JP2001278339A - Internal bag of bag-in-box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal bag of a bag-in-box which is compatibly excellent in the self-standing property and the practical strength of the internal bag when the internal bag of the bag-in-box is handled without any external box, less in the quantity of the remaining liquid when the liquid is discharged, easy to hold a container, excellent in the handling property of the container and the convenience, and high in the strength. SOLUTION: In the internal bag of the bag-in-box comprising a self-standing bag formed by bonding a front film and a rear film with a fill and drain port and a bottom side film folded between the two kinds of films, the internal bag of the bag-in-box has a corner portion demarcated by a storage part by a bonded portion on an upper portion thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises an inner bag formed by fusing a synthetic resin film into a bag and an outer box such as a cardboard for filling, storing and transporting a liquid. More specifically, regarding the improvement of the usability of a liquid container generally called a bag-in-box, when the inner bag filled with liquid is handled without an outer box, the inner bag has both excellent independence and strength, and the contents The present invention relates to a reduction in residual liquid in a container upon discharging a product, and to an improvement in ease of holding an inner bag filled with liquid.

[0002]

2. Description of the Related Art Conventionally, a bag-in-box is generally composed of an inner bag formed by fusing a synthetic resin film into a bag and an outer box such as a cardboard for filling, storing and transporting a liquid. 2. Description of the Related Art A liquid container of about 5 to 20 liters called a liquid container is widely used as a container for food and medicine. These containers are mainly used for business purposes, and are used as raw materials containers for foods and chemicals and as large containers for subdivision. In many cases, it is necessary to take out only the inner bag from the outer box and bring it to the manufacturing site to prevent the outer box from contaminating the site. However, the inner bag made of ordinary synthetic resin film is a square flat bag shape with four sides sealed, and when handling the filled inner bag without an outer box, there is no autonomy, Further, since there is no portion to be used as a handle, the usability is very poor. In addition, this flat bag-shaped inner bag has a drawback that when the contents are discharged, particularly when the contents are discharged while being set in an outer box, the contents are likely to remain between the films at the corners of the bag. For this reason, users of the bag-in-box have demanded a bag-in-box that is self-supporting of the container only with the inner bag, has good handleability, and has little residual liquid in the contents.

[0003] Regarding self-sufficiency, it is conceivable to use the inner container of a bag-in-box of a shape-retaining container formed by blow molding, vacuum molding, or the like. Therefore, there is a demand for an inexpensive bag-in-bag bag made of film that is excellent in disposability and inexpensive. The gusset-shaped inner bag as disclosed in Japanese Utility Model Application Laid-Open No. 64-9174 has a certain degree of container autonomy when taken out of the outer box, and as shown in Japanese Utility Model Application Laid-Open No. 2-8736. The gusset-shaped inner bag can be used as a handle at the upper folded portion, and is a preferable form than a flat bag (see FIGS. 11 and 12). However, even with this gusset shape, the filled bag has a shape in which the body is swelled more than the bottom, so that the center of gravity is high and the self-sustainability is insufficient. Also, when discharging the contents without an outer box, it is difficult to work without holding the container with one hand, so the gusset-shaped inner bag is not easy to hold when the upper folded part is gripped It is.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and is excellent in an inner bag when a filled bag-in-box is handled without an outer box. The bag-in-a-box inner bag has both self-sustainability and practical strength, and has little residual liquid at the time of liquid discharge, makes the container easy to hold, has excellent container handling and convenience, and has high strength. The purpose is to get.

[0005]

A bag-in-box inner bag according to the present invention comprises a self-standing bag in which a front film having a spout, a rear film, and a bottom film folded between the two types of films are fused. It is a bag-in-box inner bag, wherein the bag-in-box inner bag has a corner portion separated from a storage portion by a fusion portion at an upper portion.

