WO2001064536A1 - Inner bag for bag-in-box - Google Patents

Abstract

An inner bag for bag-in-box capable of increasing an easiness in handling and convenience when a filled inner bag (1) for bag-in-box is handled without an outer box, wherein reinforcing fused parts (5, 5') formed by cutting out side films (4, 4') and fusing a front film (6) with a rear film are provided continuously or closely to tip fused parts (2, 3) on an upper side and/or a lower side of the inner bag, or a holding part is provided formed by fusing the front film (6) with the rear film through or without through the side films (4, 4') so that an unfused part (17) between the side films (4, 4') is formed at or near at least one corner part between the films and the tip fused parts (2, 3) and so that, when a hand is accessed from the side part of the inner bag (1), fingers are passed to the outside of the inner bag (1) through the unfused part (17).

Description

 Technical details Inner box inner bag Technical field

 The present invention relates to an improvement in the handleability of a metal box made up of an inner bag made of a synthetic resin film and an outer box made of cardboard or the like. In particular, it relates to an improved bag-in-box inner bag having a gusset portion.

 Background art

 Conventionally, a synthetic resin film for filling, storing and transporting liquids such as liquids and powders has been heat-sealed into a bag-shaped inner bag and an outer box made of cardboard, etc. Such containers are generally called bag-in-boxes, and containers having a capacity of about 51 to 201 are widely used as food and medicine containers. These containers are mainly used for business purposes, and are used as raw material containers for foods and chemicals and as large containers for subdivision.

 On the other hand, recently, in order to thoroughly control the hygiene of food and medicine production sites, we want to take out only the filled inner bag from the outer box and bring it to the production site to prevent contamination of the site by dust generated from the outer box. Demands are becoming stronger.

 Therefore, it is becoming increasingly necessary to handle the inner bag of these boxes without the outer box.

At the same time, the inner bag of the Nuggin Box is a highly self-sustaining molding type that is made by blow molding or vacuum molding synthetic resin. There is an inner bag and a film-type inner bag that uses a small amount of synthetic resin obtained by heat-sealing the film. Furthermore, film types are divided into flat bags and gazette bags according to their shape.

 Although such gusset-shaped inner bags are not as good as molded types, they are more self-contained as containers than flat bag types, so they can be handled without an outer box. I like it.

 However, the gazette-type bag-in-box has several problems, one of which is the strength problem. '

 For example, Japanese Unexamined Patent Publication (Kokai) No. 64-19174 (see Fig. 7) discloses a gusseted shape in which both side edges of the bag body are folded inward to form a gusset portion. It is shown.

As shown in this publication, the gusset-shaped bag, as shown in Japanese Patent Application Laid-Open No. 6-9-1174, has a fold at the fold of the film on the side when filled with liquid. Has a drawback that stress concentration occurs at the intersection of the upper and lower sides and the welded portion, and is weak against stresses such as internal pressure.

For this reason, in the above-cited Japanese Patent Publication No. 6-9-1174, the oblique band-like fusion is carried out from the intersection of the fold of the fold and the fusion part on the upper side or the lower side to an appropriate position on both sides of the bag. It is said that the provision of the section increases the strength of the intersection. The provision of this oblique band-like fusion portion is effective in preventing the liquid from remaining between the films at the corners of the inner bag when discharging the liquid, and in reducing the residual liquid. However, simply providing this oblique band-like fusion joint may cause damage due to insufficient strength when a severe impact such as dropping is applied to the inner bag. Japanese Utility Model Application Laid-Open Publication No. It only states that a pressurized pouring method in which the tensile tension is dispersed uniformly and pressure is applied to the outer surface of the bag body to squeeze out the contents can be adopted. Further, the triangular portion outside the oblique band-like fusion portion may be opened when handling the filled bag, and the strength of the intersection may be reduced.

 In addition, this triangular portion may hinder the filling of the filled inner bag into the outer box.

 Further, in order to enhance the independence, the triangular portion becomes hard and rebounds, and as a result, the independence is deteriorated when handling the filled 'inner bag without the exterior as described above.

 Meanwhile, Japanese Utility Model Application Laid-Open No. 64-91174 discloses that a triangular portion at the lower part of the inner bag is cut off in order to enhance independence. There was a problem in that dropping made it easier for the intersection to open, and the strength against internal pressure was rather weakened. One of the problems is that in order to improve the strength of the inner bag, the film on the side to be folded is made of a biaxially stretched film, a nylon resin layer, or other resin layer that is difficult to be heat-sealed. This is often seen when using a laminate that is laminated so as to be a surface layer, and is an obstacle to improving the strength of the gusset-shaped bag-in-box inner bag.

