JPH08217143A - Bag-in carton and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] [Purpose] Accurately mold the one-side sealed portion of the inner bag. [Structure] The one side opening of the inner bag 3 located at the one side opening of the carton 2 is sealed by a seal bar 51 to form a one side seal closed portion. Molding receiver 5 on one side of carton 2
3 and 55 and the pressing plates 54 and 56 are hermetically sealed to form one side hermetically sealed portion. Forming jig 5 from the other side opening of carton 2
7 is inserted into the inner bag 3, and the molding jig 57 presses the one-side sealed portion of the inner bag 3 against the one-side sealed portion of the carton.
The pressing force of the molding jig 57 is received by the pressing plate 58, and the one-side sealed portion of the inner bag 3 is molded in conformity with the one-side sealed portion of the carton.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-in carton in which a flexible inner bag is attached to the inner surface of a carton having a substantially rectangular parallelepiped shape, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, a bag-in-carton has been used as a liquid packaging container. Usually, the carton of a bag-in carton has a flat bottom and top surface with a flat 4 in between.
It has a substantially rectangular parallelepiped shape having side surfaces, and the inner bag is attached to the inner surfaces of the four side surfaces of the carton. This bag-in-carton is generally used for packaging low-viscosity liquids such as juice and liquor, and when the contents are taken out from the pouring outlet, the air corresponding to the discharged amount is discharged as the contents are discharged. It is handled so that it goes inside the inner bag.

[0003]

When a bag-in-carton is used for packaging high-viscosity liquid such as ink, it is necessary to suck and remove the high-viscosity liquid from the spout when removing the high-viscosity liquid. It is difficult to put it in the inner bag. For this reason, it is necessary to deform the inner bag so that the volume thereof decreases as the contents are taken out. Therefore, in the bag-in-carton of the type in which the inner bag is attached to the four sides of the carton as in the conventional case, the inner bag cannot be deformed when the contents are taken out, and as a result, it cannot be used as it is for packaging a high-viscosity liquid. .

In such a case, a bag-in-carton in which an inner bag is deformably provided inside the carton is considered. The inner bag is generally sealed by sealing the openings on both sides of the tubular film, and the sealed inner bag is housed inside the carton.

However, the shape of the seal-sealing portion of the inner bag is not fixed, and in particular, it may have a non-uniform shape inside the carton. In this case, the inner volume of the inner bag may not be kept constant.

Furthermore, when a bag-in-carton is used for packaging ink for a printing machine, the ink is automatically sucked by a mechanical device (suction device) such as a pump. Matters need to be considered.

Since the printing ink is required to have various functions such as printability and storability, its composition is generally extremely complex in a multi-component system.

The inner bag is required to have a barrier property against any of these components, so that a material having a multilayer structure is often selected.

Therefore, as a result, the material has high rigidity,
In addition, the sealing portion is made of two layers of material, which makes it hard.

When the ink is filled in the container, the ink is filled under a prescribed filling pressure while measuring a constant weight or volume with a flow meter or the like.

Therefore, under the specified ink filling pressure, unless the inner bag is in a stable storage state and the shape of the inner bag shows the capacity, as a result, "reservoir" of air other than ink is contained in the container. It will remain, the remaining amount will increase, and the variation in the remaining amount will increase.

When a bag-in-carton is mounted on a printing machine, the ink is automatically sucked by a mechanical device such as a pump. Therefore, if air is left in the container in addition to the ink, the suction amount per unit time is increased. And the printed matter becomes faint.

It is desired that the remaining amount after using the bag-in-carton is reduced.

The present invention has been made in consideration of the above points, and it is possible to appropriately pack a high-viscosity liquid such as ink and to keep the inner volume of the inner bag constant. An object of the present invention is to provide a bag-in-carton capable of making the inner bag always stored in a uniform state and stabilizing the remaining amount with a small amount, and a manufacturing method thereof.

