JPH08207939A - Bag for bag-in-box, and bag-in-box - Google Patents

Abstract

PURPOSE: To provide an internal bag for bag-in-box which is superior in impact resistance, using up property of a content, and self standing property at the time of filling of a content or after being taken out from an external box, and an internal bag for bag-in-box which is made to meet the international standard for pallet. CONSTITUTION: At respective corners 4 of a bag body which is formed of flat surface parts 2, 3 and pleat form side surfaces 5, closing seal parts 10 which are formed such as diagonally cutting off the corners, and triangular fin parts 11 which are integrally formed with the closing seal parts are provided. Then, the flat surface parts and side surface parts are formed of films made of a synthetic resin a plurality of which are laminated. The dimensions of the flat surface parts and side surface parts are kept in specified ranges so as to let them meet the international standard for pallet. An opening which is formed on the external box of a bag-in-box has a diameter by which a spout can be sufficiently pulled out together with a bag main body around the spout, and be formed into a funnel shape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-in-box used for storing and transporting liquid products (beverage, car oil, detergent, etc.) in various fields such as food industry, car industry and toiletry industry. Regarding bag and bag-in-box.

More specifically, it is an inner bag for a bag-in-box and is excellent in impact resistance, usability of the contents and self-sustaining property when the contents are filled or taken out from the outer box. As well as being related to the body, they can be arranged on an international standard pallet without any gaps so that there is no wasted space, and they have sufficient stability and strength even if they are stacked in two or more steps, and are compact and easy to handle. The present invention relates to an inner bag used for an easy bag-in-box.

The present invention also relates to a bag-in-box which is improved in usability and usability when taking out contents.

[0004]

2. Description of the Related Art In recent years, a bag-in-box, which is a so-called one-way container of a disposable type, has been widely used for transporting and storing various liquids such as beverages such as mineral water and industrial chemicals.

This bag-in-box uses a plastic foldable bag or container such as a flat bag obtained by sealing a plastic film as an interior or an integrally molded product obtained by blow molding molten plastic, This interior is an outer box such as a cardboard box,
Water resistance, chemical resistance, gas barrier properties, etc. for liquids are taken care of by the interior plastic bag or container, while the rigidity required for transportation and storage is taken up by the exterior. The bag-in-box configured in this way is labor-saving and cost-saving because it does not require collection compared to conventional glass bottles and tin cans, and it is foldable, so empty containers can be easily transported and stored, reducing distribution costs. It has the advantage that it can be achieved.

As an inner bag for a bag-in-box, for example, a spout 12 is provided at the upper part of the bag body 1 as shown in FIG.
A flat bag 501 made of synthetic resin having the following is used. Then, as shown in FIG. 13, after the flat bag 501 is filled with the liquid as the content, the flat bag 501 is housed and sealed in the outer box 41.

However, since such a flat bag type inner bag has poor followability to the inner shape of the outer box, a wasteful space 42 is liable to be formed between the outer box and the inner bag when stored in the outer box. The corner portion 4 of the inner bag is bent to follow the inner shape of the outer box, and creases and wrinkles are easily formed in portions other than the corner portion. Then, when a useless space 42 is generated between the outer box and the inner bag, the inner bag is likely to move inside the outer box, so that the inner bag is easily ruptured when a large impact such as a drop is applied to the bag-in-box. Even when a small shock such as vibration is applied, the inner bag is easily scratched and damaged. Further, when a part of the inner bag, especially the corner portion 4 is bent, the residual liquid is accumulated in the bent part (so-called “air water”), and it is difficult to use up the contents to the end. Particularly in the case of a bag-in-box, since the internal volume is relatively large, the amount of residual liquid accumulated in the bent portion is large, and it is important to improve the drainability of the residual liquid.

Further, since the flat bag type inner bag is not self-supporting, when the inner bag is filled with liquid in the manufacturing process of the bag-in-box and then stored in the outer box, the inner bag can be handled easily. It's inconvenient. If the inner bag is not self-supporting,
It is inconvenient to handle even when you want to remove the outer box and use only the inner bag depending on the environment of use, such as when using a bag-in-box with a cardboard box installed in a wet place with a lot of water. Is.

On the other hand, it is desirable that the bag-in-box has a cubic shape in order to facilitate grasping of the bag-in-box and improve usability, and to stack the bag-in-box compactly during storage and transportation. From this point of view, a bag-in-box having an internal capacity of about 20 liters, which is relatively in demand, is a cube with one side of about 300 mm. However, in recent years, the international standard for the dimensions of pallets on which various items are placed for transportation and storage is 1100 mm x
It is set to 1100 mm (length x width), and in the future, this international standard product will become the mainstream of pallets, and each facility that handles pallets will also adopt standards and specifications that match this international standard product. Is expected. When arranging a bag-in-box having a cubic shape with a side of about 300 mm on an international standard pallet, a total of 9 rows (3 rows × 3 rows) can be stacked per stage, resulting in wasted space. There is a problem that many remain. In addition, since the cubic bag-in-box is stacked on a pallet, it lacks stability during loading and transportation.

By the way, the influence of the outer box on the drainage and usability of the bag-in-box cannot be ignored. When taking out the contents from the bag-in-box, for example, hold the outer box with both hands, support the edge of the bottom part on the table, and put the contents flowing out from the spout protruding from the outer box into a suitable container. I am performing operations such as transferring to. here,
When the inner bag of the bag-in-box is a flat bag, its spout is usually fixed to the opening of the outer box, so many folds and wrinkles are formed on the bag body around the spout. And then they overlap. Needless to say, the creases and wrinkles around the spout cause the drainage to be difficult, and cause the pulsation of the drainage, which causes the drainage. In addition, the spout that protrudes from the opening of the outer box is fixed to the outer box and is short and not in the shape of a hose.Therefore, you can grasp the spout with your hand to control the outflow direction of the contents. You can't do that, and it can cause stains around the area.

On the other hand, when the inner bag of the bag-in-box is an integrally molded product, the inner bag has a shape close to the inner shape of the outer box, and its spout is fixed to the opening of the outer box. In addition, since the bag body around the spout is a funnel type, the residual liquid easily collects at the spout when it is used up. Further, since the spout is not fixed to the opening of the outer box, there is a certain degree of freedom, and it is possible to control the outflow direction of the contents to some extent. However, since the inner bag of the integrally molded product has poor transparency, it is difficult to check the remaining liquid amount when it is used up, and since it is thick and rigid and the spout length is short, there is some freedom in the spout. As in the case of the flat bag, it is difficult to control the outflow direction of the contents by grasping the spout with a hand.

[0012]

SUMMARY OF THE INVENTION The present invention has been accomplished in view of the above circumstances, and a first object thereof is impact resistance, useability of contents, filling of contents, and outer case. An object of the present invention is to provide an inner bag for a bag-in-box which is excellent in self-sustainability after being taken out from the bag. The second purpose is that they can be lined up on an international standard pallet without any gaps so that there is no wasted space, and the stability and strength at the time of stacking, or gripping and carrying compared to a cubic bag-in-box. An object of the present invention is to provide an inner bag used for a bag-in-box, which is comparable in terms of ease of use. A third object is to provide a bag-in-box in which the outflow direction of the contents can be easily controlled, the remaining liquid amount is highly visible, and the remaining liquid amount is extremely small.

[0013]

In order to achieve the above object, according to the present invention, an inner bag for a bag-in-box includes (a) a pair of opposing flat surface portions constituting a front side and a back side of the bag, and Each of the corners of the bag body of the four-sided seal having two side surfaces formed so as to have a valley fold line folded inward in a fold-like manner has a closed seal portion and a triangular fin portion. And (b) the flat surface portion and the side surface portion forming the bag body are formed by at least two synthetic resin films that are superposed in a non-bonded state, and (c) the closing seal portion is formed in the bag body. A pair of flat portions overlap each other, and the inner surfaces of the bag main body that face each other in a folded state such that the two side surface portions having the valley fold line are interposed between the overlapping flat surface portions, the top seal portion and the bottom portion. Of the seal part It is formed by adhering in a straight band shape from an arbitrary position of any one of the seal portions to an arbitrary position of the side surface seal portion, and (d) the triangular fin portion has a top seal portion and a bottom seal portion. The bag body for a bag-in-box is characterized in that it is formed by being surrounded by any one of the seal portions, the side surface seal portion and the closed seal portion.

