JP3662648B2 - Press welding device for triangular flap part of packaging container in packaging machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pair of pre-folded and heated triangular flap portions of an unfinished packaging container that is divided and formed by sealing at regular intervals from a long tubular member filled with contents and formed of a laminate packaging material. The present invention relates to a pressure welding apparatus that presses and welds one surface of a packaging container.
[0002]
[Prior art]
Conventionally, a parallelepipedic brick (brick) packaging container (pack container) filled with liquid food such as milk or juice is manufactured by first using a long tubular member from a laminate packaging material provided with a fold. After forming and filling the tube member with the content liquid (liquid food) with a filling machine and sealing it at regular intervals, the tube member is cut and divided at the sealed portion. Then, as shown in FIG. 7, upper and lower end portions 1a and 1b of the divided packed packaging container 1 are folded to form a pair of upper and lower triangular flap portions 3 and 5, each triangular flap portion. 3 and 5 are performed by welding to the surface of the packaging container 1, respectively. Among these triangular flap portions 3, 5, the upper triangular flap portion 3 erected from the crossing corner portion 10 between the container bottom surface 7 (upper surface when the packaging container 1 is manufactured) and the container side surface 9 is formed on the container bottom surface 7. The lower triangular flap portion 5 which is welded and is erected from the crossing corner portion 12 between the container upper surface 11 (bottom surface when the packaging container 1 is manufactured) and the container side surface 9 is welded to the container side surface 9 (Akira Akai). 63-156901).
[0003]
As shown in FIG. 8, the press welding apparatus for welding the triangular flap portion 3 includes a pressing body 13 that is pressed toward the container bottom surface 7 and a pressurizing mechanism 15 that moves the pressing body 13 up and down. The outer periphery of the pressing front end portion 17 of the pressing body 13 is formed in a substantially rectangular shape slightly larger than the outer periphery of the container bottom surface 7, and the pressing front end portion 17 of the pressing body 13 is in contact with the upper triangular flap portion 3. A pair of flap contact surfaces 19 in contact with each other and a pair of container contact surfaces 21 in contact with the container bottom surface 7 are provided. As shown in FIG. 9, the flap contact surface 19 is a substantially triangular plane corresponding to the triangular flap portion 3, and the apex 19 a side corresponding to the standing tip 3 a of the triangular flap portion 3 faces the container bottom surface 7. It is inclined so as to protrude downward. As shown in FIG. 10, a bolt insertion hole 23 is formed in the pressing body 13, and the pressing body 13 is fastened and fixed to the pressurizing mechanism 15 by a bolt 25 inserted through the bolt insertion hole 23.
[0004]
The upper triangular flap 3 is welded immediately after the contact portion between the triangular flap 3 and the container bottom surface 7 is heated by a heating device (not shown) and the resin material previously laminated on the container surface is melted as shown in FIG. As shown, the triangular flap portion 3 is pressed against the container bottom surface 7 by the flap contact surface 19 of the pressing body 13. Here, since the flap contact surface 19 has an inclined surface shape, when the triangular flap portion 3 is pressed, the central portion of the container bottom surface 7 is deformed and depressed forward of the pressing, and the content liquid filled with such deformation is recessed. The reaction force increases, and the triangular flap portion 3 and the container bottom surface 7 are in close contact with each other. Thereby, the resin material melted by the heating device becomes a welding medium, and the triangular flap portion 3 is welded to the container bottom surface 7 through the resin material. Moreover, since the center part of the container bottom surface 7 after welding is in a slightly depressed state, stability when placing the packaging container 1 is ensured.
[0005]
[Problems to be solved by the invention]
However, in such a conventional pressure welding apparatus, since the flap contact surface 19 is a substantially triangular inclined surface corresponding to the triangular flap portion 3, the pressing force to the triangular flap portion 3 is not applied to the flap. It will most strongly act on the standing tip 3a that contacts the apex 19a of the contact surface 19. On the other hand, the triangular flap 3 and the container bottom surface 7 are welded mainly at the central portion A where they can come into contact with each other over a wide range. There was a possibility that the welding force would be insufficient.
[0006]
Further, if it is attempted to avoid such inconvenience by increasing the pressing force, the pressing force acting on the standing tip 3a of the triangular flap portion 3 becomes excessive, and if the content liquid remains on the standing tip 3a, it remains. Since the standing tip 3a may be torn due to the internal pressure of the content liquid, both sufficient securing of the welding force between the triangular flap portion 3 and the container bottom surface 7 and prevention of breaking of the standing tip 3a should be achieved. It was difficult.
