JP3634429B2 - Manufacturing method of bag-in carton - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a bag-in-carton manufacturing method in which a flexible inner bag is attached to the inner surface of a substantially rectangular parallelepiped carton.
[0002]
[Prior art]
Conventionally, bag-in-cartons are used as liquid packaging containers. Usually, a carton of a bag-in carton has a substantially rectangular parallelepiped shape having a flat bottom surface and a top surface and four flat side surfaces therebetween, and the inner bag is attached to the inner surface of the four side surfaces of the carton. This bag-in carton is generally used for low-viscosity liquid packaging such as juice and liquor, and when the contents are taken out from the spout, air corresponding to the discharged amount is discharged as the contents are discharged. It is handled so as to enter the inner bag.
[0003]
[Problems to be solved by the invention]
When using a bag-in carton for packaging high-viscosity liquids such as ink, it is necessary to suck out the liquid from the spout when taking out the high-viscosity liquid. At that time, it is difficult to put air into the inner bag. is there. For this reason, it is necessary to deform the inner bag so that the volume is reduced as the contents are taken out. Therefore, in the conventional bag-in carton in which the inner bag is attached to the four side surfaces of the carton, the inner bag cannot be deformed when the contents are taken out, and as a result, it cannot be used for packaging high-viscosity liquid as it is. .
[0004]
In such a case, a bag-in carton having an inner bag deformably provided inside the carton is considered. The inner bag is generally sealed by sealing both side openings of the tubular film, and the sealed inner bag is stored inside the carton.
[0005]
However, the shape of the sealed seal portion of the inner bag is not fixed, and in particular, the inner bag may have a non-uniform shape. In this case, the inner volume of the inner bag may not be kept constant.
[0006]
In addition, when using a bag-in carton for packaging ink for printing presses, the ink is automatically sucked by a mechanical device (suction device) such as a pump. There is a need to.
[0007]
(1) Since printing inks are required to have various functions such as printability and storability, their composition is generally very complex and complicated.
[0008]
Since it is necessary to secure barrier properties for any of these components, the inner bag is often selected from a multi-layer material.
[0009]
As a result, the material becomes stiff, and the seal portion becomes hard because the material is two layers.
[0010]
(2) When filling the container with ink, the ink is charged under a prescribed filling pressure while measuring a certain weight or volume with a flow meter or the like.
[0011]
Therefore, under the specified ink filling pressure, if the inner bag is not stored in a stable shape and does not have the shape of the inner bag, it will result in a “reservoir” of air other than ink remaining in the container. The remaining amount increases and the remaining amount variation also increases.
[0012]
(3) When a bag-in-carton is installed in a printing machine, ink is automatically sucked by a mechanical device such as a pump, so if air remains in the container, the suction amount per unit time This causes a problem that the printed matter is faded due to variations.
[0013]
(4) It is desired that the remaining amount after using the bag-in carton is reduced.
[0014]
The present invention has been made in consideration of the above points, and it is possible to appropriately package a high-viscosity liquid such as ink, and to keep the inner volume of the inner bag constant. It is an object of the present invention to provide a method for manufacturing a bag in carton that can be kept in a uniform state and can be stabilized with a small remaining amount.
[0015]
[Means for Solving the Problems]
The present invention includes a step of adhering a flexible inner bag made of a tubular film to a predetermined position of a carton blank for carton molding, a step of raising a carton blank into a prism shape and assembling a carton having openings on both sides, A step of linearly sealing one side opening of the inner bag located in the one side opening of the carton to form a pair of triangular flaps, and a base end of the pair of triangular flaps formed in the one side opening of the inner bag, respectively A step of sealing to form a one-side seal sealing portion, and a pair of triangular flaps of the inner bag are folded inward, then one side opening of the carton is folded and sealed to form a one-side sealing portion. And forming a sealed part on one side of the carton, and then inserting a molding jig into the inner bag from the other side opening of the carton and the other side opening of the inner bag. Push the side seal seal to one side seal of the carton With a bag-in carton manufacturing method, wherein a one side seal closure of the inner bag further comprising the step of molding in accordance with the one side closed portion of the carton.
[0016]
[Action]
According to the present invention, the one side opening of the inner bag is linearly sealed to form a pair of triangular flaps, and the base ends of the pair of triangular flaps are respectively sealed to form the one side seal sealing portion. The content does not enter into the triangular flap and the remaining content does not increase.
