JP2002128144A - Bag-in-box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bag-in-box showing a superior complete consumption of stored content in the bag by a method wherein an inner bag of the bag-in-box is prevented from being formed with a lateral folding line or wrinkles when the stored content (liquid and the like) is discharged out of the bag-in-box. SOLUTION: This container provides a bag-in-box for attaining the aforesaid purpose, wherein a bag for the bag-in-box having a pouring inlet is stored inside an outer box as an inner bag, and a bottom of the inner bag and an inner surface of the bottom are fixed to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bag-in-box used for storing and transporting liquid products (beverages, car oils, detergents, etc.) in various fields such as the food industry, the car industry and the toiletry industry. About. More specifically, the present invention relates to a bag-in-box having excellent useability of contents (liquid product).

[0002]

2. Description of the Related Art In recent years, bag-in-boxes, which are disposable so-called one-way containers, have been widely used for transporting and storing various liquids such as beverages such as seasonings, liquor and mineral water, and industrial chemicals. I have.

[0003] This bag-in-box uses a foldable bag or container made of plastic such as a flat bag obtained by sealing a plastic film as an interior or an integrally molded product obtained by blow molding a molten plastic. , An outer box such as a cardboard box is provided in the inner bag,
The structure is such that the interior plastic bag or container has water resistance, chemical resistance, gas barrier property, and the like for the content liquid, while the exterior has the rigidity required for transportation and storage. The bag-in-box constructed in this way does not require collection as compared with conventional glass bottles and tin cans, which helps to save labor and cost.In addition, because it is foldable, transport and storage of empty containers is easy, and distribution costs are reduced. It has advantages such as being able to be achieved.

However, when the conventional bag-in-box as described above is actually used, the following problems may occur.

As shown in FIG. 15, when the contents (liquid, etc.) are discharged from the bag-in-box, the bag-in-box 150 is usually fixed upside down and the inner bag 151 is fixed.
The contents are discharged from a spout 154 that is installed above and protrudes from the outer box 152. In such a state, the inner bag is fixed to the outer box only at the position of the spout, so that the inner bag is crushed in the direction of gravity by the weight of the contents as shown in FIG.

In such a case, when the contents are discharged, the inner bag 151 in the bag-in-box naturally withers, and as shown in FIG. Wither in the same direction as the pouring direction, the direction of gravity. Therefore, a large number of folds and wrinkles extending in the horizontal direction are formed in the inner bag 151, and they are further overlapped. Needless to say, the folds and wrinkles cause the discharge of the contents to be difficult, and moreover, a liquid pool is formed on the wrinkles and the like, and in many cases, the contents cannot be completely used. Was.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has an object to discharge contents (liquid, etc.) from a bag-in-box. An object of the present invention is to provide a bag-in-box excellent in the reusability of contents by preventing the formation of wrinkles and wrinkles.

[0008]

In order to achieve the above object, according to the present invention, a bag body for a bag-in-box having a spout is housed in an outer case as an inner bag. A bag-in-box, wherein the inner bag bottom is fixed to the inner surface of the outer box bottom.

Since the bottom of the inner bag for the bag-in-box is fixed to the inner surface of the bottom of the outer box, the bag-in-box can be used upside down to discharge the contents (liquid) even when the bag-in-box is used upside down. Since the bottom of the bag is held on the inner surface of the bottom of the outer box, it is possible to prevent the bag from shrinking while crushing in the direction of gravity. And, by preventing collapse in the direction of gravity, the inner bag does not form a fold or wrinkle extending in the lateral direction, and does not hinder the discharge of the contents. Can be.

[0010] In the first aspect of the present invention, as described in the second aspect, it is preferable that the inner bag is a gusset bag formed to be a cube or a rectangular parallelepiped when the contents are filled. .

The inner bag for the bag-in-box is a gusset bag formed to be a cube or a rectangular parallelepiped when the contents are filled, so that the inner bag follows the internal shape of the outer box having the shape of a cube or a rectangular parallelepiped. It is easy to fit inside the outer case, and there is very little wasted space between the outer case and the inner bag, so the inner bag is difficult to move in the outer case, preventing rupture due to impact and rubbing due to rubbing. This is because it is possible to impart characteristics other than the disposability of the contents.

Each corner of the gusset bag is surrounded by one of the top sealing portion and the bottom sealing portion, the side sealing portion and the closing sealing portion, so as to be integrated with the closing sealing portion. It is preferable that a triangular fin is formed on the fin. Since the internal space of the triangular fin portion is completely closed from the internal space of the bag body by the closing seal portion, the contents filled in the bag cannot enter therein. Therefore, when the gusset bag is stored in the outer box, even if each corner having the triangular fin portion is bent, the residual liquid does not accumulate in the corner and the residual liquid discharge property of the bag-in-box is reduced. Further, since the closed seal portion formed integrally with the triangular fin portion has an effect of dispersing stress against impact, the impact resistance of the gusset bag can be improved. Because it can be.