Another problem is that when the filled inner bag is lifted and removed from the outer box, or when it is carried only with the inner bag, it is difficult to handle because there is no appropriate grip. In order to facilitate the handling of these items, the inner bag of the bag box, which has a handle as shown in Fig. 21, is actually open. It is shown in the publication No. 766. That is, at the same time as forming the upper fused portion of the gusset-shaped inner bag, a fused portion is formed such that the front film and the rear film are integrated at the corner of the inner bag. The part is grasped. However, when forming the fused portion at the corner, the present invention has a problem in that the entire upper side is fused in a straight line, so that there is no gap for the finger to come off, so that a burden is imposed on the fingertip.

 In addition, at the time of filling, there are cases where the outer bag is set after filling with the inner bag alone. At that time, handling the filled inner bag has the same problem as described above. '' Disclosure of the invention

The gusset-shaped inner bag for bag-in-box is inserted into the gusset part with the side films folded inward from both side edges between the front film and the rear film. Have been. The upper or lower fusion zone consists of two types of fusion zones. One is the part near the center where the front film and the rear film face each other, where the front film and the rear film are directly fused together (this fusion part The other is located on the outer side, and the front film and the side film or the rear film and the side film are fused. When forming the upper side or lower side welded portion composed of the portions that are formed, the two types of fused portions are simultaneously and continuously welded in a straight line. Normally, the film constituting the gusset-shaped inner bag is often made of a fusible film on the front and back surfaces, and the side films are also fused together at the folded part on the upper or lower side. However, in order to improve the strength of the inner bag, When a laminated body is used in which a resin layer, such as a biaxially stretched film or a nylon resin layer, which is difficult to be heat-sealed, is used as a surface layer, the side film is used. Lums are not fused together.

 The present invention has been made to solve the above problems in such a back-box. A first object of the present invention is to improve the strength without impairing the independence of the inner bag when the inner bag of the bag bag box filled is used without the outer box. . A second object of the present invention is to provide an inner bag for a back-in box, which is provided with an appropriate gripping portion and has improved handleability and convenience of the inner bag.

The first invention is a gusset-shaped bag-in-box inner bag made of a laminate in which a resin layer on which the film to be folded is hardly heat-sealed is formed as a surface layer. It is a preferred invention to apply, the gist of which is to cut out the side film continuously or close to the top and / or bottom fusion splice, and the front and rear films A nose-box inner bag characterized in that a reinforcing fusion-bonded portion is provided by fusion-bonding the above film. At that time, in the bag-in-box inner bag, even at the corner or near the corner, the side film is cut off and the front film and the rear film can be fused. I like it. Further, in the bag of the baguin box, it is preferable that a storage part for contents is divided by a fusion part to form a triangular fin part. At least one of the triangular fins may be cut and removed, and when cutting, it is particularly preferable to cut and remove all lower triangular fins. New The inner bag for bag-in box provided with a reinforced fusion spliced part where the front film and the rear film are fused together has the following advantages due to the above structure. Occurs. That is,

 (1) The front and rear films are fused by cutting out the side films so as to be continuous or adjacent to the top or bottom fused portion of the gusset-shaped bag-in-box inner bag. This prevents the side film near the top fused part on the upper or lower side from opening when internal pressure is applied to the inner bag due to an impact such as inadvertent dropping, etc. Load can be reduced. '

 (2) Furthermore, the front film and the rear film are fused at the corners or near the corners by cutting off the side films, so that the reinforcing effect described in (1) can be obtained. As the size of the film becomes larger, it is possible to prevent the film on the side surface from being damaged by contact with the inner surface of the outer box. Also, since the fused portion at the corner can be used as a gripping portion, it is suitable when the filled inner bag is taken in and out of the outer box, transported, and the contents are discharged.

 (3) By forming a gusset shape having a rectangular fin section separated from the storage section by the fusion section, the residual liquid at the time of discharging the contents can be reduced. Also, when forming the reinforcing fusion zone, even if the side film is cut out larger than the width of the upper side or lower side fusion zone, as long as the notched portion is inside the fin portion No liquid leakage.

