JPH08301207A - Liquid paper container preheater - Google Patents

Abstract

(57) [Summary] [Purpose] In the process of making and filling a liquid paper container, such as a gable roof, that holds fruit juice, sake, water, etc. Provided is a preheating device for a liquid paper container, in which a thermoplastic resin layer on the surface is uniformly heat-melted in advance in order to facilitate thermocompression bonding. [Structure] The present invention comprises first and second heating boxes (10, 10) which are sequentially lowered and positioned in the vicinity of a portion (25) of a liquid paper container (20) which is thermocompression-bonded and sealed. On the surface of the first and second heating boxes (10, 10) facing the sealing portion (25), the first plurality of hot air blowing holes (b, b, b,
...) and the second large number of hot air blowing holes (c, c, c, ...) Are formed at different positions, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to thermocompression bonding such as the bottom or top of a temporarily folded liquid paper container in the box making and filling process for a liquid paper container such as a gable roof that stores fruit juice, sake or water. The present invention relates to a preheating device for a liquid paper container, which preliminarily heat-melts a thermoplastic resin layer on the surface in advance so as to facilitate thermocompression bonding of a sealed portion.

[0002]

2. Description of the Related Art Conventionally, in the process of making and filling a liquid paper container such as a gable roof made of a paper laminated material with a thermoplastic resin layer laminated on the surface, the provisionally folded liquid paper container is thermocompression-bonded and sealed. In order to facilitate the thermocompression bonding of the portion to be sealed, a preheating device is generally used in which the thermoplastic resin layer on the surface is melted in advance by blowing hot air to the sealed portion. Such a preheating device is equipped with a heating box which is moved and positioned in the vicinity of the portion of the liquid paper container which is thermocompression bonded and sealed. A large number of hot air blowing holes of about 1.5 mmφ are formed on the surface of the heating box which faces the sealed portion.

Conventionally, for a paper laminated material in which a thermoplastic resin layer is laminated on the surface of a gable roof type liquid paper container for containing fruit juice, sake, water, etc., for example, from the surface side, a thermoplastic resin layer is used. A polyethylene layer (30 μm), a paper material layer (310 g / m ² ), a polyethylene layer (25 μm), an aluminum foil (7 μm), a polyester film (PET, 12 μm), and a polyethylene layer (60 μm) that is a thermoplastic resin layer. Paper laminated materials and the like, which are appropriately laminated, are widely used. In addition, regarding the aluminum foil in the paper laminated material in which the thermoplastic resin layer is laminated on the surface of the liquid paper container described above, in order to improve the quality preservation of contents such as fruit juice, sake and water, It is laminated as a gas barrier layer that blocks oxygen and aroma components of the contents.

[0004]

Regarding the paper disposal material of the liquid paper container described above in relation to the recent problem of waste disposal related to the global environment, the above-mentioned aluminum foil is replaced with polyester film (PET). In recent years, a paper laminate material in which a gas barrier layer of a vapor deposition layer of an inorganic compound such as silicon oxide or magnesium oxide is laminated has been widely used as a paper laminate material that can be easily incinerated and recycled and can be recycled.

However, as compared with the conventional aluminum foil (7 μm), a film provided with a vapor deposition layer of an inorganic compound such as silicon oxide or magnesium oxide has poor thermal conductivity. For this reason, in the above-described conventional preheating apparatus for a liquid paper container having a large number of hot air blowing holes, as shown in FIG. 4, the hot air blowing holes (b, b, b) blow hot air. The thermoplastic resin layer (21) on the surface of the exposed part is partially melted by heat, and the part (41) or the pinhole (42) where the heat melting is defective is partially melted.
However, there is a problem such as foaming (43) and the like, and the thermocompression bonding failure occurs in the sealing portion (25), which causes liquid leakage of the liquid paper container.