The above invention has several preferred embodiments. First, in the above bag body for bag-in-box, the apexes of the front and rear corners of the bag main body, which face each other, may be bonded to each other.

Secondly, in the above bag body for bag-in-box, at least one is provided on each of the pair of flat surface portions and the two side surface portions, and strip-shaped film pieces are provided so as to extend in the vertical direction of the bag body. It can be configured such that a bonded or strip-shaped gas-filled layer is provided.

Thirdly, in the above bag body for bag-in-box, a pair of left and right suspending portions is formed on at least one of the top side and the bottom side of the bag body, and the suspending portions face each other. It is formed by adhering front and rear triangular fins that are in contact with each other at the apex of the corner and at least at one position on the top seal part or the bottom seal part. Can be configured as.

Fourthly, in the bag body for the bag-in-box, at least one triangular fin portion may be formed with a punch hole. Fifthly, in the bag body for bag-in-box, at least one layer in the synthetic resin film may be a metal foil layer.

Sixthly, in the bag body for bag-in-box described above, (e) the narrow angle between the top seal portion and the closing seal portion is 45 to 55 °, and the bottom sealing portion and the closing sealing portion are The narrow angle sandwiched can be configured to be 40 to 50 °.

Seventhly, in the bag body for bag-in-box, the actual size excluding the width of the (f-1) seal portion is
The horizontal dimension of the flat surface portion is 260 to 340 mm, the horizontal dimension of the side surface portion is 180 to 260 mm, and the vertical dimension of the flat surface portion and the side surface portion is 490 to 660 mm, (g)
It can be configured to have a rectangular parallelepiped shape when the contents are filled.

Eighth, in the bag for the bag-in-box, (f-2) the actual size excluding the width of the seal portion,
The horizontal dimension of the flat surface portion is 190 to 270 mm, the horizontal dimension of the side surface portion is 140 to 220 mm, and the vertical dimension of the flat surface portion and the side surface portion is 330 to 600 mm, (g)
It can be configured to have a rectangular parallelepiped shape when the contents are filled.

Further, in the present invention, the bag-in-box is made of any one of the bag-in-box bag body having the spout inside the outer box, or the synthetic resin film having the spout. A 4-side sealed bag (eg, flat bag) is stored as an inner bag, and one surface of the outer box is
A bag provided with an opening assisting means for forming an opening having a diameter capable of pulling out the bag body around the spout 50 mm or more when the spout of the inner bag is projected. Configured to be an inbox.

Preferably, the unsealing assisting means provided in the bag-in-box can tear one surface of the outer box radially from a position to be the center point of the opening, and after unsealing, The opening assisting means can leave a fan-shaped piece around the opening. In addition, the bag-in-box preferably has a capacity of the inner bag of 5 to 25 liters, and the outer box can be a cube or a rectangular parallelepiped.

The bag body for a bag-in-box according to the present invention has the following actions. First, the bag body for a bag-in-box of the present invention has a pillar structure in which front and rear flat surface portions and side surface portions having gussets are surrounded and side edge portions of the flat surface portions and the side surface portions are sealed, Moreover, each of the corners on the top side and the bottom side is provided with a linear strip-shaped closing seal part that cuts off the corner diagonally, so that when filled with the liquid as the content, it takes a shape close to a cube or a rectangular parallelepiped. .
Therefore, the bag-in-box bag of the present invention has excellent followability with respect to the inner shape of the outer box having a cubic or rectangular parallelepiped shape, fits snugly inside the outer box, and wastes between the outer box and the inner bag. Since there is very little space inside, the inner bag does not move easily inside the outer box, and it is unlikely that it will burst due to impact or tearing due to rubbing.

Secondly, the bag-in-box bag of the present invention is provided with triangular fins at the respective corners which are completely closed from the inner space of the bag body so that the contents cannot enter. There is. For this reason, the residual liquid does not collect in the corners, and the residual liquid dischargeability of the bag-in-box is improved. 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 bag body is improved.

Thirdly, the bag body for a bag-in-box of the present invention has a shape close to a cube or a rectangular parallelepiped when it is filled with the content liquid, and therefore is excellent in self-supporting property. Therefore, when manufacturing the bag-in-box (for example, the step of filling the inner bag with liquid or the step of storing the inner-bag in the outer box) or when removing the outer box of the bag-in-box and using it in the state of only the inner bag. In, it is easy to handle.

Fourthly, since the flat surface portion and the side surface portion of the bag-in-box bag of the present invention are formed by at least two synthetic resin films that are superposed in a non-bonded state, the outer synthetic resin Only the film made of the resin is worn by friction with the outer box, and the synthetic resin film on the inner side is less likely to be worn by sliding on the synthetic resin film on the outer side. Therefore, it is less likely to be torn than the flat surface portion and the side surface portion having the same thickness formed of one synthetic resin film. In addition, when the flat surface portion and the side surface portion of the inner bag are formed by several synthetic resin films as described above, the flat surface portion and the side surface portion having the same thickness can be formed by one synthetic resin film. Since the inner bag is more flexible than when it is formed, it is easy to handle when the inner bag is stored in the outer box.

In the first preferred embodiment, when the apexes of the front and rear corners of the bag body which face each other are adhered to each other, the triangular fins are jumped up or randomly bent in an unspecified direction. Since it is not used, the bag-in-box manufacturing process (for example, the step of filling the inner bag with liquid or the step of storing the inner bag in the outer box) or removing the outer box of the bag-in-box and using it as an inner bag only In the case of doing, the triangular fin portion does not get in the way. In addition, the triangular fins prevent the bag wall where the contents are filled from directly contacting the upper and lower surfaces of the outer box, preventing the bag from rubbing, tearing, or pinholes due to vibration. To be done.

In a second preferred embodiment, at least one is provided on each flat surface portion and each side surface portion of the bag body,
When a strip-shaped film piece is adhered so as to extend in the vertical direction of the bag body or a strip-shaped gas filling layer is provided,
The independence of the inner bag is further improved. As described above, the bag body for a bag-in-box of the present invention has self-supporting property, but since the capacity is relatively large, the body of the bag body tends to sag before and after liquid filling, and when the self-supporting property is insufficient. There is. On the other hand, when a strip-shaped film piece is adhered or a strip-shaped gas-filled layer is provided, the body of the bag body becomes stiff (improves rigidity or bending resistance).
Therefore, the sagging of the body is reduced, and the self-supporting property of the inner bag is further improved.

In a third preferred embodiment, opposing front and rear triangular fin portions are adhered to each other at the apexes of the corners, and at least one of the top seal portion or the bottom seal portion is bonded. If a pair of left and right suspension parts is formed on one or both of the top side or bottom side of the bag by bonding at the location of the place, a hand or machine hand is placed in the space between the fin part and the body part. It becomes possible to hang the bag body by inserting.

In the fourth preferred embodiment, when a punch hole is formed in at least one of the triangular fin portions at each corner of the bag body, a hook or the like is hooked in the punch hole to form a bag. Since it can assist self-sustaining and can suspend the bag, it is easy to handle when the bag-in-box is manufactured and used only in the inner bag.

In the fifth preferred embodiment, when at least one layer of the synthetic resin film is a metal foil layer,
The light-shielding property of the bag becomes extremely high, and the self-supporting property of the bag is improved by the shape-retaining action of the metal foil layer.

In a sixth preferred embodiment, the narrow angle sandwiched between the top seal portion and the closing seal portion is 45 to 55 °,
The narrow angle between the bottom seal part and the closing seal part is 40 ~
When it is set to 50 °, the followability of the inner bag to the inner shape of the outer box and the effect of reducing the residual liquid are particularly excellent.

