JP2002179049A - Paper container for beverage or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a crack from occurring in the vicinity of the center of a base on a bottom of a paper container and a content liquid from leaking by reducing a concentration of stress applied to a paper wrapping material at the corresponding region in contact with a side face. SOLUTION: The paper container is provided by forming a web-like wrapping material to be a tube and filling it with a content liquid, sealing both ends of the tube by lateral seals and cutting, and then folding seal flaps of the lateral seals of the tube to form a bottom face. Since the lateral seal on the bottom face of the paper container is twisted substantially by 180 degrees and interposed between the bottom face and the seal flap, even if a seal flap on a bottom is formed with the wrapping material folded, little stress concentration is applied to the paper wrapping material in the vicinity of the center of the base in contact with the side face of the container bottom face. Thus, no crack occurs on the region and the content liquid does not leak.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a paper container for beverages and the like.

[0002]

2. Description of the Related Art When a paper container for holding a beverage or the like is used in sports or outdoor activities, the content can be easily opened and the content liquid can be easily drunk. When the paper container is discarded after drinking, the paper container is folded and discarded for easy recycling by hand.

[0003]

However, due to the shape of the container, when forming the container, the bottom seal flap is folded and fixed to the bottom of the container by glue or thermocompression bonding. At this time, the horizontal seal is also folded at the same time between the bottom and the seal flap, so that a thickness corresponding to the double width of the horizontal seal is sandwiched near the center of the bottom where the bottom of the container is in contact with the side surface. Since considerable stress concentration occurs near the center of the bottom (inside of the container) in contact with the side surface, a crack is generated in the portion, and the content liquid may leak from the cracked portion.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a paper container for beverages or the like which can obtain safe quality without liquid leakage until a consumer uses the paper container.

[0005]

According to a first aspect of the present invention, a web-like packaging material is formed into a tube, filled with an inner solution, and both ends of the tube are sealed with a horizontal line seal and cut. In a paper container in which a bottom surface is formed by bending a seal flap of a horizontal line seal, the horizontal line seal is twisted substantially 180 degrees and is sandwiched between the bottom surface of the paper container and the seal flap. The paper container of the present invention can be provided. Accordingly, a state can be created in which the region where the horizontal line seal is sandwiched near the center of the bottom where the bottom surface of the container contacts the side surface can be significantly reduced. For this reason, since stress concentration hardly occurs near the center of the bottom where the bottom surface of the container is in contact with the side surface, cracks do not occur in that portion, and the content liquid does not leak.

[0006]

FIG. 1 is a perspective view of a paper container according to an embodiment of the present invention, as seen from the bottom of a paper container main body. FIG. 2 is an explanatory view of a step of forming a bottom portion of the embodiment of the present invention and a conventional paper container. FIG. 3 is a plan view showing a folding line formed on the web-shaped paper packaging material at a stage before the paper container of the embodiment of the present invention is formed. FIG. 4 is a schematic view of a filling machine for forming a paper container according to the embodiment of the present invention. FIG. 5 is a schematic view of a main part of a filling machine for forming a paper container according to the embodiment of the present invention. FIG. 7 is an external perspective view of an embodiment of the present invention and a conventional paper container.

[0007] In a filling machine for producing a packaging container filled with liquid food such as milk or soft drink, a web-like packaging material is continuously formed into a tube while being conveyed. Liquid food is to be filled. In the figure, reference numeral 11 denotes a packaging material, 30 denotes a sterile room disposed at a predetermined position of the filling machine, and the packaging material 11 is set on the filling machine in a state of a reel 12, and is fed by a feeding machine (not shown). And is conveyed in the form of a web in the filling machine. The wrapping material 11 is formed by cutting a wide base paper (not shown) at a plurality of positions in a vertical direction, and folds m1, m2, and m11 to m14 are formed in advance.

The packaging material 11 fed out by the feeder is guided by rollers R1 to R5 (not shown) and supplied to the aseptic chamber 30.
6, guided by R7, subsequently conveyed upward in the aseptic chamber 30, guided by rollers 32, conveyed diagonally upward, and sent to the air knife section 33. Subsequently, the packaging material 11 is conveyed obliquely upward in the air knife portion 33, during which the sterilizing agent and the like attached to the packaging material 11 are removed by hot air discharged from a nozzle (not shown).

The packaging material 11 discharged from the air knife section 33
Is sent to the first guide roller 34, guided by the first guide roller 34, conveyed downward, and sent to the second guide roller 35. After being guided by the second guide roller 35, the packaging material 11 is conveyed obliquely upward, sent to the third guide roller 36, and guided by the third guide roller 36. , Which is conveyed downward, gradually curved while being guided by a forming ring or the like (not shown) as a packaging tube forming means, formed into a tube, and sealed in a vertical direction by a vertical sealing device (not shown) to form a packaging tube. It will be 41.