According to the first or second aspect of the present invention, as described in the third aspect, the inner bag bottom and the outer case bottom inner surface are at least four corners of the outer case bottom inner surface. It is preferable that the bottom of the inner bag and the inner surface of the bottom of the outer case are fixed on the entire inner surface of the bottom of the outer case.

A feature of the present invention is that the bottom of the inner bag for the bag-in-box and the inner surface of the bottom of the outer box are fixed as described above. When the bag-in-box is used upside down by fixing the inner bag bottom and the inner surface of the outer box bottom, the inner bag bottom is held on the inner surface of the outer box bottom (hanging state). Therefore, even if the contents are discharged, the inner bag can be prevented from being crushed in the direction of gravity, and the reusability of the bag-in-box can be improved.

Here, the reusability of the bag-in-box depends on the folds and wrinkles formed in the inner bag when the contents are discharged, and it is preferable that the folds and wrinkles are not formed. The disposability is improved. Therefore, it is desirable to discharge the contents in a shape in which the contents are filled in the inner bag (for example, in the case of the gusset bag provided in claim 2 above, the shape is a cube or a rectangular parallelepiped). Since it is preferable to hold (hang) the inner bag with as large an area as possible, it is preferable to fix the inner bag at least at four corners, particularly at the entire surface.

In the first to fourth aspects of the present invention, the inner surface of the bottom of the outer case may include a lower end portion of a side surface of the outer case. For example, when the outer box is a rectangular parallelepiped, the inner bag may not be fixed to the bottom of the outer box, but may be fixed to the lower end of the inner surface of the side surface adjacent to the bottom of the outer box.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below.

The bag-in-box according to the present invention comprises: a bag-in-box bag having a spout as an inner bag; and an outer box for storing the inner bag. It is characterized by being fixed to the inner surface of the box bottom. Hereinafter, the above items (1) to (4) will be specifically described with reference to the drawings.

A bag for a bag-in-box provided with a spout as an inner bag First, one of the components of the bag-in-box of the present invention will be described.
Next, a bag-in-box bag having a spout as an inner bag will be described.

A. FIG. 1 is a perspective view showing a folded state of a flat bag which can be used as a bag-in-box bag of the present invention, and FIG. 2 can be used as a bag-in-box bag of the present invention. It is a front view which shows the state which folded the gusset bag. FIG. 3 is a perspective view showing a state in which the contents are filled in the gusset bag shown in FIG. The shape of the bag used in the bag-in-box of the present invention is not particularly limited as long as the bag has a spout, and any bag can be used.

In the present invention, the shape of the spout is not particularly limited, and may be any shape as long as the contents filled in the bag can be poured out.

However, when the flat bag 101 of FIG. 1 is stored in an outer box, that is, by fixing the bottom surface of the flat bag and the inner surface of the bottom of the outer box, the flat bag 101 is crushed in the direction of gravity. It is possible to prevent the folds and wrinkles from being formed, and to improve the reusability of the bag-in-box. However, as shown in FIG. 22 may occur, and the corner 4 of the inner bag may bend to follow the inner shape of the outer box. Then, the outer box 21 and the inner bag 10
When the useless space 22 is generated between the inner bag 1 and the inner bag 101, the inner bag 101 becomes easy to move inside the outer box, and when a large impact such as dropping is applied to the bag-in-box, the inner bag bursts or vibrates. When a small impact such as is applied, the inner bag may be rubbed, scratched, and broken.

Therefore, the inner bag used in the present invention is shown in FIG.
And a gusset bag as shown in FIG.

The gusset bag 201 as shown in FIG. 2 is generally a cube or a gusset bag except for the presence of the triangular fin portion 11 when filled with contents (liquid or the like) as shown in FIG. It is a rectangular parallelepiped. In the case of the gusset bag 201 shown in FIGS. 2 and 3, the gusset bag 201 is substantially a rectangular parallelepiped.

As shown in FIGS. 2 and 3, the gusset bag 201 has a pair of opposing flat portions 2, 3 constituting the front and rear sides of the bag and a valley fold line folded inward in a folded manner. 6 is a four-side sealed bag body having two side portions 5 formed so as to include a top seal portion 7, a bottom seal portion 8 and a side seal portion 9 on the periphery of the bag body, and Each of the corners 4 of the bag body has a closing seal portion 10 and a triangular fin portion 11.

Each flat portion and each side portion are square or rectangular, and in the case of the gusset bag 201, the flat portions 2, 3
And the side parts 5 are all rectangular. The bonding for forming the top seal portion 7, the bottom seal portion 8, the side seal portion 9 and the closing seal portion 10 is usually performed by a heat sealing method. By bending and forming a film for forming the bag body, a part of the top seal part 7, the bottom seal part 8, and the side seal part 9 can be omitted. The gusset bag 201 is provided with a spout C similar to the inner bag (flat bag type) for the bag-in-box shown in FIG.

B. Regarding the material and structure of the bag The material of the bag used as the inner bag in the bag-in-box of the present invention described above is not particularly limited in the present invention, and the content of the contents to be filled in the bag is not particularly limited. The material can be arbitrarily selected depending on the type. For example, when the content to be filled is drinking water, a gas barrier property, a light shielding property, and the like can be imparted.