That is, in the inner bag of the present invention, the bottom film folded inward is inserted between the two types of films, the front film and the rear film, and the side edges thereof are fused. It has a so-called standing pouch shape, which is flat and does not take up space when folded in an empty bag, but when filled with liquid, the bottom film opens to make the inner bag excellent and self-supporting Can be done. Furthermore, if the inner bag is turned upside down and the inner bag is turned upside down by providing a fusion portion at an angle from the side edge toward the upper edge to divide the storage portion and form a corner portion, the upper portion of the inner bag remains. The liquid can be eliminated. When a hole is provided in this corner portion, the hole functions as a handle, and it is easy to hold the filled inner bag without carrying an outer box or when discharging the contents, so that handling becomes extremely good. preferable. The periphery of the hole may or may not be fused, but if not fused, the strength is improved, the action as a handle can be made more reliable, and the load on the fingers is reduced. Further, instead of providing a hole in the corner portion, a separate handle portion may be provided above the upper fused portion.

[0007] The bottom film of the inner bag according to the present invention is rectangular or square.
There is a Doipack (registered trademark) type with a single line bottom seal and a so-called square bottom bag type with a diagonally fused portion. Among them, when the inner bag is a square bottom bag, the contents are filled. It is preferable to place it in the outer box because it can be stabilized. Further, the lower part of the inner bag of the present invention has the bottom film folded inward between the front and rear films and the periphery thereof is fused, but the intersection or intersection of the fold of the bottom film with the front or rear film is provided. It is preferable to fuse obliquely from the vicinity of the lower side to an appropriate position of the bottom fusion part of the inner bag.

The bottom film of the inner bag of the bag-in-box according to the present invention is hardly heat-sealed to a surface of, for example, a co-extruded film of a polyamide resin and a polyolefin resin or a biaxially stretched film laminated with a polyolefin resin layer. When the resin layer is laminated, a hole is provided in the bottom film at a position corresponding to the side edge fusion surface at a position below the intersection near the intersection of the oblique fusion portion and the side edge fusion portion. By fusing the side edge fusing part by cutting it out by such a method, it is possible to make a structure in which the film on the front surface and the rear surface at that position are fused, and by filling the contents, the bottom film Opens to form the bottom of the bag three-dimensionally, giving the filled bag excellent self-sustainability, and the oblique fusion portion allows the residual liquid between the films at the bottom corners of the bag when the liquid is discharged. Without It is possible.

[0009] Further, even when a laminate film having a base film made of a hardly stretchable film such as a biaxially stretched film is used as the bottom film, the obliquely fused portion and the side edge fused portion can be used. The film on the front and rear sides below the point of intersection is fused, which prevents the bottom film from opening when internal pressure is applied to the bag, and fuses the folds and side edges of the bottom film The stress applied to the intersection of the parts can be reduced, and the practical strength against impacts such as falling can be increased. In addition, a similar notch is provided further below the notch, preferably at the corner.
By opening more than one piece and making the film of the front and rear surfaces of the bag in that part also fused, the inner bag can be made more shape-retaining and self-sustaining, and the inner pressure can be reduced Since the effect of preventing the bottom film from opening when it is applied increases, the practical strength against impacts such as dropping can be further increased.