(4) If the film that forms the inner bag is made of a hard material, the presence of the fin makes it difficult for the filled inner bag to be stored in the outer box. Or it may be difficult to close the lid or the independence may be reduced. Condition can be prevented. Further, the second invention is preferably applied to a gusset-shaped inner bag for a bag box formed by fusing one or a plurality of films, and the gist of the invention is as follows. At least at one corner or near the corner, the front and rear films are formed so that an unfused part between the side films is formed between the top film and the fused part. It is configured such that when the hand is inserted from the side of the inner bag, the finger is pulled out of the inner bag from the unfused part when the hand is inserted through the inner bag or not. This is an inner bag for a bag-box, characterized by having a grip portion made of: The gripping portions are preferably provided on both sides of the top fusion portion on the upper side and / or the lower side for further improvement in handleability and convenience. By providing a cutout portion from which a part or all of the unfused portion on the upper side and / or the lower side is removed, the load on the fingertip when gripped can be reduced. I prefer it. Then, a band-like fusion portion is provided at an arbitrary position on the side edge from the end of the top fusion portion on the upper side and / or the lower side, and a fin portion divided into a triangular shape is provided, and a grip portion is provided. It is preferable that the triangular fin is provided on the triangular fin, and the triangular fin on the lower side may be removed. Increase.

In the present invention, in such a gusset-shaped inner bag, the front and rear flaps are formed such that an unfused portion is formed at least at one corner or near the corner between the top fused portion. Film fused, so the front or rear film is closer than the side of the inner bag When the hand is inserted between the front film and the side film, the finger is pulled out from the unfused part between the front film and the rear film, so that the fingertip is strained. It can be gripped without any problem. Also, it is preferable to provide a grip portion, which is a fusion portion between the front film and the rear film, on both sides of the top fusion portion so that it can be grasped with both hands. .

 If only a single or co-extruded film with a heat-adhesive resin layer such as polyethylene or polypropylene on both sides is used as the side film, the front film is used at the corners. And the rear film can be fused through the side film. Therefore, in order to form the unfused portion of the side films, it is only necessary to seal the seal bar used for the upper or lower side with a notch for forming the unfused portion. Is fine. In the case of using a laminated body in which a resin layer, such as a polyimide resin layer or a biaxially stretched film, which is difficult to heat-bond, is used as the side film, the front film is formed at the corner. Part of the side film is cut into a circular or oval shape to fuse the rear film and the rear film. (Punch hole) The rear surface of the front film and the rear surface of the rear film are Fused without passing through the film. It is preferable that a plurality of punch holes are provided to improve the strength, and the unfused portion may be formed by widening the interval between the punch holes so that a finger can enter.

Thus, as described above, the present invention provides a front and rear film so as to form an unfused portion between at least one corner or a corner and a top fused portion. The handleability of the inner bag can be improved by fusing the If it exceeds 101, the film with high strength is adopted, and the waist becomes strong.Therefore, when the filled inner bag is lifted up by the grip, the film in the unfused part May be urged inward, causing the finger to be pinched and the film to bite into the finger. In order to reduce the burden on the finger, in the present invention, for example, an unfused portion is provided on the upper side or the lower side, and a cutout portion is provided in a part of the unfused portion. The finger can be pulled out through the part so that the grip part provided on the upper or lower part can be gripped. This makes it very easy to remove the inner bag from the outer box, carry it around, or discharge its contents. Similarly, the inner bag filled with the contents can be easily placed in the outer box. In addition, since a hole is formed on the upper side or the lower side by the notch, this notch may be hereinafter referred to as a handle hole. Further, the unfused portion may or may not be left around the handle hole. If an unfused portion is not left, a hole may be formed by fusing the entire side and then forming a handle hole.

In the present invention, in order to prevent leakage of contents due to the provision of the cutout portion, a band-like fusion portion is provided at an arbitrary position on the side edge from the end of the top fusion portion on the upper side and / or the lower side. It is also possible to provide a fin section which is provided in a triangular shape. In this case, part or all of the fin may be fused. The gripping part is provided on the triangular fin so that the contents do not remain in the corners when discharging the contents, and when the filled bag-in box is transported. It is preferred because it serves to protect the film. Furthermore, by removing the triangular fins on the lower side, the inner bag is The self-standing stability is improved when taking out and handling, and it can be easily stored in the outer box when stored in the outer box.