A gusset bag (201 in FIGS. 2 and 3) suitable for use as the inner bag of the bag-in-box of the present invention described above will be described below.

FIG. 5 schematically shows a horizontal cut surface of the gusset bag 201 of the present invention in a filled state. In the gusset bag 201 shown in FIGS. 2 and 3,
The plane portions 2 and 3 and the side surface portion 5 are formed of at least two synthetic resin films that are superimposed on each other in a non-bonded state, and may have a shock-absorbing structure. Thus, in the present invention, the structure of the inner bag used can be a double structure.

Here, "formed by at least two synthetic resin films which are superposed" means that a plurality of synthetic resin films are separated or are superposed in a separable state. Say that
As such a structure, for example, a structure that is superimposed in a non-bonded state as shown in FIG. 5 can be exemplified. Further, as another example, a laminated structure in which the bags are quasi-bonded with an adhesive strength enough to be peeled off after the start of use of the bag can be exemplified. The pseudo-adhered film is easy to handle during the bag manufacturing stage.

Referring to FIG. 5, the front flat portion 2 will be described by way of example. The flat portion 2 is formed of an outer film 2-a and an inner film 2-b. -A and 2-b are adhered, and in the other unadhered portions, a space 1 is provided between the two films.
There are six. However, both films have side seal portions 9
And other parts other than the seal parts may be locally adhered. Each film may be a single layer film as in 2-b or a composite film as in 2-a.

The material resin and thickness of each synthetic resin film or each layer in the film are appropriately determined in consideration of the properties of the contents and various conditions such as the strength required for the bag. Generally, the outer film 2-a or the outer layer 2-a1 of the outer film is determined with emphasis on performance such as strength and abrasion resistance required in relation to the external environment. Regarding 2-b or the inner layer of the inner film (not present in 2-b), emphasis is placed on performances such as water resistance, chemical resistance, gas barrier properties and sealing properties required in relation to the internal environment. Is determined. Further, in the relationship between the outer film 2-a and the inner film 2-b or between the inner layer 2-a3 of the outer film and the outer layer (not present in 2-b) of the inner film,
It is preferable to select a combination that improves the sliding between the two as much as possible.

For example, the flat portion 2 of the bag body 201,
3 and the side portion 5, the outer film 2-a is a composite film, and its layer configuration [outer layer 2-a1 / middle layer 2-a2 / inner layer 2-a3] is a 15 μm stretched nylon (ON). / 20 μm polyethylene (PE) / 60
μm linear low density polyethylene (LLDPE).
On the other hand, the inner film 2-b is a single-layer film,
μm LLDPE film.

Other specific examples include (1) an outer film [from the outer side to the inner side, a 15 μm polyvinylidene chloride coated ON layer (K coated ON) / 20 μm P
E / 60 μm LLDPE] and inner film [60 μm
LLDPE], (2) Outer film [12 μm metallized polyethylene terephthalate layer (VMPET) / 1
5 μm ON / 20 μm PE / 60 μm LLDP
E] and inner film [60 μm LLDPE], (3)
Outer film [15 μm ON / 20 μm PE / 60
μm LLDPE ・ ON ・ LLDPE co-extruded film] and inner film [60 μm LLDPE ・ ON ・ L
LDPE co-extruded film] or (4) outer film [15 μm ON / 20 μm PE / 60 μm LLDPE / ethylene-vinyl alcohol copolymer (E
VOH) · LLDPE co-extruded film] and inner film [60 μm LLDPE / EVAL / LLDPE co-extruded film], (5) outer film [30 μm LL
DPE / 15 μm ON / 30 μm LLDPE] and inner film [60 μm LLDPE], (6) outer film [12 μm silica-deposited polyethylene terephthalate layer / 15 μm ON / 20 μm PE / 60 μm L
LDPE] and inner film [60 μm LLDPE],
(7) Outer film [12 μm alumina-deposited polyethylene terephthalate layer / 15 μm ON / 20 μm P
E / 60 μm LLDPE] and inner film [60 μm
LLDPE], (8) Outer film [30 μm LL
DPE / 15 μm ON / 30 μm LLDPE] and the inner film [60 μm LLDPE].

In the above example, ON is used for improving strength.
PE is effective for abrasion resistance, and K coat ON, V
MPET and EVOH are effective in improving barrier properties. The method (3) is particularly suitable when it is desired to improve the strength.

At least one layer in the synthetic resin film may be a metal foil layer such as an aluminum foil. The metal foil layer makes the light shielding property of the bag extremely high,
In addition, the shape retention of the bag body is enhanced, which contributes to the improvement of self-sustainability. Therefore, it is effective when the light shielding property of the outer box is not so good or when the inner bag is taken out of the outer box for use.

