JPH09183405A - Pressure welding device of triangular flap of packaging container in packing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure sufficient welding force between triangular flaps and a container bottom face by a simple structure, and at the same time, to prevent erected head ends from being broken. SOLUTION: A pair of triangular flaps 3 which are arranged in an erected manner from intersecting angled sections 10 between a container bottom face 7 and container side faces 9 of an incomplete packing container 1 and previously folded at the intersecting angled sections 10 are pressed to the container bottom face 7 for welding by a pressure welding device through a welding medium. Flap pressing sections are made to be a pair of flap butting faces 73 having slant faces which butt at their faces against erected base ends 3b excepting vicinities of erected head ends 3a among the triangular flaps 3 and protrude forward in the pressing direction further than base end-side butting sections 73b where head end-side butting sections 73a which butt against the erected head ends 3a of the triangular flaps 3 butt against the erected base ends 3b. Thus, without making a pressing force work on the vicinities of the erected head ends 3a of the triangular flaps 3, the pressing force can be made to work on the central part the most wherein the triangular flaps 3 and the container bottom face 7 are to be fast adhered the most.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pre-folded and heated unfinished packaging container formed by dividing a long tubular member filled with contents and formed of a laminated packaging material by sealing at regular intervals. A pair of triangular flaps,
The present invention relates to a pressure welding device for pressing and welding one surface of a packaging container.

[0002]

2. Description of the Related Art Conventionally, the manufacturing of a parallelepiped brick-shaped (brick-shaped) packaging container (pack container) filled with liquid food such as milk or juice is first carried out from a laminated packaging material provided with folds in advance. Forming a long tubular member,
The tube member is filled with a content liquid (liquid food) by a filling machine, and the tube member is sealed at regular intervals, and then the tube member is cut and divided at the sealed portion. Then, as shown in FIG. 7, the upper and lower end portions 1 of the divided filled packaging container 1 are
By folding a and 1b, a pair of upper and lower (4 places) triangular flap portions 3 and 5 are formed.
Are welded to the surface of the packaging container 1, respectively. Of these triangular flap portions 3 and 5, an upper triangular flap portion 3 which is erected from an intersection corner portion 10 of a container bottom surface 7 (an upper surface when the packaging container 1 is manufactured) and a container side surface 9.
Is welded to the bottom surface 7 of the container, and the top surface 11 of the container (packing container 1
Corner portion 12 between the bottom surface (at the time of manufacturing) and the container side surface 9
The lower triangular flap portion 5 standing upright from the container side surface 9
(See Japanese Utility Model Laid-Open No. 63-156901).

As shown in FIG. 8, the pressure welding device for welding the triangular flap portion 3 is provided with a pressing body 13 that is pressed toward the bottom surface 7 of the container and a pressing mechanism 15 that moves the pressing body 13 up and down. ing. 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 contacts the upper triangular flap portion 3. A pair of flap contact surfaces 1 that contact
9 and a pair of container contact surfaces 21 that contact the container bottom surface 7. As shown in FIG. 9, the flap contact surface 1
Reference numeral 9 is a substantially triangular flat surface corresponding to the triangular flap portion 3, and the apex 19a side corresponding to the standing tip 3a of the triangular flap portion 3 is inclined so as to project downward toward the container bottom surface 7. Further, as shown in FIG.
A bolt insertion hole 23 is formed in the bolt insertion hole 23, and the pressing body 13 is pressed by the bolt 25 inserted through the bolt insertion hole 23.
It is fastened and fixed.

The welding of the upper triangular flap portion 3 is carried out immediately after the contact portion between the triangular flap portion 3 and the bottom surface 7 of the container is heated by a heating device (not shown) to melt the resin material previously laminated on the surface of the container. As shown in FIG. 10, the pressing body 1
This is performed by pressing the triangular flap portion 3 against the container bottom surface 7 by the flap contact surface 19 of 3. 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 dented forward, and the content liquid filled with the deformation is The reaction force increases, and the triangular flap portion 3 and the container bottom surface 7 come into close contact with each other. As a result, 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 via this resin material. In addition, since the bottom surface 7 of the container after welding has a slightly recessed central portion, the packaging container 1
The stability when mounting is secured.