[0007]
The present invention has been made in order to solve such a conventional problem. The object of the present invention is to secure a sufficient welding force between the triangular flap portion and the bottom of the container and to stand up with a simple configuration. An object of the present invention is to provide a pressure welding apparatus capable of achieving both prevention of breakage of the tip.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided an intersection angle between one surface of an unfinished packaging container filled with the content liquid and sealed at both ends of the tubular member, and opposite side surfaces bent from the one surface. In the press welding apparatus provided with a flap pressing portion that is erected and presses the pair of triangular flap portions bent in advance at the crossing corner portion against the one surface and welds it via a welding medium, the flap pressing portion is The tip side abutting portion that comes into surface contact with the standing base end side excluding the vicinity of the standing tip of the triangular flap portion and that contacts the standing tip side of the triangular flap portion is the standing base end. It is characterized by having a pair of inclined surfaces protruding forward from the proximal end contact portion that contacts the side.
[0009]
Invention of Claim 2 is a press welding apparatus of Claim 1, Comprising: The said flap press part is the said press front end part of the press body pressed toward one surface of the said packaging container, The triangular flap portion is formed in a substantially trapezoidal shape that comes into surface contact with a trapezoidal portion excluding the vicinity of the standing tip, and the pressing body is divided into opposite oblique sides of the pair of flap pressing portions and contacts the one surface. It has a pair of substantially trapezoidal container contact surfaces in contact with each other.
[0010]
In invention of Claim 1 or Claim 2, a triangular flap part is pressed on one surface of a packaging container with a flap press part, and a triangular flap part is welded to one surface. Since the flap pressing part has an inclined surface shape, one surface of the packaging container is deformed and depressed forward, the reaction force of the content liquid filled with the deformation increases, and the triangular flap part and one surface Is brought into close contact, and the triangular flap is welded to one surface through the welding medium. At this time, since the flap pressing portion is in surface contact with the standing base end side excluding the vicinity of the standing tip of the triangular flap portion, the tip-side contact portion where the pressing force acts most strongly is the triangle flap portion. The central part of the triangular flap part where the one surface abuts in a wide range is pressed. That is, the pressing force can be applied most strongly to the central portion where the triangular flap portion and one surface are to be most closely adhered to each other without applying the pressing force in the vicinity of the standing tip of the triangular flap portion.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0012]
1 is a cross-sectional view showing a pressure welding apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a heating device provided in a pre-process of the pressure welding apparatus of FIG. 1, and FIG. 3 is a pressure welding of FIG. FIG. 4 is a perspective view of the pressing body of FIG. 3, FIG. 5 is a sectional view showing the usage state of the press welding apparatus of FIG. 1, and FIG. 6 is an enlarged view of the main part of FIG.
[0013]
As shown in FIG. 1, a pair of upper and lower (four locations) triangular flap portions 3, 5 are provided in the divided and filled unfinished packaging container 1. The upper triangular flap portion 3 is erected from the crossing corner portion 10 of the container bottom surface 7 (upper surface when manufacturing the packaging container 1) as one surface and the container side surface 9 as both side surfaces, and the lower triangular flap portion 5 is erected from a crossing corner portion 12 between the container upper surface 11 (the bottom surface when the packaging container 1 is manufactured) and the container side surface 9.
[0014]
The pressure welding device 31 includes a pressing body 33 that presses the upper triangular flap portion 3 against the container bottom surface 7, a pair of side pressing bodies 35 that press the lower triangular flap portion 5 against the container side surface 9, and the pressing body 33. A pressurizing mechanism 37 that moves the side pressing body 35 substantially horizontally and moves the side pressing body 35 horizontally is provided.
[0015]
The pressurizing mechanism 37 includes a hydraulic cylinder 41 that is driven in the vertical direction by hydraulic power supplied from the hydraulic inflow portion 43, and a link member 49 that converts the vertical drive of the hydraulic cylinder 41 into a substantially horizontal drive. ing. The pressing body 33 is connected to the hydraulic cylinder 41 via a pressure adjusting spring 47, and the pressing force applied from the hydraulic cylinder 41 to the upper triangular flap portion 3 is adjusted to a desired pressure by the pressure adjusting spring 47. The Both link members 49 are provided such that their tip portions approach each other as the hydraulic cylinder 41 moves downward, and move away from each other as the hydraulic cylinder 41 moves upward. Fastened and fixed. A return spring 45 that biases the hydraulic cylinder 41 upward is provided above the hydraulic cylinder 41.
