JP3489610B2 - Method for producing container for preventing blister from bulging and homing mandrel used in the method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container for accommodating an inner bag mainly containing liquid or fluid powder, granules and the like inside an outer box.

[0002]

2. Description of the Related Art Conventionally, liquids used for commercial use, such as food additives such as soy sauce, vinegar and mayonnaise, or beverages such as mineral water are filled in a liquid container called a back-in-box and transported. There are many. This liquid container has a configuration in which a fluid container is filled in a flexible plastic inner bag and then housed in a paper outer box made of corrugated cardboard or paperboard.

When the liquid container is piled up during transportation or storage, the liquid or the like filled in the flexible inner bag deforms the inner bag due to the internal pressure of the liquid or the like, thereby pressing the side wall of the outer box. As a result, a blistering phenomenon occurs in which the body of the outer box bulges outward. In addition, since the liquid containers used for business use are filled with, for example, 10 liters and 18 liters of liquid, if a plurality of liquid containers are piled up, they cannot bear the weight of the liquids or are in transit. It has been pointed out that the side wall of the outer box is buckled from a portion having low rigidity due to vibration and impact applied to the inner box, and the inner bag is broken.

In order to solve such a problem, liquid containers described in JP-A-7-315436, JP-A-8-28735 and JP-A-9-40016 have been developed.

For example, as shown in FIG. 12, a liquid container described in Japanese Patent Application Laid-Open No. 9-40016 has a quadrangular outer box in which a body formed of corrugated cardboard or paperboard has four side plates. Is formed by fixing an octagonal inner frame member made of the same material inside, and one side of the inner frame member is slanted inside the corner portion of two adjacent side plates of the outer box. It has an attached configuration. An inner bag containing the liquid is stored inside the inner frame. The side surface of this container has a triple structure, the end surface has a double structure, and the hypotenuse surface has a single structure. Due to the different rigidity of each piece, the distance between the nodes is changed,
Moreover, measures are taken to weaken the rigidity of the four sides of the hypotenuse. The hypotenuse surface is slightly longer than the predetermined hypotenuse length (for example, 1
(07 mm → 110 mm), and is molded and fixed while applying compressive stress in the length direction during the folding process.

Therefore, when the internal pressure f is applied as shown in FIG. 13, an evenly distributed load acts between the nodes on the hypotenuse panel,
Since compressive stress is applied, it causes bending outwards, making it easier for the internal pressure to concentrate. In such a liquid container, when an internal pressure load f such as a liquid is applied in the direction of the arrow, inward stress is generated in the side plate of the outer box on the hypotenuse panel of the octagonal inner frame, and the body of the outer box is It is designed so as not to cause blisters. That is, the pressure distribution on the inner surface of the container is such that the hypotenuse part> the straight line side, the effect of increasing the inward stress generated at the nodes at both ends of the straight line side is generated, and the body part of the outer box does not bulge. By the way, when the length of the hypotenuse surface AB of the octagonal inner frame is L0, the length between AA of the outer box is α, and the length between B and B is β, L0 > Α,
The effect is high when there is a relationship of β (see FIG. 13).

[0007]

By the way, in the liquid container having the octagonal inner frame, a substantially triangular prism-shaped space is a dead space at a corner portion (hatched portion in FIG. 12) of a quadrangular outer box. Therefore, there is a problem that the packaging efficiency is not good. When compared with a thin iron plate container such as a can, a difference of about 30% is produced in the effective internal volume, which is a fatal problem of this kind of container.

The present inventor has, for the purpose of reducing the above-mentioned dead space, set the inner frame to be mounted inside the outer box to an n-sided polygon having eight or more sides, in other words, a polygonal side (close to a circle) as close as possible. According to the present invention, as a result of intensive studies, it is possible to realize a liquid container having a larger effective internal volume than the conventional one and capable of preventing the body swelling from being formed by a frame body composed of Reached

[0009] In Japanese Patent Laid-Open No. 8-82735, a quadrilateral outer box is equipped with a frame body of even n-sided polygons of 6 or more to prevent the container from being crushed or bulged by a load from above. A liquid container configured to be capable is disclosed. However, in the liquid container of the present invention, it was a precondition of the invention that the support plate serving as the reinforcing member and the n-shaped frame of the body part are separate from the outer box. In addition, the assembly and mounting of the polygonal frame body could be done manually rather than automatically. In short, the above invention is an invention in which the outer box and the polygonal frame cannot be assembled and mounted simultaneously and automatically on the same box manufacturing line.

