JPH08175533A - Simultaneously unsealable composite container - Google Patents

Abstract

PURPOSE: To obtain a composite container having a reliable unsealability of a lap-bonded inner bag, preventing occurrence of a failure even when the inner bag is to be composited with an outer container, and ensuring that the outer container and the inner bag can be simultaneously torn. CONSTITUTION: In a composite container, an inner bag 2 and an outer container 1 can be simultaneously unseal by bonding an upper film of a lap-bonded part 4 of the inner bag 2 formed by lap-bonding to an inner surface of an unsealable cover 3 formed by sectioning the outer container 1 by a breaking line. Therefore, a large number of small slits 6 for starting unsealing are provided at the end edge of the upper film of the lap-bonded part. The lap-bonded part is bonded by a seal gradually increasing in bonding strength in a peeling direction from the end edge of the upper film.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite container including an inner bag composed of a bag-shaped container and an outer container such as a paper box.
More specifically, the present invention relates to a container capable of simultaneously opening an outer bag and an inner bag when opening the composite container.

[0002]

2. Description of the Related Art Conventionally, as a packaging container for confectionery or the like, a composite container comprising an inner bag containing the contents and a printed paper box (outer container) has been used. In this composite container, the inner bag is provided with functions such as moisture resistance and oxygen barrier property, and the paper box is provided with a design property and a protection function from impact and the like.

An example of this composite container is, for example, Jitsuko Sho 59.
As shown in Japanese Patent Publication No. -11869, Japanese Utility Model Publication No. 58-49958, etc., a plurality of cuts are provided in a seal edge of an inner bag, and the inner bag and the outer container are partially adhered to each other to form an outer container. It is known that the inner bag is designed to be opened at the same time when the provided opening lid is opened.

The inner bag of the composite container described in the above publication is
In order to facilitate simultaneous opening, a so-called envelope is attached to form a bag. In other words, the upper film of the envelope-attached portion is peeled off and cut from the planned portion. These inner bags are usually provided with a polyolefin resin such as polyethylene as a sealant, and by heat-sealing the sealant or by applying a heat-sealing agent to the portion and heat-sealing the same, an envelope sticking portion However, since the envelope sticking part of the inner bag of the above publication is completely heat-sealed up to the edge, the envelope sticking part does not peel off due to the strong heat sealing, and the paper box is more delaminated. (So-called paper peeling) sometimes happened and the desired simultaneous opening was not done. On the contrary, if the heat-sealing of the envelope sticking portion is weakened in order to ensure the peeling of the envelope sticking portion, the sealing property of the inner bag may be insufficient.

In order to solve such a problem, Japanese Patent Publication No. 6
In Japanese Patent Laid-Open No. 2-58976, an unsealed portion is provided at the edge of the envelope-attached portion of the inner bag, and the unsealed portion is adhered to an opening lid of an outer container to reliably peel off the envelope-attached portion. There has been proposed a composite container configured so as to allow it.

[0006]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
If it is configured as in Japanese Patent Publication No. 8976, the peelability of the envelope sticking portion is certainly improved as compared with the conventional configuration. But,
In the case where such an unsealed portion is provided, if the film is excessively strongly sealed when the sealed portion is formed, the film will be cut at the boundary between the unsealed portion and the sealed portion (edge of the sealed portion) during opening, So-called edge cuts sometimes occurred.
When this edge breakage occurs, opening the inner bag becomes extremely difficult. In addition, since many cuts necessary for opening are provided on the edge of the envelope sticking part, when an unsealed part is provided,
A notch will be provided in the unsealed portion, and the portion surrounded by the notch will become a small piece, which will float up,
Alternatively, it may be easily bent, and there is a risk that the inner bag and the outer container may not be bonded as planned. If the bonding is not done as planned, it is no longer possible to open the inner bag at the same time.

Therefore, the present invention provides a composite container that ensures the peelability of the envelope-attached inner bag, and does not cause any inconvenience when it is combined with the outer container, and can surely perform simultaneous opening. To do.

[0008]

[Means for Solving the Problems] That is, the present invention is an unsealing in which an upper film of an envelope sticking portion of an inner bag formed by sticking envelopes is formed in the outer container by break lines to form an unsealed bag which is composed of an inner bag and an outer container. By adhering to the inner surface side of the opening start side of the lid, in a composite container capable of simultaneously opening the inner bag and the outer container, in the edge of the upper film of the envelope sticking part, a small cut for starting tearing Is provided, and the envelope sticking portion is bonded by a seal whose adhesive strength gradually increases from the edge of the upper film in the peeling direction. To do. In this simultaneous opening composite container, further on the edge of the lower film of the above-mentioned envelope pasting part,
Many small cuts can be provided to start tearing.