[0005]

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 triangular flap portion is not formed. The pressing force applied to the sheet 3 most strongly acts on the standing tip 3a that comes into contact with the apex 19a of the flap contact surface 19. On the other hand, the welding of the triangular flap portion 3 and the bottom surface 7 of the container is mainly performed in the central portion A where they can come into contact with each other over a wide range. There is a risk that the welding force will be insufficient without being welded.

If it is attempted to avoid such an inconvenience by increasing the pressing force, the standing tip 3a of the triangular flap portion 3 will be avoided.
If the pressing force acting on the standing tip 3a is excessive and the content liquid remains at the standing tip 3a, the standing tip 3a may be broken by the internal pressure of the remaining content liquid. It has been difficult to ensure both sufficient welding force with the bottom surface 7 and prevention of breakage of the standing tip 3a.

The present invention has been made in order to solve such a conventional problem, and its object is to ensure a sufficient welding force between the triangular flap portion and the bottom surface of the container with a simple structure. Another object of the present invention is to provide a pressure welding device capable of achieving both prevention of tearing of the standing tip.

[0008]

According to a first aspect of the present invention, one surface of an unfinished packaging container filled with a content liquid and sealed at both ends of a tubular member is bent to face the one surface. And a pair of triangular flaps that are preliminarily bent at the intersecting corners, and press the pair of triangular flaps against the one surface to weld them via a welding medium. In the welding apparatus, the flap pressing portion is in surface contact with the standing base end side of the triangular flap portion excluding the vicinity of the standing tip, and is also in contact with the standing tip side of the triangular flap portion. It is characterized in that the abutting portion is a pair of inclined surfaces projecting forward from the base end side abutting portion that abuts against the standing base end side.

A second aspect of the present invention is the pressure welding apparatus according to the first aspect, wherein the flap pressing portion is a pressing front end portion of a pressing body which is pressed toward one surface of the packaging container. Is formed into a substantially trapezoidal shape that comes into surface contact with a trapezoidal portion of the triangular flap 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. It is characterized by having a pair of substantially trapezoidal container abutting surfaces that abut on the surface.

In the invention according to claim 1 or 2,
The triangular flap portion is pressed against one surface of the packaging container by the flap pressing portion to weld the triangular flap portion to the one surface.
Since the flap pressing portion has an inclined surface shape, one surface of the packaging container is deformed toward the pressing front and is dented, and the reaction force of the filled content liquid is increased due to the deformation, and the triangular flap portion and one surface are Becomes a close contact state, and the triangular flap portion 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 of the triangular flap portion excluding the vicinity of the standing tip, the tip side contact portion where the pressing force acts most strongly is the triangular flap portion. The central portion of the triangular flap portion, which is in wide contact with one surface, is pressed. That is, the pressing force can be applied most strongly to the central part where the triangular flap part and one surface are most desired to be in close contact with each other, without applying the pressing force to the vicinity of the standing tip of the triangular flap part.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a sectional view showing a pressure welding device according to an embodiment of the present invention, FIG. 2 is a perspective view of a heating device provided in a previous step of the pressure welding device of FIG. 1, and FIG. 4 is an enlarged perspective view of an essential part of the pressure welding apparatus of FIG. 4, FIG. 4 is a perspective view of the pressing body of FIG. 3, FIG. 5 is a sectional view showing a usage state of the pressure welding apparatus of FIG. 1, and FIG. Is.

As shown in FIG. 1, a pair of upper and lower triangular flap portions 3 and 5 (upper and lower portions) are provided in a divided and filled incomplete packaging container 1. Upper triangular flap part 3
Is erected from an intersection corner portion 10 of a container bottom surface 7 (an upper surface at the time of manufacturing the packaging container 1) as one surface and a container side surface 9 as both side surfaces, and a lower triangular flap portion 5 is a container upper surface 11 It is erected from an intersection corner 12 between the (bottom surface at the time of manufacturing the packaging container 1) and the container side surface 9.

The pressure welding device 31 includes a pressing member 33 for pressing the upper triangular flap part 3 against the container bottom surface 7, a pair of side pressing members 35 for pressing the lower triangular flap part 5 against the container side surface 9, and a pressing member. A pressure mechanism 37 for vertically moving the body 33 and substantially horizontally moving the side pressing body 35 is provided.

