bag-in-box you and forming the pillar-shaped such that from outside the concave corner.

According to the present invention, an ordinary folded quadrangular or octagonal box is formed by forming indentations in a shape that is folded inward so as to be concave from the outside at the corners of each side wall of the rectangular packaging box. Compared with the bag-in-box that not only has a novelty in appearance, but also can achieve the expected effect without interfering with handling compared to the case where protrusions etc. are provided on the outside of the outer box for strength complementation I can do it.

Furthermore, by forming the dent in a columnar shape, the load resistance of the outer box is improved, and it is easy to prevent damage due to handling such as transportation and transportation without adding special materials or processes. Become. Not only that, the retention of the inner bag during transportation is improved, which leads to prevention of broken bags.

According to the present invention, it is possible to reduce the amount of remaining liquid when the contents are poured out by providing columnar portions that are convex when viewed from the inside at the corners of each side wall. Hereinafter, description will be given with reference to the drawings.
FIG. 1 is a schematic external view of an outer box for a bag-in-box according to the present invention.
FIG. 10 is a schematic external view of the package using the outer bag for a bag-in-box according to the present invention as seen from the direction with the spout in front when the contents are poured out. FIG. 11 is a schematic external view of the bag-in-box outer box of the present invention as seen from the spout direction after the contents have been poured out to some extent.

As shown in FIG. 1, the bag-in-box outer box of the present invention has a structure in which columnar recesses are formed by pushing the corners of the four side walls of a rectangular box inward. By providing this columnar recess, not only the load bearing performance of the outer box is improved, but also the swinging of the inner bag during transportation can be suppressed to prevent the inner bag from breaking. .
As shown in FIG. 10, when the packaging body using the bag-in-box outer box (10) of the present invention is viewed from the direction facing the spout (102), a columnar shape is formed inside the outer box (10). The presence of the convex portion (21) of the inner bag (109) suppresses the rotational oscillation during transportation of the inner bag (109) filled with the contents (108).

  Furthermore, the outer box for a bag-in-box according to the present invention is also effective in reducing the amount of residual liquid that cannot be poured out when the contents are poured out and eliminating the waste of the contents. The contents remaining in the inner bag as the contents are poured out tend to collect on the peripheral edge away from the spout portion of the inner bag. As indicated by the arrows, the peripheral edge of the inner bag rides on the columnar convex portion, and the residual liquid at the peripheral edge approaches the central spout portion. Thereby, the contents in the inner bag can be effectively poured out.

In addition , by forming the recessed portion of the outer box after the inner bag is inserted into the outer box, the inner bag can be easily inserted into the outer box, and there is no fear that the inner bag will be caught and broken during insertion.

In addition , corrugated cardboard that has undergone printing, ruled line processing and punching required as an outer box, bonding as a box, bottom molding, filling the contents of the inner bag, loading the inner bag into the outer box, sealing the outer box Since the normal process only includes the step of forming indented parts in the shape of being folded inward so as to be recessed from the outside at the corners of each side wall after discharging from the box making machine, the manufacturing method is particularly expensive and It does not take time and it is not necessary to introduce expensive equipment.

  As described above, according to the present invention, manufacturing is easy, the required strength can be achieved without the need for additional processes and devices, and the remaining contents in the bag can be reduced as much as possible. A simple bag-in-box.

Appearance example of the outer box for bag-in-box of the present invention Example of development of outer box for bag-in-box of the present invention Longitudinal cross-sectional schematic view of a conventional bag-in-box Longitudinal cross-sectional schematic view of a conventional bag-in-box after some contents have been poured out Appearance example of conventional mirror packaging box Appearance example of a conventional decorative box with a reinforced structure Appearance example of conventional high strength packaging box Appearance example of conventional packaging box Example of external appearance of a conventional bag-in-box outer box using single paper Schematic external view as seen from the front side of the spout when the package using the bag-in-box outer box of the present invention is poured out Example of schematic external view of bag-in-box outer box according to the present invention as seen from the spout direction after a certain amount of content has been poured out

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic external view of an outer box for a bag-in-box according to the present invention. FIG. 2 is a development example of the outer box for a bag-in-box according to the present invention.
As shown in FIG. 1, the bag-in-box outer box of the present invention has a structure in which columnar recesses are formed by pushing the corners of the four side walls of a rectangular box inward. This outer box can be produced by assembling cardboard as shown in FIG.

