JPH11292005A - Heating method for gable roof paper container and heating device using the heating method - Google Patents

Abstract

(57) Abstract: A heating method and a heating method that do not generate pinholes when forming the top and bottom of a gable roof paper container made of a paper laminated material that does not contain metal foil and has a thermoplastic resin layer laminated on the surface. Providing equipment. [MEANS FOR SOLVING PROBLEMS] When the hot air blowing range is on a top portion (17),
A horizontal fold at the center of each of the panels 11, 12, 13, 14 at a portion inside the horizontal fold line e of the upper attaching portion 16 which is continuously provided via a horizontal fold line e above the top. Limited to the portion excluding the vicinity near the line e, and in the bottom 19,
A central position of each of the panels 11, 12, 13, and 14 at an inner portion on the horizontal fold line h and an extension thereof of the lower sticking portion 20 which is continuously provided through a horizontal fold line h below the bottom. Then, hot air is blown to heat the thermoplastic resin layer, respectively, only at the portions excluding the horizontal fold line h and the vicinity near the extension thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for heating the top and bottom of a gabled roof paper container for storing fruit juice, sake and the like, and a heating apparatus using the heating method. The present invention relates to a heating method for sealing a top and bottom of a temporarily folded paper container by thermocompression bonding in a box making and filling process of a gable roof paper container having the above configuration, and a heating device using the heating method.

[0002]

2. Description of the Related Art Conventionally, as a paper laminate material in which thermoplastic resin layers constituting a paper container such as a gabled roof type for storing fruit juice, sake and the like are laminated, for example, [outside of the container] polyethylene (PE) / paperboard / PE / aluminum foil (Al) / polyethylene terephthalate (PET) / PE [inside of container]
Laminated materials such as constructions are widely used.

In view of recent environmental problems and energy saving, it is necessary to improve the difficulty in recycling and disposing of empty boxes after use and to solve the problem of large power consumption during the production of Al. An inorganic compound vapor-deposited thin film using a thermoplastic resin film as a support film instead of Al for the barrier layer is used. For example, a laminated material such as [outer container] PE / paperboard / PE / PET / silicon oxide vapor-deposited thin film / PE [inside container] is also used.

On the other hand, a gable roof type paper container box made of a paper laminated material having a thermoplastic resin layer laminated on such a surface,
In the filling step, hot air is blown by a heating oven provided in a heating device that is moved to and located near the sealed portion in order to facilitate thermocompression bonding of the sealed portion at the top or bottom of the temporarily folded paper container. In this process, the thermoplastic resin layer on the surface is melted, and the parts to be hermetically sealed are bonded and bonded.

FIG. 2 is a development explanatory view of the gable roof paper container.
Horizontally, five rectangular back panel 11, left side panel 12, front panel 13, right side panel 14, and glue allowance panel 15 are sequentially arranged in parallel via four vertical fold lines a, b, c, and d. The five panels are further provided with an upper sticking portion 16, a top portion 17, a wall portion 18, and a bottom portion 19 via three horizontal fold lines e, f, g in the vertical direction. The lower sticking portion 20 is provided on the bottom of the left and right side panels and the front panel via a horizontal fold line h and two vertical fold lines i and j. A vertical fold line k, l is provided at the center of the upper sticking portion of the panel, and a ridge line connecting the left and right corners at the lower end of the top is set as a bottom at the top of the left and right side panels for folding. Intersects the lower end of the vertical fold line k, l of the upper sticking part in an isosceles triangle Because a two fold lines m and n, o
Are provided at the bottom of the left and right side panels, and a vertical fold line i of the lower sticking portion is formed in an isosceles triangle with a ridge connecting the left and right corners at the upper end of the bottom at the bottom.
two oblique fold lines q and r, s and t that intersect the upper end of j
Is provided.

An example of a method of sealing the top of a gabled roof paper container is as follows. First, each panel is bent along vertical fold lines a, b, c, and d, and the outside of the glue allowance panel 15 is removed using a frame sealer or the like. The side surface and the inner surface of the back panel 11 are overlapped and thermally fused to produce a paper container sleeve 21 (see FIG. 3A). Then, as shown in FIGS. 3 (a) and 3 (b), the sealing portion of the upper sticking portion of the paper container sleeve (the upper sticking portions of the front panel and the back panel, 11a, 13
a) (parts to be attached on the left and right side panels, 1
2a, 14a), hot air is blown from the inner and outer surfaces to melt the thermoplastic resin layer on the surface, and the fold lines k, m, n and l, o,
Folded inward through p, folded along the fold line and bonded 12a, 14a and sealed 11
The top of the paper container is formed by joining and sealing a and 13a (the formation of the bottom of the paper container is the same as the formation of the top portion, so the description is omitted here).