[0015]

According to the first aspect of the present invention,
A step of adhering a flexible inner bag made of a tubular film at a predetermined position of a carton blank for carton forming, a step of raising the carton blank into a prismatic shape to assemble a carton having openings on both sides, and one side of the carton. A step of sealing one side opening of the inner bag located at the opening to form a one side seal sealing portion; a step of sealing the one side opening of the carton to form a one side sealing portion; Insert the molding jig into the inner bag through the opening on the other side of the inner bag, and press the one side seal closed part of the inner bag against the one side sealed part of the carton by this molding jig to open the one side seal closed part of the inner bag. And a step of molding in accordance with the one-side hermetically sealed portion of the carton, the back-in carton manufacturing method.

The invention according to claim 2 is a prismatic carton having one side sealing portion and the other side sealing portion on both sides, and is provided inside the carton, and corresponds to the one side sealing portion and the other side sealing portion of the carton. An inner bag having a one-side seal sealing portion and another-side seal sealing portion, wherein the one-side seal sealing portion of the inner bag is formed corresponding to the one-side sealing portion of the carton. It is a back-in carton.

[0017]

According to the present invention, the one-side sealed sealing portion of the inner bag is pressed against the one-side sealed portion of the carton by the molding jig to align the one-side sealed sealing portion of the inner bag with the one-side sealed portion of the carton. A back-in carton formed by molding can be obtained.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 8 are views showing an embodiment of a bag-in carton and a method for manufacturing the same according to the present invention.
First, the outline of the bag-in-carton will be described with reference to FIGS. 1 to 4. Of these, FIG. 1A shows a state in which the contents of the bag-in-carton are filled, and FIG. 1B shows a state in which the contents of the bag-in-carton are sucked out. FIG. 2 is a schematic perspective view of the bag in carton. 1 and 2, the bag-in carton includes a box-shaped carton 2 having a substantially rectangular parallelepiped shape that constitutes an outer container, and a flexible inner bag 3 housed inside the carton. A content 4 made of a liquid such as ink is stored. The carton 2 has an inclined surface formed between two adjacent surfaces of a rectangular parallelepiped, and the carton 2 has four flat side surfaces 2a, 2b, 2c, 2d.
And an inclined surface 2g formed between the end surface 2f and the side surface 2a.

A spout 5 communicating with the inner bag 3 is attached to the inclined surface 2g of the carton 2, and the spout 5 has a cap 6
Closed in. The spout 5 has a tubular portion 5a extending into the inner bag 3, and a groove-shaped passage 5b for passing a liquid is formed at the end of the tubular portion 5a on the inner bag 3 side. There is. By forming the passage 5b, even if the tip of the tubular portion 5a is closed by the inner bag 3, the contents 4
Can be sucked into the spout 5. The projecting height of the spout 5 from the carton 2 is determined so that the cap 6 with the cap 6 attached can enter the region surrounded by the extended surfaces of the side surface 2a and the end surface 2f. With such a configuration, a large number of back-in cartons can be arranged and stacked.

A part of the inner bag 3 is attached to the inner surface of the carton 2 and is fixed so as not to move.

That is, as shown in FIGS. 1 to 3, the inner bag 3 has a slanted surface (spout attachment surface) 2g of the inner surface of the carton 2 and a pair of side surfaces 2b adjacent to the slanted surface 2g and facing each other. 2d and the side surface 2a adjacent to the lower side of the inclined surface 2g are adhered to substantially the entire area. Inner bag 3
Of the separated surfaces that are not adjacent to the inclined surface 2g, the side surface 2c is also partially adhered. In FIG. 2, the adhesive region 9 of the inner bag 3 is shown. 3 shows a carton blank 2'for carton forming. In FIG. 3, in the adhesive area 9, the hatched portions in two directions are non-peeling areas that do not peel, and the hatched portions in one direction are peeling areas. is there.