  The outer box (10) for a bag-in-box according to the present invention has a columnar recess (21a), (21b), (21c) provided with vertical inner folding lines (18a), (18b), (18c), (18d). , (21d) and the lateral outer fold line (20) on the lower side of the four side walls (12a), (12b), (12c), (12d) connected to each other through the vertical outer fold line (19). The bottom wall pieces (13a), (13b), (13c), (13d) are extended through the side walls (12a), (12b), (12c), (12d) and the bottom wall pieces (13a). , (13b), (13c), and (13d) form a box by pasting together with the adhesive piece (17), and each side wall (12a), (12b), (12c), (12d) A lid piece (15) is extended to one side wall (12c) via a lateral outer fold line (20) on the upper side And the remaining three side walls (12a), (12b), (12d) are extended with flap pieces (14a), (14b), (14d) to form an outer box, and the outer boxes are folded vertically inward. By pushing the lines (18a), (18b), (18c), (18d) inward, the depressions (21a), (21a), (21a), (12d) at the corners of the side walls (12a), (12b), (12c), (12d) 21b), (21c), and (21d) are outer boxes for bag-in-boxes formed in a column shape.

  The recess is usually formed before the inner bag is inserted into the outer box, but it may be formed by pushing the columnar recess after the inner bag is inserted into the outer box. In this case, since the inner bag filled with the contents is inserted when there is no unevenness on the inner surface of the outer box, it can be inserted smoothly.

  The filling of the content liquid is often performed using a spout, but it can also be filled 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 using a spout or containing the content liquid through the opening and closing the opening.

As a material for the outer box for a bag-in-box according to the present invention, it can be appropriately selected from general corrugated cardboard as long as it has necessary strength that varies depending on the amount of contents.
The inner bag used together with the outer box for bag-in-box according to the present invention is a bag composed of front and rear walls made of a flexible film, and a spout fixed to the front wall.

The front wall and the rear wall are overlapped with each other and the peripheral seal portion is fixed to each other to constitute a content liquid storage portion. A spout is fixed to the front wall. A flow path is provided inside the spout, and the flow path allows the content liquid to be poured out by communicating with the outside of the content liquid storage portion bag. The structure of the flow path and the structure that closes the flow path until the time of pouring are all known.
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.

A well-known technique can be used for the material and manufacturing method of an inner bag.
As the film constituting the front wall and the film constituting the rear wall, ordinary plastic films can be used. 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 side 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 made 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. This adhesion is possible, for example, by heat sealing.
The liquid spout-equipped bag thus obtained can be used as, for example, an inner bag for a bag-in-box by using the spout or containing the content liquid through the opening and closing the opening.

<Example 1>
As the inner bag of the bag-in-box, a film of linear low-density polyethylene (thickness 100 μm) polymerized using a single-site catalyst with a density of 0.925 g / cm ³ and a melt index of 2.0 g / 10 min. And a 570 mm × 570 mm four-sided seal type inner bag fitted with a screw type spout.

After filling 18 liters of distilled water with a liquid temperature of 75 ° C. from the spout of the inner bag using a dedicated filling machine, this bag is used for 18 liters of K7 specification and size of 305 L × 295 W × 260 H for FIG. Example 1 was formed by forming the inner fold lines at the four corners inward and forming the columnar dents in the corrugated cardboard outer box (before pushing the columnar dents).
After transporting the package of Example 1 by truck, distilled water was poured out from the spout, but neither the outer box nor the inner bag was deformed or broken, and there was almost no distilled water remaining in the inner bag. The dispensing has been completed.

<Example 2>
As the inner bag of the bag-in-box, a film of linear low-density polyethylene (thickness 100 μm) polymerized using a single-site catalyst with a density of 0.925 g / cm ³ and a melt index of 2.0 g / 10 min. And a 570 mm × 570 mm four-sided seal type inner bag fitted with a screw type spout.