That is, by setting the narrow angle sandwiched between the bottom seal portion and the closing seal portion to be 40 to 50 °, the bottom portion of the bag body at the time of filling can be made into a shape very close to a cube or a rectangular parallelepiped. . Further, since the closing seal portion can be provided just along the position where the corner is bent, it is possible to sufficiently prevent the residual liquid from being stored in the corner while maximizing the filling space. Furthermore, the effect of stress dispersion on impact can be maximized.

On the other hand, the top of the bag is pulled downward by its own weight and is provided with a spout, and a slight unfilled space is left so that the contents do not overflow when opened. Therefore, the top portion of the bag body has a slightly pointed shape without flattening the upper surface as much as the bottom portion, and the corner portion of the top portion is easily bent at a deeper position than the corner portion of the bottom portion.
Therefore, at the top, the narrow angle sandwiched between the top sealing part and the closing sealing part is set to 45 to 55 ° to slightly deepen the position of the closing sealing part, so that the top part is closed along the position where the corner is bent. Provide a seal part. As a result, at the top of the bag, it is possible to sufficiently prevent the residual liquid from being stored in the even part while maximizing the filling space.

In the seventh preferred embodiment, (f-1) the horizontal dimension of the plane portion is 2 with the actual dimension excluding the width of the seal portion.
60 to 340 mm, the lateral dimension of the side surface is 180 to 26
0 mm, and the vertical dimension of the flat surface portion and the side surface portion is 49
When it is set to 0 to 660 mm and (g) is formed into a rectangular parallelepiped when the contents are filled, it is possible to provide a bag-in-box having a capacity of about 20 liters, which is extremely compatible with an international standard pallet.

That is, the bag body of the present invention having the flat surface portion and the side surface portion having the above-mentioned dimensions has a capacity of about 20 liters, and the horizontal dimensions 260 to 340 of the flat surface portion when the contents are filled.
mm, lateral dimension of the side part 180 to 260 mm, height 230
It becomes a rectangular parallelepiped of about 480 mm. Therefore, if this bag is used as an inner bag, a rectangular parallelepiped bag-in-box having an internal capacity of about 20 liters and substantially the same size as the above size can be obtained. The height of the bag at the time of filling is shorter than the vertical dimension of the flat part and side part before filling by the lateral dimension of the side part because the flat part and the upper and lower ends of the side part are the bag body. This is because the top surface and the bottom surface of the shape at the time of filling are formed by wrapping around the top surface side and the bottom surface side.

The capacity 20 thus obtained is obtained.
110 liters of rectangular parallelepiped bag-in-box
On a pallet of 0 mm x 1100 mm (length x width), a total of 12 pieces of length 4 rows x width 3 rows can be stacked exactly. If the bag-in-box is within the above size range, the width of each bag-in-box does not become too thin or too slender, so it is easy to grasp and easy to use, and it also maintains sufficient stability and strength. are doing. Furthermore, if the bag-in-box is a rectangular parallelepiped, the bag-in-boxes can be stacked side by side by changing the direction in which they are lined up, so that sufficient stability and strength can be secured even for the stacked piles as a whole. it can.

In the eighth preferred aspect, (f-2) the horizontal dimension of the plane portion is 1 by the actual dimension excluding the width of the seal portion.
90 to 270 mm, the lateral dimension of the above side part is 140 to 22
0 mm, and the vertical dimension of the flat surface portion and the side surface portion is 33
When it is set to 0 to 600 mm and (g) becomes a rectangular parallelepiped when the contents are filled, it is possible to provide a bag-in-box having a capacity of about 10 liters, which is extremely compatible with an international standard pallet.

That is, the bag having the above size has a capacity of about 10 liters, and when the contents are filled, the lateral dimension of the flat surface portion is 190 to 270 mm and the lateral dimension of the side surface portion is 140 to 220.
mm, height 110 to 460 mm. Therefore, if this bag is used as an inner bag, a rectangular parallelepiped bag-in-box having an internal capacity of about 10 liters and substantially the same size as the above size can be obtained.

Then, the capacity 10 thus obtained is obtained.
110 liters of rectangular parallelepiped bag-in-box
On a 0 mm x 1100 mm (length x width) pallet, a total of 20 pieces of length 5 rows x width 4 rows can be stacked exactly. Further, as in the seventh aspect, the individual bag-in-boxes do not become too thin or too long and thin, so that they are easy to grasp and easy to use, and also have sufficient stability and strength. Further, the bag-in-boxes can be stacked in a cross-shaped manner by changing the direction in which they are lined up for each step, so that sufficient stability and strength can be secured even for the stacked piles as a whole.

On the other hand, in the bag-in-box of the present invention, at the time of use, the bag main body around the spout is 50 mm from the opening opened in the outer box by using the opening assisting means.
Since it can be pulled out above, the area around the spout becomes a funnel type. Therefore, the contents are easily collected at the spout and the drainage is smooth. Therefore, the residual liquid is unlikely to remain and the pulsation is small. Further, since the spout is sufficiently pulled out from the outer box, the spout can be easily grasped and the outflow direction of the contents can be easily controlled. Moreover, the inner bag is not an integrally molded product, but is formed by sealing a thin synthetic resin film and has high transparency, so that the visibility of the residual liquid is good.

The opening assisting means provided in the bag-in-box of the present invention is capable of radially tearing the outer box from the position which should be the center point of the opening of the outer box when opening the opening, and is fan-shaped. It is preferable that the opening assisting means be capable of leaving the tear pieces around the opening. In this case, the pouring outlet pulled out from the opening and the bag body around the pouring outlet are pressed or supported by the fan-shaped tear pieces left around the opening, so that the pouring outlet is stabilized in position. .

[0043]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be shown to explain the present invention more specifically. Figure 1
It is a front view which shows the state which folded the example of the bag body for bag in boxes of this invention. 2 is a perspective view showing a state in which the bag body of FIG. 1 is filled with contents.

Referring to FIGS. 1 and 2, the bag 101 for bag-in-box of the present invention is a bag having a capacity of 20 liters used for transportation and storage of water and oil. However, in the present invention, there are no particular restrictions on the type and capacity of the contents. As the contents, for example, drinking water, coffee, soup, wine, liquor, milk, beverages such as milk drinks,
Widely applicable are soy sauce, flavor seasonings such as sauces, car oils, detergents, and chemical products such as industrial chemicals. The content may be a liquid containing solid matter, or a fluid other than liquid such as powder. Further, with respect to the capacity, it can be widely applied, for example, from about 5 liters for household use to about 20 liters for business use.

As shown in FIG. 2, the bag body of the present invention in a state of being filled with contents is generally a cube or a rectangular parallelepiped except that the triangular fin portion 11 is present.
In the case of the bag body 101, it is generally a rectangular parallelepiped.

The bag body 101 is formed so as to have a pair of opposing flat surface portions 2 and 3 constituting the front side and the back side of the bag and a valley fold line 6 folded inward in a fold-like shape. It is a four-sided seal bag body having a side surface part 5 and a top seal part 7, a bottom seal part 8 and a side seal part 9 on the periphery of the bag body, and a closing seal at each corner 4 of the bag body. It has a portion 10 and a triangular fin portion 11.

Each flat surface portion and each side surface portion are square or rectangular, and in the case of the bag body 101, the flat surface portions 2 and 3 and the side surface portion 5 are all rectangular. Adhesion for forming the top seal portion 7, the bottom seal portion 8, the side surface seal portion 9 and the closing seal portion 10 is usually performed by a heat sealing method. By bending and forming the film for forming the bag body, part of the top seal portion 7, the bottom seal portion 8 and the side seal portion 9 can be omitted. The bag body 101 may be appropriately provided with a spout 12 similar to a conventional inner bag for a bag-in-box.

FIG. 3 shows the bag 1 of the present invention in a filled state.
It is the figure which showed the horizontal cross section of 01 typically. FIG.
As shown in FIG. 5, the flat surface portions 2 and 3 and the side surface portion 5 are formed by at least two synthetic resin films that are superposed in a non-bonded state, and have a buffer hammer type structure. Here, "formed by at least two synthetic resin films that are superposed" means that a plurality of synthetic resin films are separated or have a structure in which they are superposed in a separable state. . As such a structure, for example, a structure in which they are superposed in a non-bonded state as shown in FIG. 3 can be exemplified.
Further, as another example, it is possible to exemplify a laminated structure in which the bag is pseudo-bonded with an adhesive strength such that the bag is peeled off after the start of use. The pseudo-bonded film is easy to handle during the bag manufacturing stage.

