JP4139463B2 - Easy-open bag in carton - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bag in carton in which an outer box and an inner bag can be easily separated and opened at the same time and re-sealed like a crate box.
[0002]
[Prior art]
A vertically long, rectangular parallelepiped bag-in-carton, which is manufactured by sticking an inner bag in the carton blank stage of the outer box, has been established in the market and is used for instant coffee, skim milk, snacks, and the like. This bag in carton is represented by what is called a flip top type.
FIG. 6 is an explanatory diagram of a conventional flip top bag-in carton 40. As shown in FIG. 6, the opening and resealing is performed by first opening the lid formed by cutting the upper side of the outer box while turning one side of the top plate as a hinge, and then appearing inside A method is adopted in which the bag is pulled out, a part thereof is cut out with scissors or the like, the contents are taken out, the inner bag is folded, and the lid is returned to the original position.
Also, in the same shape bag in carton such as regular coffee, the outer box is cut up and down by the zipper provided in the middle part of the outer box body, the upper part of the outer box is removed, the contents are taken out from the inner bag and then separated Some types use the top of the outer box as a cover.
On the other hand, cup-shaped containers with a sealing lid made of a laminated material mainly composed of paperboard having a barrier layer are mainly used for snacks.
FIG. 7 is an explanatory view of a conventional cup-shaped container 50 with a lid. This type of package is used in various life situations because it is easy to carry after opening and take out the contents.
[0003]
[Problems to be solved by the invention]
However, the conventional flip top bag in carton 40 as described above has a problem that it takes too much time to open and reseal. Moreover, although the upper part of the outer box once removed functions as a lid on the shape, there is a problem in resealability without being surely fitted.
Further, unless the inner bag is cut horizontally, the upper part of the inner bag remains until the end, and there is a problem that it becomes an obstacle when taking out the contents.
In addition, the conventional cup-shaped container 50 has a convenience that can be carried with one hand after the top has a large opening, but once the lid is peeled off, it cannot be resealed, and aluminum foil is used as a barrier layer. When it is used, there is a problem that pinholes frequently occur around the bottom when molding the bottom of the cup, and in particular, the oxygen barrier function is lost.
The present invention has been made in view of the above-described problems, and can easily separate the outer case and the inner bag at the same time with a predetermined width on the upper part of the vertically long inverted truncated pyramid shaped bag in carton. An object of the present invention is to provide an easily openable bag in carton in which the contents can be easily taken out and the separated upper portion of the outer box can be reused as a cover with good resealability.
[0004]
[Means for Solving the Problems]
An easy-open bag in carton made to solve the above problems is formed by back-sealing a laminated film having a sealant layer at least on the innermost surface at a predetermined position on the back surface of a carton blank of a cardboard outer box. A bag in carton in which an inner bag is attached and boxed, wherein the outer box has an inverted truncated pyramid shape with a larger diameter toward the upper part, and the outer box and the inner bag are upper parts of the outer box. The outer box and the inner bag are simultaneously cut up and down simultaneously by tearing a belt-like zipper of a predetermined width that goes around the horizontal provided on the upper part, and the upper part of the outer box becomes a cover lid and the lower part of the outer box It becomes a structure which becomes a body lid box which seals an open end part. Further, the back seal portion of the inner bag is formed as a band-like seal with the inner surfaces of opposite side ends of the laminated film facing each other, leaving a short surplus piece and a long surplus piece at the both side ends, The outer surface of the end piece is bonded to the inner surface of the zipper of the outer carton. As the laminated film of the inner bag, a uniaxially stretched film is used, and the stretching direction of the uniaxially stretched film and the tearing direction of the zipper substantially coincide with each other. It is good also as a structure that the scar is provided in the edge.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it will be described in detail with reference to the drawings.
FIG. 1 is a developed view of the back side of a carton blank of an easily openable bag in carton according to the present invention.