 The inner bag of the gusset-shaped bag-in-box of the present invention is formed by inserting the side film folded inside between the front film and the rear film as described above. It is a gusset-shaped bag that is fused around and has folds on the sides. Instead of using the front film, rear film, and side film, a tubular film is used. Using lumps, both sides may be folded inward, and the upper and lower ends may be fused by omitting the side fusion parts. '' Brief description of the drawings

 FIG. 1 is a plan view showing an embodiment of a bag of a bug box according to the first invention in a folded state.

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

 Fig. 3 is a bottom view of the bag in the bag box of Fig. 2 filled with the liquid of the contents, viewed from below.

 FIG. 4 is a plan view showing another embodiment of the inner bag for a bag-in-box according to the first invention.

 Fig. 5 is a view of the bag-in-box inner bag of Fig. 4 filled with liquid as viewed from below the bag.

 FIG. 6 is a plan view showing another embodiment of the inner bag for a bag-in-box according to the first invention.

Fig. 7 shows an example of a conventional gusseted bag-shaped inner bag with oblique fusion. Fig. 8 shows an example of the bag bag box inner bag in which the outside of the conventional gusset bag shape oblique fusion is removed.

 Fig. 9 shows a state in which the inner bag for bag-in box of Fig. 7 is filled with liquid as viewed from below the bag.

 FIG. 10 is a view of the bag-in-box inner bag of FIG. 8 filled with liquid as viewed from below the bag. FIG. 11 shows one embodiment of the bag-in-box inner bag of the second invention, and is a plan view in a folded state. '

 FIG. 12 is a plan view showing another embodiment of the bag of the present invention in a folded state.

 FIG. 13 is a plan view of a bag-in-box inner bag according to another embodiment of the second invention in a state where the bag-in-box inner bag provided with a cutout portion is folded.

 FIG. 14 shows another embodiment of the inner bag for a bag-in-box according to the second invention, in which the inner bag obtained by cutting off the triangular fin portion at the lower part of FIG. 14 is in a folded state. It is a top view.

 FIG. 15 is a perspective view of the bag-in-box inner bag of FIG. 14 when the liquid is filled therein.

 FIG. 16 is a plan view of another embodiment of the inner bag for a pug box according to the second invention, in which the inner bag having punched holes at the corners of the inner bag is folded. .

FIG. 17 is a plan view of another embodiment of the inner bag for a bag-in-box according to the second invention in a state where the inner bag is omitted in a state where a side fusion portion is omitted. FIG. 18 is a plan view of another embodiment of the bag-in-box inner bag according to the second invention, in which the side fusion portion is omitted, in which the inner bag is folded to form a Si.

 FIG. 19 is a partial plan view of another embodiment of the inner bag for a bag-in-box according to the second invention, in which a punch hole is provided near a corner portion and a top fusion portion of the inner bag. .

 FIG. 20 shows another embodiment of the inner bag for a bag-in-box according to the second invention, in which a punch hole is provided near the corner and the top fusion portion of the inner bag and a notch is provided. It is a partial plan view of a bag. '

 Fig. 21 shows the inner bag of a Knoggin box with a conventional handle. BEST MODE FOR CARRYING OUT THE INVENTION

 The present invention will be described in more detail.

As the material of the bag used in the first invention, a laminate such as a laminate film or a co-extruded film is used according to the required performance. Examples of laminates include films with relatively high mechanical strength, such as biaxially stretched polyamide, biaxially stretched polyester, and biaxially stretched polypropylene, and resin layers of polyimide. A laminate comprising a resin layer that is not easily heat-fused as a surface layer and an innermost layer composed of a polyolefin-based resin layer having a polyolefin-based thermal adhesive property such as polyethylene or polypropylene. It is. In order to add the required performance to these laminates, for example, when oxygen nobility is required, a silica vapor-deposited film or ethylene vinyl alcohol copolymer (EV0H) is used to shield light. If required, laminate or co-extrude aluminum foil or aluminum-deposited film. For example, a multilayer film, which is a laminated body, is appropriately selected depending on its use. Examples of the multilayer film include, for example, a laminate film of polyester, aluminum foil and polyethylene, a co-extruded multilayer film of EVOH and polyethylene, and a polyamide. And co-extruded multilayer films of EVOH and polyethylene. In addition, these films are used singly, or a double or more film obtained by laminating these films and a single film of polystyrene without bonding them is used as appropriate. O '

 In the present invention, the top fused part on the upper side and / or the lower side is a part where the front film and the rear film are directly fused on the upper side and / or the lower side. A notch is provided in the side film continuously or in close proximity to the front film, and the front film and the rear film are fused to form a reinforcing fused portion. The notch may have any shape such as a circle or an ellipse, and a plurality of notches may be provided to improve strength. In this case, it is preferable that the notch be provided at or near the corner of the inner bag.

