JP2654912B2 - How to seal a cardboard box with an inner bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically sealing a cardboard box with an inner bag after the contents are filled in the inner bag.

[0002]

2. Description of the Related Art In recent years, in order to store contents such as paints, a cardboard box with an inner bag in which an inner bag made of laminated paper is adhered to the inner surface of a thick cardboard box has replaced metal cans and the like. Became used.

When such a cardboard box with an inner bag is sealed after filling the inner bag with the contents, generally, the opening of the inner bag is folded inward at the corresponding two edges so that the other two edges are folded. Gussets that lie on top of each other,
The overlapping portion is hermetically sealed by heat welding, the sealed portion is folded under one of the upper lids which are abutted with each other and closed, and then a tape is applied to the abutting portion between the edges of the upper lids.

[0004]

Conventionally, all of these operations have been performed manually, which is troublesome regardless of whether the opening of the inner bag is gusset-folded or the overlapped portion is thermally welded. In addition, it was troublesome to bend the top cover because the cardboard was thick.
In addition, the lifting of the upper lid after applying the tape was also a problem.

[0005] That is, there is a drawback that the efficiency is poor due to manual operation, and that the sealed state tends to vary.

[0006]

SUMMARY OF THE INVENTION The present invention has been completed in view of the above points. An inner bag made of laminated paper is adhered to the inner surface of a box, and a corresponding pair of upper edges of the box are provided. A method of sealing a cardboard box with an inner bag in which an inner bag is connected to a triangular upper lid on the edge and a square upper lid on the other two edges, respectively, wherein the upper lid is folded by a triangular lid. Bending the upper lid and the rectangular upper lid at different timings, folding the corresponding two edges of the opening of the inner bag inward, and performing gusset folding in which the other two edges are overlapped with each other; Heating the overlapped edges of the opening, and holding the corresponding sides of the box from both sides indented by the box pressing means while holding the overlapped edges of the opening of the inner bag by the inner bag sealing means. Work to squeeze and seal the part from both sides The step of sucking and causing one of the rectangular upper lids by the upper lid inducing means, the step of pushing the closed portion of the opening of the inner bag into the lower surface of the upper lid caused by the sealing part pushing means, and the upper lid pushing means. The upper cover is pushed down again to match the corresponding upper cover with the edge, and a step of applying a tape along the butted edges of both upper covers by tape attaching means.

[0007]

[Function] When the contents are filled in the inner bag, the upper cover bending means firstly holds the triangular upper cover in a bent state by slightly bending the rectangular upper cover, and accordingly the opening of the inner bag corresponds. Are folded inward and the other two edges are overlapped with each other.

Next, the overlapping edges of the inner bag are heated by heating means to melt the laminated resin,
Subsequently, while the corresponding side surface of the box is pressed from both sides and held in a concave state by the box pressing means, the overlapped edges of the opening of the inner bag are pressed from both sides,
It is welded and sealed. When the inner bag is sealed, the pressing force applied to the box is removed.

Next, one of the rectangular upper lids is sucked and raised by the upper lid raising means, and the sealed portion of the opening of the inner bag is pushed into the raised lower surface of the upper lid by the sealing part pushing means.

Subsequently, the raised lid is pushed down again by the upper lid pushing means, and the corresponding upper lid and the edge are abutted against each other. Finally, the upper and lower edges of the two upper lids are abutted by the tape attaching means. A tape is stuck along and the sealing operation is completed.

[0011]

As described above, according to the method of the present invention, a series of sealing operations can be automatically performed, the work efficiency can be greatly improved, and uniform sealing can be achieved. it can. In particular, when the inner bag is sealed, the box is intentionally dented and the dent of the box is returned after the sealing is completed, so the upper surface of the inner bag is placed inside the box as the box returns to its original shape. When the upper lid is closed and tape is applied, the upper lid can be sealed in a package without lifting.

[0012]

An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the cardboard box with an inner bag according to the present embodiment is closed by isosceles triangular top lids 2a and 2b abutting each other at two corresponding edges of the upper edge of the cardboard box 1. Rectangular lids 3a and 3b are coupled to each other, and an inner bag 5 made of laminated paper is inserted therein.
Are accommodated, and the upper lids 2a, 2b, 3a,
3b is glued over the back surface. However, only the upper rectangular lid 3a on the front side is glued halfway to its height.

When the contents are filled in the inner bag 5 of such a cardboard box with an inner bag, the cardboard box 1 is conveyed on a conveyor (not shown), and at a folding position of the upper lid provided in the middle, first, as shown in FIG. As shown in FIG. 1, the triangular upper covers 2a, 2b are first placed inside the rectangular upper covers 3a, 3b inside the opening of the inner bag 5 while the attachment plates 11 are fitted from above. Folded. The two edges corresponding to the inside of the rectangular upper lids 3a and 3b of the opening of the inner bag 5 are prevented from tilting by the attachment plate 11, so that the two inner edges of the triangular upper lids 2a and 2b It is folded while protruding in the direction.