In the carton blank 10 of the easy-open bag-in-carton according to the present invention, four side wall panels having a predetermined taper that spreads upward are connected in the lateral direction. That is, the inverted trapezoidal side plate 1, front plate 2, side plate 3, rear plate 4, and glue margin 5 are connected in this order via the fold lines a to d, and the top side thereof is connected to the top via the fold line e. The plate 8 and the flap F are connected to each other, and the top plate 9 and the flap F are connected to each other through a folding line f. A zipper 6 having two rows of cuts g is formed substantially horizontally on the side wall panels 1 to 4 and the adhesive margin 5. Moreover, the front-end | tip of the zipper 6 on the side plate 1 serves as the knob piece 7, from which the zipper 6 is torn.
Although the shape of the notch g is Y-shaped, it may be L-shaped.
[0006]
FIG. 2 is an explanatory view of the inner bag of the easy-open bag in carton according to the present invention.
2A is a plan view of the flat inner bag 20 attached to the back surface of the carton blank 10, and FIG. 2B is an enlarged perspective view of the back seal portion S. FIG.
As shown in FIG. 2 (a), the inner bag 20 is flattened and sealed so that both ends of a wound laminated film having a sealant layer as an innermost layer constitute a back seal portion S. Folded and cut to a predetermined length.
In the back seal portion S, as shown in FIG. 2 (b), opposite side ends of the laminated film are sealed with a strip-shaped joint seal portion 11 with the remaining pieces 12 and 13 of two short and long pieces remaining. Thus, the short surplus piece 12 is folded over so as to be on the long surplus piece 13.
A part of the short take-out port 12 serves as an adhesive portion 14 with the zipper.
A scar 15 is formed on the edge of the short surplus piece 12 so that it can be easily cut from any position on the end edge of the surplus piece 12.
In addition, a uniaxially stretched film is used in the laminated film so that the tear that has once occurred is easily propagated in one direction, and the stretched direction is indicated by a dotted seal in FIG. 2 (b). It is orthogonal to the part 11.
[0007]
The flat inner bag 20 described above is first attached to the back surface of the carton blank 10 with high accuracy at the position indicated by the alternate long and short dash line in FIG. In this case, in FIG. 1, the adhesive is partially coated at the position indicated by the oblique lines, and the inner bag 20 is first firmly bonded to the back surface of the front plate 2 of the carton blank 10.
Next, the carton blank is folded in three at the folding lines a and c, the glue margin 5 and the ends of the side plate 1 are glued together, and the carton blank 10 is sack pasted. At this time, the back surface of the rear plate 4 and the inner bag 20 Are simultaneously bonded. Further, at this time, it is important that a part of the short surplus piece 12 becomes a bonding portion 14 with the zipper and a portion 14 ′ of the zipper 6 facing it is firmly bonded. At the same time, it is preferable that the long surplus piece 13 at the zipper 6 level is bonded to the adhesive margin facing the zipper 6 because it is easy to start the simultaneous tearing of the outer box and the inner bag 20 by the zipper 6. The positions of both are indicated by halftone dots in FIG.
In this way, the folded carton with the inner bag 20 attached thereto is supplied to the user, supplied one by one to the molding and filling machine, and when the carton is raised, the inner bag spreads into the carton in a cylindrical shape. Therefore, first, the bottom end portion of the inner bag is heat-sealed and folded, and then the bottom plate 9 and the bottom flap F are folded to form the bottom portion. Then, the contents are filled from the open top, and the inner bag top portion is heat-sealed. When the top plate 8 and the top flap F are folded back and bonded together to form the top portion, an easy-open bag in carton 30 according to the present invention as shown in FIG. 3A is obtained.
[0008]
FIG. 3 is an explanatory view of opening / resealing the easy-open bag in carton according to the present invention.
The easy-open bag in carton 30 according to the present invention has an inverted truncated pyramid shape having a taper as shown in FIG. 3A, and a belt-like zipper 6 is horizontally provided on the top thereof.
When the knob 7 at the tip of the zipper 6 is picked with a finger and pulled as shown in FIG. 3B, the inner part of the zipper 6 of the inner bag 20 is also simultaneously torn with the width of the zipper 6, and is torn by the zipper 6. 1 rounds, the easy-open bag in carton 30 according to the present invention is opened with the upper part (not shown) completely cut off as shown in FIG. This is almost the same as the cup-shaped container shown in FIG. 7, so the contents can be picked and eaten while driving in the drink holder of the car, and finally the contents in the mouth Can also be poured directly.