That is, the recent polyester film (PET) described above is provided with a vapor deposition layer of an inorganic compound such as silicon oxide or magnesium oxide and is laminated as a gas barrier layer, which can be easily incinerated and recycled for recycling. In such a paper laminated material, since a laminated material with good thermal conductivity such as conventional aluminum foil is not laminated, as shown in FIG. 4, a large number of hot air blowing holes (b, b, b) are used for hot air blowing. The direction of the surface of the thermoplastic resin layer (21) on the surface where the
Due to poor heat conduction and diffusion (upward and downward in FIG. 4), the thermoplastic resin layer (21) on the surface blown with hot air is partially defective in heat melting (41) and pinholes (42). ) And foaming (43) were generated.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention, as shown in FIG. 1, FIG. 2 and FIG.
Made of paper laminated material with a thermoplastic resin layer (21) laminated on the surface,
With a preheating device that blows hot air to the part (25) that seals the bottom and top of the liquid paper container (20) such as a gable roof by thermocompression, and heats the thermoplastic resin layer (21) on the surface in advance. There
The liquid paper container (20) is provided with first and second heating boxes (10, 10) which are sequentially moved and positioned in the vicinity of the portion (25) to be sealed by thermocompression bonding. On the surface of the second heating box (10, 10) facing the sealing part (25),
The first large number of hot air blowing holes (b, b, b, ...) And the second large number of hot air blowing holes (c, c, c, ...) are formed at different positions. Regarding preheating device for liquid paper container,
By preheating the part (25) of the liquid paper container (20) to be thermocompression-bonded and sealed by such a preheating device, the thermoplastic resin layer (21) on the surface is uniformly heat-melted in advance, and the conventional aluminum Even if a component material with good thermal conductivity such as foil is not laminated, the partial defective points of heat fusion (41), pinholes (42), foaming (43), etc. shown in Fig. 4 occur. The present invention provides a preheating device for a liquid paper container that can prevent the above.

In the liquid paper container preheating device of the present invention, the first large number of hot air blowing holes (b, b, b, ...) And the second large number of hot air blowing holes (c, c, c, ...). More specifically, the positional relationship with the first hot air blow-out holes (b, b, b, ...)
The position facing the sealing part (25) and the position facing the sealing part (25) of the second plurality of hot air blowing holes (c, c, c, ...) are shown in FIG. 3, for example. As shown, the second hot-air blowing holes (c, c, c, ...) Are located at the longitudinal, horizontal, and diagonal intermediate positions of the adjacent first hot-air blowing holes (b, b, b, ...). To be located
The positions of the respective blowing holes of the first and second heating boxes (10, 10) are formed at different positions.

[0009]

In the liquid paper container preheating device of the present invention, the first heating box for moving and positioning the liquid paper container near the portion to be sealed by thermocompression bonding such as the bottom or top of the liquid paper container is provided. , The first plurality of hot air blowing holes (b, b, b) on the surface of the first heating box facing the sealing portion.
In addition to the same preheating device for the liquid paper container in which b, ...) is formed, a second heating box that is sequentially moved and positioned is provided, and the second heating box is sealed as described above. A second large number of hot air blowing holes (c,
c, c, ...) As shown in FIG. 3, for example, the second hot air is placed at an intermediate position between the adjacent first hot air outlets (b, b, b, ...) in the vertical, horizontal, and diagonal directions. Since the blowing holes (c, c, c, ...) Are formed so as to be located, the first plurality of hot air blowing holes (b, b,
In order to blow hot air from the second multiple hot air blowing holes (c, c, c,…) at the middle position of the vertical, horizontal, and diagonal positions where the hot air was blown from b,…) Since the same position is not doubly preheated, the thermoplasticity of the sealing part (25) is small even if the heat conduction and diffusion in the surface direction of the thermoplastic resin layer (21) on the surface are small. The resin layer (21) can be heat-melted uniformly in advance.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a sectional explanatory view of a preheating device for the top of a liquid paper container in an embodiment of the present invention. In the figure, the alternate long and short dash line indicates the portion (25) that is sealed by thermocompression bonding of the liquid paper container (20) located in the vicinity when the first or second heating box (10) descends. It is a thing.

The liquid paper container preheating device of this embodiment is provided with a spout (26) on the gable roof surface by temporarily folding the liquid paper container (20) such as a gable roof in the box making and filling process. , A gable roof type liquid paper container (20) filled with contents is sealed by thermocompression bonding the side surface and the bottom surface, and is intermittently conveyed in the front-rear direction of FIG. The support substrate (31) positioned at, the cylindrical hot air supply unit (32) fixedly attached to the support substrate (31), and the hot air supply unit (32) sliding airtightly to guide The outer cylinder body (34) mounted so as to rise and descend on the support substrate (31) via the cylinders (33, 33) and an air cylinder (not shown), and the outer cylinder body (34) at the lower part, When the 1st or 2nd heating box (10) descends, it should be positioned so as to be located in the vicinity of the part (25) to be sealed by thermocompression bonding of the liquid paper container (20). The three heating boxes (10-1, 10-) of the first (or second) shown in FIGS. 2 (A) and 2 (B), which have a perimeter and a hood (12) each having a hot air supply port (11). 2 and 10-3), and two sets of liquid paper container preheating devices having substantially the same structure, respectively.

