JPH0986505A - Hot air heater for sealing liquid paper containers - Google Patents

Abstract

(57) [PROBLEMS] To provide a hot-air heating device that stably heat-bonds an ear portion of a prismatic liquid paper container (flat top carton) having a flat head and a body side wall panel. SOLUTION: The hot air blowing plates 13 and 14 of a blowing chamber 12 are arranged to simultaneously heat a back surface of a body side wall panel facing a back surface of an ear 2 folded in a triangular shape.
The fine blowing nozzles 15 are opened above so as to form the same pattern as the triangular shape of the ears 2, and the total opening area of the nozzles 15 on the body side wall panel 1 side is made larger than the total opening area on the ears 2 side. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-air heating device for sealing that flatly molds the head of a liquid paper container having a prismatic shape and hermeticity.

[0002]

2. Description of the Related Art Unlike a gable top carton with a gable roof top, a prismatic liquid paper container with a flat head (referred to as a flat top carton) eliminates the roof inclination, and the top rib is a sealing seal. Then, the roof panels (referred to as ears), which are folded down to one side and folded in a triangular shape on both sides, are folded back to the body side wall panel side, and FIG. 3 shows a molding procedure for the head. . Generally, hot air is used to heat the seal portion required for the molding. That is, a method is used in which the thermoplastic resin layer on the outermost surface of the laminated material at the portion to be bonded by hot air is blown and melted, and immediately after that, the melted surfaces are bonded by pressure bonding. FIG. 4 is FIG.
Both ears 2 shown in (d) are folded back in the direction of the arrow and the side wall panel 1 is shown.
It is explanatory drawing of the conventional hot-air heating apparatus 30 for making it adhere | attach and to a state of FIG.3 (e). As shown in FIG. 4A, the hot air sent from the heating fan blows out from the blowing chamber 22 through the pipe 21 and simultaneously heats the side wall panel 1 of the liquid paper container 10 and the back surface of the ear 2. FIG. 4B is an enlarged side view and front view of the blowing chamber 22, in which the hot air is diffused and blown from the nozzle 23 in a substantially perpendicular direction. FIG. 4C shows another blowing nozzle 23, in which hot air is blown from the large-diameter nozzle 23 close to the blower pipe 21 at a substantially right angle. In the liquid paper container 10 heated in the state of FIG. 4A, in the next step, the top gastric seal part 3 is bent to one side, both ears 2 are folded back downward, and pressed from both sides to form a side wall. The panel 1 is thermocompression bonded by heating and melting surfaces.

[0003]

As shown in FIG. 3, at the end of the head forming of the liquid paper container 10, both ears 2 are folded back on the body side wall panel 1. The two ears 2 having a triangular shape are adhered to the surfaces of the side wall panels 1 facing each other by thermocompression bonding, but the ears 2 have a large bending resistance due to the overlapping seal portion 3 and the body is filled with the already cooled liquid. However, the temperature of the body side wall panel 1 surface to be bonded is lowered, and the heat capacity is larger than that of the ear portion 2 and it is more difficult to raise the temperature. All the conditions are met. Therefore, if the back surface 2'of the ear shown in FIG. 2 and the side wall panel surface 2 "facing it are not heated sufficiently uniformly, adhesion failure will occur and the ear will bounce off. If overheated, the thermoplastic resin on the outer surface The layer is not only oxidized due to oxidization but also has a problem of damaging the resin layer on the inner surface of the laminated material and causing liquid leakage.The present invention has been made in view of this problem, and has two ears. It is an object of the present invention to provide a heating device for heating the surfaces of the body side wall panels 1 facing each other so as to be sufficiently evenly heated and stably thermocompression-bonded.

[0004]