In the gusset bag 201, FIG.
As shown in the figure, a bag 2 at the time of filling is provided at each corner 4 of the bag body.
It is preferable that a closing seal portion 10 is formed in order to make the shape of the fin 01 as close as possible to a cube or a rectangular parallelepiped and to form a triangular fin portion 11 at each corner 4. The closing seal portion 10 is provided under a state where the bag body is folded such that the pair of flat portions 2 and 3 overlap and the two side portions 5 provided with the valley fold lines 6 are interposed between the two overlapping flat portions. That is, under the condition shown in FIG.
It is formed by bonding the inner surfaces of the opposing bag bodies in a linear band shape from an arbitrary position P of any one of the top seal portion and the bottom seal portion to an arbitrary position Q of the side seal portion. .

As described above, the gusset bag 201 at the time of filling is used.
In order to make the shape as close to a cubic or rectangular parallelepiped as possible, the arbitrary position P is preferably as close as possible to the intersection of the top seal part 7 and the bottom seal part 8 with the valley fold line 6. For this reason, the arbitrary position P is normally provided within a range of ± 1 cm from the intersection of the top seal part 7 and the bottom seal part 8 with the valley fold line 6, preferably on the intersection.

Further, from a viewpoint similar to the above, each of the closing seal portions 10 present at each corner portion 4 has a positional relationship between the right side and the left side of the gusset bag, the front side and the rear side, and the top side and the bottom side. It is preferred that certain closure seals be as symmetrical as possible.

From the viewpoint that the bag 201 at the time of filling has a shape as close as possible to a cube or a rectangular parallelepiped, the closing seal portion 10 is formed so that the triangular fin portion 11 has a shape as close as possible to a right-angled isosceles triangle. Preferably, it is formed. For this purpose, a narrow angle m (m1, m2) sandwiched between any one of the top seal portion and the bottom seal portion and the closing seal portion, and a narrow angle n sandwiched between the side sealing portion and the closing seal portion. (N1, n2) is usually 30 to 6
0 °, preferably 40-50 °, particularly preferably m = n = 4
5 °. From such a viewpoint, m2 = n2 = 45 ° is adopted on the bottom side of the gusset bag 201.

Each corner 4 of the gusset bag is provided with one of a top seal 7 and a bottom seal 8,
By being surrounded by the side seal portion 9 and the closing seal portion 10, a triangular fin portion 11 is formed integrally with the closing seal portion 10. Since the internal space of the triangular fin portion 11 is completely closed from the internal space of the bag body by the closing seal portion 10, the contents filled in the bag cannot enter therein. Therefore, when storing the gusset bag 201 in the outer box, even if each corner 4 where the triangular fin portion 11 is formed is bent,
Residual liquid does not accumulate in the corners, so that the residual liquid discharging property of the bag-in-box can be improved. Further, the above-mentioned closing seal part 10 formed integrally with the triangular fin part is
Since there is an effect of dispersing stress on impact, the impact resistance of the gusset bag can be improved.

The inner surfaces of the bag body facing each other in the triangular fin portion 11 may not be bonded, but may be continuously bonded to the bonding portion of the closing seal portion 10 as shown in FIG. Good. In this case, there is no space inside the fin portion 11. Further, the inner surfaces of the fin portions 11 may be partially or intermittently bonded instead of the entire surface.

The triangular fin portion 11 is an unnecessary portion, and this portion jumps up or bends in an unspecified direction, thereby complicating the handling of the bag. For example, the manufacturing process of a bag-in-box (for example, a process of filling an inner bag with liquid or a process of storing an inner bag in an outer box)
When the outer case of the bag-in-box is removed and the inner bag is used, the triangular fin portion 11 becomes an obstacle. In order to eliminate such complexity in handling, preferably, as shown in FIG. 6, opposing vertices R of the front and rear corners of the bag body are bonded to each other. By doing so, not only does the triangular fin portion 11 become an obstacle, but also the bag wall of the portion in which the upper and lower surfaces of the outer box are filled with contents due to the interposition of the triangular fin portion 11 is formed. Since direct contact is eliminated, rubbing, tearing, or pinholes of the bag due to vibration or the like can be prevented.

In bonding the vertices R to each other,
The vicinity may be further bonded. For example, the opposing top seal portions 7 or the bottom seal portions 8 on the front side and the rear side of the bag body may be continuously or discontinuously bonded to the bonding portion of the vertex R. When the vertexes of the corners are bonded to each other, a bonding device used for forming each seal portion of the bag body can be used.

By bonding the opposing top seal portions 7 or the bottom seal portions 8 on the front side and the rear side of the bag body to the bonding portion of the vertex R continuously or discontinuously,
A pair of left and right hanging portions may be formed on the top or bottom side of the bag. When the hanging portion is formed, the bag can be hung by inserting a hand or a mechanical hand into the space between the fin portion and the body, so that the bag can be moved or the contents can be discharged. It is convenient. Especially in the bag manufacturing process, a heavy bag after filling can be lifted by a mechanical hand and put into the outer box, which saves labor by reducing the number of personnel and improves environmental hygiene by introducing an aseptic filling system. This is advantageous.

The bonding portion formed continuously or discontinuously with the bonding portion at the vertex R to form the hanging portion may be a band-shaped sealing portion, a circular shape, an elliptical shape, or the like. Point seals such as squares (spot seals)
It may be.