In FIG. 3, the front flat portion 2 will be described as an example. The flat portion 2 is formed of the outer film 2-a and the inner film 2-b, and the film 2 is formed in each seal portion such as the side seal portion 9. -A and 2-b are adhered, and a space 1 is provided between both films in the other non-adhered portion.
There are six. However, both films have side seals 9
It may be locally adhered at a portion 17 other than each seal portion such as. Each film may be a single layer film like 2-b or a composite film like 2-a.

The material resin and thickness of each synthetic resin film or each layer in the film are appropriately determined in consideration of various properties such as the nature of the contents and the strength required for the bag. Generally, with respect to the outer film 2-a or the outer layer 2-a1 of the outer film, the strength and abrasion resistance required in relation to the external environment are emphasized, and the inner film is determined. Regarding 2-b or the inner layer (not present in 2-b) of the inner film, the performance such as water resistance, chemical resistance, gas barrier property or sealing property required in relation to the internal environment is emphasized. Will be decided. 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 of the inner film (not present in 2-b),
It is preferable to select a combination in which the slip between them is improved as much as possible.

For example, the flat surface portion 2 of the bag body 101,
3 and the side surface portion 5, the outer film 2-a is a composite film, and its layer structure [outer layer 2-a1 / intermediate layer 2-a2 / inner layer 2-a3] has a stretched nylon (ON) of 15 μm. / 20 μm polyethylene (PE) / 60
It is a linear low density polyethylene (LLDPE) of μm.
On the other hand, the inner film 2-b is a single layer film,
It is a LLDPE film of μm.

Other specific examples include (1) Outer film [15 μm from the outside to the inside.
m polyvinylidene chloride coat ON layer (K coat ON)
/ 20 μm PE / 60 μm LLDPE] and inner film [60 μm LLDPE], (2) Outer film [12 μm metal evaporated polyethylene terephthalate layer (VMPET) / 15 μm ON / 2]
0 μm PE / 60 μm LLDPE] and inner film [60 μm LLDPE], (3) Outer film [15 μm ON / 20 μm PE]
/ 60 μm LLDPE ・ ON ・ LLDPE coextrusion film] and inner film [60 μm LLDPE ・ ON
・ LLDPE coextrusion film], or (4) outer film [15 μm ON / 20 μm PE
/ 60 μm LLDPE / ethylene-vinyl alcohol copolymer (EVOH) / LLDPE coextrusion film]
And inner film [60 μm LLDPE / EVAL / L
LDPE co-extrusion film] (5) Outer film [12 μm silica evaporated polyethylene terephthalate layer / 15 μm ON / 20 μm PE
/ 60 μm LLDPE] and inner film [60 μm LLDPE] (6) 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] and the like.

In the above example, ON is effective in improving the strength, and K coat ON, VMPET, and EVOH are effective in improving the barrier property. Further, (3) is suitable especially when strength is desired to be improved.

At least one layer in the synthetic resin film may be a layer of metal foil such as aluminum foil. The metal foil layer makes the light shielding property of the bag extremely high,
In addition, the shape retaining property of the bag body is enhanced to contribute to the improvement of the self-supporting property. 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 from the outer box and used.

Each corner 4 of the bag body has a bag body 10 at the time of filling.
The closing seal portion 10 is formed in order to form the triangular fin portion 11 at each corner 4 while making the shape 1 as close to a cube or rectangular parallelepiped as possible. The closure seal portion 10 includes a bag body and a valley fold line 6 between a pair of flat surface portions 2 and 3 which are overlapped with each other.
In the state of being folded so that the two side surface portions 5 having the above are interposed, that is, in the state shown in FIG. 1, the inner surfaces of the bag bodies facing each other are sealed with either the top seal portion or the bottom seal portion. It is formed by adhering in a linear band shape from an arbitrary position P of the portion to an arbitrary position Q of the side surface seal portion.

Similarly to the above, from the viewpoint that the bag body 101 at the time of filling should have a shape as close to a cube or a rectangular parallelepiped as possible, the arbitrary position P is the top seal portion 7 and the bottom seal portion 8 and the valley fold line 6 as much as possible. The point closer to the intersection with is preferable. Therefore, the arbitrary position P is normally ± 1 from the intersection of the top seal portion 7 and the bottom seal portion 8 and the valley fold line 6.
It is provided in the range of cm, preferably on the intersection.

Further, from the same viewpoint as above, the respective closing seal portions 10 present in the respective corner portions 4 are arranged in the respective positional relations on the right side and the left side of the bag body, the front side and the rear side, and the top side and the bottom side. It is preferred that certain closure seals are as symmetrical as possible.

From the viewpoint of making the bag body 101 at the time of filling into a shape as close to a cube or a rectangular parallelepiped as possible, the closing seal portion 10 is configured so that the triangular fin portion 11 has a shape close to the right-angled isosceles triangle as much as possible. It is preferably formed. For that purpose, a narrow angle m (m1, m2) sandwiched between any one of the top seal portion and the bottom seal portion and the closed seal portion, and a narrow angle n sandwiched between the side seal portion and the closed seal portion. (N1, n2) is usually 30 to 6
0 °, preferably 40 to 50 °, particularly preferably m = n = 4
Set to 5 °. From such a viewpoint, m2 = n2 = 45 ° is adopted on the bottom side of the bag 101.

However, it is more preferable to form the closing seal portion on the top side of the bag at a position slightly deeper than the closing seal portion on the bottom side. More specifically, the lower limit value of the narrow angle m1 sandwiched between the top seal portion and the closed seal portion is 45 ° or more,
The angle is preferably 46 ° or more, more preferably 48 ° or more, and the upper limit value is 55 ° or less, preferably 53 ° or less, more preferably 52 ° or less. The top side of the bag is pulled downward by the weight of the contents, is equipped with a spout, and there is some unfilled space to prevent the contents from overflowing when opening, so it is not as deep as the bottom. The top surface has a slightly sharpened shape without flattening, and as a result, the top corner is more likely to bend at a deeper position than the bottom corner. Therefore, by adjusting the angle of the closing seal portion on the top side as described above, and forming the closing seal portion along the position where the even portion also bends on the top side, the filling space of the even portion is maximized while the filling space is maximized. It is possible to sufficiently prevent residual liquid storage. From such a viewpoint, m1 = 50 ° and n1 = 40 ° are adopted on the top side of the bag body 101.

Each corner 4 of the bag body is surrounded by one of the top sealing portion 7 and the bottom sealing portion 8, the side sealing portion 9 and the closing sealing portion 10 to close the sealing portion 10. The fin portion 11 having a triangular shape is formed integrally with the. This triangular fin portion 11
Since the inner space of is completely closed from the inner space of the bag body by the closing seal portion 10, the contents filled in the bag cannot enter therein. Therefore, the bag body 10
When storing 1 in the outer box, even if each corner 4 where the triangular fin portion 11 is formed is bent, the residual liquid does not collect in the corner, and the residual liquid discharging property of the bag-in-box is improved. To do. Further, since the closed seal portion 10 formed integrally with the triangular fin portion has an effect of stress dispersion against impact, the impact resistance of the bag body is improved.

The inner surfaces of the bag body facing each other in the triangular fin portion 11 may not be adhered as shown in FIG. 1, but may be continuously adhered to the adhesion portion of the closing seal portion 10. Good. In this case, there is no internal space of the fin portion 11. Further, the inner surfaces of the fin portion 11 may be partially or intermittently adhered to each other instead of being entirely adhered.