FIG. 2A is a plan view of the first heating box 10 of the liquid paper container preheating device according to the embodiment of the present invention, and FIG. 2B shows the embodiment of the present invention. FIG. 3 is an end view of the first heating box (10) of the liquid paper container preheating device in the example, taken along line XX in FIG. 2 (A). In addition, the small arrows in the figure indicate that the first hot air blowing holes (b, b, b, ...)
It shows the direction in which hot air is blown, and the alternate long and short dash line in the figure shows the portion (25) of the gable roof type liquid paper container (20) which is thermocompression-bonded and sealed. FIG. 2
FIG. 2C is a side view of the first heating box 10 of the liquid paper container preheating device in the embodiment of the present invention, taken along the Y, Y plane of FIG. 2A.

The liquid paper container preheating device of the present embodiment is a box and filling process for a gable roof type liquid paper container (20) made of a paper laminated material having a thermoplastic resin layer (21) laminated on its surface. In order to facilitate thermocompression bonding of the provisionally folded liquid paper container (20) by thermocompression bonding and sealing (25), hot air is blown to the sealing part (25) to heat the surface beforehand. A preheating device for thermally melting the plastic resin layer (21), wherein the first and second heating boxes (10, 10) of the two sets of preheating devices for liquid paper containers shown in FIG. Sealing part of (25)
FIG. 3 (A) shows a first large number of hot air blowing holes (b, b, b, ...) And a second large number of hot air blowing holes (c, c, c, ...) As described above, in the adjacent first hot air blowing holes (b, b, b, ...),
The second hot air outlet (c, c, c, ...) is located at the middle position between the vertical and horizontal directions.
Are formed so that each of them is located.

That is, in the liquid paper container preheating device of this embodiment, as shown in FIG. 2A, the portion (25) of the temporarily folded liquid paper container (20) which is thermocompression-bonded and sealed, In accordance with the shape of the side surface of the deformed hexahedron, the thermoplastic resin layer (21) on the inner surface side of the sealing portion (25) is heat-melted, and the first heating box (10- 2) and the left and right outer side thermoplastic resin layers (21) of the sealing part (25) are heat-melted, and the left and right first heating boxes (1
0-1, 10-3) and, as shown in FIG. 2 (B), this side surface is located at the bottom of the first heating box (10-2) at the center of the deformed hexahedron. , Are arranged in a diagonal grid pattern shown in FIG. 2 (C) with a vertical interval of 3 mm × 4 rows and a horizontal interval of 6 mm on the entire circumference of the six surfaces facing the inner surface side of the sealing portion (25). ,
1.2mmφ continuous first large number of hot air outlets (b, b, b,
...), and the lower side of the first heating box (10-1, 10-3) on the left and right of which the side surface is pentahedron, the above-mentioned sealing portion (2
On the two convex surfaces facing the left and right outer surfaces of 5), the vertical spacing is 3 mm x 4 rows and the horizontal spacing is 6 mm. Is formed with a large number of hot air blowing holes (b, b, b, ...). It is preferable that the hot air blowout holes (b, b, b, ...) Have a shape in which the blowout side spreads radially so that the hot air does not diffuse and do not partially heat.

Further, in the liquid paper container preheating device of this embodiment, a second large number of hot air blowing holes (not shown) are provided.
As for (c, c, c, ...), as shown in FIG. 3 (A), at the intermediate position between the vertical and horizontal directions of the adjacent first hot air blowing holes (b, b, b, ...), The positions of the above-mentioned first large number of hot air blowing holes (b, b, b, ...) are set so that the second hot air blowing holes (c, c, c, ...) Are located at half pitches (3 mm) each. On the same surface of the second heating box (10-2) in the center and the second heating boxes (10-1, 10-3) on the left and right, which are not shown in the drawing, are horizontally displaced and the first large number of The same second continuous hot air outlets (b, b, b, ...) and the second left and right hot air outlets (b, b) that are the same as the hot air outlets (b, b, b, ...) , b, ...) are formed respectively.