 Further, it is preferable to provide a fusion portion toward the side edge from the end of the top fusion portion on the upper side and / or the lower side to separate the storage portion of the inner bag, so that the residual liquid can be reduced. New Then, it is preferable to cut and remove the outer triangular fin portion delimited by the fused portion for the reason described above. The first invention will be described with reference to the drawings.

Fig. 1 shows the bag-in-box inner bag of the present invention in a folded state. FIG.

In FIG. 1, 1 is an inner bag, 2 is a top side fusion splice, 3 is a lower side fusion splice, 4, 45 and ⁵ are folded side films, and 5 and 5 '. Reference numeral denotes a fusion splicing portion existing near the top side fusion splicing portion, 6 denotes a front film of the inner bag, and 7 denotes a fusion splicing portion that separates the storage portion and the fin portion. The front and rear films at the positions of these holes are fused by opening the through holes in the folded side films 4 and 4 'in advance and then welding the lower side. To form a reinforcing fused portion. In the figure, 8 and 10 are the intersections of the lower side fusion zone and the side film, 9 and 11 are the intersections of the upper fusion zone and the side film, and 12.2.12 'is The fold of the side film, 13 is a side edge fusion part, 14 is a rear film, and 15 is a spout.

 FIG. 2 shows a case where the side film near the corner is cut out and a corner fusion part 16 is provided in the bag bag of the bag box of FIG. Fig. 3 shows a state in which the liquid of the contents is filled in the bag of the bag box of Fig. 2 as viewed from the lower side of the bag. The front and rear films of the bag are integrated by the fusible parts at the corners in addition to the reinforced fused parts 5 and 5 ', so even if an impact is applied, the top fused part The nearby side film does not spread and the strength is increased.

 FIG. 4 shows a shape in which the outside of the fusion part 7 that separates the storage part and the fin part in FIG. 2 is cut off.

Fig. 5 shows the bag inside the bag box of Fig. 4 filled with the liquid of the contents as viewed from below the bag. As shown in Fig. 1, the front and back films of the bag are reinforced by the reinforced fusion parts 5, 5 '. Because it is integrated, the side film near the top fusion zone does not spread even when an impact is applied, increasing the strength.In addition, the fin has been removed The inner bag becomes stable and independent.

 FIG. 6 shows another embodiment of the present invention. In this case, all the fins were cut off.

 7 and 8 are plan views of a conventional gusset-shaped inner bag. Fig. 9 shows the inner bag shown in Fig. 7 filled with contents, and Fig. 10 shows the inner bag shown in Fig. 8 filled with contents. It is the figure seen from the lower part. In the case of Figs. 9 and 10, the side film near the top fusion part is easy to open, and the strength against internal pressure is weak. Next, the second invention will be described with reference to the drawings.

 FIG. 11 is a plan view showing a state where the inner bag for bag-in-box according to the second invention is folded. In FIG. 11, 17 is an unfused portion, 2 is a top fused portion on the upper side, 3 is a top fused portion on the lower side, 13 is a side fused portion, and 12 and 12 ′ are side flaps. Folding line of film, 15 is spout, 4 is side film, and 6 is front film. When a hand is inserted from the side in such an inner bag for a bag box, the fingertip can pass through the unfused portion 17 and grasp the fused portion at the corner. Similarly, for the lower side fusion, an unfused portion may be provided and fusion may be performed.

FIG. 12 is a plan view showing a state in which the inner bag for bag box of another embodiment of the present invention is folded. 18 Notch in Fig. 1 2 Reference numeral 7 denotes an oblique welding portion. When the fingertip is put out from the unfused part of the inner bag for the bag-in-box shown in Fig. 11 and the inner bag is gripped, the unfused part film may bite into the finger. In this case, a notch (handle hole) 18 is provided to reduce the number of holes. In order to prevent leakage of the contents from the notch (handle hole) 18, a fusion part 7 is provided diagonally from the end of the top fusion part to the side edge fusion part of each part. It is. By providing the notch portion (handle hole) 18 in this way, the upper side fused portion can be gripped easily and securely without any burden.