[0010] Further, by cutting off the lower corner of the outside of the oblique fusion portion along the substantially oblique seal portion, the bottom film of the bag can be easily opened at the time of filling the contents, thereby making the filling easier. be able to. However, if this part is cut off, the self-sustainability and the drop resistance of the bag become negative, so it is necessary to appropriately select the bag according to the material composition of the bag and the required function level. When the bottom film of the inner bag is a laminate in which a resin layer that is difficult to be heat-sealed is formed as a surface layer, the front surface near the lower side of the intersection of the oblique fusion portion and the side edge fusion portion. It is preferable to cut off the lower corner, leaving a portion where the and the rear surface are fused.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail. As a material for the bag used in the present invention, a polyolefin film such as polyethylene or polypropylene may be used alone, but a laminate film may also be used. The laminate film is a laminate film having a heat-adhesive resin layer of a polyolefin such as polyethylene or polypropylene (CPP) as an inner layer. The laminate film is a comparative film such as biaxially stretched polyamide, biaxially stretched polyester, or biaxially stretched polypropylene. Films with mechanical strength are used as base materials, and in order to add necessary performance to these base materials, for example, when moisture resistance is required, silica-deposited films or ethylene-vinyl alcohol copolymers are required In such a case, a multilayer film is appropriately selected depending on the application, such as laminating an aluminum foil or an aluminum vapor-deposited film. To illustrate a multilayer film, for example,
There are a laminated film of aluminum foil and polyethylene, a multilayer film of ethylene / vinyl alcohol copolymer (EVOH) and polyethylene, a multilayer film of polyamide, EVOH and polyethylene, and the like. In addition, a double film or the like in which these films and a single film of polyethylene are laminated without bonding is appropriately used, but is not limited thereto.

[0012]

Embodiments and Comparative Examples One embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a bag-in-box inner bag according to the present invention, and are plan views in a state where the inner bag is folded. FIG. 4 shows the inner bag A of FIG.
It is sectional drawing of -A '. 1 to 4, 1 is an inner bag, 2 is an upper fusion part, 3 is a bottom fusion part, 4 is a folded bottom film, and 5 and 5 'are opened on the bottom film before fusion. 6 is the front film of the bag, 7
Denotes a rear film, 8 denotes a side edge fusion portion, 9 denotes a bottom oblique fusion portion, and 10 denotes an upper oblique fusion portion. Reference numeral 14 denotes a closure for discharging contents. The perforated holes 5, 5 'are previously opened in the folded bottom film 4 in the vicinity of the lower side of the intersection 12 between the side edge fusion portion 8 and the bottom oblique fusion portion, and then the side edge fusion is performed. The films on the front and rear sides of the location are fused. A handle hole 15 is formed outside the upper oblique fusion portion 10. FIG. 11 is a perspective view showing an example of a conventional gusset-shaped bag-in-box inner bag, and FIG. 12 shows an example of a conventional gusset-shaped bag-in-box inner bag filled.

FIG. 5 shows a state in which the liquid of the contents is filled in the inner bag of the bag-in-box of FIG. 3 without the outer box. Because the bottom film spreads and forms the bottom of the container, and because the entire bag goes down, the shape becomes wider,
The center of gravity is lowered, and excellent independence is obtained. Further, since the front and rear films of the bag are integrated by the through-hole fusion parts 5, 5 ', the film at the intersection 12 does not spread, and the practical strength is increased. FIG. 6 shows a state in which the bag in the bag-in-box of FIG. 3 filled with the contents liquid is taken out of the outer box and the contents are discharged, and the upper part of the bag is folded in two, and the upper handle hole is formed. It is easy to handle by overlapping and grasping with one hand and one corner of the bottom with the other hand. FIG. 7 shows another embodiment of the present invention, in which a bottom corner is cut away except a portion where the front film and the rear film are fused at the bottom. FIGS. 8 and 9 show another embodiment of the present invention, in which a handle portion 16 is formed above the upper fused portion 2. FIG. 10 is a perspective view showing a state in which the contents are discharged while being set in the outer box.

[0014]