Next, using the preheating device for the liquid paper container of this embodiment, from the surface side, a polyethylene layer (30 μm) which is a thermoplastic resin layer (21), a paper material layer (310 g / m ² ) and polyethylene were used. Layer (25 μm), polyester film (PET, 12 μm), vapor-deposited layer of silicon oxide (SiO ₂ ) (400 Å) and polyester film (PE
T, 12 μm) and the polyethylene layer (8) which is the thermoplastic resin layer (21).
(0 μm) is laminated appropriately and is made into a paper laminated material that is easy to incinerate and that can be recycled, and is attached to the part (25) to be sealed by thermocompression bonding of a gable roof liquid paper container (20). , 40 mmAq of hot air at 260 ° C. from the first large number of hot air blowing holes (b, b, b, ...) And the second large number of hot air blowing holes (c, c, c, ...) When the thermoplastic resin layer (21) on the surface was previously heat-melted by spraying for 0.5 seconds, the thermoplastic resin layer (21) on the surface was almost uniformly heat-melted, and the heat like a conventional aluminum foil was applied. Despite not stacking the constituent materials with good conductivity, the partial heat-melting failure part (41) shown in Fig. 4
Generation of pinholes (42) and foaming (43) was not observed. The thermoplastic resin layer (21) on this surface is uniformly heat-melted, and the sealing portion (25) is thermocompression-bonded and sealed,
Regarding the liquid paper container (20) manufactured in the gable roof form, no liquid leakage due to poor thermocompression bonding was observed.

[0017]

As described above, according to the operation and the embodiment, in the liquid paper container preheating device of the present invention, the liquid paper container is provided near the portion such as the bottom or the top of the liquid paper container which is thermocompression-bonded and sealed.
It is provided with first and second heating boxes which are sequentially moved and positioned, and the first large number of hot air blowing holes and the second hot air blowing holes are provided on the surface of the first and second heating boxes which faces the sealed portion.
Since the large number of hot air blowing holes of No. 1 are formed at different positions, the first large number of hot air blowing holes and the second large number of hot air blowing holes do not preheat the same position, and the surface is averaged. Since it is preheated, the surface thermoplastic resin layer can be almost uniformly heat-melted even if the heat conduction and diffusion in the surface direction of the surface thermoplastic resin layer are low. In the process of making and filling liquid paper containers such as gable roofs that contain water, water, etc., even if components with good thermal conductivity such as conventional aluminum foil are not laminated, It is possible to provide a preheating device for a liquid paper container that can prevent the occurrence of various defective points for heat melting, pinholes, foaming, and the like.

Further, in the liquid paper container preheating device of the present invention, a portion of the liquid paper container which is thermocompression-bonded and hermetically sealed,
Since the preheating is performed in two stages by the first large number of hot air blowing holes and the second large number of hot air blowing holes, the thermoplastic resin on the surface is different from the above-described conventional one-stage hot air blowing hole preheating device. The time for heat-melting the layers can be greatly shortened, and it can greatly contribute to the increase in production efficiency and speeding up of the box making and filling process of the liquid paper container such as a gable roof type.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of a preheating device for a liquid paper container according to an embodiment of the present invention.

FIG. 2 (A) is a plan view of a first heating box (10) of the liquid paper container preheating device according to the embodiment of the present invention, and FIG. 2 (B) is a plan view of FIG. It is an end view of the XX plane of A). In addition, FIG. 2C shows Y, Y of the first heating box 10 of the preheating device for the liquid paper container in the embodiment of the present invention.
It is a side view of a surface.

FIG. 3 (A) is a partial side view showing a state in which a first hot-air blowing hole and a second hot-air blowing hole are formed in the liquid paper container preheating device of the present invention. (B) is
It is a partial side view of another example of the present invention showing a state in which a first hot air blowout hole and a second hot air blowout hole are formed.

FIG. 4 is a partial cross-sectional view showing a state of a thermoplastic resin layer on a surface blown with hot air in a conventional preheating device for a liquid paper container.

[Explanation of symbols]

 10 ... Heating box 11 ... Hot air supply port 12 ... Outer peripheral hood 20 ... Liquid paper container 21 ... Thermoplastic resin layer 22 ... Gas barrier layer 23 ... Intermediate resin layer 24 ... Paper material layer 25 ... Sealing part 26 ... Spout plug 31 ... Support substrate 32 ... Hot air supply part 33 ... Guide cylinder 34 ... Outer cylinder 41 ... Poor heat melting part 42 ... Pinhole 43 ... Foaming b, c ... Hot air blowout hole

Claims (1)

[Claims] 1. A portion (25), such as a gable roof-shaped liquid paper container (20) made of a paper laminated material having a thermoplastic resin layer (21) laminated on the surface, which is thermocompression-bonded and hermetically sealed. A preheating device that blows hot air to heat the thermoplastic resin layer (21) on the surface in advance, and moves in the order near the part (25) to be sealed by thermocompression bonding of the liquid paper container (20). The first and second heating boxes (10, 10), which are located at the same position, and the sealing portion (2) of the first and second heating boxes (10, 10).
On the surface facing 5), the first large number of hot air blowing holes (b, b, b, ...) and the second large number of hot air blowing holes (c, c, c, ...) are placed at different positions. A preheating device for a liquid paper container characterized by being formed.