Subsequently, as shown in FIG. 2, the rectangular upper lids 3a and 3b are also folded inward with a delay while the attachment plate 11 is pulled upward, and are held in a folded state. However, as shown in FIG. 3A, the corresponding two edges are folded inward, and the other two edges are gusset-folded so as to overlap each other.

Next, the cardboard box 1 is further transported,
As shown by a dashed line in the figure, the gusset-folded portion 6 of the inner bag 5 is provided with a pair of heaters 1 arranged so as to sandwich it.
By passing between the two, the laminated resin of the gusset-folded portion 6 is heated and melted.

Subsequently, as shown in FIG. 3 (B), both side surfaces connected to the rectangular upper lids 3a and 3b of the cardboard box 1 are pressed and dented, and in this state, the cardboard box 1 is further transported. As shown in FIG. 3C, the overlapped portion 6 of the inner bag 5 is pressed from both sides by a pair of rollers 13 cut with a stitch knurl, so that the overlapped portion 6 is welded. And sealed.

When the sealing is completed, the pressing force applied to the side surface of the cardboard box 1 is removed, and the box 1 returns to its original shape, whereby the upper surface of the inner bag 5 is drawn into the box 1.

Next, as shown in FIG. 4, the rectangular upper lid 3a on the front side to which the inner bag 5 is partially attached is sucked by the vacuum suction tool 14 to be raised by a predetermined angle. As the pushing plate 15 advances along the upper surface of the rectangular upper lid 3b, as shown in FIG. 5, the closed portion 7 of the opening of the inner bag 5 is pushed into the raised lower surface of the upper lid 3a.

Subsequently, the raised upper lid 3a is pushed down again by the vacuum suction tool 14, and the corresponding upper lid 3b and the edges are abutted. Finally, as shown in FIG.
A tape 8 is applied along the butted edges of the upper lids 3a, 3b, and the sealing operation is completed.

As described above, according to the method of the present embodiment, the packing operation can be automatically and efficiently performed, and the packing can be uniformly performed. In particular, the cardboard box 1 is intentionally dented when the inner bag 5 is sealed, and the dent of the box 1 is returned after the sealing is completed. Can be drawn into the box 1 so that after the tape 8 has been applied,
The floating of a and 3b is effectively prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a process of bending a triangular upper lid.

FIG. 2 is a perspective view showing a step of bending a rectangular upper lid following a triangle.

FIG. 3A is an explanatory diagram of a step of heating a gusset-folded portion of an inner bag. (B) is a front view of the process of pressing the gusset-folded part while denting the box.
(C) is a partial perspective view of the same step.

FIG. 4 is a perspective view of a step of causing an upper lid.

FIG. 5 is a partial front view of a step of pushing a sealed portion of the inner bag.

FIG. 6 is a perspective view of the box after completion of the box.

[Explanation of symbols]

1: Cardboard box 2a, 2b: (triangular) top cover 3
a, 3b: (rectangular) top lid 5: inner bag 6: (inner bag 5
Gusset folded part 7): Sealed part (of inner bag 5)
8: Tape 11: Attached plate 12: Heater 13: Roller 14: Vacuum suction device 15: Push-in plate

Claims (1)

(57) [Claims] An inner bag made of laminated paper is stuck on the inner surface of the box, and a triangular upper cover is coupled to two corresponding upper edges of the box, and a square upper lid is coupled to the other two edges, respectively. A method of sealing a cardboard box with an inner bag after filling the contents in the inner bag, and folding the triangular upper cover and the rectangular upper cover at different timings by upper cover bending means, thereby bending the inner bag. Gusset folding in which the corresponding two edges of the opening of the bag are folded inward and the other two edges are overlapped with each other; heating the overlapped edge of the opening of the inner bag by heating means; Means for closing the overlapped edges of the opening of the inner bag from both sides by means of the inner bag sealing means while holding the corresponding side surfaces of the box pressed and dented from both sides by means; By means of cause Adsorbing and raising one of the rectangular upper lids; pushing a closed portion of the opening of the inner bag into the lower surface of the upper lid raised by the sealing portion pressing means; and closing the upper lid raised by the upper lid pushing down means. A cardboard with an inner bag, comprising: a step of pushing down again to abut the corresponding upper lid and the edge, and a step of applying a tape along the abutted edge of the upper lids by a tape attaching means. Box sealing method.