As described above, of the inner surface of the carton 2, the inner bag 3 is adhered to the inclined surface 2g, the pair of side surfaces 2b and 2d, and substantially the entire side surface 2a below the inclined surface 2g, and is also partly attached to the side surface 2c. The inner bag 3 can be firmly fixed in the carton 2 by adhesively adhering. Also,
Adhesion between the carton 2 and the inner bag 3 is performed by a peelable adhesive. Therefore, as the content 4 decreases, the inner bag 3 can be stored and the inner bag 3 can be easily peeled from the carton 2.

The inner bag 3 is adhered to the side surface 2c in the adhesion area 9 by spotting. When the contents 4 are taken out from the spout 5, the inner bag 3 is gradually deformed and moves in the direction of the spout 5, but in this case, the inner bag 3 first comes out of the spout 5.
The inner bag 3 can be easily peeled from the side surface 2c by spotting the inner bag 3 on the side surface 2c because the side bag 2 starts to peel from the side surface 2c. The adhesive region 9 of the inner bag 3 on the side surface 2c may be square as shown in FIG.
It may also be rectangular.

Next, a method of manufacturing the bag-in-carton 1 having the above structure will be described. First, in FIG. 3, a paperboard is punched into a predetermined shape to prepare a carton blank 2'for forming a carton. The panels 2a ', 2b', 2c ', 2d', 2g 'of this carton blank 2'
An adhesive area 9 is formed on the inner surface of (side areas 2a, 2b, 2c, 2d of the carton 2 and the inclined surface 2g). As shown in FIG. 4, in parallel with the production of the carton blank 2 ′, the film is bent into a tubular shape and the end edges thereof are attached to the tube (back sealing).
6 is formed, and a tubular film 3 ′ cut into a predetermined length (upper and lower ends thereof are sealed to form an inner bag in a later step) is prepared.

Next, the panel 2 of the carton blank 2 '
An adhesive such as a vinyl acetate type, an acrylic copolymer type, a vinyl acetate / acrylic copolymer type, or a modified acrylic is applied to the adhesive region 9 formed on substantially the entire area of each of a ', 2b', 2d ', and the panel 2g'. Emulsion type adhesive such as acid ester copolymer system is applied. In addition, an adhesive is applied to the adhesive regions 9 that are partially formed on each of the panel 2c 'and the margin 2h'. In addition, the margin 2 of the carton blank 2 '
i'is a part that is folded inward when the carton is assembled, and an adhesive such as ethylene / vinyl acetate copolymer type, polyvinyl acetate type, polyamide type, polyethylene type, styrene butadiene A hot melt adhesive such as a copolymer system, a styrene / isoprene copolymer system, a polyisobutylene system, or a polyester system is applied. Further, the same adhesive as that for the glue margin 2i 'is applied to the back surface of the glue margin 2h'.

Next, as shown in FIG. 3, a tubular film 3'is attached to the panels 2a ', 2d', 2g 'of the carton blank 2'using an adhesive. in this case,
The tubular film 3 ′ is arranged so that the back seal portion 16 thereof comes into contact with the side surface 2 c when the carton blank 2 ′ is assembled and comes to a position facing the spout 5. next,
The panels 2b 'and 2c' of the carton blank 2'are folded and laminated on the tubular film 3 ', and the panel 2
The b ', 2c' and the glue allowance 2h 'are attached to the tubular film 3', and the panel 2b 'and the panel 2h' are attached. As described above, a flat bag-in-carton before assembly is formed.

Next, the flat bag-in-carton 1 is sent to the assembling and filling process, in which the bag-in-carton 1 is assembled and the contents are filled. Assembly process of bag in carton
It will be described with reference to FIG.

First, as shown in FIG. 5 (a), the bag-in carton 1 is supported by the supporting portion 27 while being raised and assembled into a prismatic shape, and openings are formed on both sides (both sides in the vertical direction) of the carton 2. At the same time, openings are formed on both sides of the inner bag 3. In FIG. 5A, the carton 2 has one side panel 24 and the other side panel 25 in the openings on both sides.
have.