The triangular fin portion 11 is essentially an unnecessary portion of the bag body of the present invention, and this portion bounces up or bends in an unspecified direction, which makes the bag body complicated to handle. . For example, when manufacturing the bag-in-box (for example, the step of filling the inner bag with liquid or the step of storing the inner-bag in the outer box) or when the outer box of the bag-in-box is removed and used only in the inner bag. In, the triangular fin portion 11 becomes an obstacle. In order to eliminate such a complicated handling, preferably, as shown in FIG. 4, the opposite apexes 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 get out of the way, but the inclusion of the triangular fin portion 11 prevents the bag wall of the portion where the upper and lower surfaces of the outer box are filled with contents. Since they do not come into direct contact with each other, it is possible to prevent rubbing, tearing, or pinholes of the bag due to vibration or the like. When adhering the vertices R, the vicinity of the vertices R may be further adhered. For example, the top seal portions 7 or the bottom seal portions 8 facing each other on the front side and the back side of the bag body may be bonded continuously or discontinuously to the bonding portion of the apex R. In addition, when adhering the apexes of the corners, the adhering device used for forming the respective sealing portions of the bag body can be used.

By bonding the front seal portion 7 and the bottom seal portion 8 facing each other on the front side and the rear side of the bag body to each other at the apex R bonding portion continuously or discontinuously,
A pair of left and right hanging portions may be formed on the top side or the bottom side of the bag body. When this hanging part is formed, it is possible to hang the bag body by inserting a hand or machine hand into the space between the fin part and the body part, so when moving the bag body or discharging the contents. It is convenient. Especially in the bag manufacturing process, since the heavy bag after filling can be lifted by the machine hand and put in the outer box, labor can be saved by reducing the number of personnel, and environmental hygiene can be improved by introducing an aseptic filling system. Be advantageous to.

The adhesive portion which is continuously or discontinuously formed with the adhesive portion at the position of the apex R to form the hanging portion may be a band-shaped seal portion, a circular or elliptical shape, Point seal part (spot seal part) such as rectangle
It may be.

A punch hole 14 may be formed in the fin portion 11 as shown in FIG. By hooking the hooks on the punch holes 14, the bag body for the bag-in-box can be assisted or suspended. Therefore, it is convenient when performing various operations such as filling or storing in an outer box at the time of manufacturing, or when the inner bag is taken out from the outer box and used only in the inner bag at the time of use. Usually, as shown in FIG. 4, a pair of left and right punch holes 14 are formed on the top side of the bag body so as to penetrate through the front and rear two fin portions. However, the number and position of the punch holes 14 are not particularly limited, and for example, a pair of left and right punch holes may be provided on the bottom side of the bag body.

In the bag body for a bag-in-box according to the present invention, as shown in FIGS.
At least one strip-shaped film piece 31 is adhered to each of the three and two side surfaces 5 so as to extend in the vertical direction of the bag body (FIG. 5), or a strip-shaped gas filling layer 32 is provided. By (FIG. 6), the body of the gusset bag can be elastic. Therefore, the body of the gusset bag is less likely to sag, and the self-supporting property of the bag is improved. In addition, when the strip-shaped gas-filled layer 32 is provided, the heat retaining property, the heat insulating property, and the cushioning property of the inner bag can be improved.

As the strip-shaped film piece 31, a rigid synthetic resin film having a width of about 5 cm is usually used, and this film is bonded to the body of the bag body by an arbitrary bonding method such as heat sealing. As a resilient synthetic resin film,
For example, a thickness of 60 μm or more, preferably 60 to 100 μm
The polyethylene film and the polypropylene film can be exemplified. Further, a paper label or a plastic label having adhesiveness may be attached.

The strip-shaped film piece 31 may be adhered to the outer film 2-a or the inner film 2-b of the several synthetic resin films stacked. Further, one of the synthetic resin films stacked together may also serve as the film piece 31. For example, if the outer film 2-a and the inner film 2-b that overlap each other in the flat surface portions 2 and 3 and the side surface portion 5 are locally bonded in a strip shape in the vertical direction of the bag body, the film piece 31 is separately prepared. You don't have to.

FIG. 7 is a diagram schematically showing a cross section of the plane portion 2 with the gas filling layer 32 shown in FIG. Referring to FIG. 7, the strip-shaped gas-filled layer 32 has a gas-impermeable film 34 so that an unbonded portion 33 to be the inner surface of the gas-filled layer 32 is left on the outer surface of the flat portion 2.
Are formed by adhesive lamination. When one of the synthetic resin films that are stacked to form the flat portion 2 is a composite film, one layer in the composite film may also serve as the gas impermeable film 34. For example, the outer layer 2-a1 of the outer film can also serve as the gas impermeable film 34. As a method of adhering the gas impermeable film 34, any method such as heat sealing can be adopted. The gas impermeable films 34, which are divided into each one of the gas filled layers, may be arranged in several rows and bonded.

Referring to FIG. 6, the strip-shaped gas-filled layer 32 is usually about 5 cm in width, and the gas inlet 35 is provided so as to easily fill the gas. Further, instead of providing the gas inlets 35 in all the gas filled layers 32, it is convenient to connect the gas filled layer having the gas inlets 35 and the gas filled layer not having the gas inlets 35 with the gas inlet passages 36. The gas with which the inside is filled is preferably as low in reactivity as possible, and for example, air, inert gas, N ₂ gas, CO ₂ gas or a mixture thereof is used. Further, the gas filling capacity may be such that the body portion becomes more elastic than the unfilled gusset bag, but in order to sufficiently achieve the purpose, it is usually 5 v / v of the maximum filling capacity. % Or more, preferably 7 v / v% or more.

The dimensions of the bag of the present invention are preferably determined in consideration of international standards for pallets. From this perspective,
When the bag volume is around 20 liters (approximately 15 to 25 liters), the actual size excluding the width of the seal part is
The horizontal dimension of the flat surface portion is 260 to 340 mm, the horizontal dimension of the side surface portion is 180 to 260 mm, and the vertical dimension of the flat surface portion and the side surface portion is 49.
It is preferably 0 to 660 mm. More preferably,
With the actual dimensions excluding the width of the seal part, the horizontal dimension of the flat part is 28
0 to 320 mm, lateral dimension of the side part is 200 to 240 m
m, and the vertical dimensions of the flat surface portion and the side surface portion are 490 to 660 mm.

When the bag having the above dimensions is inflated, the upper and lower ends of the flat surface portion and the side surface portion wrap around the upper surface side and the lower surface side of the bag body, so that the height of the bag at the time of filling is the flat surface portion before filling. Also, the lateral dimension of the side surface portion is shorter than the longitudinal dimension of the side surface portion. For this reason, the bag having the above dimensions has a horizontal dimension of 260 to 340 mm in the flat surface portion and a lateral dimension of 18 in the side surface portion at the time of filling.
It is a generally rectangular parallelepiped having a height of 0 to 260 mm and a height of 230 to 480 mm. Therefore, if this bag is used as an inner bag, a rectangular parallelepiped bag-in-box having an outer dimension slightly larger than the inflated dimension can be obtained.

The bag-in-box of about 20 liters having the size within the specific range thus obtained has a size of 1100 mm × 1100 mm as shown in FIG.
On the (vertical × horizontal) pallet 61, a total of 12 vertically 4 rows × 3 horizontal rows can be stacked exactly. If the bag-in-box is within the above dimensions,
Each bag-in-box is compact and does not become too thin or too slender, so it is easy to grasp and easy to use, and also has sufficient stability and strength. Furthermore, the bag-in-box of the above dimensions is a rectangular parallelepiped,
Since the direction in which the bag-in-boxes are arranged can be changed in each step as shown in FIG. 8 to stack them in a cross beam shape, sufficient stability and strength can be secured even in the stacked pile as a whole.

When it is desired to adjust the volume of the bag within the above-mentioned range, it can be easily adjusted by changing only the vertical dimensions of the flat surface portion and the side surface portion. For example, the actual size excluding the width of the seal part, the horizontal dimension of the flat part is 300 m
m, the lateral dimension of the side surface portion is 220 mm, and the vertical dimension of the flat surface portion and the side surface portion is 575 mm, the capacity is 20 liters when expanded, the horizontal dimension of the flat surface portion is 300 mm, and the lateral dimension of the side surface portion is 2.
A bag body having a size of 20 mm and a height of 334 mm is obtained, which can be housed in an outer box having an outer dimension of 320 mm × 240 mm × 390 mm to form a bag-in-box.