By using the gusset bag as described above as the inner bag used in the bag-in-box of the present invention, the inner bag is adhered to the inner surface of the bottom of the outer box. It is preferable that the inner bag itself can be prevented from collapsing and collapsing, and that the inner bag itself can be further prevented from collapsing and collapsing in the direction of gravity by improving self-reliance.

Next, an outer box that is one of the components of the bag-in-box of the present invention will be described similarly to the inner bag described above.

As the outer box for enclosing the bag-in-box bag as described above, a conventionally used bag-in-box outer box can be used. Or it is preferably a rectangular parallelepiped. Since the shape of the outer box is a cube or a rectangular parallelepiped and the inner bag is a gusset bag as described above, the inner bag fits well into the outer box, and damage to the inner bag due to rubbing can be prevented. It is.

A typical cardboard box as an outer box for a bag-in-box is a cardboard box, but if this is used, paper dust may come out and adhere to the outer surface of the inner bag or scatter around the bag-in-box. . In this case, a container made of a material such as plastic that does not emit paper powder may be used.

A durable outer box such as a plastic container can be collected and reused without discarding. The reusable outer box is preferably of a foldable type, and is suitable for enclosing a small-capacity (10 liter or less) inner bag, which is often used by taking out the inner bag from the outer box. . In some cases, the foldable container does not have good light-shielding properties. In such a case, it is preferable that the inner bag is a bag made of a synthetic resin film having at least one layer of a metal foil such as an aluminum foil.

An opening for projecting the spout of the inner bag is required on the wall surface of the outer box. Therefore, usually, an opening assisting means such as a perforation is provided on a wall surface of the outer box,
The opening is opened at the start of use using the opening assisting means. The opening formed by the opening assisting means preferably has a size that allows the bag body around the spout to be sufficiently pulled out when the spout is projected.

FIG. 7 shows a bag-in-box in which the outer box provided with such opening assisting means and the bag-in-box bag of the present invention are combined. As shown in FIG. 7A, the outer box 41 of the bag-in-box is provided with opening assisting means 43 for opening a spout on one surface. As the opening assisting means, for example, a tear tape or the like can be exemplified in addition to the perforation shown in the figure. Although not shown, the bag body for a bag-in-box of the present invention is housed inside the outer box 41, and its spout is located immediately below the opening assisting means 43 to be an opening. The spout is not secured to the outer box, as it must be pulled out of the opening after opening. The material of the outer box is not particularly limited, and for example, corrugated paper or the like can be used.

As shown in FIG. 7B, when the above-described bag-in-box is opened, an opening 44 is formed. The shape of the opening is not particularly limited, and examples thereof include a circle, an ellipse, a square, a hexagon, and an octagon.
The diameter d of the opening 44 is large enough to draw out the spout C with the cap CP and the bag body around the spout. When the spout and the bag body around the spout are sufficiently pulled out from the opening as described above, the periphery of the spout becomes a funnel type, and the folds and wrinkles around the spout are reduced. Therefore, the remaining liquid easily collects at the spout, and the drainage is smooth and has little pulsation. Further, since the spout can be handled as if it were the tip of a hose, the outflow direction of the contents can be controlled. Further, it is easy to confirm the residual liquid amount near the spout.

The length e of the bag body around the spout to be drawn out from the opening is preferably 50 mm or more.
It is preferably set to 0 mm or more. On the other hand, even if the length e is made longer than a certain value, it does not mean that it becomes convenient as much as the length e, but rather, the spout becomes obstructive and the diameter d of the opening needs to be extremely large. Therefore, the length e of the bag body pulled out from the opening is preferably 150 mm or less, and particularly preferably 100 mm or less. The specific size of the diameter d from which the bag body 1 around the spout can be pulled out by 50 mm or more, preferably 50 to 150 mm, should be determined as appropriate, but usually,
If the diameter is set in the range of 50 to 150 mm, the bag body can be pulled out to a just length. Here, "diameter" means
If it is circular, it means the diameter; if it has any other shape, it means the minor axis.

According to the opening assisting means 43 shown in FIGS. 8A and 8B, the wall surface of the outer box 41 can be radially torn from the position to be the center point of the opening, and the opening after opening is opened. A fan-shaped fragment 45 remains around the portion 44. In this case, the bag body 1 pulled out from the opening is a fan-shaped piece 45.
The position of the spout C is stabilized because it is pressed down or supported by the nozzle.

FIGS. 9A to 9C show an example of the bag-in-box comprising the outer box 41 provided with the opening assisting means 43 as described above and the bag-in-box bag of the present invention. As shown in FIG. 9A, the top of the outer box 41 has a pair of inner flaps 46, 46 and outer flaps 47, 47. The inner flaps 46, 46 are cut out in a substantially arc shape so as not to hinder the pulling out of the spout C of the inner bag stored in the box and the bag body around the spout. When the inner flaps 46, 46 are closed, a substantially semicircular cutout is formed. Further, one of the outer flaps 47 is provided with an opening assisting means 43 at a position where the spout C contacts. If the inner flaps 46, 46 and the outer flaps 47, 47 are sequentially closed, and then the outer box is sealed without fixing the spout to the outer box, a bag-in-box as shown in FIG. 9B is completed. . Then, the opening 44 having a predetermined size can be opened by using the opening assisting portion 43 of the bag-in-box, and as shown in FIG. 9C, the spout C and the bag body around the spout are pulled out. be able to.