Then, while the packaging tube 41 is conveyed downward, liquid food is supplied from above through the filling pipe 13 and is filled in the packaging tube 41. In addition,
The first to third guide rollers 34 to 36 are used for the packaging material 11.
Is disposed rotatably on the upstream side of the forming ring in the conveying direction of the first direction, and guides the packaging material 11.

[0011] Thereafter, the packaging tube 41 is placed in the sterile room 30.
And is sent to a horizontal sealing device (not shown), where it is sandwiched from both sides and sealed in the horizontal direction at predetermined intervals to form a horizontal sealing portion.
Subsequently, in the horizontal seal portion, the packaging material tube 41 is cut by a cutting device (not shown), and the prototype container 14 having a pillow shape, a bag shape, or the like is separated. Then, each prototype container 14 is formed into a predetermined shape along the preformed folds m1, m2, m11 to m14 by a molding device (not shown), and the packaging container 15 is completed.

Since the cross section of the packaging tube 41 has a substantially circular shape, it is difficult to position the packaging tube 41 while the packaging tube 41 is being transported. Therefore, when the packaging material tube 41 rotates, for example, by receiving a force from the forming ring, the overlap portion S2 shifts from a predetermined position. And
When the packaging container 15 is completed by forming the prototype container 14 into a predetermined shape while the overlap portion S2 is displaced from the predetermined position, the fold m
The position of 1, m2 does not match the actual position of the fold, and the appearance of the packaging container 15 deteriorates.

In view of the above, a CCD (not shown) serving as a light detecting unit is disposed near the exit of the packaging tube 41 from the sterile chamber 30 so as to face the packaging tube 41.
The overlap portion S2 is detected based on the sensor output of the first portion, and the first portion as a detection result of the overlap portion S2 is detected.
The first guide roller 34 based on the detection data of
Is moved in the conveying direction of the packaging material 11 in the air knife section 33.

That is, when the packaging material 11 is transported between the roller 32 and the first guide roller 34 and reaches the first guide roller 34, the transport surface of the packaging material 11 and the first guide roller 34 The direction in which one end of the roller 34 is moved is made parallel.

In this case, while the packaging material 11 is guided by the first guide roller 34, the first guide roller 3
The first guide roller 34 is moved axially on the surface of the first guide roller 34 in accordance with the amount by which one end of the first guide roller 4 has moved. That is, the packaging material 11 can be moved in a direction perpendicular to the transport direction. Therefore, since the positions of the edges 11a and 11b of the packaging material 11 that are curved by the forming ring change, the overlapping portion S2 can be moved, the position of the overlapping portion S2 is adjusted, and the overlapping portion S2 is moved. It can be put in place.

As a result, when the original container 14 is molded and the packaging container 15 is completed, the positions of the folds m1 and m2 formed in advance on the packaging material 11 match the actual fold positions. 15 can be improved in appearance.

Further, in order to adjust the position of the overlap portion S2, the paper guide is connected to the edges 11a, 1
Since it is not necessary to press against the edge 1b, the edges 11a and 11b of the packaging material 11 are not damaged.

Further, since the conveying surface of the packaging material 11 sent to the first guide roller 34 and the direction in which one end of the first guide roller 34 is moved are made parallel, the overlapping portion S2 is moved to a predetermined position. , The transport state of the packaging material 11 can be prevented from greatly changing.

Note that instead of moving one end of the first guide roller 34, one end of the second guide roller 35 is moved, or one end of the first and second guide rollers 34, 35 is moved mutually. You can also. When one end of the second guide roller 35 is moved, the packaging material 11 is transported between the first and second guide rollers 34 and 35 and reaches the second guide roller 35. And the direction in which one end of the second guide roller 35 is moved is set in parallel.

The paper container is completed by the above-described method. As shown in FIG. 1 and FIG. 7, the paper container main body 15 is, for example, a rectangular box type (brick pack type) formed of composite paper containing resin. In the manufacturing process of the paper container 15, after the contents are filled, the bottom seal flap sealed with the horizontal line is bent and fixed to the bottom surface 17 of the paper container body 15. At this time, as shown in FIG. 3, the paper container can be easily formed by the folding line formed on the packaging material in advance.

FIG. 6 is an explanatory view of a conventional paper container, and is a perspective view of the bottom of the paper container main body viewed from below. As shown in the figure, when forming the container, the horizontal line seal end SF1 is not twisted behind the bottom seal flap 20 but is folded around the bottom seal flap base SF7 and the container bottom surface 17 is folded.
Is fixed by glue or thermocompression bonding. At this time, the horizontal seal is also folded at the same time between the bottom and the seal flap, so that the thickness corresponding to the double width of the horizontal seal is sandwiched especially in the vicinity of the center of the bottom in contact with the side surface of the container bottom. Due to the principle of leverage, the closer the object is located near the center of the bottom where the bottom of the container is in contact with the side, the greater the concentration of stress occurs near the center of the bottom where the bottom of the container is in contact with the side. Therefore, from this fact, a crack may have occurred in the portion and the content liquid may leak.