[0017]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0018]
1 to 8 are views showing an embodiment of a bag-in carton and a manufacturing method thereof according to the present invention. First, the outline of the bag-in carton will be described with reference to FIGS. Among these, Fig.1 (a) has shown the state which filled the content of the bag in carton, FIG.1 (b) has shown the state which sucked out the content of the bag in carton. FIG. 2 is a schematic perspective view of the bag-in carton. 1 and 2, the bag-in carton includes a substantially rectangular parallelepiped box-shaped carton 2 constituting an outer container, and a flexible inner bag 3 accommodated therein, and the inner bag 3 includes a bag-in carton. The contents 4 made of a liquid such as ink is accommodated. The carton 2 has an inclined surface formed between two adjacent surfaces of a rectangular parallelepiped, and the carton 2 includes four flat side surfaces 2a, 2b, 2c and 2d, end surfaces 2e and 2f, end surfaces 2f and side surfaces 2a. And an inclined surface 2g formed between the two.
[0019]
A spout 5 communicating with the inner bag 3 is attached to the inclined surface 2 g of the carton 2, and the spout 5 is closed with a cap 6. The spout 5 has a cylindrical portion 5a extending into the inner bag 3, and a groove-like passage 5b for allowing liquid to pass through is formed at the inner bag 3 side end of the cylindrical portion 5a. Yes. By forming the passage 5b, the contents 4 can be sucked into the spout 5 even if the tip of the cylindrical portion 5a is blocked by the inner bag 3. The protruding height of the spout 5 from the carton 2 is determined so that the cap 6 enters a region surrounded by the extended surfaces of the side surface 2a and the end surface 2f when the cap 6 is attached. With such a configuration, a large number of back-in cartons can be arranged and stacked.
[0020]
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.
[0021]
That is, as shown in FIGS. 1 to 3, the inner bag 3 includes a pair of side surfaces 2 b, 2 d that are adjacent to the inclined surface 2 g and are opposed to each other among the inclined surface (outlet attachment surface) 2 g of the inner surface of the carton 2. And it adheres to the substantially whole area of the side surface 2a adjacent to the lower side of the inclined surface 2g. The inner bag 3 is also partially adhered to the side surface 2c among the separated surfaces that are not adjacent to the inclined surface 2g. In FIG. 2, the adhesive region 9 of the inner bag 3 is shown. 3 shows a carton blank 2 'for carton molding. In FIG. 3, in the adhesive region 9, the hatched portion in two directions is a non-peeled region that does not peel, and the hatched portion in one direction is a peeled region. is there.
[0022]
Thus, among the inner surfaces of the carton 2, the inner bag 3 is adhered to substantially the entire area of the inclined surface 2g, the pair of side surfaces 2b, 2d, and the side surface 2a below the inclined surface 2g, and also partially adhered to the side surface 2c. By doing so, the inner bag 3 can be firmly fixed in the carton 2. Further, the adhesion between the carton 2 and the inner bag 3 is performed by a peelable adhesive. For this reason, the inner bag 3 can be accommodated and the inner bag 3 can be easily peeled from the carton 2 as the contents 4 are reduced.
[0023]
The inner bag 3 is adhered to the side surface 2c in the adhesive region 9. 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. In this case, the inner bag 3 first begins to peel from the side surface 2 c away from the spout 5. By marking the inner bag 3 on the side surface 2c, the inner bag 3 can be easily separated from the side surface 2c. The adhesive area 9 of the inner bag 3 on the side surface 2c may be square as shown in FIG. 3 or may be rectangular.
[0024]
Next, a method for manufacturing the bag-in carton 1 having the above configuration 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. It should be noted that the adhesive region 9 is formed on the inner surface of the panel 2a ', 2b', 2c ', 2d', 2g '(the region that becomes the side surfaces 2a, 2b, 2c, 2d, and the inclined surface 2g of the carton 2) of the carton blank 2'. Is formed. As shown in FIG. 4, in parallel with the production of the carton blank 2 ′, the film is bent into a cylindrical shape and its end edge is cylinder-attached (back-sealed), and this back seal forms the back seal portion 16. At the same time, a cylindrical film 3 ′ cut to a predetermined length (the upper and lower ends are sealed in a subsequent step to form an inner bag) is prepared.