The pressurizing mechanism 37 includes a hydraulic cylinder 41 which is driven vertically by hydraulic power supplied from the hydraulic inflow portion 43, and a link member 49 which converts vertical driving of the hydraulic cylinder 41 into substantially horizontal driving. It has and. The pressing body 33 is connected to the hydraulic cylinder 41 via a pressure adjusting spring 47, and the pressure adjusting spring 4
The pressing force applied from the hydraulic cylinder 41 to the upper triangular flap portion 3 by 7 is adjusted to a desired pressure. The tip ends of the link members 49 are hydraulic cylinders 41.
The side pressing body 35 is fastened and fixed to the tip ends of the link members 49 so that the side pressing bodies 35 approach each other as they move downward and move away from each other as they move upward. Further, a return spring 45 for urging the hydraulic cylinder 41 upward is provided above the hydraulic cylinder 41.

A heating device 60 as shown in FIG. 2 is provided in the preceding step of the pressure welding device 31. Heating device 60
Is an upper hot air nozzle 61 arranged between the inner side surface of the upper triangular flap portion 3 of the packaging container 1 and the container bottom surface 7 which are sequentially and intermittently conveyed by the conveyor 51 at a constant pitch, and a lower triangular shape. The lower hot air nozzle 63 is provided between the inner surface of the flap portion 5 and the container side surface 9. Both hot-air nozzles 61 and 63 are wedge-shaped and extend for a predetermined length in the transport direction of the packaging container 1, and both hot-air nozzles 61 and 63 have a plurality of nozzle holes 63 and 65 through which hot air is blown. . The inside of each hot air nozzle 61, 63 communicates with the cylinder 69, and a hot air generator (not shown) is used to connect the cylinders 61, 63.
Hot air is supplied to the hot air nozzles 61 and 63 via the.
By the supply of such 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 lower contact portion between the triangular flap portion 5 and the container side surface 9 are separated. Be heated.

Above the conveyor 51, a pair of guide rails 53 are vertically extended. Upper and lower guide rails 5
3 abuts the upper or lower triangular flap portions 3 and 5, respectively, and bends the upper triangular flap portion 3 from the left and right sides of the container bottom surface 7 to the container bottom surface 7 side in advance by a predetermined angle, or the lower triangular flap portion 5 Preliminarily bend the container side surface 9 side by a predetermined angle.
As shown in FIG. 1, both the guide rails 53 and the conveyor 51 are extended to the pressure welding apparatus 1 in the next step, and the pressing body 33 and the side pressing body 35 interfere with the guide rail 53 at the time of pressing. A groove 55 for avoiding the above is formed. The packaging container 1 is sequentially and intermittently conveyed to the pressure welding apparatus 1 by the conveyor 51, and the guide rail 53 is also provided.
Thus, the upper and lower triangular flap portions 3 and 5 are kept bent at a predetermined angle.

As shown in FIG. 3, the outer circumference of the pressing front end portion 71 of the pressing body 33 is formed in a substantially rectangular shape slightly larger than the outer circumference of the container bottom surface 7. A pair of flap contact surfaces 73, which are flap pressing portions that contact the triangular flap portion 3, and a pair of container contact surfaces 75, which contact the container bottom surface 7, are provided.

As shown in FIG. 3 and FIG. 4, the flap contact surface 73 has a standing tip 3a of the upper triangular flap portion 3.
Of the trapezoidal portion excluding the vicinity of the upper surface of the triangular flap 3 and the tip-side abutting portion 7 that abuts on the standing tip 3a side of the upper triangular flap portion 3.
3a is a pair of substantially trapezoidal inclined surfaces that project forward from the base end side contact portion 73b that contacts the standing base end 3b side. The container abutting surface 75 is a pair of substantially trapezoidal inclined surfaces that are defined by the oblique sides of the pair of flap abutting surfaces 73 that face each other and abut on the container bottom surface 7. Pressing front end surface 77 of pressing body 33
Is a substantially rectangular flat surface defined by the pressing front ends of the flap contact surface 73 and the container contact surface 75.

Further, 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 pressing mechanism 37 by the bolt 25 inserted through the bolt insertion hole 79.

Next, the operation will be described.

To weld the upper and lower triangular flap portions 3 and 5, first, the substantially central surface of the contact portion between the upper triangular flap portion 3 and the bottom surface 7 of the container, the lower triangular flap portion 5 and the side surface 9 of the container are welded. 2 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 pressure welding apparatus 31 by the conveyor 51, and as shown in FIG.
3 to the container bottom surface 7 and the side pressing body 35 to the container side surface 9, respectively, so that the upper triangular flap portion 3 is moved to the container bottom surface 7 by the pressing body 33 and the lower triangular flap portion 5 is moved.
Are pressed against the container side surface 9 by the side pressing members 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 crossed corner portions 10 and 12 (see FIG. 1) which are bent in advance.