Next, as shown in FIG. 5B, the carton 2
The pair of arms 28 descend from the upper opening (opening on one side). Next, the pair of arms 28 enter into the inner bag 3 to push and expand the inner bag 3, and then the other side panel 25 is expanded by an arm (not shown) (FIG. 5C).

Next, as shown in FIG. 5D, the carton 2
The female mold 29 descends from one side opening and enters the inner bag 3,
Next, the male die 30 approaches the female die 29, and between the female die 29 and the male die 30, the spout attachment portion 15 of the carton 2 (see FIG.
(See) is punched out.

Thereafter, as shown in FIG. 6A, it is confirmed whether or not the spout attachment portion 15 has been punched by the photoelectric tube 31 with respect to the punched spout attachment portion 15. Next, as shown in FIG. 6 (b), the spout holding part 32 holding the spout 5 descends from one side opening of the carton 2 and enters the inner bag 3, and the spout holding part 32 further pours. Exit mounting part 15
Move to the side and attach the spout 5 to the carton 2.

After that, as shown in FIG. 6C, it is confirmed whether or not the spout 5 is attached by the photoelectric tube 33. Next, as shown in FIG. 6D, the ultrasonic oscillator 34 approaches the spout 5 side, and at the same time, the ultrasonic wave geophone 35 descends from one side opening of the carton 2 and enters the inner bag 3. In this state, ultrasonic waves are output from the ultrasonic oscillator 34, and the spout 5 is ultrasonically sealed and fixed to the carton 2.

After that, as shown in FIG. 7A, the pair of arms 41 descend from the one side opening of the carton 2 and the inner bag 3
Enter the inside and push the inner bag 3 out. At the same time, the carton claw portion 42 approaches the carton 2 and pushes and expands the one side panel 24 of the carton 2.

Next, as shown in FIG. 7B, the pair of sealing arms 44 descend from one side opening of the carton 2 and enter the inner bag 3 to push and expand the one side opening of the inner bag 3. . At the same time, the pair of holding bars 46 and the pair of sealing bars 47 shown in FIG. 7E approach the one side opening of the inner bag 3 and the one side opening of the inner bag 3 expanded by the pair of sealing arms 44. First, the pair of presser bars 46 are pressed. Next, the pair of seal bars 47 seal the one side opening of the inner bag 3, and the first seal portion 10 is formed in the one side opening of the inner bag 3. 7 (e) is a view of the inner bag 10 shown in FIG. 7 (b) as seen from the direction of arrow E.

Next, as shown in FIG. 7 (c), the first seal portion 10 formed in the one side opening of the inner bag 3 is cooled by a cooling bar (not shown), and then, as shown in FIG. 7 (d). As shown in FIG. 3, a pair of side plates 48 are provided on the upper surface of the first seal portion 10 of the inner bag 3.
A holding plate 48 having a is arranged.

Next, the pair of pressing plates 49, 49 are pressed against the pair of side plates 48a to press the pair of triangular flaps 11 formed on one side of the inner bag 3. In this way, the air in the pair of triangular flaps 11 is exhausted.

Next, as shown in FIG. 8A, the seal bars 51 approach the pair of triangular flappers 11, and the seal bars 51 cause the base end portions of the pair of triangular flappers 11 to go straight to the first seal portion 10. The second seal portion 12 is formed.

Next, as shown in FIG. 8 (b), the pair of triangular flappers 10 and the one side panel 24 of the inner bag 3 are sequentially folded, and the pressing plate 54 disposed above the carton 2,
The one-side panel 24 is adhered and molded between the lower side opening (the other side opening) of the carton 2 and the molding receptacle 53 that has entered the inner bag 3.