On the other hand, of the above dimensions, when the vertical dimension of the flat surface portion and the side surface portion is changed to 491 mm and the other dimensions are not changed, the capacity is 15 liters at the time of expansion, the horizontal dimension of the flat surface portion is 300 mm, the side surface portion. Lateral dimension of the part 220mm, height 250
A bag body having a size of mm is obtained, and the outer size is 320 mm × 24.
It can be stored in an outer box of 0 mm x 300 mm to form a bag-in-box.

Further, in the above dimensions, when the vertical dimension of the flat surface portion and the side surface portion is changed to 658 mm and the other dimensions are not changed, the capacity is 25 liters when expanded and the horizontal dimension of the flat surface portion is 30.
A bag body having a size of 0 mm, a lateral dimension of 220 mm, and a height of 417 mm was obtained, and the outer dimension was 320 mm x 240 mm.
The bag can be stored in an outer box of × 470 mm to form a bag-in-box.

Even when the bag of the present invention has a capacity of about 10 liters (approximately 5 to 15 liters), it is preferable to determine the size of the bag in consideration of the international standard of pallets.
When the volume of the bag is set to about 10 liters, the actual size excluding the width of the seal part and the lateral size of the flat part are 190 to 2
It is preferable that the horizontal dimension of the side surface portion is 70 mm, the lateral dimension of the side surface portion is 140 to 220 mm, and the vertical dimension of the flat surface portion and the side surface portion is 330 to 600 mm. More preferably, the horizontal dimension of the flat surface portion is 210 to 250 mm, the horizontal dimension of the side surface portion is 160 to 200 mm, and the vertical dimension of the flat surface portion and the side surface portion is 330 to 600 mm in actual dimensions excluding the width of the seal portion.

The bag having the above dimensions, when filled with contents, has a horizontal dimension of 190 to 270 mm in the flat portion, a horizontal dimension of 140 to 220 mm in the side portion, and a height of 110 to 460 mm.
Since this is a generally rectangular parallelepiped, a rectangular parallelepiped bag-in-box having an outer dimension slightly larger than the inflated dimension can be obtained by using this bag.

The bag-in-boxes of about 10 liters having the dimensions within the specified range thus obtained are fit on the international standard pallet with a total of 20 rows of 5 columns × 4 rows. Can be stacked. In addition, it is compact, easy to grasp and easy to use,
It also retains sufficient stability and strength. Further, the bag-in-boxes can be stacked in a cross-shaped manner by changing the direction in which they are lined up for each step, so that sufficient stability and strength can be secured even for the stacked piles as a whole.

Even when the capacity is about 10 liters, the capacity can be easily adjusted by changing only the vertical dimensions of the flat surface portion and the side surface portion. For example, when the horizontal dimension of the flat surface portion is 230 mm, the horizontal dimension of the side surface portion is 180 mm, and the vertical dimension of the flat surface portion and the side surface portion is 464 mm, the actual size excluding the width of the seal portion is 10 liters when expanded. , The lateral dimension of the plane part is 230 mm, the lateral dimension of the side part is 180
A bag having a size of mm and a height of 266 mm is obtained, and the bag can be housed in an outer box having an outer dimension of 250 mm × 200 mm × 320 mm to form a bag-in-box.

On the other hand, of the above dimensions, when the vertical dimension of the flat surface portion and the side surface portion is changed to 331 mm and the other dimensions are not changed, the capacity is 5 liters at the time of expansion, the horizontal dimension of the flat surface portion is 230 mm, and the side surface portion. Lateral dimension of the part 180 mm, height 133 m
A bag body having a size of m is obtained, and the outer size is 250 mm × 200.
The bag-in-box can be stored in an outer box of mm × 190 mm.

Further, of the above dimensions, when the vertical dimension of the flat surface portion and the side surface portion is changed to 597 mm and the other dimensions are not changed, the capacity is 15 liters when expanded and the horizontal dimension of the flat surface portion is 23.
A bag body having a width of 0 mm, a lateral dimension of 180 mm, and a height of 399 mm is obtained. The outer dimension is 250 mm x 200 mm.
A bag-in-box can be stored in an outer box of × 450 mm.

As the outer box for enclosing the bag body for the bag-in-box as described above, a conventional outer box for the bag-in-box can be used. A cardboard box is typically used as the outer box for the bag-in-box, but when this is used, paper dust may come out and adhere to the outer surface of the inner bag or may be scattered around the bag-in-box. In this case, a container made of a material such as plastic that does not emit paper dust 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 a foldable type, and is suitable for enclosing a small capacity (10 liters or less) inner bag which is often used by taking out the inner bag from the outer box. . The foldable container may not have a good light-shielding property in some cases, but in that case, it is preferable to use a bag body made of a synthetic resin film having at least one layer of metal foil such as aluminum foil as the inner bag.

On the wall surface of the outer box, an opening for allowing the spout of the inner bag to project is required. For this reason, usually, the opening assisting means such as perforations is provided on the wall surface of the outer box,
The opening is opened at the beginning of use by utilizing this opening assisting means. It is preferable that the opening formed by the opening assisting means has a size that allows the bag body around the spout to be sufficiently pulled out when the spout is projected.

FIG. 9 shows a bag-in-box 202 which is a combination of an outer box provided with such unsealing assisting means and a bag-in-box bag of the present invention. FIG. 9 (A)
As shown in, the outer box 41 of the bag-in-box is provided with unsealing assisting means 43 for opening the spout on one surface thereof. As the opening assisting means, for example, a tear tape or the like can be exemplified in addition to the perforations shown in the figure. Although not shown, the bag 41 for the bag-in-box of the present invention is housed inside the outer box 41, and its spout is located directly below the unsealing assisting means 43 which is to be an opening.
Since the spout must be pulled out from the opening after opening,
It is not fixed to the outer box. The material of the outer box is not particularly limited, and for example, corrugated cardboard can be used.

As shown in FIG. 9B, when the bag-in box 202 is opened, the opening 44 is formed. The shape of the opening is not particularly limited, and examples thereof include a circle, an ellipse, a quadrangle, a hexagon, and an octagon. The diameter d of the opening 44 is large enough to pull out the spout 12 with the cap 13 and the bag body 1 around the spout. When the spout and the bag body around the spout are sufficiently pulled out from the opening in this manner, the spout is surrounded by a funnel shape, and folds and wrinkles around the spout are reduced. Therefore, the residual liquid easily collects at the spout, the drainage is smooth, and the pulsation is small. Moreover, since the spout can be handled like a tip of a hose, the outflow direction of the contents can be controlled. In addition, it is easy to check the amount of residual liquid near the spout.

The length e of the bag body around the spout to be pulled out from the opening is preferably 50 mm or more, particularly 6 mm.
It is preferably 0 mm or more. On the other hand, even if the length e is increased to a certain length or more, it is not as convenient as it is, but rather the pouring port becomes an obstacle or the diameter d of the opening needs to be extremely large. For this reason, 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. Although the specific size of the diameter d with which the bag body 1 around the spout can be pulled out by 50 mm or more, preferably 50 to 150 mm, is to be appropriately determined,
If the diameter is set in the range of 50 to 150 mm, the bag body can be pulled out to an appropriate length. Here, "diameter" means
A circular shape means a diameter, and a shape other than that means a short diameter.

According to the unsealing assisting means 43 shown in FIGS. 10 (A) and 10 (B), the wall surface of the outer box 41 can be radially torn from a position which should be the center point of the opening, and the opening is opened after unsealing. 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 4
Because it is pressed down or supported by 5,
The position of the spout 12 becomes stable.