In the above composite container, the adhesive strength of the envelope sticking portion of the inner bag gradually increases from the edge toward the peeling direction, and the adhesive strength at the end of the peeling direction is sufficient. The sealing property of is sufficient. At the time of unsealing, the upper film of the envelope sticking portion adhered to the inner surface side of the unsealing lid of the outer container is pulled by the unsealing lid, and peeling easily starts from the edge side thereof. A large number of small cuts for starting tearing are provided at the edge of the upper film of the envelope sticking portion, and the upper film is torn from the small cuts that abut on both side edges of the opening lid by the pulling. Since the adhesive strength of the seal of the envelope sticking portion is gradually increased and the strength is not sharply increased, the peeling of the upper film is completed smoothly. After this, the both side edges of the opening lid serve as guides, the inner bag is torn, an opening having a shape substantially the same as the shape of the opening lid is formed, and the opening is completed. If a small cut is provided at the edge of the lower film, the lower film covering the opening of the opened container can be easily torn and removed.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. 1 is a sectional view for explaining an embodiment of the present invention, FIG. 2 is an enlarged sectional view of an essential part of the embodiment, FIG. 3 is an external perspective view showing a state before unsealing of the embodiment, and FIG. FIG. 5 and FIG. 6 are explanatory views of the assembling method of the same embodiment, FIG. 7 is an explanatory view showing an example of a small cut, and FIG. 8 is a coating pattern of the heat sealing agent. It is a top view which shows an example.

As shown in FIG. 1, the composite container of the present invention comprises an outer container 1 made of a paper box and an inner bag 2 made of a laminated material mainly containing a plastic film.

The outer container 1 is a paper box (carton) made of coated cardboard or the like having a basis weight of about 300 g / m ² , and its shape is not particularly limited, but is usually a rectangular parallelepiped, and is shown in FIGS. 3 to 4. The opening lid 3 as described above is formed by being divided into the break lines 31 typified by perforations.

The inner bag 2 is formed into a tubular shape by sealing by laminating a long laminated material at both end edges in the width direction as shown in FIG. This tubular body has 2
One of the two openings is sealed, the content 9 is filled from the other opening, and then the opening is sealed. In addition, as shown in FIG. 4, a large number of small cuts 6 are provided on the edge of the upper film 41 of the envelope sticking portion 4 to facilitate tearing of the film, as shown in FIG. There is.

As for the small cuts 6, only those which come into contact with the positions of both side edges of the opening lid 3 are actually used.
If the inner bag 2 and the outer container 1 are provided only at these two positions, it is necessary to strictly align them. However, if a large number of small cuts 6 are provided as in the illustrated embodiment, it is not necessary to perform such alignment, which is rational.

A so-called I-notch as shown in the drawing is simple and can be preferably adopted as the small cut 6, but the present invention is not limited to this, and a scratch formed on the edge line as shown in Japanese Patent Publication No. 61-39228 can be used. , A method of half-cutting instead of the I notch, or a scar as shown in JP-A-61-142159, JP-B-54-22484.
A hole or a notch as shown in Japanese Patent Publication, or a notch such as a well-known V notch may be adopted. In any case, the small cut 6 may function as the "trigger of tearing" described above. This small cut 6 is preferably provided in advance in the laminated material for making the inner bag 2.

The above-mentioned inner bag 2 is shown in FIGS. 4, 1 and 2.
As shown in FIG. 3, the envelope sticking portion 4 located inside the opening lid 3 of the outer container is adhered to the inner surface side of the opening lid 3 with an adhesive 7 or the like. The upper film 41 of the envelope sticking part 4 is pulled,
4, the outer container 1 and the inner bag 2 are opened at the same time, as shown in FIG. .

Further, in the present invention, the lower film 42
A small cut 61 similar to the above small cut 6 is also provided on the edge of
Can be provided. According to this structure, when the container is opened, the portion of the lower film 42 that covers a part of the opening can be torn and removed, and the opening can be made larger, so that the contents 9 can be easily taken out. be able to.

At positions other than the above-mentioned bonding position,
In order to integrate the outer container 1 and the inner bag 2 to facilitate the handling, or in order to make the opening more reliable, it is necessary to partially bond them with the same adhesive 7 as described above. Is preferred (see FIGS. 1 and 5).

The envelope sticking portion 4 of the inner bag 2 is adhered by a seal whose adhesive strength gradually increases from the edge of the upper film 41 in the peeling direction. For the purpose of the present invention, in the envelope sticking part 4, the upper film 41 is
At least a part of the tip (edge) of the lower film 42
It is preferably sealed to. The illustrated embodiment
As shown in FIG. 2, a heat-sealing agent layer 5 is formed, and this is heat-sealed and bonded to form an envelope sticking portion 4. The adhesive strength is set as described above by gradually increasing it in the peeling direction when opening. The heat sealing agent layer 5 may be provided in advance on the inner surface side of the upper film 41, or may be provided on the outer surface side of the lower film 42.