Here, in order to melt the surface of the thermoplastic resin layer of the paper container sleeve 21, the heating oven 1 of the heating device 10 as shown in FIGS. This is performed by blowing hot air from inside and outside from the heating oven 1 toward the bonded portion and the sealed portion of the paper container.

More specifically, as shown in FIGS. 4A and 4B, the heating oven 1 has a structure in which side ovens 1B and 1B are provided with grooves 2 on both sides of a center oven 1A. And side oven 1B, 1
A large number of hot air blow-out holes 3, 3,... When the heating device descends and the top of the paper container sleeve is inserted into the groove 2, the hot air blowing holes 3, 3
.. Are blown toward the top to melt the thermoplastic resin layer on the surface of the paper container sleeve and seal the upper sticking portion 16.

On the top side, the hot air flows to the portion completely entering the top 17 from the fold line e, that is, the intersection of the fold lines k, m, n of the left side panel 12 and the fold of the right side panel 14. The sprayed surface PE was melted up to the portion where the intersections of the lines l, o, and p were completely included.

On the bottom side, the fold line h extends completely into the bottom 19, that is, the intersection of the fold lines i, q, r of the left side panel 12 and the fold line j of the right side panel 14. , S, t, the thermoplastic resin layer on the sprayed surface was melted up to the portion containing the intersection (see FIG. 5, hatched portion).

[0011]

As described above, at the top of the paper container sleeve, the hot air blowing point extends from the entire upper sticking portion 16 over the horizontal fold line e to above the top 17. (That is, the intersection of the fold lines k, m, n of the left side panel 12 and the intersection of the fold lines 1, o, p of the right side panel 14 are blown with hot air to melt the thermoplastic resin layer on the surface.) Therefore, when the top panel 17 is formed by folding the left and right side panels along each fold line and sealing the back panel 11 and the front panel 13 under pressure to form the top portion 17, PET or the like is formed near the intersection of the above four fold lines. In some cases, the thermoplastic resin layer was damaged and the sealing property was impaired.

Further, even at the bottom of the paper container, the hot air blowing point crosses the horizontal fold line h existing at the boundary between the lower sticking portion 20 and the bottom 19 and reaches the lower portion of the bottom 19 (that is, the bottom). Hot air is blown to the intersection of the fold lines i, q, r of the left side panel 12 and the intersection of the fold lines j, s, t of the right side panel 14 to melt the PE on the surface. When the bottom portion is folded and sealed along, the thermoplastic resin layer such as PET may be damaged near the intersection of the four fold lines, and the sealing property may be impaired.

According to the present invention, a hot air is blown onto the inner and outer layer surfaces of a gable roof type paper container having a thermoplastic resin layer such as PE laminated on the surface and made of a paper laminated material not containing a metal foil such as an aluminum foil. It is made by paying attention to the above problems that occur when forming by folding and sealing the top and bottom parts, and a metal foil such as an aluminum foil having a thermoplastic resin layer such as PE laminated on the surface. It is an object of the present invention to provide a heating method that does not generate pinholes or the like when forming the top or bottom of a gabled roof paper container made of a paper laminated material that does not contain the same, and a heating apparatus using the heating method.

[0014]

Means for Solving the Problems A first invention of the present invention is:
It is made of paper laminated material that does not contain metal foil such as aluminum foil with a thermoplastic resin layer laminated on the surface, and the upper sticking part, top part,
Wall, bottom, the edge of the temporarily folded top and bottom of the gabled roof paper container composed of the lower sticking part is applied to the groove of the heating oven provided with a groove surrounding from inside and outside, and the heating oven A method of injecting hot air from a large number of small holes provided facing the groove onto the inner and outer surfaces of the top and bottom of the paper container, and heating the thermoplastic resin layer previously formed on the top and bottom of the paper container with the heat. In the case where the hot air blowing range is at the top, the upper sticking portion that is continuously provided above the top via a horizontal fold line is a portion inside the horizontal fold line, at the center position of each panel. The horizontal fold line is limited to the portion excluding the vicinity of the horizontal fold line, and at the bottom, the horizontal fold line and the horizontal fold line of the lower sticking portion that is connected through the horizontal fold line below the bottom The inner part on the extension line, the horizontal fold line at the center of each panel and Is limited to the portion excluding the extension on close proximity of a heating method of the gable roof paper container, characterized in that each heating the thermoplastic resin layer blowing hot air.