[0016]
A heating device 60 as shown in FIG. 2 is provided in the pre-process of the pressure welding device 31. The heating device 60 includes an upper hot air nozzle 61 disposed between the inner side surface of the triangular flap portion 3 above the packaging container 1 and the container bottom surface 7 which are sequentially and intermittently conveyed on the conveyor 51 at a constant pitch. A lower hot air nozzle 63 disposed between the inner side surface of the lower triangular flap portion 5 and the container side surface 9 is provided. Both hot air nozzles 61 and 63 are wedge-shaped extending in the conveying direction of the packaging container 1 by a predetermined length, and the hot air nozzles 61 and 63 are formed with a plurality of nozzle holes 63 and 65 through which hot air is blown out. . The inside of each hot air nozzle 61, 63 communicates with a cylinder 69, and hot air is supplied to each hot air nozzle 61, 63 via a cylinder 61, 63 from a hot air generator (not shown). By supplying the hot air, the substantially central surface of the contact portion between the upper triangular flap portion 3 and the container bottom surface 7 and the substantially central surface of the contact portion between the lower triangular flap portion 5 and the container side surface 9 are formed. Heated.
[0017]
A pair of guide rails 53 are vertically extended on the conveyor 51. The upper and lower guide rails 53 are in contact with the upper and lower triangular flap portions 3 and 5, respectively, and the upper triangular flap portion 3 is bent at a predetermined angle from the left and right sides of the container bottom surface 7 to the container bottom surface 7 side in advance, or the lower triangle. The flap portion 5 is bent at a predetermined angle in advance toward the container side surface 9 side. As shown in FIG. 1, both guide rails 53 and the conveyor 51 are extended to the press welding apparatus 1 in the next process, and the pressing body 33 and the side pressing body 35 interfere with the guide rail 53 when pressed. The groove part 55 for avoiding is formed. The packaging container 1 is sequentially and intermittently conveyed to the pressure welding apparatus 1 by the conveyor 51, and the upper and lower triangular flap portions 3 and 5 are maintained in a state of being bent at a predetermined angle by the guide rail 53.
[0018]
As shown in FIG. 3, the outer periphery of the pressing front end portion 71 of the pressing body 33 is formed in a substantially rectangular shape slightly larger than the outer periphery of the container bottom surface 7, and the pressing front end portion 71 includes an upper triangular flap portion. A pair of flap contact surfaces 73 as flap pressing portions that contact 3 and a pair of container contact surfaces 75 that contact the container bottom surface 7 are provided.
[0019]
As shown in FIGS. 3 and 4, the flap contact surface 73 is in surface contact with the trapezoidal portion of the upper triangular flap portion 3 excluding the vicinity of the standing tip 3 a, and the upper triangular flap portion 3 stands upright. The distal end side abutting portion 73a that abuts on the installed distal end 3a side is a pair of substantially trapezoidal inclined surfaces that protrude forward from the proximal end abutting portion 73b that abuts on the standing proximal end 3b side. The container abutment surfaces 75 are a pair of substantially trapezoidal inclined surfaces that are partitioned on opposite oblique sides of the pair of flap abutment surfaces 73 and abut against the container bottom surface 7. The pressing front end surface 77 of the pressing body 33 is a substantially rectangular plane defined by the pressing front end of the flap contact surface 73 and the container contact surface 75.
[0020]
As shown in FIG. 6, a bolt insertion hole 79 is formed in the pressing body 33, and the pressing body 33 is fastened and fixed to the pressurizing mechanism 37 by a bolt 25 that passes through the bolt insertion hole 79.
[0021]
Next, the operation will be described.
[0022]
The upper and lower triangular flap portions 3 and 5 are welded by first contacting the surface of the substantially central portion of the contact portion between the upper triangular flap portion 3 and the container bottom surface 7, and the lower triangular flap portion 5 and the container side surface 9. The substantially central surface of the part is heated by the heating device 60 shown in FIG. 2 to melt the resin material previously laminated on the container surface. And the packaging container 1 immediately after heating is supplied to the press welding apparatus 31 by the conveyor 51, and as shown in FIG. 5, the hydraulic cylinder 41 is driven, the pressing body 33 is moved to the container bottom surface 7, and the side pressing body 35 is moved to the container. The upper triangular flap portion 3 is pressed against the container bottom surface 7 by the pressing body 33, and the lower triangular flap portion 5 is pressed against the container side surface 9 by the side pressing body 35. The upper and lower triangular flap portions 3 and 5 pressed by the pressing body 33 and the side pressing body 35 are bent at the crossing corner portions 10 and 12 (see FIG. 1) bent in advance, respectively.