In order to adjust the coating amount of the heat seal agent as described above, the plate depth (cell depth) of the plate on which the heat seal agent is coated is gradually changed, or the coating area ratio of the plate is gradually changed. Either of them or a method of using them in combination is possible. As a specific example, the plate depth of the plate for applying the heat seal agent is set to 25 μm on the edge side of the upper film 41, gradually increasing in the peeling direction, and finally 5
The heat-sealing agent layer 5 may be applied and formed in a gradient form so that the plate depth is 0 μm. The peeling strength (180 ° peeling) of the envelope sticking portion 4 thus configured is about 220 g / 15 mm width on the peeling start side of the upper film 41 and about 550 g / 15 mm width on the peeling end side.

In the present invention, the term "gradually" includes not only the above-mentioned "gradation state" but also the one in which the coating amount or / and the coating area ratio changes stepwise. The heat sealing agent layer 5 having a coating pattern as shown in a) to (g) can be exemplified. By using such a seal composed of the heat-sealant layer 5, there is no problem that the upper film is easily peeled off and the film is torn (edge breakage) at the time of unsealing, and it is opened to the end. In addition, when it is necessary to completely seal the inner bag, in addition to the heat seal agent application pattern shown in FIGS. Sealing assurance part 51 consisting of the heat sealant application part
Is preferably provided at the end portion in the peeling direction (see FIG. 8).
(See (g)).

Next, an example of how to assemble the above embodiment will be described with reference to FIGS. First, gradually increase the coating amount on the outer surface side of one side edge (the side that becomes the lower film) in the width direction of a long laminated material mainly composed of plastic film from the side overlapped with the edge side of the upper film. (The plate depth is 25 to 50 μm), and the heat seal agent layer 5 having a total width of 18 mm is formed. A linear cut 6a having a length of 0.5 mm perpendicular to the edge line as shown in FIG. 3 with an interval of 6 mm of 0.5 mm
The small incisions 6 formed in a straight line
A large number are provided at intervals of mm, the side where the heat sealing agent layer 5 is provided is the lower film 42, and the side where the small cut 6 is provided is the upper film 41. Get bag 2.

On the other hand, an acryl acetic acid is placed at a predetermined position on the inner surface side of the outer container blank 15 which is provided with the opening lid 3 which can form an opening from the front plate 11 to the top plate 12 and which is defined by a broken line 31 made of perforations. An adhesive 7 such as an emulsion adhesive or a hot melt adhesive using a vinyl copolymer resin is applied and formed. Then, the inner bag 2 folded as shown is arranged so as to be covered with the outer container 1, and the inner bag 2 is adhered to the inner surface of the outer container 1 by the adhesive 7, and the two are integrated and folded. It is a tubular body. At this time,
The envelope sticking part 4 located inside the opening lid 3 of the outer container 1 is
It is necessary to adhere to the inner surface side of the opening lid 3 (see FIGS. 1 and 2).

Since the inner bag 2 is adhered to the outer container blanks 15 at the appropriate places as described above, the openings 21 at both ends of the inner bag 2 are integrated with the outer container 1 and the inner bag 2. When assembled into a rectangular tube, the inner bag 2 opens in a rectangular tube along the shape of the outer container 1 (see FIG. 6). Then, as described above, one side of the openings 21 on both sides is sealed by heat sealing or the like, and then the content 9 is filled, and then the remaining openings 21 are similarly sealed to seal the inner bag 2, and then The flaps 17 and 18 of the outer container 1 are folded and glued and sealed to complete the simultaneous opening composite container of the present invention shown in FIG.

Any laminating material may be used as the laminating material for the inner bag 2. Generally, a base film made of polyethylene terephthalate film, nylon film or the like and a sealant made of a polyolefin film such as polyethylene are used. Those laminated by a known method such as dry laminating or extrusion coating, and further sand laminating using a heat adhesive resin as an adhesive layer can be used, and if necessary, a metal foil, a metal vapor deposition layer, an inorganic compound such as silicon oxide. The vapor-deposited layer or the like can be laminated as a moisture-proof layer, a gas barrier layer, or a light-shielding layer according to the purpose. It should be noted that it is desirable to use a tearable film such as a uniaxially stretched film for this laminated material in order to improve the tearability when it is used as an inner bag. In this case, it is obvious that the tear direction of the tear film and the tear direction of the inner bag are made to coincide with each other.