[0025]
Next, an adhesive such as vinyl acetate, acrylic copolymer, vinyl acetate is applied to the adhesive region 9 formed in substantially the entire area of each of the panels 2a ', 2b', 2d 'and the panel 2g' of the carton blank 2 '.・ Emulsion type adhesive such as acrylic copolymer or modified acrylate copolymer is applied. Further, an adhesive is applied to the adhesive region 9 partially formed on each of the panel 2c ′ and the adhesive margin 2h ′. The adhesive margin 2i 'of the carton blank 2' is a portion that is folded inward when assembling the carton, and this adhesive margin 2i 'also includes an adhesive, such as an ethylene / vinyl acetate copolymer system, a polyvinyl acetate system, Hot melt adhesives such as polyamide, polyethylene, styrene / butadiene copolymer, styrene / isoprene copolymer, polyisobutylene, and polyester are applied. Further, the same adhesive as that of the adhesive margin 2i ′ is applied to the back surface of the adhesive margin 2h ′.
[0026]
Next, as shown in FIG. 3, a tubular film 3 'is bonded to the panels 2a', 2d ', 2g' of the carton blank 2 'using an adhesive. In this case, the tubular film 3 ′ is disposed so that the back seal portion 16 comes into contact with the side surface 2 c when the carton blank 2 ′ is assembled and is opposed to the spout 5. Next, the panels 2b 'and 2c' of the carton blank 2 'are folded on the cylindrical film 3' and stuck on the cylinder, and the panels 2b 'and 2c' and the adhesive margin 2h 'are stuck on the cylindrical film 3'. Panel 2b 'and panel 2h'. In this way, a flat bag-in carton before assembly is formed.
[0027]
Next, the flat bag in carton 1 is sent to an assembling and filling process. In this assembling and filling process, the bag in carton 1 is assembled and filled with contents. The assembly process of the bag in carton will be described with reference to FIGS.
[0028]
First, as shown in FIG. 5 (a), the bag-in carton 1 is assembled by being raised in a prismatic shape while being supported by the support portion 27, and openings are formed on both sides (both sides in the vertical direction) of the carton 2. Openings are also formed on both sides of the bag 3. In FIG. 5A, the carton 2 has a first side panel 24 and a second side panel 25 at the openings on both sides.
[0029]
Next, as shown in FIG. 5B, the pair of arms 28 descend from the upper opening (one side opening) of the carton 2. Next, the pair of arms 28 enter 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).
[0030]
Next, as shown in FIG. 5 (d), the female die 29 descends from one side opening of the carton 2 and enters the inner bag 3, and then the male die 30 approaches the female die 29, The spout attachment portion 15 (see FIG. 3) of the carton 2 is punched between the mold 29 and the male mold 30.
[0031]
Thereafter, as shown in FIG. 6A, it is confirmed whether or not the spout attachment portion 15 is punched out by the photoelectric tube 31 with respect to the punched spout attachment portion 15. Next, as shown in FIG. 6 (b), the spout holding portion 32 holding the spout 5 descends from one side opening of the carton 2 and enters the inner bag 3, and the spout holding portion 32 further pours out. The outlet 5 is attached to the carton 2 by moving to the outlet attachment portion 15 side.
[0032]
Then, as shown in FIG.6 (c), it is confirmed whether the spout 5 was attached by the photoelectric tube 33. FIG. Next, as shown in FIG. 6 (d), the ultrasonic oscillator 34 approaches the spout 5, and at the same time, the sound generator 35 descends from one side opening of the carton 2 and enters the inner bag 3. In this state, an ultrasonic wave is output from the ultrasonic generator 34, and the spout 5 is ultrasonically sealed and fixed to the carton 2.
[0033]
Thereafter, as shown in FIG. 7A, the pair of arms 41 descend from one side opening of the carton 2 and enter the inner bag 3 to push the inner bag 3 apart. At the same time, the carton pawl 42 approaches the carton 2 and pushes the one side panel 24 of the carton 2 apart.
[0034]
Next, as shown in FIG. 7B, the pair of sealing arms 44 descend from the one side opening of the carton 2 and enter the inner bag 3 to push the one side opening of the inner bag 3 wide. At the same time, the pair of presser bars 46 and the pair of seal bars 47 shown in FIG. 7 (e) approach the one side opening of the inner bag 3 and are opened by the pair of sealing arms 44. First, the pair of presser bars 46 are pressed. Next, the pair of seal bars 47 linearly seal the one side opening of the inner bag 3, and the linear first seal portion 10 is formed in the one side opening of the inner bag 3. In this case, a pair of triangular flaps 11 is formed by the first seal portion 10 of the inner bag 3. FIG. 7E is a view of the inner bag 10 shown in FIG.
[0035]
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). A holding plate 48 having a pair of side plates 48 a is disposed on the upper surface of the first seal portion 10 of the inner bag 3.
[0036]
Next, a pair of pressing plates 49, 49 are pressed against the pair of side plates 48a, and the pair of triangular flaps 11 formed on one side of the inner bag 3 are pressed. In this way, the air in the pair of triangular flaps 11 is exhausted.