Further, a plurality of folds (ruled lines) are preliminarily formed on the blank sheet constituting the liquid container, but if the folds are made in the blank sheet, the degree of moisture absorption of the sheet or the sheet folding The folds formed on the sheet may be inadvertently bent during the box making due to the influence of the rigidity of the sheet. If the folds do not fold in order and are inadvertently bent during the box making, it may cause machine troubles on the automatic packaging line.

In view of the above-mentioned conventional problems, the present invention allows the inner frame to be mounted inside the outer box to be of a polygonal type having eight or more sides, and the outer box and the inner frame. Assembling and mounting of a polygonal frame that prevents the occurrence of machine troubles by using a blank sheet that has been integrated with An object of the present invention is to propose a box-blown prevention container box making method capable of simultaneously and automatically making a box box and a frame box on the same box making line, and a homing mandrel to be used in the method. .

[0012]

Prior to specifically explaining the method of the present invention and the mandrel of the present invention, the barrel swell prevention container obtained by the present invention will be briefly described.

FIG. 1 is an exploded perspective view showing an example of a body swelling prevention container. An outer box A made of corrugated cardboard or paperboard having a pseudo-circular (approximately 12-sided) inner frame, and an inner box inside the outer box. It is composed of a flexible inner bag B made of plastic and accommodated therein. The above-mentioned inner bag is filled with a liquid used for business purposes, for example, 10 liters or 18 liters of liquid. FIG. 2 is a cross-sectional view of the outer box A. As shown in the figure, the side surface of this box has a triple structure, the end surface has a double structure, and the hypotenuse surface has a single structure. Due to the structure, the outer box and the inner frame are integrated in advance as described below. It is formed from a blank sheet of.

In the embodiment shown in FIG. 1 or 2, the inner frame has a 12-sided shape (a fold is formed at the center of the hypotenuse panel), but a 16-sided shape also has a 20-sided shape. But it's okay. In short, it is preferable to use a polygonal inner frame that is as circular as possible.

According to the present invention, front and rear left and right symmetrical side plates 2, 2, 3 and 3 are continuously provided on four sides of a rectangular bottom plate 1 as a center, and fold lines are provided on both sides of the left and right side plates 3 and 3. Inner frame forming panels 13a and 13b, which also serve as adhesive pieces, and the oblique side panel 1
3c, and the inner frame forming panels 13b, 13c using a corrugated cardboard or a paperboard blank sheet in which the inner frame forming panel 15 also serving as a butt portion is sequentially arranged on the outside.
Using a molding machine comprising a cylindrical homing die and a mandrel that descends from the top of the homing die after being bent upward by 90 degrees or more from the fold line 10 that forms a boundary with the adhesive piece 13a. When the blank sheet is pushed into the homing die by the method and four side plates 2, 2, 3 and 3 are vertically raised to form an outer box, an inner frame forming an octagon with a homing mandrel is formed. A protrusion is attached in advance in the height direction on the mandrel side of the portion of the member where the oblique face panel 13c is in contact, and the protrusion is crimped to the oblique face panel 13c of the inner frame. On the other hand, it is characterized in that a crease or a ruled line is formed by crimping the projection, or is formed in an arc shape. By the way, the inner frame forming panel 1
The engaging convex portion having a meshing relationship provided at the tip of 5 is not essential in the body swelling prevention container of the present invention.