As an example of a specific laminated material, a laminated material having an outer surface [biaxially oriented polypropylene (20 μm) / printing layer / sand polyethylene (15 μm) / aluminum foil (7 μm) / extruded polyethylene (30 μm)], an outer surface [Transverse uniaxially stretched polypropylene (25 μm) /
Printed layer / Sand polyethylene (15 μm) / Aluminum foil (7 μm) / Extruded polyethylene (30 μm)]
Laminated material of constitution, outer surface [transverse uniaxially stretched polypropylene (25 μm) /
Printing layer // aluminum foil (7 μm) // polyethylene (30 μm)] laminated material or outer surface [polyethylene terephthalate (12 μm) / printing layer / aluminum foil (7 μm) // polyethylene (15 μm)] laminated material Can be illustrated. Of course, not only this structure but various structures can be adopted.
Further, even in the above configuration, when a printing layer or the like is not necessary, the layer can be omitted. Further, the heat sealing agent layer 5 used in the illustrated embodiment can be formed on the outer surface side or the inner surface side of this laminated material by any means.

In the above laminated material, the symbol // indicates that the interface is laminated by dry lamination. In addition, sand polyethylene indicates an adhesive resin layer when laminated by sand lamination using polyethylene resin as an adhesive resin, and extruded polyethylene indicates that polyethylene resin is laminated by extrusion lamination.

Although the present invention has been described in detail with reference to the illustrated embodiment, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in the above embodiment, the sealing of the envelope sticking portion 4 is realized by changing the coating amount or / and the coating area ratio of the heat sealing agent layer, but by adjusting the heat amount and / or pressure during heat sealing, The adhesive strength may be realized.

[0029]

According to the present invention described above, since the inner bag is sealed by sticking an envelope, external pressure is applied to the portion even though the adhesive strength is weak enough to allow peeling. The pressure resistance of the bag is excellent. Then, since the envelope sticking portion is bonded by a seal whose adhesive strength gradually increases from the edge of the upper film in the peeling direction, when the opening lid of the outer container is operated, the upper film easily peels from the edge, Moreover, since the adhesive strength gradually increases and there is no sudden change in the adhesive strength on the way, the outer container can be peeled and opened securely until the end without peeling the paper in the outer container or tearing the film in the inner bag. . In addition, since the unsealed portion is not provided in the envelope pasting portion of the present invention, there is no problem such as bending of the portion and defective sealing, and the yield is good.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the same embodiment.

FIG. 3 is an external perspective view showing a state before opening of the same embodiment.

FIG. 4 is an external perspective view showing a state after opening the same embodiment.

FIG. 5 is an explanatory view of an assembling method of the embodiment.

FIG. 6 is an explanatory view of an assembling method of the embodiment.

FIG. 7 is an explanatory diagram showing an example of a small cut.

FIG. 8 is a plan view showing an example of a heat seal agent application pattern.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Outer container 2 ... Inner bag 3 ... Opening lid 4 ... Envelope pasting part 5 ... Heat sealing agent layer 6 ... Small cut 7 ... Adhesive 9 ... Contents

Claims (7)

[Claims] 1. An inner bag and an outer container, wherein an upper film of an envelope sticking portion of an inner bag formed by sticking an envelope is adhered to an inner surface side of an opening lid defined by a break line in the outer container. In the composite container capable of simultaneously opening the inner bag and the outer container, a plurality of small cuts for starting tearing are provided at the edge of the upper film of the envelope sticking part, and the envelope sticking part is The simultaneous opening composite container, characterized in that it is adhered by a seal whose adhesive strength gradually increases from the edge of the upper film in the peeling direction. 2. An envelope sticking portion is sealed by a heat seal agent applied to the envelope sticking portion, and the adhesive strength is gradually increased by gradually changing the application amount of the heat seal agent. The simultaneous opening composite container according to claim 1, characterized in that. 3. The coating amount of the heat sealing agent is gradually changed by gradually changing the plate depth of the plate to which the heat sealing agent is applied.
The simultaneous opening composite container described in. 4. The coating amount of the heat sealing agent is gradually changed by gradually changing the coating area ratio of the plate on which the heat sealing agent is coated. Simultaneously open compound container. 5. The envelope sticking portion is sealed by heat-sealing the heat-sealable resin layer on the inner surface of the inner bag, and by gradually changing the amount of heat during this heat-sealing,
The simultaneous opening composite container according to claim 1, wherein the adhesive strength is gradually increased. 6. The envelope sticking portion is sealed by heat-sealing the heat-sealing resin layer on the inner surface of the inner bag, and the pressure at the time of heat-sealing is gradually changed,
The simultaneous opening composite container according to claim 1, wherein the adhesive strength is gradually increased. 7. A simultaneous cut according to claim 1, wherein a plurality of small cuts for starting tearing are provided on an edge of the lower film of the envelope sticking portion. Opened composite container.