11 (A) to 11 (C) show an example of a bag-in-box including the outer box 41 having the opening assisting means 43 as described above and the bag-in-box bag of the present invention. As shown in FIG. 11A, the outer box 41 has a pair of inner flaps 46, 46 and outer flaps 47, 47 at the top. The inner flaps 46, 46 are notched in a substantially arc shape so as not to interfere with the outlet 12 of the inner bag housed in the box and the bag body 1 around the outlet, When the inner flaps 46, 46 are closed, a substantially semicircular cutout is formed.
Further, the one outer flap 47 is provided with the unsealing assisting means 43 at a position where the spout 12 abuts. The inner flaps 46, 46 and the outer flaps 47, 47 are sequentially closed, and then the outer box is enclosed without fixing the spout to the outer box, thereby completing the bag-in-box 204 as shown in FIG. 11B. To do. And bag in box 2
If the opening assisting portion 43 of 04 is used, the opening 44 having a predetermined size can be opened, and as shown in FIG. 11C, the spout 12 and the bag body 1 around the spout can be pulled out. .

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

[0092]

[Examples] Experimental examples are shown below. Experimental Example 1 A four-side sealed bag having the shape shown in FIG. 1 was prepared. This bag has a capacity of 20 liters and is [stretched nylon (ON)
15 μm / polyethylene (PE) 20 μm / linear low-density polyethylene (LLDPE) 60 μm] film and 60
It has a plane part and a side part made of a LLDPE film of μm. The dimensions are the actual dimensions excluding the seal width, the horizontal dimension of the flat surface portion is 300 mm, the horizontal dimension of the side surface portion is 220 mm, the vertical dimension of the flat surface portion and the side surface portion is 575 mm, and the width of the folded gusset is 110 mm. is there. The top fin side is 110 mm along the top and 1 side along the side.
At 31 mm, the narrow angle enclosed by the top seal and the closure seal is 50 °. The fin portion on the bottom side has a length of 110 mm on both sides along the bottom and sides, and the narrow angle surrounded by the bottom seal portion and the closing seal portion is 45 °.

The bag was stored in a special BIB (bag-in-box) outer box, filled with water, and then drained from the spout portion. At the beginning of draining, hold both ends of the box with your hands, support the box by putting the bottom edge of the box on the spout side against the edge of the container that receives water, and tilt the box as the water in the box decreases. Drained. After that, while keeping the box horizontal by hand, the spout was placed directly below and waited until the water was completely drained. When the water was about to run out, the box was gently shaken back and forth and left and right to make it easier to drain the water. After the drainage was completed, the lid of the box was opened and the condition of the bag was observed.

As a result, no outwardly bent portion of the bag in which the residual liquid was accumulated was observed. The empty bag was taken out, turned upside down, and after receiving the residual liquid in the beaker, it was weighed with a graduated cylinder.

When the above operation was repeated 5 times, the residual liquid was substantially zero to 10 ml, which was a very good result, and it was confirmed that this bag had a structure in which the residual liquid did not accumulate.

It is estimated that the measured residual liquid was formed by collecting water attached to the inside of the bag. Experimental Example 2 When the same test as in Experimental Example 1 was performed on the bag body having the shape of FIG. 1 and the capacity of 10 liters and 5 liters, the same result was obtained.

The bag having a capacity of 10 liters used here is
It has a flat surface portion and a side surface portion made of the same two films as in Experimental Example 1. The dimensions are the actual dimensions excluding the seal width, the horizontal dimension of the plane portion is 230 mm, the lateral dimension of the side surface portion is 180 mm,
The vertical dimension of the flat surface portion and the side surface portion is 464 mm, and the width of the folded gusset is 90 mm. The fin portion on the top side has a side of 90 mm along the top and 10 sides along the side surface.
At 8 mm, the narrow angle enclosed by the top seal and the closure seal is 50 °. The fin portion on the bottom side has a width of 90 mm on both sides along the bottom and sides, and the narrow angle surrounded by the bottom seal portion and the closing seal portion is 45 °.

Further, the bag body having a capacity of 5 liters also has a flat surface portion and a side surface portion which are made of the same two films as in Experimental Example 1. The dimensions are the actual dimensions excluding the seal width, the horizontal dimension of the flat portion is 230 mm, the horizontal dimension of the side portion is 180 mm, the vertical dimension of the flat portion and the side portion is 331 mm, and the width of the folded gusset is 90 mm. is there. The fin part on the top side has a side of 90 mm along the top and a side of 108 mm along the side.
In mm, the narrow angle enclosed by the top seal and the closure seal is 50 °. The fin portion on the bottom side has a width of 90 mm on both sides along the bottom and sides, and the narrow angle surrounded by the bottom seal portion and the closing seal portion is 45 °.

Comparative Example 1 A commercially available flat pouch bag having a capacity of 20 liters was placed in a dedicated BIB outer box and filled with water, and then the same test as in Experimental Example 1 was conducted. As a result, the drainage was poor even near the end of drainage, and the outflow of water continued. After the liquid was cut off, the lid of the box was opened and the appearance was observed. As a result, both corners of the upper surface and the bottom corner of the bag were unevenly bent in a triangular shape, and water was accumulated there.

When the residual liquid was weighed by repeating the same operation 5 times, the residual liquid amount was 100 to 200 ml, which was considerably large. The variation in the amount of residual liquid is large because the shape of the triangularly bent parts formed at both corners of the top and bottom of the bag is irregular, and the amount of residual liquid accumulated there varies greatly. It is estimated to be because.

[0101]

As described above, in the bag body for bag-in-box of the present invention, the closing seal portion is provided at each corner of the pillar-shaped bag body so as to cut the corner diagonally. Therefore, it takes the shape of a rectangular parallelepiped or a cube, and is formed of several synthetic resin films. Therefore, there is very little wasted space with the outer box when it is stored in the outer box, it is difficult to move inside the outer box, and it has a multiple structure, so that the bag is damaged by shock or vibration during transportation and storage. Is hard to burst or break. The closed seal also improves impact resistance by stress distribution.

Further, the bag body for bag-in-box of the present invention has a structure in which the filled contents cannot enter each corner, and therefore each corner is bent when it is stored in the outer box. However, the residual liquid does not collect in the corners, and the residual liquid discharge performance is improved. In particular, in the bag of the present invention, the narrow angle sandwiched between the top seal portion and the closed seal portion is 45 to 55 °, and the narrow angle sandwiched between the bottom seal portion and the closed seal portion is 40 to 50 °.
In this case, a closed seal can be formed on both the top and bottom along the position where the even part bends, so that the residual liquid storage caused by the bent part of the even part can be retained while maximizing the filling space in the bag. It can be sufficiently prevented.

The triangular fin portion formed by blocking each even portion from the inner space of the bag body is essentially an unnecessary portion, but it can be utilized. That is, when the opposite vertices of the front and rear corners of the bag body are adhered to each other, not only the triangular fins do not get in the way but also rubbing, tearing and pinholes on the bag wall are prevented. It Further, it is also possible to partially bond the front and rear fin portions facing each other, or to punch holes in the triangular fin portions and use them as the hanging portions.

Further, the bag body for bag-in-box according to the present invention has a shape close to a cube or a rectangular parallelepiped when filled with the liquid as the content, and therefore has excellent self-standing property and is easy to handle. Then, when a strip-shaped film piece is adhered to the body portion of the bag body so as to extend in the vertical direction or a band-shaped gas-filled layer is provided, since the body portion of the bag is stiff, further self-supporting property is obtained. Improved and easier to handle.

In the present invention, the bag body is formed into a rectangular parallelepiped when the contents are filled, and the dimension thereof is (f-1) the actual dimension excluding the width of the seal portion, and the lateral dimension of the flat portion is 260.
~ 340 mm, the lateral dimension of the side surface is 180-260 m
m, and the vertical dimension of the flat surface portion and the side surface portion is 490 to
Or (f-2) the actual dimension excluding the width of the seal portion, and the lateral dimension of the flat portion is 19 mm.
0-270 mm, the lateral dimension of the side surface is 140-220
mm, and the vertical dimension of the flat surface portion and the side surface portion is 330.
If it is set to ~ 600 mm, it can be stacked on a pallet of international standard without gaps, and it is compact and has excellent strength and stability, and the stability and strength of stacked piles are excellent. You get a box.