[0023]
When the upper triangular flap portion 3 is pressed, the flap contact surface 73 and the container contact surface 75 of the pressing body 33 are both inclined, so that the central portion of the packaging bottom surface 7 is deformed forward. The reaction force of the content liquid filled with the depression and the deformation increases, and the triangular flap portion 3 and the container bottom surface 7 are brought into a close contact state. Thereby, the resin material melted by the heating device 60 becomes a welding medium, and the triangular flap portion 3 is welded to the container bottom surface 7 through the resin material. Moreover, since the center part of the container bottom surface 7 after welding is in a slightly depressed state, stability when placing the packaging container 1 is ensured.
[0024]
When the upper triangular flap 3 is pressed, as shown in FIG. 6, the flap contact surface 73 is located on the side of the standing base end 3b (triangle) excluding the vicinity of the standing tip 3a of the triangular flap portion 3. The front end side abutting portion 73a to which the pressing force from the pressurizing mechanism 37 acts most strongly is formed on the triangular flap portion 3 and the container. The central portion A of the triangular flap portion 3 with which the bottom surface abuts over a wide range is pressed.
[0025]
Therefore, the pressing force can be applied most strongly to the central portion where the triangular flap portion 3 and the container bottom surface 7 are to be most closely contacted without applying the pressing force in the vicinity of the standing tip 3a of the triangular flap portion 3. With a simple configuration, both sufficient securing of the welding force between the upper triangular flap 3 and the container bottom surface 7 and the prevention of breakage of the standing tip 3a of the triangular flap 3 due to the internal pressure of the remaining content liquid are achieved. Can be planned.
[0026]
【The invention's effect】
As described above, according to the first or second aspect of the invention, the triangular flap portion and the one surface are applied in a wide range without applying a pressing force in the vicinity of the standing tip of the triangular flap portion. Sufficient pressing force can be secured at the central part of the triangular flap part in contact with it, ensuring a sufficient welding force between the triangular flap part and the bottom of the container and prevention of tearing of the standing tip with a simple configuration. Both can be achieved.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a pressure welding apparatus according to an embodiment of the present invention.
2 is a perspective view of a heating device provided in a pre-process of the press welding device of FIG. 1. FIG.
FIG. 3 is an enlarged perspective view of a main part of the press welding apparatus of FIG. 1;
4 is a perspective view of the pressing body of FIG. 3. FIG.
FIG. 5 is a cross-sectional view showing a usage state of the press welding apparatus of FIG. 1;
6 is an enlarged view of a main part showing a part of FIG. 5 in cross section. FIG.
FIG. 7 is a perspective view showing a divided packed packaging container.
FIG. 8 is an enlarged perspective view of a main part of a conventional pressure welding apparatus.
FIG. 9 is a perspective view of a conventional pressing body.
FIG. 10 is a cross-sectional view partially showing a use state of a conventional pressure welding apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Packaging container 3 Triangle flap part 3a Standing front-end | tip 3b of a triangular flap part Standing base end 7 of a triangular flap part Container bottom (one surface)
9 Container side (both sides)
DESCRIPTION OF SYMBOLS 10 Crossing angle part 33 Press body 71 Press front end part 73 of a press body Flap contact surface (flap press part)
75 Container contact surface

Claims (2)

It is erected from the crossing corner between one surface of an unfinished packaging container filled with the content liquid and sealed at both ends of the tubular member and the opposite side surfaces bent from the one surface. In a press welding apparatus provided with a flap pressing part that presses a pair of pre-bent triangular flap parts against the one surface and welds them via a welding medium,
The flap pressing portion is in surface contact with a standing proximal end side including a central portion of the triangular flap portion, and a distal end side abutting portion which is in contact with the standing distal end side of the triangular flap portion is the standing vertical side. A press welding apparatus, characterized in that a pair of inclined surfaces project forward from the base end side contact portion in contact with the base end side. The press welding apparatus according to claim 1,
The flap pressing portion is in surface contact with a trapezoidal portion on a standing base end side including a central portion of the triangular flap portion at a pressing front end portion of a pressing body pressed toward one surface of the packaging container. Formed in a substantially trapezoidal shape,
The pressure welding apparatus, wherein the pressing body has a pair of substantially trapezoidal container abutting surfaces that are partitioned in opposite oblique sides of the pair of flap pressing portions and abut against the one surface.

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