Next, a description will be given of an embodiment of the present invention in which excessive stress is not concentrated on the inside of the paper container of the bottom seal flap base portion SF7 and cracks do not occur. As shown in FIG. 2, when forming the container of the embodiment of the present invention, the horizontal seal end S
F1 is twisted substantially 180 degrees behind the bottom seal flap 20 and folded around the bottom seal flap base SF7, and the bottom seal flap is fixed to the container bottom surface 17 by gluing or thermocompression bonding. At this time, as shown in step 3, the horizontal line seal end SF1 is twisted by substantially 180 degrees behind the bottom seal flap 20, so that stress concentration is likely to occur significantly at the bottom seal flap base SF7 (where the container bottom surface is the container side surface). Near the center of the bottom where it touches)
Furthermore, since the area itself of the region SF3 in which the double horizontal seal is sandwiched between the flaps 20 is reduced, stress concentration occurs near the center of the bottom (inside of the packaging material) in contact with the side surface of the bottom surface of the container. Since it does not occur, no crack occurs in the relevant portion, and the liquid content does not leak. Again,
The closer to the center of the bottom side SF7 where the bottom of the container is in contact with the side by the principle of leverage, the closer to the center or the larger the sandwiched, the more the bottom of the bottom seal flap 20 is formed by bending the bottom seal flap 20 to the side. Considerable stress concentration occurs near the center of the contacting bottom side SF7 (on the inner side of the packaging material). Therefore, from this fact, according to the present embodiment, no crack is generated in the relevant portion, and the content liquid does not leak.

The other horizontal line seal is folded at the upper part of the side surface and is fixed to the side surface of the container as an upper seal flap. The upper seal flap comes to the top surface because the seal flap comes to the side surface of the container. Since the lateral seal is bent at 90 degrees outside the seal flap, there is almost no stress concentration on the base of the upper seal flap.

As described above, according to the present invention, liquid leakage due to the formation of the bent seal flap at the bottom of the container is eliminated. In the embodiment, a rectangular parallelepiped paper container referred to as a so-called brick has been described as an example. A prismatic paper container having a rectangular top and bottom surface and an octagonal body, called prisma. Alternatively, a wedge-shaped paper container in which the bottom surface, called a wedge, is square and the top is a horizontal seal. It is applicable to paper containers of various shapes and does not exclude them from the present invention.

[0025]

As described above, according to the first aspect of the present invention, the web-like packaging material is formed into a tube, filled with the inner solution, and both ends of the tube are sealed with a horizontal line seal and cut. In a paper container in which a bottom surface is formed by bending a seal flap of a horizontal line seal of the tube, the horizontal line seal is twisted substantially 180 degrees and bent between the bottom surface of the paper container and the seal flap. For paper containers such as beverages to be made, even if the bottom seal flap is formed by folding the packaging material, stress concentration on the paper packaging material near the center of the bottom side in contact with the side surface of the container bottom surface is almost eliminated, A crack does not occur in the portion, and the content liquid does not leak from the crack portion. ADVANTAGE OF THE INVENTION This invention can provide the paper container of drinks etc. which can obtain safe quality without a liquid leak until a consumer uses a paper container.

[0026]

[Brief description of the drawings]

FIG. 1 is a perspective view of a paper container according to an embodiment of the present invention as viewed from the bottom of a paper container main body.

FIG. 2 is an explanatory view of a step of forming a bottom portion in the embodiment of the present invention and a conventional paper container.

FIG. 3 is a plan view showing a folding line formed on a web-shaped paper packaging material at a stage before a paper container according to an embodiment of the present invention is formed.

FIG. 4 is a schematic view of a filling machine for forming a paper container according to the embodiment of the present invention.

FIG. 5 is a schematic view of a main part of a filling machine for forming a paper container according to the embodiment of the present invention.

FIG. 6 is an explanatory view of a conventional paper container, and is a perspective view of the bottom of the paper container main body viewed from below.

FIG. 7 is an external perspective view of an embodiment of the present invention and a conventional paper container.

[0027]

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 packaging material 12 reel 13 filling pipe 14 prototype container 15 paper container 16 side surface 17 bottom surface 20 bottom seal flap 21 upper seal flap S1 horizontal seal portion SF1 horizontal seal end portion SF2 horizontal seal central portion SF3 horizontal seal portion is sandwiched doubly Area SF7 bottom seal flap base m3 bottom seal flap fold line m1 top seal flap fold line m11-14 vertical line fold

[0028]

Claims (1)

[Claims] 1. A web-shaped packaging material is formed into a tube, filled with an inner solution, and both ends of the tube are sealed with a horizontal line seal and cut. Further, a seal flap of a horizontal line seal at one end of the tube is bent to form a bottom surface. In the formed paper container, the horizontal line seal is twisted substantially 180 degrees and is sandwiched between the seal flap and the bottom surface when the seal flap is fixed to the bottom surface. container.