Next, as shown in FIG. 8 (c), all the one side panels 24 are folded, and the pressing plate 56 arranged above the carton 2 and the other side opening of the carton 2 into the inner bag 3. Adhesion and molding of one side of the carton 2 is performed with the entering molding receiver 55, and thus one side of the carton 2 is sealed.

Next, as shown in FIG. 8D, the carton 2
A pressing plate 58 is disposed above the one side that is closed, and the forming jig 57 sequentially enters the inner bag 3 through the other side opening of the carton 2 and the other side opening of the inner bag 3. In this state, the molding jig 57 presses the one-side sealed portion of the inner bag 3 sealed by the first and second sealing portions 10 and 12 against the one-side sealed portion of the carton 2. At this time, the pressing force of the molding jig 57 is received by the pressing plate 58.

In this way, by pressing the one-side sealed sealing portion of the inner bag 3 against the one-side sealed portion of the carton 2 by the molding jig 57, the one-side sealed sealing portion of the inner bag 3 is pushed to the one side of the carton 2. It is possible to form a regular and stable shape that is regular according to the shape of the closed portion (which is shaped like a box).

In general, if the flexible inner bag 3 is sealed on one side and the inner bag 3 is sealed in the carton 2, the inner bag 3 is sealed in the carton. Various shapes are taken within the inner bag 2, which causes variations in the inner volume of the inner bag 3.

Further, if the inner bag is not regularly stored in a stable shape, the remaining amount of the contents after use increases and the remaining amount varies greatly.

In the present invention, the one-side seal-sealing portion of the inner bag 3 is molded by using the molding jig 57 in accordance with the shape of the one-side seal portion of the carton 2. Therefore, the one-side seal-sealing portion of the inner bag 3 is sealed. The part can be molded with high precision, which allows the inner bag 3
The inner volume of the can be kept constant. At the same time, as a result of storing the inner bag regularly and in a stable shape, the remaining amount after use can be reduced. Therefore, a certain amount of contents can be accurately stored in the inner bag 3. Further, since the spout 5 is attached to the inclined surface g of the carton 2 (see FIG. 2), the portion of the inner bag 3 on one side that seals against the inclined surface 2g of the carton 2 is inclined. Two
It can be molded with a regular and stable shape in accordance with the shape of g.

Thereafter, the other side opening of the inner bag 3 is similarly sealed and hermetically sealed, and then the other side of the carton 2 is hermetically sealed, and thus the bag-in-carton 1 having the inner bag accommodated in the carton 2 is obtained. Assembled.

Since these steps can be carried out by applying the conventional bag-in-carton manufacturing technique, description of manufacturing equipment and the like will be omitted. Finally, the contents 4 such as ink are filled, and the state shown in FIG.

Bag in carton 1 filled with contents 4
When using, as shown in FIGS. 1 (a) and 1 (b),
The bag-in carton 1 is set on a machine used such as a printing machine with the spout 5 facing downward, and the spout 5 has a suction device connector (not shown) provided on the machine side.
Is connected, and the content 4 is sucked out from the spout 5 and taken out.
At this time, the inner bag 3 is provided with a dotted adhesive region 9 on the side surface 2c.
From the side surface 2b, 2d. As the contents 4 are sucked out, the peeled portion of the inner bag 2 is deformed as shown by the chain double-dashed lines 21a and 21b in FIG. The contents 4 which are not put in are taken out. Then, finally, the peeled portion of the inner bag 3 is put into the remaining half of the non-peeled portion fixed to the inner surface of the carton 2, and almost all the contents are taken out.

Next, the adhesive strength between the peeled portion and the non-peeled portion of the inner bag 3 will be described.

The adhesive strength between the peeled portion and the non-peeled portion is approximately as follows.

The adhesive strength (force (gf) required for peeling when a tensile test was performed on a test piece cut into a width of 15 mm at room temperature) was about 470 gf for the non-peeled portion and about 210 gf for the peeled portion.