In the present invention, the front, rear, left and right side plates 2, 2, which are pushed into the homing die and are connected to the bottom plate 1, are provided.
3 and 3 are raised in the vertical direction, and the left and right adhesive pieces 13a and 13b and the inner frame forming member 13c are bent inside the front and rear side plates 2 and 2, and the corresponding butting portions 1 at the tips of the inner frame forming members are bent.
5 Butt each other, and then, by using the homing mandrel by raising the front and rear side plates 2 and 2 in a direction perpendicular to the bottom plate 1, the protrusions mounted in the height direction on the mandrel side are While being crimped to the oblique side panel 13c of the frame, a crease or a ruled line is added to the oblique side panel or formed into a substantially arc shape, and the adhesive piece 13a and the front and rear side plates 2 and 2 are formed as shown in FIG. Are joined together to form a liquid container having a larger effective internal volume than that of the conventional one and capable of preventing body swelling.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 3 is a plan view of a blank sheet S (hereinafter simply referred to as a blank S) integrally provided with an inner frame member. The blank S is made of cardboard such as double-sided corrugated paper or paperboard.

First, the structure of the blank will be described. Reference numeral 1 is a bottom plate (2, 2) having a rectangular shape (including a square shape).
3, 3 are centered on the bottom plate 1, and folds 4 on four sides thereof,
It is a side plate of a rectangular shape which is continuously provided via 5 and which is symmetrical in the front-rear and left-right directions. Further, a lid piece 7 is continuously provided to the free ends of the front and rear side plates 2 and 2 through a fold line 6. The left and right side plates 3, 3
Inner frame forming pieces 13a and 13b which also serve as adhesive pieces and an inner cylinder forming piece 13c which is a hypotenuse panel are consecutively provided on both side sides of the inner folds 9 to 12 sequentially. And the inner cylinder forming piece 13
A butt portion 15 including a plurality of engaging protrusions 14 having a centering function is provided in series on the tip side of c.

Incidentally, the size and shape of the convex portion 14 are such that, when the inner frame forming pieces corresponding to each other are butted, a plurality of convex portions and concave portions provided on both of them are in mesh with each other, as will be described later. The shape and size are arbitrary. The left and right side plates 3 are provided with opening flaps 16 at their free ends.

Next, a method of making a box using the blank S will be described with reference to FIGS. As shown in FIG. 4, the blanks S conveyed and supplied one by one from a magazine (not shown) have the bonding paste g1 on the inner surface side of the second inner frame forming piece 13b by the hot melt guns M1 and M1 during the conveyance. Spray (see from Figure 4).

Next, as shown in FIG. 5, the first inner frame forming piece 13a, which also serves as an adhesive piece, and the second inner frame-shaped piece 13b are directed upward through the two consecutive folds 10. Bend 90 degrees,
Further, these are bent 180 degrees on the left and right side plates and crimped (see from FIG. 5).

Instead of applying the glue to the second inner frame forming piece 13b, it may be applied to the adhesive piece 13a. Note that the second inner frame forming piece 13b and the third inner frame forming piece 13 are replaced by the 90-degree bending and 180-degree bending press-bonding steps as described above.
c and 90 directly on the left and right side plates 3 via the folds 10.
It may be bent more than once. Further, the adhesive piece 13a and the second inner frame forming member 13b may or may not be adhered.

After that, as shown in FIG. 6, the blank S has the engaging projection 1 formed by the central hot melt gun M2.
The glue g2 is struck on the left and right side plates 3 from the valleys or the gaps of 4 and the glue g3 is also applied to the back surface side of the adhesive piece 13a through another hot melt gun M3 provided on the left and right (see FIG. 6). .

Next, the blank S is sent to a molding machine 50 (see FIGS. 10 and 11) comprising a cylindrical homing die 51 and a mandrel 52 descending from the homing die. In this forming machine, the blank S is pushed into the cylindrical homing die by the mandrel to form the bottom plate 1
The front, rear, left and right side plates 2 and 3 that are connected to each other are vertically raised (see FIG. 6).

At this time, the left and right side plates 3, 3 are raised vertically, and the left and right adhesive pieces 13a, the second inner frame forming piece 13b, and the third inner frame are provided inside the front and rear side plates 2, 2. While bending the forming member 13c through the fold line 9 and bending the third inner frame forming piece 13c from the fold line 12 of the abutting portion 15, the engaging convex portion 1 is formed on the left and right side plates 3 and 3.
Butt 4 so that they mesh with each other (see FIG. 6).

