JP2000313077A - Heater block for heating carton for paper vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heater block for heating a carton for a paper vessel by which the whole inside sealing face can be sufficiently softened to a degree necessary for complete heating seal and seal with high sealing properties is obtained and leak of the contents is prevented. SOLUTION: A carton for a paper vessel is formed by punching the base material of a paper board in which the surface and the rear are covered with thermoplastic resin, into a developing shape of the paper vessel and performing side sealing. Four faces of an opened bottom part or a top part of the carton for the paper vessel or an inside sealing face is heated on a filling machine by the heater block heating the carton for the paper vessel. This heater block is equipped with a hollow box-shaped block body 2 which is inserted to the bottom part or the top part and heats the part excepting four corners of the inside sealing face by hot air and with four corner blocks 4-7 which are inserted to the bottom part or the top part and heat four corners mainly of the inside sealing face by hot air. Since four corners of the inside sealing face are heated mainly and independently by hot air blown out of the respective corner blocks, four corners are heated sufficiently and the whole inside sealing face is sufficiently softened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container used for heating an opened bottom or top inside sealing surface of a semi-finished carton of a paper container for storing liquid beverages such as milk and juice on a filling machine. The present invention relates to a heating block for heating a carton.

[0002]

2. Description of the Related Art FIG.
In order to manufacture the paper container 20 for a liquid beverage as shown in
After performing a predetermined printing on a paperboard base material coated with a thermoplastic resin such as polyethylene on the entire front and back surfaces by a packaging material maker, the paperboard base material is placed on a square tubular body 22 having a flat bottom 21. The paper container 20 having the gable roof type top 23 is punched into a developed shape, and is subjected to a folding line process and the like to perform a side seal. The resulting semi-finished carton 24 for paper containers as shown in FIG. 3 is folded and shipped to milk beverage manufacturers, food manufacturers and the like. In these manufacturers, the carton 24 for the paper container is fed into the forming section of the filling machine, and the inner and outer sealing surfaces of the four panels 25 to 28 forming the bottom 21 are heated by the bottom heater, and then the sealing surfaces are brought into close contact with each other. Like four panels 25 ~
The bottom seal is performed by folding and crimping 28. Then, after filling the contents and heating the inner and outer sealing surfaces of the four panels 38 to 41 forming the top 23 with the top heater, the four panels 38 to 41 are folded so that the sealing surfaces are in close contact with each other. By overlapping and crimping, the top container is sealed and the paper container 20 is completed. In the paper container having such a shape, of the four panels 25 to 28 forming the bottom portion 21, the panels 26 and 28 are folded under the panels 25 and 27, respectively. As shown in FIG. 3, both panels 26 and 28 have left and right triangular panels 36 and 37 defined by a central panel 33 and oblique creases 34 and 35, respectively, and the entire inner surfaces of both triangular panels 36 and 37 are formed. Each has an inner sealing surface. In addition, a portion of the inner surface of the panel 25 that is in close contact with the inner seal surface of each of the triangular panels 37 of the panels 26 and 28 is the inner seal surface. Similarly, of the inner surface of panel 27, panel 2
The portion of each of the triangular panels 36 closely contacting with the inner seal surface is the inner seal surface. On the other hand, among the four panels 38 to 41 forming the gable roof-type top portion 23 of the paper container, the panels 39 and 41 are two upper panels 38 and 41 forming the roof surface of the gable roof. It is a spout panel folded under 40. As shown in FIGS. 3 and 4, both spout panels 39 and 41 have left and right inner top seal panels 42 and 4 defined by vertical creases.
3, left and right triangular panels 44 and 45 defined by the left and right lateral creases, respectively, and a central inclined panel 46 defined by the two triangular panels and the left and right diagonal creases. Of the panels 39 and 41, the entire inner surfaces of the left and right inner top sealing panels 42 and 43 are inner sealing surfaces. Panels 38 and 4
The upper ends of the 0 are outer top seal panels 47 and 48 defined by horizontal creases, respectively. The upper halves of the inner side surfaces of the outer top seal panels 47 and 48 are inner seal surfaces that are tightly joined to each other, and the lower halves are the inner seal surfaces of the inner top seal panels 42 and 43 of the panels 39 and 41. This is the inner sealing surface that is in close contact. The entire outer surfaces of the inner top sealing panels 42 and 43 of the panels 39 and 41 are outer sealing surfaces that are tightly joined to each other.