According to a second aspect of the present invention, an upper sticking portion, a top portion,
Applying the edge of the temporarily folded top or bottom of the gable roof paper container composed of a wall, a bottom, and a lower sticking portion to a groove of a heating oven provided with a groove surrounding the inside and outside, the heating oven Hot air is sprayed onto the inner and outer surfaces of the top and bottom of the paper container from a number of small holes provided facing the groove of the paper container, and the heat heats the thermoplastic resin layer previously formed on the top and bottom of the paper container. In the heating oven device, when the blowing range of the hot air is at the top, the upper sticking portion that is continuously provided above the top via a horizontal fold line is a portion inside each horizontal fold line, and Limited to the part except the vicinity of the horizontal fold line near the center position, and in the bottom part, of the lower sticking part which is continuously provided via the horizontal fold line below the bottom part,
Heating the thermoplastic resin layer by blowing hot air on the horizontal fold line and its inner part on the extension, excluding the part near the horizontal fold line at the center position of each panel and the vicinity near the extension. A heating device for a gabled roof paper container characterized by having such a configuration.

[0016]

As described above, according to the present invention, when the hot air blowing range is at the top, the horizontal fold line of the upper sticking portion continuously provided above the top via the horizontal fold line is removed. In the inner portion, except for the portion near the horizontal fold line at the center position of each panel, and at the bottom, the lower sticking portion that is continuously provided below the bottom via the horizontal fold line The inner part of the horizontal fold line and its extension is limited to the horizontal fold line at the center position of each panel and the part excluding the part near the extension line. Even if the top and bottom are formed into a folded paper container, the plastic film of the paper laminate material is not damaged.

Further, if a paper container is formed by using a heating device using such a heating method, a paper container having a completely sealed top and bottom can be obtained.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments. FIG. 1 is an explanatory view in which a paper container sleeve heated by the above-mentioned heating oven by using the heating method of the present invention is developed in a blank shape, and FIG. 4 is a schematic view of (a) of a top heating oven in a heating device. It is explanatory drawing, (b) is a bottom view seen from the AA 'line in (a).

The main body of the gable roof type paper container heating device 10 according to the present invention, which is not shown, is an outer cylindrical body which is mounted so as to ascend and descend via a support base, a hot air supply section, a guide cylinder and an air cylinder. The heating oven 1 is attached to the lower part of the outer cylinder. Then, as shown in FIG. 4 (a), when the heating oven 1 is lowered, the tops 17 of the temporarily folded paper container sleeve 21 are thermocompression-bonded to the portions 11a, 13a for sealing and the portions 12a, 14a to be bonded. The structure is such that it is located in the vicinity.

In the heating oven 1 according to the present invention, the side ovens 1B and 1B have grooves 2 on both sides of the center oven 1A.
And a portion 1 bonded to the temporarily folded sealing portions 11a and 13a of the paper container sleeve 21.
2a and 14a can be located at appropriate intervals. Center oven 1A and side oven 1
A large number of hot air blowing holes 3 are provided on the side surfaces of the grooves B and 1B.
Are provided in parallel in a plurality of stages in the horizontal direction. When the outer cylinder of the heating device is lowered and the top of the paper container sleeve is inserted into the groove 2, the hot air blowing holes 3, 3
.. Are blown toward the top to melt the thermoplastic resin layer on the surface of the paper container sleeve, thereby sealing the upper sticking portion 16. Arrows indicate the direction in which the hot air is blown from the hot air blowing holes.

At this time, the portion where the hot air blows and melts the thermoplastic resin layer of the paper container sleeve is connected to the horizontal fold line of the upper sticking portion 16 which is continuously provided above the top portion 17 via the horizontal fold line e. e is a portion inside of each panel 11, 1
It is important to exclude the portion near the horizontal fold line e at the center position of 2, 13, and 14 (see FIG. 1, hatched portion).

Similarly, at the bottom portion, the lower sticking portion 2 continuously provided below the bottom portion 19 via a horizontal fold line h.
0, the inner portion on the horizontal fold line h and its extension, and the portion excluding the horizontal fold line h at the center position of each of the panels 11, 12, 13, and 14 and the vicinity on the extension thereof. This is important (see FIG. 1, shaded area).