SUMMARY OF THE INVENTION The present invention, which has been made to solve the above-mentioned problems, comprises four body side wall panels.
Opposing folding roof panels connected to the upper ends of prismatic body parts are folded outward in a triangular shape along diagonal ruled lines, and the other pair of roof panels is folded inward to form the folded roof panel and the roof. The opposite faces of the ribs connected to the upper end of the panel are sealed together, and the folding roof panel and the roof panel are laid flat and folded, and both ends of the sealed ribs are folded together with the folding roof panel. A hot air heating device for sealing a liquid paper container having a flat roof folded back on the side wall panel, the hot air supplying means supplying hot air, and the hot air supplied from the hot air supplying means are folded into a triangular shape. Heat for simultaneously heating the rear surface of the folded roof panel and the body side wall panel surface which is folded back and faces the folded roof panel. A blowout chamber is provided, and the total area ratio of the openings of the blowout nozzles that blow a plurality of hot air formed on the blowout plate of the hot air blowout chamber is different. The hot air heating device for sealing a liquid paper container is characterized in that the total opening area of the blowing nozzle on the side wall panel surface side is larger, and the blowing plate is provided so as to be substantially orthogonal to the outside of the hot air blowing chamber. Is the gist.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in more detail with reference to the other drawings. FIG. 1 is an explanatory view of a hot air heating device for sealing a liquid paper container according to the present invention. As shown in FIG. 1, a hot air heating device 20 for molding a liquid paper container according to the present invention.
Is provided with a blowing chamber 12 connected to the tip of the blower pipe 11 symmetrically.
As shown in FIG. 1 (b), blow-off plates 13 and 14 are provided on the outer peripheral surface of the chamber so as to be substantially perpendicular to each other, and are fixed so as to face the body side wall panel 1 and the ear 2 of the liquid paper container, respectively. Has been done. FIG. 2 is a three-view drawing of the ears 2 of the liquid paper container 10 and the body side wall panel 1 in a heated state. The blowing plates 13 and 14 are formed with an isosceles triangular pattern which is the same as the triangular pattern of the back surface 2'of the ear to be adhered and the body side wall panel surface 2 "which it faces, as shown in FIG. Thus, the fine blowout nozzles 15 as shown in FIG. 1C are arranged.

As described above, by blowing hot air from the fine air outlets 15 in accordance with the pattern to be bonded, the part to be bonded can be uniformly sprayed at an appropriate temperature. It is possible to prevent variations in temperature in the bonded portion, and as a result, it is possible to solve problems such as peeling of the ears 2 due to defective bonding and liquid leakage due to excessive damage to the laminated material in the heated portion. In many cases, the liquid paper container 10 is already filled with the internal solution at a low temperature, and the surface temperature of the body side wall panel 1 is lower than the back surface of the ear 2. Even if the temperature is the same, there is a difference in heat capacity between the two. Therefore, the total area of the blowout nozzle openings on the side wall panel 1 side of the body is made larger than the total area of the blowout nozzle openings on the ear 2 side, and the amounts of hot air are differentiated, so that both sides are thermally fused at the optimum temperature. be able to. The preferable total area ratio of the openings of the both blowing nozzles is 1 to 5, preferably 1.1 to 3, and more preferably 1.5 to 2. As shown in the upper part of FIG. 1C, the number of nozzles 15 may be the same and the diameter of the holes may be changed, as shown in the upper part of FIG. 1C. As shown in the lower part of (c), the hole diameter may be the same and the number of nozzles 15 may be changed.
The hot air heating device 20 for sealing a liquid paper container according to the present invention is shown in FIG. 1 for a liquid paper container 10 that is intermittently transferred.
It acts in the positional relationship of (a), and the distance between the chamber 12 and the surface to be heated is accurately maintained by a carton basket, an upper guide plate and the like (not shown). Further, since the hot air blown out from the fine blowout nozzles 15 of the blowout plates 13 and 14 travels substantially straight, it is possible to accurately and repeatedly perform heating according to the arrangement pattern of the nozzles. Further, since the area exposed to the temperature suitable for heat fusion is surely wider than the area by the conventional heating device 30, even if the intermittent stop position of the liquid paper container is a little misaligned in the flow direction, both It does not affect the work of bonding the ears 2.

The base material of the liquid paper container 10 according to the present invention includes:
For example, a laminated material having a layered structure centered on a paperboard and sequentially laminated from the outside as follows is used. 1) PE / paperboard / PE 2) PE / paperboard / PE / AL / PE 3) PE / paperboard / PE / VM-PET / PE where PE: low density polyethylene AL: aluminum foil VM-PET: aluminum or silicon oxide Evaporated polyethylene terephthalate film PE replaces low-density polyethylene with linear low-density polyethylene, medium-density polyethylene, polypropylene, ionomer, ethylene-vinyl acetate copolymer, ethylene
Acrylic acid copolymer, ethylene / acrylic acid ester,
It can be appropriately selected from ethylene / vinyl alcohol copolymer and the like.

In the case of contents having high permeability such as liquid detergent and alcohol solution, it is necessary to fold the end portion of the blank inside the carton so that the content liquid does not come into direct contact with the blank end face. The printing process is performed by flexographic printing, offset printing, gravure printing, etc. on the outermost surface of the laminated material, as is done for conventional liquid paper containers such as milk cartons. It is preferable not to provide a printing layer.