The outer box may be combined with a four-sided sealed bag made by sealing a synthetic resin film such as a flat bag as the inner bag. Even in the case of a bag-in-box composed of such a combination, the remaining liquid can be reduced, pulsation at the time of outflow can be prevented, and the outflow direction can be controlled by pulling out the spout and the bag body around the spout from the opening. In addition, the visibility of the remaining liquid amount can be improved. In addition,
A part of the seal portion formed around the bag body of the four-side seal can be omitted by bending a synthetic resin film.

Fixing the Inner Bag Bottom and Outer Box Bottom Inner Surface The bag-in-box of the present invention is characterized in that the inner bag bottom and the outer box bottom inner surface described above are fixed. is there.

As shown in FIG. 10A, since the bottom of the inner bag 101 for the bag-in-box and the inner surface of the bottom of the outer box 21 are fixed, the bag-in-box can be used upside down. Even when the contents (liquid) are discharged, the inner bag bottom is fixed to the inner surface of the outer box bottom, so that it is possible to prevent the inner bag from shrinking while crushing in the direction of gravity (FIG. 10 ( B)). Reference symbol S in FIG. 10 indicates a fixed portion between the inner bag 101 and the inner surface of the bottom of the outer box 21. By preventing collapse in the direction of gravity, the inner bag does not form a fold or wrinkle extending in the lateral direction and does not hinder the discharge of the contents, so that the contents can be used up to the end. .

Here, the bottom of the inner bag generally means a spout C
Means the bottom part of the inner bag when the part with the mark is the upper part. In the present invention, the inner bag bottom portion is the same as the above concept, and a portion that comes into contact with the bottom portion of the outer box or the lower end of the inner surface of the side surface of the outer box when stored in the outer box with the spout C as the upper portion. Say. In the present invention, any portion may be used as long as it is the above portion, but specifically, a portion of about 40% from the lower end of the inner bag in the entire length of the inner bag, preferably 25% is good.

Further, in the present invention, the inner surface at the bottom of the outer box refers to the inner surface of the portion opposite to the surface where the spout C of the inner bag is installed when the inner bag is stored. It is similar to the concept. Therefore, in the present invention, the inner surface of the outer box bottom for fixing the inner bag bottom surface is not limited to the bottom surface of the outer box, and may include the lower end portion of the inner surface of the outer box side surface. For example, when the outer box is a rectangular parallelepiped, the inner bag may not be fixed to the bottom of the outer box, but may be fixed to the lower end of the inner surface of the side surface adjacent to the bottom of the outer box.

In the present invention, when the bag-in-box is used upside down, the inner bag is held on the inner surface of the bottom of the outer box (that is, the inner bag is suspended). Thus, it is sufficient that the inner bag bottom and the inner surface of the outer box bottom are fixed, and the fixing method and the like are not particularly limited.

As a fixing method, it is preferable that the bottom of the inner bag is directly fixed to the inner surface of the bottom of the outer box.
Adhesion is simple and preferred. The present invention is not particularly limited as to the adhesive used for the bonding, but, for example, a hot melt adhesive or the like can be suitably used. The adhesive to be used can be arbitrarily selected depending on the material of the inner bag and the material of the outer box.

The location for fixing the inner bag to the inner surface of the bottom of the outer box is not particularly limited to the present invention, and the inner bag is fixed to the inner surface of the bottom of the outer box as described above. The inner bag and the inner surface of the outer case bottom are preferably fixed at at least four corners of the inner surface of the outer case bottom, and the entire surface of the inner surface of the outer case bottom may be fixed. It is particularly preferred that they are fixed at.

FIG. 11 is a bottom view of the inner surface 50 at the bottom of the outer box. For example, as shown in FIG.
In the case of adhering to the outer box bottom surface 50,
It is preferable to adhere at the corners (portion 51).
Furthermore, it is particularly preferable to bond the entire surface of the outer box bottom surface 50 including these four corners. The disposability of the bag-in-box depends on the folds and wrinkles formed in the inner bag when the contents are discharged, and the disposability is improved when the folds and wrinkles are not formed. . Therefore, it is desirable to discharge the contents in a shape in which the contents are still filled in the inner bag (for example, in the case of the gusset bag, a cubic or rectangular parallelepiped).

As described above, the inner surface of the outer case bottom may include the lower end portion of the inner surface of the outer case side surface adjacent to the outer case bottom inner surface. Therefore, in the example of FIG. 11, the inner bag is not bonded at the four corners (portion 51) of the outer case bottom surface 50, and is attached to the inner surface of the outer case side surface portion adjacent to the outer case bottom surface 50. Also in the case of bonding at positions near the vertices of the four corners of 50, it can be said that the bonding has been performed at the four corners of the inner surface of the bottom of the outer box. Also, when the inner bag is bonded to the entire bottom surface of the outer box 50 and the lower end of the inner surface of the side surface of the outer box adjacent to the bottom surface 50 of the outer box, it can be said that the inner bag is bonded to the entire inner surface of the bottom of the outer box.