The gable roof paper container used in this embodiment was made of a laminated material having the following structure. That is, [outside of the container] PE (20 μm
Thickness) / paperboard (basis weight 310 g / m ² ) / PE (15 μm
Thickness) / PET (12 μm thick) / Silicon oxide evaporated thin film (6
00Å) / PE (60 μm thick) [inside of container].

The top and bottom of the roof-shaped paper container thus sealed were cut out, and the degree of pinhole occurrence was checked with a pinhole check solution. There were no holes.

[0025]

As described above, according to the present invention, by removing heating to unnecessary portions, a laminated material comprising a paper and a thermoplastic resin, which does not use a metal foil such as an aluminum foil having poor heat conductivity, is used. In this case, stable paper container molding can be realized even when the above method is used (this is not necessary for a laminated material using a material having good heat conductivity such as aluminum foil). In addition, by forming a paper container using a heating device using such a heating method, it is possible to form a stable paper container having extremely good sealing performance, and it is also possible to save energy by removing excess heat. .

[Brief description of the drawings]

FIG. 1 is an explanatory view in which a paper container sleeve heated by a heating method according to the present invention is developed in a blank shape.

FIG. 2 is a development explanatory view of the gable roof paper container according to the present invention.

FIG. 3A is an explanatory diagram of a sleeve state of a gable roof paper container according to the present invention, and FIG. 3B is an explanatory diagram of a paper container in which a sleeve is formed.

FIG. 4 (a) of the top heating oven in the heating device
Is a schematic explanatory view, and (b) is AA ′ in (a).
It is the bottom view seen from the line.

FIG. 5 is an explanatory view in which a paper container sleeve heated by a conventional heating method is developed in a blank shape.

[Description of Signs] 1 Heating oven 1A Center oven 1B Side oven 2 Groove 3 Hot air blow-out hole 10 Heating device 11 Back panel 11a, 13a Sealing part 12 Left side Front panel 12a, 14a {Folding and bonding part 13} Front panel 14} Right side panel 15} Glue margin panel 16} Top sticking part 17 # Top 18 # Wall 19 # Bottom 20 # {Lower sticking part 21} Paper container sleeve a, b, c, d, e, f, g, h, i, j, j, k,
l, m, n, o, p, q, r, s, t ‥‥ fold line

Claims (2)

[Claims] 1. A gable comprising a paper laminated material which does not contain a metal foil such as an aluminum foil having a thermoplastic resin layer laminated on a surface thereof, and which comprises an upper sticking portion, a top portion, a wall portion, a bottom portion, and a lower sticking portion. The edge of the temporarily folded top or bottom of the roof paper container is applied to a groove of a heating oven provided with a groove surrounding the inside and outside, and hot air is supplied from a number of small holes provided facing the groove of the heating oven. In the method of injecting into the inner and outer surfaces of the top and bottom of the paper container and heating the thermoplastic resin layer previously formed on the top and bottom of the paper container with the heat, when the blowing range of the hot air is on the top, Of the upper sticking part, which is continuously connected via a horizontal fold line above, is limited to the part except for the vicinity of the horizontal fold line near the center position of each panel at the center position of each panel , And at the bottom, a horizontal fold below the bottom The inner part on the horizontal fold line and its extension line of the lower sticking part connected continuously through the line, limited to the part except the horizontal fold line at the center position of each panel and the vicinity near the extension line And then heating the thermoplastic resin layer by blowing hot air, respectively. 2. A groove which surrounds the edges of the temporarily folded top and bottom of the gabled roof paper container composed of the upper adhesive part, the top part, the wall part, the bottom part and the lower adhesive part from inside and outside. Hot air is blown onto the inner and outer surfaces of the top and bottom of the paper container from a number of small holes provided facing the groove of the heating oven, and the heat is applied to the top and bottom of the paper container. In a heating oven device for heating a thermoplastic resin layer that is formed in advance, when the range of hot air blowing is at the top, the horizontal direction of the upper sticking portion that is continuously provided via a horizontal fold line above the top is Limited to the part inside the horizontal fold line near the horizontal fold line at the center position of each panel, and at the bottom, it is connected through a horizontal fold line below the bottom. The inner part of the lower sticking part to be installed, on the horizontal fold line and its extension The gable roof pattern paper is characterized in that hot air is blown to heat the thermoplastic resin layer, respectively, to a portion except for a portion near a horizontal fold line at a center position of each panel and an extension of the panel in minutes. Container heating device.