Then, as shown in FIGS. 7 and 8, while the protrusions 54 mounted in the height direction on the mandrel side are pressed against the oblique side panel 13c of the inner frame, the creases are formed on the oblique side panel 13c. Or add ruled lines. In this way, the inner frame becomes a dodecagon as a result of the folds being formed in the hypotenuse panel.

FIGS. 9A and 9B show the mandrel 52.
And a side view showing a projection 54 having a chevron cross section or a semi-cylindrical cross section attached to the height surface on the mandrel side. FIG. 9B shows the relationship between the projection 54 and the outer box A and the hypotenuse panel of the inner frame member. It is an explanatory cross-sectional view showing. This protrusion 54
As an example, wood or hard or soft rubber,
The protrusion 5 is attached to a portion where the mandrel 52 and the hypotenuse panel 13c of the inner frame forming member forming the octagon contact.
The base of No. 4 is fixed to the surface of the mandrel 52 with an adhesive or a pressure sensitive adhesive, but the protrusion may be made of metal and may be integrally bolted to the mandrel or attached by welding means or the like.

The vertices of the protrusions do not have to be acute-angled and may be curved. In addition, the cross section of the illustrated projection may be a half-moon shape, or a plurality of projections having a chevron cross section may be arranged and attached. In this case, a polygonal inner frame close to a circle of 12 sides or more can be formed.

Since the abutting portion 15 has a concavo-convex shape at the tip and has a relationship such that the two engage with each other, the inner frame members 13b, 13 are engaged when the protrusions and the recesses engage with each other.
Even if c is displaced to the left or right, it has a centering function that corrects the displacement, so that the abutting position does not change and is exactly aligned.

The tip shape of the abutting portion is not limited to the corrugated shape as shown in the figure, and the shape and size thereof such as trapezoidal shape and saw blade shape are arbitrary. The number of mountains or valleys is not limited to plural. It may be one. The abutting portion can be composed of an uneven portion formed of a curved line or a straight line. It is also possible to raise the peaks or deepen the valleys, or to increase the inclination. When doing so, it is easy to perform centering when the convex portion and the concave portion are engaged with each other.

As described above, according to the present invention, by pushing the blank into the cylindrical homing die by the mandrel, the inner frame forming member forming the octagon with the homing mandrel is formed when the outer box is made. Slope panel 13c
A protrusion is attached in advance in the height direction on the mandrel side where is contacted with, and the protrusion is crimped to the hypotenuse panel 13c of the inner frame, and the hypotenuse panel is folded by crimping the protrusion. The inner frame is integrally fixed to the inside of the outer box while giving a habit or ruled lines.

[0032]

According to the present invention, the inner frame to be mounted inside the outer box can be of a polygonal type having eight or more sides, and the outer box and the inner frame are previously integrated. It is possible to simultaneously and automatically perform the assembly and mounting of the polygonal frame body, that is, the box making of the outer box and the box making of the frame body by using the blank sheet which is used in the same box making line.

A blank usually has a plurality of folds (ruled lines)
However, the folds formed on the blank may be inadvertently bent during the box making due to the degree of moisture absorption of the blank and the rigidity of the blank when it is bent. If the folds are inadvertently bent during the box making, it may cause a machine trouble of the automatic packaging line, but according to the present invention, it is not necessary to engrave the folds in the oblique side panel,
It is effective in preventing the occurrence of machine trouble.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example of a body swelling prevention container.

FIG. 2 is a transverse sectional view of an outer box of the same container.

FIG. 3 is a plan view of a blank used for the same container.

FIG. 4 is an explanatory view showing a box-making method for a box using the same blank.

FIG. 5 is an explanatory diagram showing a box-making method for a box using the same blank.

FIG. 6 is an explanatory view showing a box-making method for a box using the same blank.

FIG. 7 is a perspective view showing a homing mandrel and a protrusion attached to the mandrel.