Here, the “four corners of the bottom of the outer box” are relatively different depending on the size of the outer box.
The general concept of, that is, around the four corners on the bottom of the outer box, may be a little more than the center of the bottom of the outer box, or the lower end of the inner surface of the side of the outer box Is also good. The distance from the vertex of each of the four corners is 0 to 30% of the length of each side
The region up to may belong to at least “the four corners of the bottom surface of the outer box”. For example, as shown in FIG. 11, when the inner surface of the bottom of the outer box is a square having a side length of 50 cm, the radius of each vertex is 0 cm to 15 cm with respect to each vertex.
"The four corners of the bottom of the outer box". 30% distance from each vertex
If it is larger, it is difficult to hold the inner bag in a shape close to the shape when the contents are filled (see reference numeral 51 in FIG. 11).

In bonding the inner bag and the outer box, the present invention does not particularly limit the procedure, and any procedure may be used as long as the inner bag and the outer box are bonded. As a general method, (1) a method in which the inner bag is stored in an outer box before the inner bag is filled with the contents and bonded at that time, and (2) a method in which the inner bag is filled with the contents. A method of storing the inner bag in the outer box and bonding the inner bag at that time is considered. In the present invention, the latter (2) is preferable. Before the inner bag is filled with the contents, the inner bag is in a folded state, and it is difficult to adhere to the inner surface of the bottom of the outer box in such a state. However, even with the former method (1), if the bottom of the inner bag is expanded by expanding the inner bag in advance, it is possible to adhere to the outer box before filling the contents. It is.

On the other hand, for example, when the above-mentioned gusset bag is used, when the contents are filled, the gusset bag has a cubic or rectangular parallelepiped shape and has some degree of independence. At this time, it is easy to bond the gusset bag and the inner surface of the outer box bottom. In this case, the adhesive can be easily adhered by applying an adhesive to the four corners of the bottom surface of the gusset bag and storing it in an outer box before it dries.

The present invention is not limited to the above embodiment. The above embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and has the same effect. Within the technical scope of

For example, the present invention does not particularly limit the size of the bag-in-box, nor does it particularly limit the use and the type of contents.

In the above description, the position of the spout C provided in the inner bag is the upper end of the inner bag. However, in the present invention, the position of the spout is not particularly limited.
Therefore, as shown in FIG. 12, it may be installed above the side of the inner bag 101, and in this case, it is preferable to fix the bottom of the inner bag and the bottom of the outer box at the portion S shown in FIG.

[0074]

Examples are shown below.

(Example) A gusseted bag-type inner bag having the shape shown in FIG. 2 (FIG. 3) was prepared. This bag has a capacity of 20 liters and has a flat portion and side portions made of a dry laminated film of [stretched nylon (ON) 15 μm / linear low-density polyethylene (LLDPE) 60 μm] and a 60 μm LLDPE film. The bag was filled with water and then stored in a special bag-in-box outer box, and the inner bag and the inner surface of the outer box bottom were adhered at the four corners.

In this example, an adhesive method was used in which a commercially available adhesive or hot melt was applied to the four corners of the bottom of the cardboard, the inner bag filled with the contents was packed, sealed, and stored for two days.

Then, the bag-in-box was turned upside down and drained from the spout portion as usual.

After discharging, the side surface of the outer case for BIB (bag-in-box) was cut with a cutter to check the state of the inner bag. The inner bag was as shown in FIG.

The above experiment was repeated 10 times, and the amount of the residual liquid remaining in the inner bag was examined.
It was 7 ml.

(Comparative Example) The same procedure as in the above example was performed using the same inner bag as in the above example. However, the inner bag did not adhere to the inner surface of the bottom of the outer box.

After the contents were discharged, the side of the outer box was cut with a cutter in the same manner as in the above embodiment, and the state of the inner bag was confirmed. The inner bag was as shown in FIG.

A similar experiment was performed for this comparative example.
When the amount of the residual liquid remaining in the inner bag was examined, it was 60 ml on average.
00 ml of water remained in the inner bag without being discharged.

As is clear from the comparison between the above embodiment and the comparative example, it is clear that the bag-in-box according to the embodiment of the present invention is more excellent in the reusability of the contents. This is because the inner bag of the bag-in-box of the present invention shrinks in the vertical direction when the inner bag of the bag-in-box of the present invention shrinks due to the discharge of the contents, as can be seen by comparing FIG. 13 and FIG.
This is due to less horizontal folds and wrinkles as compared to FIG. 13 (Comparative Example).