[0009]

EXAMPLE A hot air heater for sealing a liquid paper container according to the present invention has a size of height 160 mm, width 85 mm, depth 8
It was applied to a liquid paper container for motor oil having a volume of 5 mm and an internal volume of 1000 ml. For the base material, a laminated material having the following constitution was used from the outside. The total basis weight is 400
It was g / m ² . Printing ink layer / polyethylene 30μ
m / bleached kraft paper (280 g / m ² ) / polyethylene 2
0 μm / Silica oxide vapor-deposited polyethylene terephthalate film 12 μm / Linear low-density polyethylene 60 μm A blank consisting of a laminated material of at least the above is subjected to the same end face treatment as in the conventional method, pipe-bonded with a sucking machine, and then supplied to a molding filler for motor oil Then, molding, filling, and top sealing are performed, and in the last step, the bonding surfaces of the ears 2 and the body side wall panel 1 are heated by the heating device according to the present invention, and both ears 2 are immediately crimped from both sides with a pressure rod. . The pattern formed by the nozzles of the blowing plates 13 and 14 of the heating device is approximately the same size as the ear 2 to be adhered, the bottom side is 78 mm, and the height is 3
The shape was an isosceles triangle of 8 mm. Also, the blowing plate 1
The total opening area of the blowing nozzles 15 above 3 and 14 was changed by the following two methods, and the total opening area ratio of both was set to 1.69 and 1.50. When changing the hole diameter with the same number of nozzles Nozzle number 15 Hole diameter Ear blowing plate 1.0 mmφ Body side wall panel blowing plate 1.3 mmφ Total opening area ratio 1.69 When changing the number of nozzles with the same hole diameter Hole diameter 1.3 mmφ Number of nozzles Blowout plate for ear 10 Blowout plate for body side wall panel 15 Total opening area ratio 1.50 Further, the distance between the blowout plate 14 and the body side wall panel 1 is about 7 mm, and the distance between the blowout plate 13 and the back of the ear is also about 7 mm.
And Further, hot air of 300 ° C. was blown out from the blowing nozzle 15 at an air pressure of 60 mmAq and heated for 3 seconds. As a result of heating under the above conditions, charring and insufficient melting due to excessive heating were not observed, peeling of the bonded portion was eliminated, and bonding of the ear portion to the body side wall panel was extremely stable. In addition, excessive hot air was not squeezed out from other than the bonded portion, the gloss of the body side wall panel surface around the fixed ear portion was not lost, and the appearance was not impaired.

[0010]

According to the present invention, the heat fusion between the ears of the flat top carton and the surface of the side wall panel facing the body is uniformly heated at a necessary and sufficient temperature according to the pattern to be bonded. By doing so, it is possible to perform stable operation without peeling off the ears or damage to the laminated material due to excessive heating, and further without damaging the appearance, reducing the quality defects of the liquid paper container and improving the work efficiency of the molding and filling machine. Demonstrate.

[Brief description of drawings]

FIG. 1 is an explanatory view of a hot air heating device for sealing a liquid paper container according to the present invention.

FIG. 2 is a three-view drawing of a heated state of an ear portion and a body side wall panel of a liquid paper container.

FIG. 3 Explanatory drawing of liquid head molding

FIG. 4 is an explanatory view of a conventional hot air heating device for sealing a liquid paper container.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body side wall panel 2 Ear 2'Back of ear 2 "Body side wall panel surface where ears are opposed 3 Palm seal section 10 Liquid paper container 11 Blower pipe 12 Blower chamber 13, 14 Blowout plate 15 Blowout nozzle 20 Liquid according to the present invention Hot air heating device for paper container sealing 21 Blower pipe 22 Air blowing chamber 23 Nozzle 30 Conventional hot air heating device for liquid paper container sealing

Claims (2)

[Claims] 1. Folding roof panels facing each other connected to the upper end of a quadrangular prism-shaped body composed of four body side wall panels are each folded outward along a diagonal ruled line in a triangular shape, and the other pair is joined. Bending the roof panel inwardly, sealing the folded roof panel and the opposite faces of the ribs connected respectively to the upper ends of the roof panels together, and laying them flat on the folded roof panel and the roof panel. A hot air supply device for sealing a liquid paper container having a flat roof formed by folding back both ends of the sealed rib together with the roof panel on the body side wall panel, and a hot air supply means for supplying hot air, With the hot air supplied from the hot air supply means, the rear surface of the folded roof panel folded in a triangular shape and the folded roof panel are folded back and face each other. And a hot air blowing chamber that simultaneously heats the body side wall panel surface, wherein the total opening area ratios of the blowing nozzles that blow out a plurality of hot air formed on the blowing plate of the hot air blowing chamber are different, and the folding roof A hot-air heating device for sealing a liquid paper container, wherein the total area of openings of the blowing nozzles on the body side wall panel surface side is larger than the total area of openings of the blowing nozzles to the back surface of the panel. 2. The hot air heating device for sealing a liquid paper container according to claim 1, wherein the air blowing plate is provided so as to be substantially orthogonal to the outside of the hot air blowing chamber.