In a conventional top heater for heating the inner sealing surface and the outer sealing surface of the above-mentioned four panels 38 to 41 forming the top 23, after being side-sealed as shown in FIG. Expanded panels 38-41
A block 49 (see FIG. 5) which is inserted into the inside from above and heats the inner sealing surface with hot air;
A pair of blocks 50, 50 (see FIG. 3) which are arranged outside of the components 9, 41 and heat the outer sealing surface with hot air have been used. As shown in FIGS. 5 and 6, the block 49 has a hollow box shape with an open upper end, and a large number of hot air outlets 51 at the lower end of the peripheral wall corresponding to the inner sealing surface of the gable roof type top 23. Are drilled. The upper end of the block 49 has a flange 53 attached to an attachment member 52 which is driven to move the block 49 upward and out of the carton 24 for a paper container.
(Omitted in FIG. 6) are formed. Each of the blocks 50, 50 is also formed in a hollow box shape having an open upper end side, and a number of hot air blow holes are formed near the lower end side in correspondence with the outer sealing surface of the gable roof top 23. ing. A flange 54 for attaching to the attachment member 52 is formed on the upper end side of each of the blocks 50. And even with the conventional bottom heater for heating the inner and outer sealing surfaces of the four panels 25 to 28 forming the bottom 21 described above, the blocks 49, 50,
A set of three blocks similar to 50 were used.

[0004]

In the above prior art,
A block 49 is formed on the panel 38 forming the top 23 of the paper container.
When the hot air is supplied into the panels 25 to 28 forming the bottom portion 21 and the hot air is supplied, the hot air flows from a large number of hot air blowing holes 51 provided at substantially predetermined intervals on the peripheral wall of the block 49 to the inner sealing surface. As shown in FIG. 7, the inner sealing surface is uniformly heated by being blown out, but the four corners 54 (see FIG. 3) or 55 of the inner sealing surface at the bottom or top.
(See FIG. 4) is not sufficiently heated and the resin on its surface is not softened to the extent necessary for complete heat sealing. For this reason, in the completed paper container 20 shown in FIG. 2, a highly-sealing seal cannot be obtained, and there is a possibility that the contents may leak due to poor sealing. In order to sufficiently soften the resin on the four corner surfaces of the inner seal surface, the hot air
1 by increasing the hole diameter, increasing the number of holes, or increasing the blowing time of hot air.
It is conceivable to increase the amount of heat given to the corner. But,
In this case, the resin except for the four corners of the inner seal surface is excessively heated, and pinholes are formed in a part of the resin, resulting in poor sealing at that portion, and the contents are removed from the portion. There was a risk of leakage. for that reason,
It was extremely difficult to adjust the temperature and the amount of hot air blown so that the resin on the entire inner sealing surface including the four corners was softened to the extent necessary for complete heat sealing.

The present invention has been made in view of such a conventional problem.
The heater block of a carton for a paper container that can sufficiently soften the entire inner sealing surface including the corners to the extent necessary for complete heat sealing, obtains a highly sealed seal and prevents leakage of contents. To provide.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a bottom and a top which are folded and sealed with a paperboard substrate coated with a thermoplastic resin on the front and back surfaces. A paper container carton heating heater for heating, on a filling machine, a four-sided inner sealing surface at the opened bottom or top of a carton for a paper container formed by punching a paper container having a shape into a developed shape and performing side sealing. A block body, a hollow box-shaped block body that is inserted into the bottom or top of the carton and excluding the four corners of the inner sealing surface with hot air, and a block body outside the four corners of the block body, respectively. And four corner blocks that are inserted into the bottom or top so as to be positioned and mainly heat four corners of the inner sealing surface by hot air. According to this configuration, when the inner sealing surface of the bottom or top of the paper container carton is heated, hot air blown from the block main body inserted into the bottom or top heats portions except the four corners of the inner sealing surface. In addition, mainly four corners of the inner sealing surface are heated separately from other portions of the inner sealing surface by the hot air blown from the four corner blocks located outside the four corner portions of the block body. Alternatively, the four corners of the top can be sufficiently heated independently of the other parts of the inner sealing surface, so that the entire inner sealing surface, including the four corners, is sufficiently softened to the extent necessary for complete heat sealing. You.