[0037]
Next, as shown in FIG. 8A, the seal bar 51 approaches the pair of triangular flaps 11, and the second seal that goes straight to the first seal portion 10 at the base ends of the pair of triangular flaps 11 by the seal bar 51. A portion 12 is formed, and the first seal portion 10 and the second seal portion 12 form a one-side seal sealing portion of the inner bag 3. By forming the second seal portion 12 at the base ends of the pair of triangular flaps 11 as described above, the content does not enter the pair of triangular flaps 11 and the remaining amount of the content does not increase accordingly.
[0038]
Next, as shown in FIG. 8B, the pair of triangular flaps 11 of the inner bag 3 and the one side panel 24 corresponding to the triangular flaps 11 are sequentially folded, and the pressing plate 54 disposed above the carton 2; Adhesion and molding of the one-side panel 24 are performed between the lower opening (other side opening) of the carton 2 and the molding receiver 53 that has entered the inner bag 3.
[0039]
Next, as shown in FIG. 8 (c), all the one side panels 24 are folded, and the pressing plate 56 disposed above the carton 2 and the molding that has entered the inner bag 3 from the other side opening of the carton 2. Adhesion and molding of one side of the carton 2 is performed with the receiving tray 55, and thus one side of the carton 2 is sealed.
[0040]
Next, as shown in FIG. 8 (d), a pressing plate 58 is disposed above the sealed one side of the carton 2, and the forming jig 57 opens the other side opening of the carton 2 and the other side opening of the inner bag 3. It goes into the inner bag 3 sequentially. In this state, the forming jig 57 presses the one-side sealed portion of the inner bag 3 formed by being sealed by the first and second seal portions 10, 12 against the one-side sealed portion of the carton 2. At this time, the pressing force of the forming jig 57 is received from the pressing plate 58.
[0041]
In this way, by pressing the one-side sealed portion of the inner bag 3 against the one-side sealed portion of the carton 2 by the forming jig 57, the one-side sealed portion of the inner bag 3 is moved to the one-side sealed portion ( It can be formed in a regular and always stable shape according to the shape of the box.
[0042]
Moreover, if the inner bag is not stored regularly and in a stable shape, the remaining amount of the contents after use increases and the variation in the remaining amount increases.
[0043]
In general, only by sealing one side of the flexible inner bag 3 and storing the one-side seal sealing portion of the inner bag 3 in the carton 2, the one-side sealing sealing portion of the inner bag 3 is contained in the carton 2. Various shapes will be taken, and for this reason, the inner volume of the inner bag 3 will vary.
[0044]
Moreover, if the inner bag is not stored regularly and in a stable shape, the remaining amount of the contents after use increases, and the variation in the remaining amount increases.
[0045]
In the present invention, the one-side seal sealing portion of the inner bag 3 is molded using the forming jig 57 in accordance with the shape of the one-side sealing portion of the carton 2, so that the one-side seal sealing portion of the inner bag 3 is accurate. Therefore, the inner volume of the inner bag 3 can be kept constant. At the same time, as a result of regularly storing the inner bag in a stable shape, the remaining amount after use can be reduced. Therefore, a certain amount of contents can be stored in the inner bag 3 with high accuracy. Moreover, since the spout 5 is attached to the inclined surface g (refer FIG. 2) of the carton 2, about the part corresponding to the inclined surface 2g of the carton 2 among the one side sealing sealing parts of the inner bag 3, it is an inclined surface. It can be formed in a regular and always stable shape according to the shape of 2g, and then the other side opening of the inner bag 3 is sealed and sealed in the same manner, and then the other side of the carton 2 is sealed and thus Then, the bag-in carton 1 in which the inner bag is stored in the carton 2 is assembled.
[0046]
In addition, since these processes can be implemented by applying a conventional bag-in-carton manufacturing technique, description of manufacturing equipment and the like is omitted. Finally, the contents 4 such as ink are filled, and the state shown in FIG.
[0047]
When the bag-in carton 1 filled with the contents 4 is used, as shown in FIGS. 1A and 1B, the bag-in carton 1 is used with a printing machine or the like with the spout 5 at the bottom. The machine is set, and a connector (not shown) of a suction device provided on the machine used is connected to the spout 5 and the contents 4 are sucked out from the spout 5. At this time, the inner bag 3 starts to peel from the dotted adhesive region 9 on the side surface 2c, and then peels from the pair of side surfaces 2b and 2d. As the contents 4 are sucked out, the peeled portion of the inner bag 2 is deformed as shown by two-dot chain lines 21a and 21b in FIG. 1 (b) and moves to the spout 5 side. The contents 4 to be put in are taken out. Finally, the peeled portion of the inner bag 3 enters the remaining half of the fixed portion (non-peeled portion) fixed to the inner surface of the carton 2, and almost all the contents are taken out.