When the upper triangular flap part 3 is pressed, the flap contact surface 73 and the container contact surface 75 of the pressing body 33 are pressed.
Since both and are inclined surfaces, the central portion of the packaging bottom surface 7 is deformed forward by pressing and recessed, and the reaction force of the filled content liquid increases with such deformation, and the triangular flap portion 3 and the container bottom surface 7
And are in close contact. As a result, 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 via this resin material. Also,
Since the bottom surface 7 of the container after welding has a slightly recessed central portion, stability when the packaging container 1 is placed is ensured.

When the upper triangular flap portion 3 is pressed, the flap contact surface 73, as shown in FIG.
Since the triangular flap portion 3 comes into surface contact with the standing base end 3b side excluding the vicinity of the standing tip 3a, the tip side contact portion 73a on which the pressing force from the pressure mechanism 37 acts most strongly is the triangular flap. The central portion A of the triangular flap portion 3 where the portion 3 and the bottom surface of the container abut over a wide range is pressed.

Accordingly, the standing tip 3a of the triangular flap portion 3 is
Since the pressing force can be applied most strongly to the central portion where the triangular flap part 3 and the container bottom 7 are most closely contacted with each other without applying the pressing force to the vicinity of the upper part, It is possible to secure both a sufficient welding force between the container 3 and the bottom surface 7 of the container and to prevent the standing tip 3a of the triangular flap portion 3 from breaking due to the internal pressure of the remaining content liquid.

[0026]

As described above, according to the invention described in claim 1 or 2, the surface of the triangular flap and the one surface of the triangular flap are not affected by a pressing force in the vicinity of the tip of the triangular flap. Since it is possible to secure a sufficient pressing force at the central part of the triangular flap part where and touch in a wide range, it is possible to secure a sufficient welding force between the triangular flap part and the bottom surface of the container with a simple structure, and the standing tip. It is possible to achieve both prevention of tearing.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a pressure welding device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a heating device provided in a previous step of the pressure welding device of FIG.

FIG. 3 is an enlarged perspective view of a main part of the pressure welding device of FIG.

FIG. 4 is a perspective view of the pressing body of FIG.

5 is a cross-sectional view showing a usage state of the pressure welding apparatus of FIG.

FIG. 6 is an enlarged view of a main part showing a part of FIG. 5 in a cross section.

FIG. 7 is a perspective view showing a divided and filled packaging container.

FIG. 8 is an enlarged perspective view of a main part of a conventional pressure welding device.

FIG. 9 is a perspective view of a conventional pressing body.

FIG. 10 is a cross-sectional view showing a state of use of a conventional pressure welding apparatus in a partial cross section.

[Explanation of symbols]

 1 Packaging container 3 Triangular flap part 3a Triangular flap part standing tip 3b Triangular flap part standing base end 7 Container bottom surface (one surface) 9 Container side surfaces (both sides) 10 Crossing corners 33 Pressing body 71 Pressing body Front end portion 73 Flap contact surface (flap pressing portion) 75 Container contact surface

Claims (2)

[Claims] 1. An unfinished packaging container which is filled with a liquid content and which seals both ends of a tubular member, is erected from a crossing corner between one surface of an unfinished packaging container and both side surfaces which are bent and opposed from the one surface. In a pressing welding device having a flap pressing portion that presses a pair of triangular flap portions that are bent in advance at the intersection corner portion onto the one surface and welds the triangular flap portions through the welding medium, the flap pressing portion includes the triangular flap. Surface abutting on the standing base end side of the portion excluding the vicinity of the standing tip, and a tip side contact part that abuts the standing tip side of the triangular flap part abuts the standing base side. A press welding device comprising a pair of inclined surfaces projecting forward from the base end side contact portion. 2. The press welding device according to claim 1, wherein the flap pressing portion is provided with a triangular flap portion at a pressing front end portion of a pressing body which is pressed toward one surface of the packaging container. Of the trapezoidal portion except for the vicinity of the standing tip, the trapezoidal portion is formed into a substantially trapezoidal shape, and the pressing body is divided into opposite oblique sides of the pair of flap pressing portions, and the trapezoidal shape is in contact with the one surface. And a pair of container abutting surfaces.