[0084]

As described above, according to the present invention, the bag for a bag-in-box having a spout is housed as an inner bag inside the outer box, and the inner bag and the inner surface of the bottom of the outer box are formed. It is intended to provide a bag-in-box characterized by being fixed, wherein the inner bag for the bag-in-box and the inner surface of the bottom of the outer box are fixed so that the bag-in-box can be used upside down. Even when the contents (liquid) are discharged, since the inner bag is held on the inner surface of the bottom of the outer box, it is possible to prevent the inner bag from shrinking while crushing in the direction of gravity. And, by preventing the crushing in the lateral direction, the inner bag does not form a fold or wrinkle extending in the lateral direction and does not hinder the discharge of the contents. Can be.

[Brief description of the drawings]

FIG. 1 is a front view showing a folded state of an example of a bag-in-box bag body (flat bag type) of the present invention.

FIG. 2 is a front view showing a state in which another example (gusset type) of the bag-in-box bag body of the present invention is folded.

FIG. 3 is a perspective view showing a state in which contents are filled in the bag body of FIG. 2;

4 is a perspective view showing a state in which contents are filled in the bag body of FIG. 1 and stored in an outer box (bag-in-box).

FIG. 5 is a diagram schematically showing a horizontal cut surface of the bag of FIG. 2 in a filled state.

FIG. 6 is a schematic sectional view showing a state (prior art) when the bag-in-box of FIG. 2 is used.

FIG. 7 is an explanatory view showing one example of a bag-in-box of the present invention. (A) shows the state before opening, and (B) shows the state where the spout is drawn out after opening.

FIG. 8 is an explanatory view showing another example of the bag-in-box of the present invention. (A) shows the state before opening, and (B) shows the state where the spout is drawn out after opening.

FIG. 9 is an explanatory view showing another example of the bag-in-box of the present invention. (A) shows the stage of assembling the bag-in-box, (B) shows the completed state, and (C) shows the state where the spout is drawn out after opening.

FIG. 10 is a schematic sectional view showing a state when the bag-in-box of the present invention is used.

FIG. 11 is a front view of the inner surface of the bottom of the outer box of the bag-in-box of the present invention.

FIG. 12 is a schematic sectional view showing an example of another embodiment of the present invention.

FIG. 13 is a schematic view showing a state of an inner bag when an embodiment of the present invention is used.

FIG. 14 is a schematic diagram showing a state of an inner bag when a comparative example is used.

FIG. 15 is a schematic sectional view showing a conventional technique.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag main body 2 ... Front side flat part 2-a ... Outer film 2-a1 ... Outer layer of outer film 2-a2 ... Middle layer of outer film 2-a3 ... Inner layer of outer film 2-b ... Inner film 3 ... flat part on the rear side 4 ... corner part 5 ... side part 6 ... valley fold line 7 ... top seal part 8 ... bottom seal part 9 ... side seal part 10 ... closing seal part 11 ... triangular fin part 13 ... cap 15 ... internal space of the bag 16 ... space between synthetic resin films 17 ... local bonding parts 21, 41 ... outer box 22 ... space between the outer box and inner bag 43 ... opening assist means 44 ... opening 45 ... fan-shaped Fragment 46 46 Inner flap 47 Outer flap 50 Inner surface of outer box bottom 51 Four corners of inner surface of outer box bottom 101 101 Bag-in-box bag (flat bag) of the present invention 150 Conventional bag-in box 151 Conventional Bag Inner bag used for in-box 152: Outer box 154: Spout 201: Bag body for bag-in-box of the present invention (gusset bag) C: Spout CP: Cap P: On top seal and bottom seal Arbitrary position Q: Arbitrary position on side seal R: Apex of corner S: Adhesion between inner bag and inner surface of bottom of outer box m: Narrow angle between top seal or bottom seal and closure seal m1: Narrow angle between the top seal portion and the closure seal portion m2: Narrow angle between the bottom seal portion and the closure seal portion n: Narrow angle between the side seal portion and the closure seal portion n1 ... The narrow angle n2 between the side seal portion and the top-side closing seal portion. N2 The narrow angle between the side seal portion and the bottom-side closing seal portion. D ... The diameter of the opening e. Sa

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tomoya Shinohara 11-5 Nibancho, Chiyoda-ku, Tokyo F-term (reference) 3E067 AA03 AB26 AB96 BA05C BA12B BA13B BB02C BB12B BB14B BB25B BC06B BC06C CA24 EA06 EA32 EB27 EC22 FA04 FB16 FC01

Claims (5)

[Claims] 1. A bag wherein a bag body for a bag-in-box having a spout is housed as an inner bag inside an outer box, and the bottom of the inner bag is fixed to the inner surface of the bottom of the outer box. In box. 2. The bag-in-box according to claim 1, wherein the inner bag is a gusset bag formed to be a cube or a rectangular parallelepiped when the contents are filled. 3. The bag-in-box according to claim 1, wherein the inner bag and the inner surface of the bottom of the outer case are fixed at at least four corners of the inner surface of the bottom of the outer case. 4. The bag-in-box according to claim 3, wherein the inner bag and the inner surface of the outer box bottom are fixed on the entire inner surface of the outer box bottom. 5. The bag-in-box according to claim 1, wherein the inner surface at the bottom of the outer case includes a lower end portion of a side surface of the outer case.