[0048]
Next, the adhesive strength between the peeled portion and the non-peeled portion of the inner bag 3 will be described.
[0049]
The adhesive strength between the peeled portion and the non-peeled portion is as follows.
[0050]
Adhesive strength (force (gf) required for peeling when a test piece cut to a width of 15 mm was subjected to a tensile test at room temperature)
Non-peeling part approx. 470 gf
Peeling part about 210gf
It becomes.
[0051]
As described above, according to the present embodiment, since the second seal portion 12 that is orthogonal to the first seal portion 10 is provided at the proximal end of the triangular flap 11 of the inner bag 3, the contents are contained in the triangular flap 11. A bag-in carton having such a triangular flap 11 can be manufactured easily and continuously without entering the remaining amount of contents. Moreover, the 2nd seal | sticker part 12 has the reinforcement effect, can maintain the inner bag 3 in a substantially rectangular parallelepiped shape, and can deform | transform the whole inner bag neatly at the time of the suction of the contents. Further, since the one-side seal sealing portion of the inner bag 3 is molded using the forming jig 57 in accordance with the shape of the one-side sealing portion of the carton 2, the one-side seal sealing portion of the inner bag 3 can be accurately molded. Thus, the inner volume of the inner bag 3 can be kept constant.
[0052]
In each of the above-described embodiments, the spout 5 is provided with the cylindrical portion 5a extending into the inner bag 3. However, the spout 5 is not limited to this configuration, and a normal portion that does not include the cylindrical portion. A thing may be used. In addition, an appropriate passage member (for example, a bar-like member having an H-shaped cross section) is provided at the bottom of the inner bag 3 so that a passage through which the contents flow can be surely formed even when the movable part of the inner bag 3 gets stuck. It may be inserted.
[0053]
Further, the case where the bag in carton 1 is set in the machine so that the spout 5 is on the lower side has been described when the contents are taken out, but the content taking out from the bag in carton 1 is limited to this state. However, the outlet 5 can be changed as appropriate depending on the machine that sets the bag-in carton 1. When the bag-in carton 1 is set in 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.
[0054]
Moreover, the storage state of the interior can always be a stable shape, and the remaining amount after use can be reduced.
[0055]
【The invention's effect】
According to the present invention, the one side opening of the inner bag is linearly sealed to form a pair of triangular flaps, and the base ends of the pair of triangular flaps are respectively sealed to form the one side seal sealing portion. It is possible to easily and continuously produce a bag-in carton in which the contents do not enter the triangular flap.
[Brief description of the 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 for producing a bag-in carton and a film with a cylinder attached thereto.
FIG. 4 is a schematic plan view showing a cylindrical film attached to a carton blank.
FIG. 5 is a view showing a manufacturing process of a bag-in carton.
FIG. 6 is a view showing a manufacturing process of a bag-in carton.
FIG. 7 is a view showing a manufacturing process of the bag-in carton.
FIG. 8 is a view showing a manufacturing process of the bag-in carton.
[Explanation of symbols]
DESCRIPTION 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 Outlet 9 Adhesion area | region 10 1st seal part 11 Triangle flap 12 2nd seal part 16 Back seal part 46 A pair of presser bars 47 A pair of seal bars 48 A holding plate 48a A pair of side plates 51 A seal bar 57 A forming jig 58 A press plate

Claims (1)

Adhering a flexible inner bag made of a tubular film to a predetermined position of a carton blank for carton molding;
Assembling a carton having a carton blank raised like a prism and having openings on both sides;
A step of linearly sealing one side opening of the inner bag located at one side opening of the carton to form a pair of triangular flaps;
Sealing the base ends of a pair of triangular flaps formed at one side opening of the inner bag to form a one side seal sealing part;
After folding the pair of triangular flaps of the inner bag inward, folding and sealing one side opening of the carton, forming a one side sealing part;
With
After forming the one side sealing part of the carton, a molding jig is inserted into the inner bag from the other side opening of the carton and the other side opening of the inner bag, and the one side sealing sealing part of the inner bag is cartoned by this molding jig. A method for manufacturing a bag-in carton, further comprising a step of pressing the inner side sealing portion against the inner side sealing portion of the inner bag so as to conform to the one side sealing portion of the carton.

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