FIG. 8 is a partial explanatory view showing a homing mandrel and a protrusion attached to the mandrel.

FIG. 9A is a schematic side view showing a homing mandrel and a protrusion attached to the mandrel. (B) is a schematic explanatory cross-sectional view showing the relationship between the protrusion attached to the mandrel and the outer box and the inner frame member.

FIG. 10 is a schematic side view of a molding machine including a homing die and a mandrel descending from the homing die.

FIG. 11 is a schematic front view of a molding machine including a homing die and a mandrel descending from the top of the homing die.

FIG. 12 is a structural explanatory view of a liquid container.

FIG. 13 is an explanatory view showing the principle of preventing body swelling in the same container.

[Explanation of symbols]

1 bottom plate A few side plates 13a, 13b Inner frame forming panel 13c hypotenuse panel 51 Homing Die 52 Homming Mandrel 54 protrusions

─────────────────────────────────────────────────── --- Continuation of the front page (56) Reference JP-A-8-224806 (JP, A) JP-A-59-70556 (JP, A) JP-A-1-254541 (JP, A) JP-A-55- 149737 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) B31B 1/00-13/74 B65B 43/26-43/36

Claims (3)

(57) [Claims] 1. A rectangular bottom plate (1) is provided with side plates (2, 2, 3, 3) which are symmetrical in the front-rear and left-right directions continuously on four sides thereof, and folds are formed on both sides of the left and right side plates 3, 3. An inner frame forming panel (13a, 13b) that also functions as an adhesive piece, a hypotenuse panel (13c), and an inner frame forming panel (15) that also functions as a butt portion are sequentially connected to the outside in a corrugated board or paperboard blank. A sheet is used to bend the inner frame forming panels (13b, 13c) upward by 90 degrees or more from the fold line 10 that forms a boundary with the adhesive piece (13a), and then the tubular homing die and Using a molding machine composed of a mandrel descending from the top of the homing die, the blank sheet is pushed into the homing die by the mandrel and the four side plates (2, 2, 3, 3) are vertically raised and placed outside. Box making In doing so, a protrusion is attached to the mandrel side where the homing mandrel and the hypotenuse panel (13c) of the inner frame forming member forming the octagon are in contact, and the protrusion is attached to the hypotenuse of the inner frame. A method of making a container for preventing body swelling, which comprises press-fitting a face panel (13c) and forming a crease or a ruled line or forming into an arc shape by press-fitting the projection to the hypotenuse face panel. Wherein the front and rear symmetrical side plates on the four sides rectangular bottom plate (1) to the center (2,2,3,3) are continuously provided, also on both sides of the left and right side plates (3,3) , The inner frame forming panels (13a, 13b) that also serve as adhesive pieces, the hypotenuse panel (13c), and the inner frame forming panel (15) that also serves as a butt portion having a meshing relationship with each other at the tip end are sequentially connected to the outside through the folds. The inner frame forming panel (13b, 13c) using a corrugated cardboard or paperboard blank sheet provided
Is bent upward by 90 degrees or more from a fold (10) forming a boundary with the adhesive piece (13a), and then a molding machine including a cylindrical homing die and a mandrel descending from the homing die is provided. Use the mandrel to push the blank sheet into the homing die, 4
A slanted side panel (13c) of an inner frame forming member that forms an octagon with a homing mandrel when the outer boxes are formed by vertically raising the side plates (2, 2, 3, 3) in a vertical direction. A protrusion is attached to the side of the mandrel where is touched, and the protrusion is crimped to the hypotenuse panel (13c) of the inner frame, and a crease or ruled line is formed by crimping the protrusion to the hypotenuse panel. A box-making method for a container for preventing body swelling, which is characterized in that it is provided or molded into an arc shape. 3. A homing mandrel used in a molding machine comprising a cylindrical homing die and a homing mandrel descending from the top of the homing die, the inner frame forming member forming an octagon with the mandrel. A homing mandrel, which is provided with a protrusion having a mountain-shaped cross section, a semi-cylindrical cross section, or a semi-lunar cross section in the height direction on the mandrel side where the hypotenuse panel 13c contacts.