Further, when leaving a part, if the upper outer box is put on the lower part shown in FIG. 3C, the open end can be sealed just like the cover of the body box. The sealed state is shown by FIG. Of course, it can be used again from this state.
The tightness of the seal can be controlled by selecting the taper applied to the outer box and the width of the zipper 6 in consideration of the thickness of the carton blank, and between the upper cut inner diameter and the lower cut outer diameter, It is preferable to provide a difference that is slightly larger than the thickness of the blank.
The simultaneous opening of the outer box and the inner bag according to the above procedure is performed very speedily, and since it does not require force to tear the zipper 6 by means described later, it can be opened even for children, elderly people, and people with handicap. It becomes easy. In addition, the contents can be easily taken out as described above, and can be resealed easily and closely in the manner of a crate box.
[0009]
FIG. 4 is a horizontal sectional view of the zipper portion of the easy-open bag in carton according to the present invention.
FIG. 4A is a state diagram before opening, and FIG. 4B is a state diagram immediately after the back seal portion S is opened.
As shown in FIG. 4, the portion 12 ′ of the zipper 6 is firmly bonded to the short surplus piece 12 of the inner bag 20, and when the knob piece 7 is pulled up as described above, the zipper 6 is torn along with the short surplus. The tearing of the inner bag starts from the edge of the end piece 12 at the width of the zipper 6, and when it passes the palm seal part 11 of the back seal part S, the inner bag is opened and the tearing makes a full circle. The easy-open bag in carton 30 is cut up and down.
[0010]
FIG. 5 is an enlarged cross-sectional view of the back seal portion S of the easy-open bag in carton according to the present invention.
For the laminated film of the inner bag 20, for example, a laminated structure including a polyethylene layer 21, an aluminum layer 22, a polyethylene layer 21, and a uniaxially stretched polypropylene layer 23 in order from the inside is adopted.
As shown in FIG. 5A, the inner bag 20 is torn from the scar 15 provided on the edge of the short surplus piece 12 as described above, and the surplus piece 12 is torn by the width of the zipper 6. When reaching the point A where the joint seal portion 11 starts, the tear resistance usually increases rapidly, the laminated film of the joint seal 11 portion cannot be torn, and the zipper 6 is cut at this point. In the inner bag 20 of the easy-open bag in carton 30, the following means are applied in advance to weaken this resistance.
As shown in FIG. 5 (a), the first means is to separately provide a heat sealant layer or an anti-heat sealant that lowers the cohesive force between the opposing polyethylene layers 21 indicated by x and easily causes cohesive failure. It is a method of providing. These layers can be partially coated at predetermined locations by a gravure coating method.
The second means is a method in which the opposing polyethylene layers 21 are firmly heat-bonded, and instead, a peeling layer is provided inside one of the polyethylene layers 21 at the position indicated by the wavy line in FIG. It is.
In this case, as shown in FIG. 5 (b), in the joint seal portion 11, the lower polyethylene layer 21 is cut by the width of the zipper 6 at point A and point B where the joint seal ends, and the upper polyethylene layer 21. To the side. When passing through both points A and B, a discontinuous force is applied to cut the polyethylene layer. However, if the zipper width is about 6 to 13 mm, the force does not become large, and the action of the above release layer Thus, the palm seal part 11 can be passed smoothly.
[0011]
The scar 15 used in the present invention is a band or line in which a large number of scratches that cannot be easily identified with the naked eye are densely packed from one side of the film to the other side or from the edge surface of the film to the inside. It is provided in the shape. The size density of individual scars varies depending on the type, thickness, processing method, and the like of the film, and there are those that penetrate the film, those that have only shallow missing portions, and those that are locally stretched. In order to provide the scars as described above on the edge of the short surplus piece 12 of the laminated film as shown in FIG. 2 (c), as proposed in Japanese Examined Patent Publication No. 61-39228, Slit in the middle of a band-shaped scar obtained by pressing a rotating whetstone containing relatively large abrasive grains having a predetermined width in the flow direction of the laminated film, or once the winding roll has been wound up neatly You may make it rub with a wire brush, an abrasive grain adhesive sheet material, etc.