After filling 18 liters of distilled water with a liquid temperature of 75 ° C. from the spout of the inner bag using a dedicated filling machine, this bag is used for 18 liters of K7 specification and size of 305 L × 295 W × 260 H for FIG. The inner fold lines at the four corners shown in FIG. 6 were housed in a corrugated cardboard outer box (after the columnar dents were pushed) formed by folding inwardly to form columnar dents.
After transporting the package of Example 2 by truck, distilled water was poured out from the spout, but neither the outer box nor the inner bag was deformed or broken, and there was almost no distilled water remaining in the inner bag. The dispensing has been completed.

<Comparative Example 1>
As the inner bag of the bag-in-box, a film of linear low-density polyethylene (thickness 100 μm) polymerized using a single-site catalyst with a density of 0.925 g / cm ³ and a melt index of 2.0 g / 10 min. And a 570 mm × 570 mm four-sided seal type inner bag fitted with a screw type spout.

After filling 18 liters of distilled water with a liquid temperature of 75 ° C. from the spout of this inner bag using a dedicated filling machine, this bag is used for 18 liters of K7 specification and size of 305 L × 295 W × 260 H for 18 liters. It was stored in a corrugated cardboard outer box as Comparative Example 1.
After transporting the package of Comparative Example 1 by truck, distilled water was poured out from the spout, but the outer box was slightly deformed and the inner bag was also scratched. At the time of dispensing, distilled water remained in the periphery of the inner bag.

The packaging body of Example 1 and Example 2 is a cardboard that has been subjected to printing, ruled line processing and punching necessary as an exterior box. The usual process of loading into the outer box and sealing the outer box only includes the step of forming indented parts in the shape of a column that is folded inward so as to be recessed from the outside at the corners of each side wall after discharging from the box making machine. Therefore, the manufacturing method is not particularly expensive and time consuming, and it is not necessary to introduce expensive equipment.
For example, it is not necessary to use a box making machine using a special structure such as a mandrel winding method, and the box can be made by a normal cardboard box making machine, so that the equipment cost can be reduced.

  As described above, according to the present invention, manufacturing is easy, the required strength can be achieved without the need for additional processes and devices, and the remaining contents in the bag can be reduced as much as possible. A simple bag-in-box.

DESCRIPTION OF SYMBOLS 10 ... Exterior box 11 ... Corrugated cardboard 12a, b, c, d ... Side wall 13 ... Bottom wall 13a, b, c, d ... Bottom wall piece 14a, b, d ... Flap piece 15 ... Cover piece 16 ... Spout Fixing part 17 ... Paste pieces 18a, b, c, d ... Inner fold line 19 ... Outer fold line 20 ... Outer fold line 21 ... Columnar dents 21a, b, c, d ... Columnar dents 50 ... Three-way 51 ... Mirrors 52 ... 4 vertical corners 53 ... cradle 60 ... packaging box 61 ... projecting part 70 ... packaging box 71 ... side wall 72 ... lid 73 ... bottom 74 ... chamfered part 75 ... lid supporting reinforcing piece 76 ... bottom supporting reinforcing piece 80 ... packaging box 81 ... Side wall 82 ... Reinforcement part 83 ... Cover 90 ... Exterior box 91 ... Bottom plate 92 ... Rear plate 93 ... Front plate 94 ... Corner side plate 95 ... Paste piece 96 ... Handle hole 97 ... Folding piece 98A ... For fixing the spout Hole 98B ... Outlet fixing hole 99A ... Top plate 99B ... Top plate 102 ... Spout 1 8 ... the liquid content 109 ... the inner bag 100 ... exterior box

Claims (1)

Bonding as a box, bottom molding, filling the contents of the inner bag, loading the inner bag into the outer box, sealing the outer box, and making the box After discharging from the machine, the step of forming indented parts that are folded inward so as to be recessed from the outside into the corners of each side wall is recessed from the outside into the corners of each side wall of the rectangular packaging box. A method for manufacturing an outer box for a bag-in-box, wherein the indented concave portion is formed in a columnar shape.

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