As described above, in the bag-in-in-bag according to the present invention, the film serving as the bottom surface is folded inward between the front and rear films at the lower portion of the bag, and the periphery is fused and folded. From the intersection of the bottom film with the fold of the bottom film of the side film fusion part of the side of the bag where the bottom film is fused with the front and rear films, or near the lower part of the intersection, to the appropriate position of the bottom fusion of the bag. A hole is formed in the bottom film at a position corresponding to the side edge fusion surface at a position below the intersection near the intersection of the oblique fusion portion and the side edge fusion portion. By performing side edge fusion, the front and rear films at that position are fused to form a structure.
Gives the filled bag excellent independence, eliminates the residual liquid between the films at the bottom corner of the bag at the time of liquid discharge, and when the internal pressure is applied to the bag, the crease and side of the bottom film Practical strength against impacts such as falling can be increased by reducing the stress applied to the intersection of the edge fusion. Also, by providing diagonal fusion at both corners of the upper part of the bag that connects the upper fusion part and the side edge fusion part of the bag, the upper part of the inner bag is discharged when the liquid is discharged by turning the inner bag upside down. The residual liquid in the corner can be eliminated.
In addition, near the lower side of the intersection of the oblique fusion at the lower portion of the bag and the side edge fusion portion, a hole is provided in the bottom film to perform side edge fusion, leaving a portion where the front and rear films are fused. Then, by cutting off the outer part of the oblique fusion along the substantially oblique fusion portion, the bottom film can be easily opened and the filling can be facilitated. In addition, by opening holes for handles outside the oblique fusion connecting the upper fusion part and the side edge fusion part of the bag at both upper corners of the bag, it is easy to hold the filled inner bag without an outer box can do.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a bag-in-box inner bag of the present invention, in a state where the inner bag is folded.

FIG. 2 is a plan view showing another embodiment of the bag-in-box inner bag of the present invention, in a state where the inner bag is folded.

FIG. 3 is a plan view showing another embodiment of the bag-in-box inner bag according to the present invention, in a state where the inner bag is folded.

FIG. 4 is a sectional view taken along line A-A 'of the inner bag of FIG.

5 shows a state in which the liquid in the contents is filled in the bag-in-box inner bag of FIG. 1 without an outer box.

FIG. 6 shows a state in which the bag in the bag-in-box of FIG. 1 filled with the contents liquid is taken out of the outer box and the contents are discharged.

FIG. 7 is another embodiment of the present invention.

FIG. 8 is another embodiment of the present invention.

FIG. 9 is another embodiment of the present invention.

FIG. 10 is a perspective view showing a state in which the contents are discharged while being set in the outer box.

FIG. 11 is a perspective view showing an example of a conventional gusset-shaped bag-in-box inner bag.

FIG. 12 shows an example of a bag-in-box inner bag of a conventional gusset bag shape filled.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inner bag 2 Top fusion part 3 Bottom fusion part 4 Folded bottom film 5, 5 'Through-hole opened in bottom film before fusion 6 Front film of bag 7 Rear film 8
Side edge fusion part 9 Bottom diagonal fusion part 10 Upper diagonal fusion part 12 Intersection point 14 Closure for pouring and discharging contents liquid 15 Handle hole 16 Handle part 17 Outer box

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E064 AB13 AB14 AB15 AB25 BA24 BA25 BA30 BA36 BB03 BB10 BC07 BC14 BC18 EA09 HF09 HG03 HG06 HJ02 HM01 HN05 HN65 HR01 HS04 3E067 AA03 AC01 BA05C BA12B BB40 BB40 FB40 CB40

Claims (5)

[Claims] 1. A bag-in-box inner bag comprising a self-standing bag in which a front film having a spout, a rear film, and a bottom film folded between the two types of films are fused. A bag-in-box inner bag, wherein the bag has a corner portion separated from the storage portion by a fusion portion at an upper portion. 2. The bag-in-box inner bag according to claim 1, wherein a hole is provided in at least one of the corner portions. 3. The bag-in-a-box inner bag according to claim 1, wherein the self-standing bag is a square bottom bag. 4. The bag-in-box inner bag according to claim 3, wherein the lower triangular portion of the square bottom bag is cut and removed. 5. A laminate in which a resin layer to which the bottom film is difficult to be thermally fused is laminated so as to be a surface layer, and the bottom film is cut at or near an intersection of a side edge and a polygonal line of the bottom film. The bag-in-box inner bag according to any one of claims 1 to 4, wherein the front film and the rear film are fused and chipped.