According to a second aspect of the present invention, the four corner blocks are hollow cylinders having at least two vertical walls each having a plurality of hot air blow holes formed at a lower end thereof. It is characterized by being driven to swing in an angle range. According to this configuration, each corner block is swung within a predetermined angle range within the bottom or top of the carton for a paper container, so that the hot air blown out from the large number of hot air blowing holes provided in the vertical wall portion of each corner block. Since the direction changes every moment, 4
The corners are more sufficiently heated so as not to leave underheated locations.

The invention according to claim 3 is characterized in that the four corner blocks are driven independently of the block body so as to move in the vertical direction. According to such a configuration, a conventional general filling machine, that is, when the heating block is lowered and inserted into the carton for a paper container, supplies hot air into the block and raises the block to increase the container. When the heater block of the present invention is used in a filling machine configured to stop the supply of hot air when taken out of the carton, the four corner blocks are attached to the carton after the block body is taken out of the carton. By keeping it inserted inside, it is possible to continue heating the four corners of the inner seal surface by the hot air supplied to each corner block.

The invention according to claim 4 is characterized in that the four corner blocks receive hot air supply independently of the block body. According to this configuration, the temperature and pressure of the hot air supplied to the four corner blocks can be made higher than that of the hot air supplied to the block main body. Can be heated well.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of an embodiment of a heater block of a carton for a paper container according to the present invention. The heater block 1 shown in FIG. 1 is obtained by punching a paperboard base material coated with a thermoplastic resin on the front and back surfaces into a shape in which the paper container 20 shown in FIG. It is used to heat the inner sealing surface at the top of the paper container carton 24 on a filling machine. Here, the inner sealing surface at the top of the paper container carton 24 is the inner sealing surface of the four panels 38 to 41 (see FIG. 4) forming the top 23 (see FIG. 2) of the paper container 20.

The heater block 1 is inserted into the top of the carton 24 for a paper container and inserted into four corners 55 (FIG. 4) of the inner sealing surface.
), And a hollow box-shaped block body 2 which is heated by hot air except for the four corners 3 of the block body 2.
And four corner blocks 4 to 7 which are inserted into the top so as to be respectively positioned outside and which mainly heat four corners of the inner sealing surface by hot air.

The block body 2 is formed in the shape of a rectangular tube having an opening at the upper end and a bottom, and has a peripheral wall portion 8 having a substantially rectangular horizontal section. The peripheral wall 8
On the lower end side, a large number of hot air blow-out holes 9 are formed at substantially equal intervals over the entire circumference on the lower end side. In addition, the peripheral wall portion 8
Of the four vertical wall portions 8a to 8d forming the pair, the opposed vertical wall portions 8a and 8c are each bent so that a bent portion extending vertically and slightly projecting inward is formed at the center. ing. This is both vertical walls 8
The pair of opposed spout panels 39 and 41 shown in FIG.
This is for the purpose of corresponding to a shape that is slightly bent inward due to a folding habit at a portion of the vertical crease defining 43. On the other hand, of the four vertical wall portions 8a to 8d forming the peripheral wall portion 8, the pair of opposed vertical wall portions 8b and 8d are flat wall portions. By forming the peripheral wall portion 8 of the block main body 2 in such a shape, the block main body 2 is positioned at a predetermined position in the carton 24 for paper containers, that is, the four panels 25 to 2.
When the hot air blow-out hole 9 is inserted at a position facing the inner seal surface of the inner seal surface 8, each of the vertical wall portions of the peripheral wall portion 8 is opposed to each of the four inner seal surfaces at substantially equal distances. The hot air blown out from the hot air blowing holes 9 uniformly hits each surface of the inner seal surface, so that the thermoplastic resin on each surface can be uniformly heated.

The block main body 2 is driven by driving means such as an air cylinder, a hydraulic cylinder, and a servomotor so that the block main body 2 can be moved up and down on a filling machine (not shown) so as to move in and out of the carton 24 for paper containers. It has become so. Therefore, for example, at the upper end of the block body 2,
A flange may be formed to be attached to a mounting member (not shown) similar to the mounting member 52 (see FIG. 5) that is driven to move vertically on the filling machine. Then, the block body 2 is lowered, and the carton 24
When inserted into the predetermined position, hot air from a heat source (not shown) is supplied into the block main body 2 and the block main body 2 is raised and taken out of the paper container carton 24.
The supply of hot air into the block body 2 is stopped. Further, the four corner portions 3 of the peripheral wall portion 8 of the block main body 2 are formed such that each outer surface is an arc-shaped concave surface.

On the other hand, the four corner blocks 4 to 7
It is an elongated bottomed hollow cylinder having a fan-shaped horizontal cross section. That is, each of the corner blocks 4 to 7 has two vertical wall portions 11 and 12 each having a large number of hot air blowout holes 9 formed at the lower end thereof, and an arc-shaped concave surface of each corner portion 3 of the peripheral wall portion 8. It is a bottomed cylindrical body having an arc-shaped vertical wall portion 13 having a convex surface with the same radius of curvature and having an open upper end. Each of the corner blocks 4 to 7 is inserted into the paper container carton such that the corner 10 formed by the two vertical walls 11 and 12 faces the four corners 55 of the inner sealing surface. The vertical length of each of the corner blocks 4 to 7 is sufficiently longer than the height of the peripheral wall 8 of the block body 2.

Each of the corner blocks 4 to 7 is driven independently of the block main body 2 by the driving means so that the corner blocks 4 to 7 can be moved up and down to enter and exit the carton 24 for the paper container on the filling machine. In order to enable such driving, for example, the upper ends of the four corner blocks 4 to 7 are integrated with one flange (not shown), and the flanges are mounted on the mounting member different from the block main body 2. Alternatively, a flange may be formed at the upper end of each of the four corner blocks 4 to 7, and these four flanges may be mounted on the mounting member different from the block body 2. When the four corner blocks 4 to 7 are lowered and inserted into the paper container carton 24 so as to be located outside the four corner portions 3 of the block body 4, hot air from a heat source (not shown) is applied to each corner. Block 4 ~
The hot air is supplied to the inside of the corner blocks 4 to 7 when the corner blocks 4 to 7 are lifted up and out of the carton 24 for paper containers.

Each of the corner blocks 4 to 7 is driven to swing in a predetermined angle range (for example, at least 90 degrees or more) around the axis I shown in FIG. In order to enable such swinging, the flange formed on the upper end side of each of the corner blocks 4 to 7 is rotatably mounted on the mounting member, and the power of a motor or the like is transmitted via a gear, a cam, or the like. It may be configured to convert to a swinging motion and to transmit to each of the corner blocks 4 to 7.

In the heater block of the carton for a paper container according to the present embodiment having the above-described configuration, in the step of performing top sealing on the filling machine, a predetermined position in the carton 24 for the paper container is determined.
For example, portions excluding the four corners of the inner seal surface due to the hot air blown out from the large number of hot air blow holes 9 of the block body 1 inserted at positions where the hot air blow holes 9 face the inner seal surfaces of the four panels 38 to 41. While being heated, the inner side is formed by the hot air blown out from the many hot air blowout holes 14 of the four corner blocks 4 to 7 inserted into the paper container carton 24 so as to be positioned outside the four corner portions 3 of the block body 1. Mainly four corners of the sealing surface are heated. Therefore, the four corners of the inner seal surface can be sufficiently heated independently of the other portions of the seal surface. Therefore, according to this example, the entire inner sealing surface including the four corners of the top of the carton for a paper container can be sufficiently softened to the extent necessary for complete heat sealing, and a highly sealable seal can be obtained. Leakage of contents can be prevented.

Further, the corner blocks 4 to 7 are swung within a predetermined angle range around the axis I in the carton 24 for the paper container, so that the two vertical walls 11, 12 of the corner blocks 4 to 7 are formed. The direction of the hot air blown out from the large number of hot air blowout holes 14 provided at each time changes every moment. Therefore,
According to this example, the four corners of the inner seal surface that are difficult to heat are more reliably heated so as not to leave a part where heating is insufficient, and
The corners can be more efficiently and reliably softened.