 FIG. 13 is a plan view of another embodiment of the present invention, in which the oblique welding portion 7 is provided also in the lower part. By providing the oblique fusion part 7 at the bottom, the residual liquid can be reduced when discharging the contents of the inner bag, and the side surface can be used when transporting the filled bag-in-box inner bag. Prevents damage due to film rubbing.

 Fig. 14 is a plan view of the inner bag of the 'Bug-in box' with the triangular fin formed by providing an oblique fusion part at the lower fusion part. By separating the triangular fins, independence is improved when the contents are filled in the bag.

 FIG. 15 is a perspective view of the bag-in-box inner bag of FIG. 14 when the contents are filled. In FIG. 15, the film on both sides on the upper fusion side spreads back and forth, so that a finger can be inserted into the handle hole from underneath and the filled inner bag can be easily lifted. If the handle hole is not opened, it is not easy to grasp and lift a large-capacity inner bag such as 201 with a burden on the fingertip.

 As a side film, a polyimide layer on the surface ゃ biaxially stretched film

Corrected form (Rule 91) When a laminated body with a resin layer that is not easily heat-sealed, such as a film, is used, a punch hole is provided in the side film, and the front film and the rear film are separated from each other by the side film. Weld without passing through. FIG. 16 is a plan view of a bag box inner bag using a laminate in which a resin layer that is difficult to heat-seal is laminated on the surface as a side film, and FIG. Punch holes are provided at the corners of the film. The front and rear films are integrated at the corners without passing through the side films at the corners, and the reinforcing fusion joints 16 A notch 18 is provided between the top fusion part and the corner fusion part to provide a handle function.

 FIG. 17 and FIG. 18 are plan views showing another embodiment of the present invention. These are all cases where the side fusion of the bag body is omitted.Such a bag is formed, for example, on both sides of a tubular film formed of an inflation tube or a back sticker. Is folded inward to form an inner fold, and the upper and lower parts are fused. Fig. 17 shows that a handle hole is formed in the triangle-shaped fin on the upper part of the bag where such side fusion is omitted, and a handle hole is formed in the lower triangle-shaped fin. It is a case where it is provided. Fig. 18 shows a bag without such side fusion, in which a reinforcing hole 16 is provided by punch holes near the upper corner and a handle hole is provided in the upper triangular fin. And the lower triangular fin is cut off.

Further, FIGS. 19 and 20 are partial views showing another embodiment of the present invention. Fig. 19 shows the case where a reinforcing welded part 16 was provided by punch holes near the corner and the end of the top welded part. Fig. 20 shows the case where two punches shown in Fig. 19 were used. This is a case where a notch 18 is provided between the provided reinforcing fusion parts 16. Article 19 Corrected Form (Rule 91) In the figure, since the space between the punch holes is not fused, the fingers can be put out from this part and can be gripped, but by providing the notch 18 between them as shown in Fig. 20 It can be more easily gripped. Examples and comparative examples

 Hereinafter, the present invention will be described in detail with reference to examples of the first invention, but the present invention is not limited to the examples.

Examples A and B and Comparative Examples C and D

 Next, the examples A and B of the present invention shown in FIGS. 2 and 4 according to the present invention and the conventional embodiments shown in FIGS. 7 and 8 are Comparative Examples C and D, respectively. The comparison between the drop strength and the strength is shown. The inner bag is made of a straight polyethylene film with an inner layer of 60 / m and a nylon 15 / m / linear polyethylene film with an outer layer of 60 jm. It is a double bag of laminated film. The capacity of the inner bag was all unified at 201.

 The test method for container self-sustainability is as follows.Inside the inner bag filled with water 201 in a container, leave it standing without an outer box, tilt the floor in the front, rear, left and right directions of the inner bag, The inclination angle of the floor where the bag fell was measured five times. 'The results are shown in Table 1.

 The test method for the drop strength of the container was to drop the inner bag filled with water 201 into a container 201 and dropped it on the floor surface, and measured the height and location of the occurrence of the bag break five times. . The results are shown in Table 2.