[0012]
As described above, the laminated film used for the inner bag of the present invention may be composed of polyethylene layer 21 / aluminum foil 22 / polyethylene layer 21 / lateral uniaxially stretched polypropylene layer 23 in order from the inner surface, You may use what was comprised from the inner surface in order from the polyethylene layer 21 / aluminum foil 22 / adhesion layer / horizontal uniaxially-stretched polypropylene layer 23. FIG. In addition, the inner bag 20 can be composed of a laminated film in which at least a known barrier layer, stretched film layer, and the like are appropriately laminated.
[0013]
The outer box paperboard used in the present invention is preferably a normal coated ball, but other paperboards can also be used. The basis weight can be appropriately selected from 250 to 400 g / m ² according to the size and application of the outer box.
As the adhesive between the carton blank 10 and the inner bag 20, an adhesive mainly composed of a resin made of vinyl acetate / acrylic copolymer is preferably used.
[0014]
【The invention's effect】
According to the present invention, the zipper 6 provided on the top of the vertically inverted trapezoidal bag in carton can open the outer box and the inner bag at the same time very quickly, and no force is required to tear the zipper 6. Therefore, it becomes easy to open even for children, elderly people, and people with handicap. In addition, after opening, the contents can be easily taken out in the same way as a cup-shaped container, and can be re-sealed easily and closely in the same manner as a crate box with the upper part once separated as a lid. .
In addition, once opened, it cannot be restored, so that it can also have a mischief prevention function.
[Brief description of the drawings]
FIG. 1 is a developed view of the back side of a carton blank of an easy-open bag in carton according to the present invention. FIG. 2 is an explanatory view of an inner bag of the easy-open bag in carton according to the present invention. FIG. 4 is a horizontal sectional view of the zipper portion of the easy-open bag in carton according to the present invention. FIG. 5 is an enlarged cross section of the back seal portion S of the easy-open bag in carton according to the present invention. FIG. 6 is an explanatory diagram of a conventional flip-top bag in carton. FIG. 7 is an explanatory diagram of a conventional cup-shaped container.
DESCRIPTION OF SYMBOLS 1 Side plate 2 Front plate 3 Side plate 4 Rear plate 5 Glue allowance 6 Zipper 7 Picking piece 8 Top plate 9 Bottom plate 10 Carton blank of easy-open bag in carton according to the present invention 11 Joint seal portion 12 Short surplus piece 13 Long margin Piece 14 Adhesive part 15 with zipper Scar 20 Inner bag 21 of easy-open bag in carton according to the present invention Polyethylene layer 22 Aluminum layer 23 Uniaxially stretched film layer 30 Easy-open bag in carton 40 according to the present invention Conventional flip-top bag In carton 50 Conventional cup-shaped container ab Bent line g Notch S Back seal part F Flap

Claims (4)

It is a bag-in-carton that is made by box-bonding an inner bag made of a laminated film having a sealant layer on at least the innermost surface in a predetermined position on the back side of the carton blank of the outer box made of paperboard. The outer box has an inverted truncated pyramid shape with a larger diameter toward the upper part, and the outer box and the inner bag tear a belt-like zipper having a predetermined width provided around the upper part of the outer box. Thus, the outer box and the inner bag are simultaneously cut up and down, and the separated upper part of the outer box becomes a cover and becomes a body box that seals the open end of the lower part of the outer box. Easy-to-open bag in carton.   The back seal portion of the inner bag is formed in a belt-like manner by sealing the inner surfaces of the opposite side ends of the laminated film on both sides, leaving a short surplus piece and a long surplus piece. 2. The easily openable bag-in carton according to claim 1, wherein an outer surface of the bag is bonded to the zipper inner surface of the outer carton.   The easy-openability according to claim 1 or 2, wherein the laminated film of the inner bag is laminated with a uniaxially stretched film, and the stretching direction of the uniaxially stretched film and the tearing direction of the zipper substantially coincide with each other. Bag-in carton.   The easily openable bag in carton according to any one of claims 1 to 3, wherein the inner bag is provided with a scar on an edge of the short surplus piece.

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