As described above, according to this embodiment,
Since the one-side seal-sealed portion of the inner bag 3 is molded by using the molding jig 57 in conformity with the shape of the one-side sealed portion of the carton 2, the one-side seal-sealed portion of the inner bag 3 can be accurately molded. As a result, the inner volume of the inner bag 3 can be kept constant. In addition, since the second seal portion 12 orthogonal to the first seal portion 10 is provided at the base end portion of the triangular flap 11 of the inner bag 3,
The contents are not confined in the triangular flap 11 and the remaining amount of the contents does not increase. Further, the second seal portion 12 has a reinforcing effect, so that the inner bag 3 can be maintained in a substantially rectangular parallelepiped shape, and the entire inner bag can be deformed neatly when sucking out the contents.

In each of the above embodiments, as the spout 5,
Although the one provided with the tubular portion 5a extending into the inner bag 3 is shown,
The spout 5 is not limited to this structure, and a normal spout 5 without a tubular portion may be used. In addition, an appropriate passage member (for example, a rod-shaped member having an H-shaped cross section) is formed at the bottom of the inner bag 3 so as to surely form a passage through which the contents flow even when the movable portion of the inner bag 3 is fitted. You may insert it.

The case where the bag-in carton 1 is set in the machine so that the spout 5 is on the lower side when the contents are taken out has been described, but the contents are taken out from the bag-in carton 1 in this state. Not limited to the case, it is possible to appropriately change the pouring outlet 5 to the upper side or the side depending on the machine that sets the bag-in carton 1. When the bag-in carton 1 is set on the machine so that the spout 5 is on the upper side, the liquid dripping of the contents from the spout 5 can be prevented.

Further, the housed state of the interior can always be made into a stable shape, and the remaining amount after use can be reduced.

[0056]

According to the present invention, a molding jig can be used to mold the one-side sealed portion of the inner bag in conformity with the one-side sealed portion of the carton. Therefore, the inner volume of the inner bag can be kept substantially constant and accurately.

Further, the storage condition of the inner bag can be always made stable, the entire inner bag can be deformed neatly when sucking out the contents, and the remaining amount after use can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a bag in carton.

FIG. 2 is a schematic perspective view of a bag in carton.

FIG. 3 is a schematic plan view showing a carton blank and a tube-attached film for manufacturing a bag-in-carton.

FIG. 4 is a schematic plan view showing a tubular film attached to a carton blank.

FIG. 5 is a diagram showing a manufacturing process of a bag in carton.

FIG. 6 is a diagram showing a manufacturing process of a bag in carton.

FIG. 7 is a diagram showing a manufacturing process of a bag-in-carton.

FIG. 8 is a diagram showing a manufacturing process of a bag in carton.

[Explanation of symbols]

 1 bag in carton 2 carton 2a, 2b, 2c, 2d side surface 2e, 2f end surface 2g inclined surface 3 inner bag 4 contents 5 spout 9 adhesive area 16 back seal 57 molding jig 58 pressing plate

Claims (2)

[Claims] 1. A step of adhering a flexible inner bag made of a tubular film to a predetermined position of a carton blank for carton forming, and a step of assembling a carton having a prismatic shape of the carton blank and having openings on both sides. , A step of sealing one side opening of the inner bag located at the one side opening of the carton to form a one side seal closed portion, a step of sealing the one side opening of the carton to form the one side sealed portion, and a carton Insert the molding jig into the inner bag from the other side opening and the other side opening of the inner bag, and press the one side seal sealing part of the inner bag against the one side sealing part of the carton by this molding jig. And a step of molding the side seal airtight portion so as to fit the one side airtight portion of the carton. 2. A prismatic carton having one side sealing portion and another side sealing portion on both sides, and one side seal sealing portion provided inside the carton and corresponding to the one side sealing portion and the other side sealing portion of the carton. And an inner bag having a seal sealing portion on the other side, wherein the seal sealing portion on one side of the inner bag is formed corresponding to the seal portion on one side of the carton.