Corrected form (Rule 91) Table 1 Results of comparison test of independence

 • The angle of inclination of the floor where the bag falls

 -2 0 1 Fill the container with water 2 0 1 'Number of measurements n = 5

Table 2 Drop strength comparison test

 -Height at which the bag broke

 • Fill the 201 container with water 201

-Drop from bottom Measurement temperature 20 ° C Number of measurements n = 5 Sample bag-breaking height (m) Bag-breaking position Example A 1.0 to 1.5 Bottom intersection Example B 0.8 to 1.2 Same as above Comparative example C 0.5 to 0. Ί Same as above Comparative example D 0.3 to 0.5 Ditto As a result of these tests, Table 1 shows that Examples A and B according to the first invention did not impair the independence as compared with Comparative Examples C and D. Also, as shown in Table 2, both Comparative Examples C and D have a lower height than Examples A and B, and a bag break occurs at the intersection of the lower side fusion and the side film. However, the drop strength is superior to the comparative examples C and D. Industrial applicability

As described above, according to the first invention, in the inner bag of the gusset-shaped bag-in-box, the film on the side surface is continuous or close to the top fused portion on the upper side and / or the lower side. Notch to provide a reinforcing fusion-bonded part that fuses the front film and the rear film, so as not to impair the independence of the container. Upper side or lower side when inner pressure is applied to inner bag It is possible to prevent the side film near the top fused portion from being opened, to reduce the load on the top fused portion, and to improve the practical strength.

 According to the present invention, the film on the side surface is cut off at the corner or in the vicinity of the corner, and the film on the side surface is welded to each other because the fin portions are fused to each other. Prevents damage due to contact with the inner surface. Since the fused portion at the corner can be used as a gripping portion, it is suitable when the filled inner bag is taken in and out of the outer box, transported, and the contents are discharged. '

 The upper fin is not directly related to the bag's independence, but it is cut off like the lower fin to lower the center of gravity and increase the independence. It can also be used as a handle when handling bags, or left uncut. Further, the fin portion may be provided with a fused portion partially or entirely.

 According to the second invention, the unfused portion or the notched portion is provided on the upper side and / or the lower side, so that the fused portion at the corner is configured as a handle, and as a result, the filled inner bag is formed. When lifting, carrying, or pouring out the contents without an outer box, the work is very easy, and it has excellent effects such as handleability and convenience.

Claims

The scope of the claims  1. A gusset-shaped inner bag for a bag-in-box, which is a laminated body in which the film on the side to be folded is hardly heat-sealed and the resin layer is laminated as a surface layer. In addition, a reinforcing fusion bonding portion is provided in which the front film and the rear film are fused by cutting the side film continuously or close to the top fusion portion at the upper side and / or the lower side. It is characterized by the fact that "the bag of the box of the guinea box."  2. The film according to claim 1, characterized in that the front film and the rear film are fused together by cutting out the side film at the corner or near the corner. Bag box inner bag.  3. The bag box inner bag according to claim 1 or 2, wherein the inner bag has a triangular fin section separated from the storage section by a fusion section.  4. The bag according to claim 3, wherein at least one fin portion is cut and removed.  5. The bag bag box inner bag according to claim 4, wherein all of the lower fin portions are cut and removed. 6. A gusset-shaped inner bag for bag-in box formed by fusing one or more films, with the top fused at least at one corner or near the corner The front and rear films are fused with or without the side film so as to form an unfused portion between the side films between the inner bag and the side portion of the inner bag. An inner bag for a bag box, characterized in that the inner bag has a grip portion configured so that a finger can be pulled out of the inner bag from the unfused portion when a hand is further inserted. 7. The inner bag for a bag box according to claim 6, wherein the gripping portions are provided on both sides of a top fusion portion on an upper side and / or a lower side.  8. The bag-in-box inner bag has a cut-out portion from which a part or the entirety of the unfused portion is removed. Inner bag for bag-in box described  9. The bag-in-box inner bag has a triangular fin section separated by a fusion section, and the grip section is provided on the fin section. The inner bag for a bag-in box according to any one of claims 6 to 8.  10. The bag for a bag-in box according to claim 9, wherein a triangular fin portion at a lower portion of the bag-in-box inner bag is removed.  11. A side film is a laminated body in which a resin layer that is not easily heat-sealed is laminated so as to become a surface layer, and the grip portion is fused without passing through the side film. The inner bag for a bag-in box according to any one of claims 6 to 10, wherein: