JP2001270010A - Heater block for heating inner surface of carton - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a heater block for heating the inner surface of a carton, in which heating efficiency for an each panel constituting the lower part-closing part and the upper part-closing part of a carton blank is enhanced. SOLUTION: The heater block for heating the inner surface of a carton is equipped with a pair of opposite gusset panels respectively inward tilted and a pair of opposite closing panels, or a pair of opposite gable roof-forming panels respectively inward tilted and a closed-end barrel body 25 equipped with the opposite sides respectively opposed to each inside seal face of a pair of opposite transverse wall-forming panels. Respective many pores 23 blowing out hot air 26 on each opposite side of the barrel body 25 are obliquely tilted so as to blow hot air in the direction nearly orthogonal to each inside seal area tilted inward and provided respectively. Orthogonal blow-out faces 27 in the direction orthogonal to these pores 23 are provided respectively in the outlets of the respective pores 23 tilted obliquely on the each opposite side of the barrel body 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a bottom and a top in a pre-process for sealing an open bottom and a top of a carton for packaging liquid contents such as milk and juice. The present invention relates to a carton inner surface heater block for heating the inner surface of each panel.

[0002]

2. Description of the Related Art FIG. 2 is an external view of a gable-top type paper container 1 called a gable-top type which is completed as a product after packaging liquid contents such as milk and juice. Generally, in a carton blank manufacturing process in this type of paper container manufacturing, a paperboard material in which a thermoplastic resin is laminated on both front and back sides is printed, punched into a predetermined shape, creased, and each process of sticking a cylinder is performed. To form a carton blank 1A in which the container bottom 2 and the container top 3 are open.

[0003] The bottom portion 2 comprises a pair of opposed gusset panels 5 and a pair of closed panels 6 opposed to each other at the lower ends of the body panel 4 on the four sides via folds 4a. . In addition, the top portion 3 includes a pair of facing gable wall forming panels 7 and a pair of facing gable roof forming panels 8 which are provided at the upper ends of the four sides of the body panel 4 via folds 4b. Has become. At each upper end of the gable roof forming panel 8, an elongated strip-shaped top seal panel 8a is provided.

[0004] Such a carton blank 1A is shown in FIG.
And fed to the filling device 9 after being folded flat.
The carton blank 1A is inflated into a cylindrical shape and fitted to one of the radial mandrels 10 of the filling device 9 from the open upper end. The filling device 9 has a structure in which six mandrels 10 are protruded radially around a shaft 11 so as to intermittently rotate clockwise around the shaft 11. Above the filling device 9, a bottom heater 12 is provided.
Is arranged. The bottom heater 12 intermittently moves up and down, and heats with hot air in order to heat seal a pair of unsealed gusset panels 5 and a pair of closed panels 6 supplied immediately below one another. The carton blank 1 </ b> A in which the pair of gusset panels 5 and the pair of closing panels 6 are heated is opposed to the bottom sealing device 13 while being rotated clockwise by the filling device 9. The bottom sealing device 13 forms the bottom 2 by folding the lower open end of the carton blank 1A between the top of the mandrel 10 and pressing and fusing the facing thermoplastic resin. As a result, the carton blank 1A becomes a bottomed cylindrical shape whose lower end is closed by the bottom 2 and whose upper end is open. The bottomed cylindrical carton blank 1A is placed on a conveyor 14 that moves intermittently in the horizontal direction, and is transported rightward in FIG. In the upper part of the conveyor 14 in the transfer direction,
A filling section 15 is provided, and a bottomed cylindrical carton blank 1 is provided.
When corresponding to A, liquid such as milk or fruit juice is filled. On the conveyor 14, a top heater 16 is disposed downstream from the filling unit 15, and hot air is used to heat seal a pair of unsealed marble wall forming panels 7 and a pair of gable roof forming panels 8 of the carton blank 1 </ b> A. To heat.
The carton blank 1 </ b> A, in which the pair of gable wall forming panels 7 and the pair of gable roof forming panels 8 have been heated, then faces the top sealing device 17, and the pair of gable wall forming panels 7 and the pair of gables The roof forming panel 8 is folded, and the thermoplastic resin which opposes by pressing is fused to form the gable roof-shaped container top portion 3, thereby completing the paper container 1.

FIG. 5 is a development view of the inner surface of the lower closing portion 1Ab of the carton blank 1A heated by the bottom heater 12, and the side seal panel is omitted. As is clear from FIG. 4, at the position of the bottom heater 12, the carton blank 1A is turned upside down.
As shown in (1), the lower closing portion 1Ab is open upward. In FIG. 5, an area SLB of the gusset panel 5 and the closing panel 6 where a number of points exist indicates a heated portion to be heated by hot air. That is, when the lower closing portion 1Ab is heated on the mandrel 10, the bottom heater 12 descends from above and receives the pair of gusset panels 5 and the pair of closing panels 6 constituting the lower closing portion 1Ab, Blow hot air horizontally.

FIG. 6 is a perspective view of the bottom heater 12. The bottom heater 12 is inserted into an inner space formed by a pair of gusset panels 5 and a pair of closing panels 6 constituting the lower closing portion 1Ab, and heats the inner surfaces of the gusset panels 5 and the closing panel 6. A cylindrical heater block 18 for heating the inner surface of the carton, and a pair of gusset panels 5 disposed on both sides of the heater block 18 for heating the inner surface of the carton with a gap 19 therebetween to form the lower closing portion 1Ab. Heater block 20 for heating the outer surface of the bottom of the carton, annular cover 21 for fixing the upper portions of these heater blocks 18, 20, and hot air that is connected to this cover 21 and supplies hot air into each heater block 18, 20. And a duct 22. Cover 2
Numeral 1 is integrated with the hot air duct 22 and the heater blocks 18 and 20, and is fixed to the filling portion 15 at a fulcrum (not shown) so as to be movable up and down so that hot air supplied from a hot air supply source (not shown) passes therethrough. The tip block intermittently moves up and down in accordance with the intermittent rotation of the mandrel 10. Each of the gaps 19 is for receiving the gusset panel 5, and has a “ku” shape or a “reverse” shape according to the shape of the temporarily folded gusset panel 5. Accordingly, the heater block 18 for heating the inner surface of the carton has a narrow shape in the middle. The carton inner surface heating heater block 18 has six vertical opposing side surfaces 18a to 18f.
A large number of pores 23 for blowing hot air horizontally are formed in 8a to 18f. The surface of each carton outer surface heating heater block 20 that faces the V-shaped opposed side surfaces 18a and 18b of the carton inner surface heating heater block 18 and the V-shaped recessed opposite side surfaces 18d and 18e is the V-shaped projecting opposite side surface. 20a and 20b, respectively, and opposing side surfaces 2
A large number of pores 24 for blowing hot air horizontally are also formed at 0a and 20b.

FIG. 7 is a developed view of the inner surface of the upper closing portion 1At of the carton blank 1A heated by the top heater 16, and the side seal panel is omitted. In FIG. 7, an area SLT of the gable wall forming panel 7 and the gable roof forming panel 8 where a number of points are present indicates a portion to be heated by hot air. The top heater 16 also
Hot air is blown out from the upper part of the carton blank 1 </ b> A with the upper closing part 1 </ b> A hanging down from above.

FIG. 8 is a perspective view of the top heater 16. The top heater 16 is inserted into an internal space defined by a pair of the gable wall forming panels 7 and the pair of the gable roof forming panels 8 constituting the upper closed portion 1At, and these gable wall forming panels 7 and the gable roof forming panels are inserted. 8, a heater block 18 for heating the inner surface of a carton having a bottomed cylindrical shape and a gap 1 on both sides of the heater block 18 for heating the inner surface of the carton.
A bottomed tubular carton outer surface heating heater block 20 for heating the outer surfaces of a pair of end wall forming panels 7 which are disposed via the upper wall 9 and constitute the upper closed portion 1At, and the upper portions of the heater blocks 18 and 20 An annular cover 21 to be fixed;
Each of the heater blocks 18 and 2 is connected to the cover 21.
And a hot air duct 22 for supplying hot air to the inside. These heater blocks 18, 20 and cover 2
1. The hot air duct 22 is integrated, is fixed to the filling portion 15 so as to be vertically movable, and allows hot air supplied from a hot air supply source (not shown) to pass therethrough. Heater block 1
The shapes and dimensions of the heaters 8 and 20 are the same as those of the heater blocks 18 and 20 of the bottom heater 12 described above, but the hot air blowing pattern is different. As can be seen from the drawing of the paper container 1 with the roof type carton in FIG. 2, the lower closing portion 1Ab is folded at a right angle by the crease 4a to form a closing surface, while the upper closing portion 1At is formed by the crease 4b. Corresponds to the formation of a closed portion through an inclined surface. As a result, as shown in FIG. 7, the inner surfaces of the pair of gable wall forming panels 7 and the pair of gable roof forming panels 8 constituting the upper closed portion 1At of the carton blank 1A are in the area S indicated by a number of points.
It has an LT pattern along the top edge. Returning to FIG. 8, in order to heat this area SLT, a large number of fine pores 23 for blowing out hot air in a horizontal direction are provided on the opposed side faces 18 a to 18 f of the carton inner surface heating heater block 18 in a distributed manner. . Heater block 20 for heating the outer surface of the carton
A large number of pores 24 for blowing hot air in a horizontal direction are also formed on the opposed side surfaces 20a and 20b.