On the other hand, the bag-in-box of the present invention is provided with a spout at the bag-in-box bag of the present invention or a bag-in-box outer box having a four-side sealed bag made of a synthetic resin film as an inner bag. Since it is possible to form an opening that can pull out the bag body around 50 mm or more, the amount of residual liquid is reduced, pulsation at the time of outflow is prevented, the direction of outflow is controlled, and the visibility of the amount of remaining liquid is improved. be able to. In particular,
If a fan-shaped tear piece is left around the opening, the pouring position is stable.

[Brief description of drawings]

FIG. 1 is a front view showing a folded state of an example of a bag body for a bag-in-box according to the present invention.

FIG. 2 is a perspective view showing a state in which the bag body of FIG. 1 is filled with contents.

FIG. 3 is a view schematically showing a horizontal cross section of the bag body in FIG. 1 in a filled state.

FIG. 4 is a perspective view showing a state in which another example of the bag body for bag-in-box of the present invention is filled with contents.

FIG. 5 is a perspective view showing a state in which another example of the bag body for bag-in-box of the present invention is filled with contents.

FIG. 6 is a perspective view showing a state in which another example of the bag body for bag-in-box of the present invention is filled with contents.

FIG. 7 is a diagram schematically showing a cross section of a plane portion with a gas filling layer.

FIG. 8 is a perspective view showing a state where the bag-in-box containing the bag-in-box body of the present invention is stacked on a pallet.

FIG. 9 is an explanatory diagram showing an example of the bag-in-box of the present invention. (A) shows a state before opening, and (B) shows a state where the spout is pulled out after opening.

FIG. 10 is an explanatory view showing another example of the bag-in-box of the present invention. (A) shows the state before opening, (B)
Shows the state where the spout is pulled out after opening.

FIG. 11 is an explanatory diagram showing another example of the bag-in-box of the present invention. (A) shows a stage of assembling the bag-in-box, (B) shows a completed state, (C)
Shows the state where the spout is pulled out after opening.

FIG. 12 is a perspective view showing an example of a conventional inner bag for a bag-in-box.

13 is a diagram showing a state where the inner bag of FIG. 12 is housed in an outer box.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Bag main body 2 ... Front plane part 2-a ... Outer film 2-a1 ... Outer film outer layer 2-a2 ... Outer film middle layer 2-a3 ... Outer film inner layer 2-b ... Inner film 3 ... rear flat surface part 4 ... corner part 5 ... side surface part 6 ... valley fold line 7 ... top seal part 8 ... bottom seal part 9 ... side seal part 10 ... closed seal part 11 ... triangular fin part 12 ... spout 13 ... Cap 14 ... Punch hole 15 ... Inner space of bag 16 ... Space between synthetic resin films 17 ... Locally bonded portion 31 ... Strip film piece 32 ... Strip gas filling layer 33 ... Unbonded portion 34 ... Gas Impermeable film 35 ... Gas inlet 36 ... Gas inlet 41 ... Outer box 42 ... Space between outer box and inner bag 43 ... Opening assisting means 44 ... Opening 45 ... Fan-shaped fragment 46 ... Inner flap 47 ... Outer flap DESCRIPTION OF SYMBOLS 1 ... Pallet 62 ... Gap 101, 102, 103 and 104 ... Bag-in-box bag body 201, 202, 203 and 204 of the present invention ... Bag-in-box 501 ... Conventional bag-in-box inner bag P ... On top seal part And an arbitrary position on the bottom seal part Q ... an arbitrary position on the side seal part R ... an apex of a corner m ... a narrow angle sandwiched between the top seal part or the bottom seal part and the closing seal part m1 ... the top sealing part and closing Narrow angle sandwiched between the seal part m2 ... Narrow angle sandwiched between the bottom seal part and the closed seal part n ... Narrow angle sandwiched between the side seal part and the closed seal part n1 ... Side seal part and the top side Narrow angle sandwiched between the closed seal part n2 ... Narrow angle sandwiched between the side seal part and the bottom side seal part d ... Diameter of opening e ... Length of the main body pulled out

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuru Oba 1-1, Suzuki-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Ajinomoto Co., Inc.

Claims (14)

[Claims] 1. A bag having: (a) a pair of opposed flat surfaces forming a front side and a back side of the bag; and two side surfaces formed so as to have valley fold lines folded inward in a fold shape. The bag body of the four-way seal has a closing seal portion and a triangular fin portion at each corner portion, and (b) at least the flat surface portion and the side surface portion forming the bag body are overlapped in a non-bonded state. It is formed of two synthetic resin films, and (c) the closure seal part has two side surface parts provided with the valley fold line between a pair of flat surface parts of the bag body that overlap each other. The inner surfaces of the bag main body that face each other in a folded state so as to intervene between the top seal part and the bottom seal part from any position to a side seal part in a straight strip shape. To be glued to Was formed by
(D) The triangular fin portion is formed by being surrounded by any one of the top sealing portion and the bottom sealing portion, the side sealing portion, and the closing sealing portion. Bag body for bag-in-box. 2. The bag body for a bag-in-box according to claim 1, wherein the facing apexes of the front and rear corners of the bag body are bonded to each other. 3. A strip-shaped film piece is adhered or a strip-shaped gas-filled layer is provided so that at least one is provided on each of the pair of flat portions and the two side surface portions so as to extend in the vertical direction of the bag body. The bag body for bag-in-box according to claim 1. 4. A pair of left and right suspending portions are formed on at least one of the top side and the bottom side of the bag body, and the suspending portions are triangular fin portions on the front side and the rear side facing each other. The bag body for bag-in-box according to claim 1, wherein the bag-in-box bag body is formed by adhering the two at the apex positions of the corners and at least one position on the top seal part or the bottom seal part. 5. The bag body for a bag-in-box according to claim 1, wherein punch holes are formed in at least one triangular fin portion. 6. The bag body for a bag-in-box according to claim 1, wherein at least one layer in the synthetic resin film is a metal foil layer. 7. (e) The narrow angle sandwiched between the top seal portion and the closed seal portion is 45 to 55 °, and the narrow angle sandwiched between the bottom seal portion and the closed seal portion is 40 to 50 °. The bag body for bag-in-box according to claim 1, characterized in that. 8. (f-1) The actual dimension excluding the width of the seal portion, the lateral dimension of the plane portion is 260 to 340 mm, the lateral dimension of the side surface portion is 180 to 260 mm, and the planar portion and the side surface. The vertical dimension of the part is 490 to 660 mm,
(G) The bag body for bag-in-box according to claim 1, wherein the bag body is a rectangular parallelepiped when the contents are filled. 9. (f-2) The actual dimension excluding the width of the seal portion, the lateral dimension of the plane portion is 190 to 270 mm, the lateral dimension of the side surface portion is 140 to 220 mm, and the planar portion and the side surface. The vertical dimension of the part is 330 to 600 mm,
(G) The bag body for bag-in-box according to claim 1, wherein the bag body is a rectangular parallelepiped when the contents are filled. 10. The bag body for bag-in-box according to any one of claims 1 to 9, which is provided with a spout inside the outer box, is housed as an inner bag. When projecting the spout of the bag, move the bag body around the spout to 50 m.
A bag-in-box, comprising an opening assisting means for forming an opening having a diameter capable of being pulled out by m or more. 11. An inner bag having a spout and a four-way seal made of a synthetic resin film is housed inside the outer box, and when the spout of the inner bag is projected on one surface of the outer box. A bag-in-box, wherein the bag-in-box is provided with an opening assisting means for forming an opening having a diameter capable of pulling out the bag body around the pouring outlet by 50 mm or more. 12. The bag-in-box according to claim 11, wherein the inner bag is a flat bag. 13. The unsealing aid has one surface of an outer box,
12. The opening assisting means capable of being radially torn from a position which should be the center point of the opening, and leaving a fan-shaped piece around the opening after opening, the opening assisting means. Bag-in-box according to any one. 14. The inner bag has a capacity of 5 to 25 liters, and the outer box is a cube or a rectangular parallelepiped.
Bag-in-box according to any one of.