The four corner blocks 4 to 7 are:
By being driven independently of the block body 2 so as to move in the vertical direction, a conventional general filling machine, that is, a heating block is lowered and inserted into the carton for paper containers. It can be used for a filling machine configured to supply hot air into the block and to stop the supply of the hot air when the block is raised and taken out of the paper container carton. In this case, after the heated block main body 2 is taken out of the carton 24 for the paper container, the four corner blocks 4 to 7 are kept inserted in the carton 24, whereby each of the corner blocks 4 to 7 is formed. The heating of the four corners can be continued by the hot air supplied to the heater. Therefore, according to this example, the heating time of the four corners of the inner seal surface by the four corner blocks 4 to 7 can be adjusted independently of the heating time of the portion excluding the four corners by the block body 2. The sealing surface can be efficiently heated.

Then, the four corner blocks 4 to 7
By receiving hot air supplied independently of the block body 2, the temperature and pressure of the hot air supplied to the four corner blocks can be made higher than the hot air supplied to the block body. . Therefore, according to this example, it is possible to efficiently heat the four corners of the inner seal surface that are difficult to heat. Furthermore, by reducing the diameter of the large number of hot air blowout holes 14 provided in the four corner blocks 4 to 7, the hot air blown out from each hole 14 can be made high pressure, or the number of hot air blowout holes 14 can be increased to increase the number of hot air blowout holes 14. By increasing the blowing amount, the four corners can be heated more efficiently.

In the above, the example of the heater block for heating the inner sealing surface at the top of the paper container carton 24 has been described. However, when the inner sealing surface at the bottom is heated, the block body 2 and the corner blocks 4 to 7 are also used. The same effect can be achieved by providing the hot-air blowing holes provided in the portion corresponding to the inner sealing surface. Also,
The heater block of the present invention can be applied not only to a gable roof type paper container as shown in FIG. 2 but also to a so-called flat type paper container.

[0022]

As described above, according to the first aspect of the present invention, the entire inner sealing surface including the four corners at the bottom or top can be sufficiently softened to the extent necessary for complete heat sealing. As a result, a highly-sealing seal can be obtained, and leakage of contents can be prevented.

According to the second aspect of the present invention, the four corners of the inner seal surface, which are difficult to heat, are more reliably heated so as not to leave insufficiently heated portions, and the four corners are more efficiently and reliably softened. Can be done.

According to the third aspect of the invention, the heating time of the four corners of the inner sealing surface by the four corner blocks is
It can be adjusted independently of the heating time of the block body except for the four corners, and the inner sealing surface can be efficiently heated.

According to the fourth aspect of the present invention, it is possible to efficiently heat the four corners of the inner seal surface that are difficult to heat.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of an embodiment of a heater block of a paper container carton according to the present invention.

FIG. 2 is a perspective view showing a general paper container.

FIG. 3 is a perspective view showing a carton for a paper container with a side seal already completed.

FIG. 4 is a perspective view showing a top portion of the carton for a paper container shown in FIG.

FIG. 5 is a plan view showing a heater block of the conventional paper container carton.

FIG. 6 is a perspective view showing a block forming a part of the heater block shown in FIG.

FIG. 7 is a sectional view showing a part of the horizontal section of the block shown in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater block 2 Block main body 3 Corner part 4-7 Corner block 8 Peripheral wall part 9 Hot air blowing hole 10 Corner part 11, 12 Vertical wall part 14 Hot air blowing hole

Claims (4)

[Claims] 1. A paper container formed by punching a paperboard substrate having a bottom and a top, each of which is folded and sealed, from a paperboard substrate coated with a thermoplastic resin on the front and back sides, and performing side sealing. A heating block for a carton for a paper container for heating, on a filling machine, four inner sealing surfaces at the bottom or top of an open carton, wherein the inner sealing surface is inserted into the bottom or top of the carton. And a hollow box-shaped block main body heated by hot air except for the four corners, and inserted into the bottom or top so as to be positioned outside the four corners of the block main body. And four corner blocks for heating four corners by hot air. 2. The four corner blocks are hollow cylinders having at least two vertical walls each having a large number of hot air blow holes formed at a lower end side, and swing in a predetermined angle range. The heater block for heating a carton for a paper container according to claim 1, wherein the heater block is driven to perform the following operation. 3. The carton for a paper container according to claim 1, wherein the four corner blocks are driven independently of the block body so as to move in a vertical direction. Heater block for heating. 4. The heater for heating a carton for a paper container according to claim 1, wherein the four corner blocks are supplied with hot air independently of the block main body. block.