[0009]

In such a bottom heater 12 and a top heater 16, hot air is blown out and the lower closing portion 1Ab and the upper closing portion 1A of the carton blank 1A are blown.
When the inner surfaces of the panels 5 and 6 and the panels 7 and 8 constituting the t are heated by the carton inner surface heating heater block 18, the lower closing portion 1Ab and the upper closing portion 1 of the carton blank 1A are heated.
Also in At, the panels 5 and 6 and the panels 7 and 8 are temporarily folded and slightly inclined inward from the creases 4a and 4b. On the other hand, for example, as shown in FIG.
3 is provided so as to penetrate at right angles to the opposing side surfaces 18a to 18f, so that the blown hot air is directed horizontally, and strikes the inclined panels 5, 6 and the panels 7, 8 at a slight angle. Will be. This has the problem that the energy efficiency is lower than when the hot air impinges on the surfaces of the panels 5, 6 and the panels 7, 8 at right angles, and the heating efficiency is poor.

An object of the present invention is to provide a carton inner surface heating block capable of improving the heating efficiency of each panel constituting a lower closed portion and an upper closed portion of a carton blank.

[0011]

SUMMARY OF THE INVENTION According to the present invention, a bottom or top of a rectangular cylindrical carton having a four-sided body panel formed of a paperboard material laminated on both sides with a thermoplastic resin is provided. A pair of opposing gusset panels and a pair of opposing closure panels inserted into the open end and connected to each lower end of the torso panel and each inwardly inclined to form a bottom, Or, a pair of opposed gable roof forming panels and an inner sealing surface of a pair of opposed wife wall forming panels which are respectively connected to upper ends of the body panel and are inclined inwardly to form a top. In the carton inner surface heating heater block for performing sealing heating by applying hot air to the pair, the pair of gusset panels opposed to each other and
A pair of closure panels, or a pair of opposed gable roof forming panels, each inwardly inclined, and opposing side surfaces respectively opposing each inner sealing surface of the pair of opposing gable wall forming panels. Each of the opposed side surfaces of the cylindrical body is provided with a plurality of small holes for blowing hot air, and each of the small holes has a direction substantially perpendicular to each of the inner sealing surfaces inclined inward. Are provided so as to be obliquely inclined so as to be sprayed.

As described above, when each of the pores is provided in the cylinder so as to be obliquely inclined so that the hot air can be blown in a direction substantially orthogonal to the inwardly sealing inner sealing surfaces of the respective panels, the hot air is The inner sealing surface that is inclined inwardly of the panel is hit in a direction substantially orthogonal to the inner sealing surface, so that the heating efficiency for each panel can be improved as compared with the related art.

According to a second aspect of the present invention, each of the opposed side surfaces of the cylindrical body according to the first aspect has an outlet of each of the obliquely inclined fine holes and a direction orthogonal to the fine holes. Are provided respectively.

As described above, when the outlets of the obliquely inclined fine holes are respectively provided on the opposed side surfaces of the cylindrical body with the orthogonal ejection surfaces orthogonal to the fine holes, the surface of the outlet of each fine hole is provided. Are perpendicular to the pores, and hot air is blown straight out of the exits of the pores, thereby further improving the heating efficiency for each panel constituting the lower closed part and the upper closed part of the carton blank. Can be.

[0015]

FIG. 1 shows an example of an embodiment of a heater block 18 for heating the inner surface of a carton according to the present invention.

In the heater block 18 for heating the inner surface of the carton according to the present embodiment, as described above, the pair of gusset panels 5 and the pair of gusset panels 5 which are respectively inclined inwardly are opposed to each other.
The opposing side surfaces 18a to 18f opposing the inner sealing surfaces of the pair of closing panels 6 or the pair of the gable roof forming panels 8 and the pair of the opposing gable wall forming panels 7 which are respectively inwardly inclined. A bottomed cylindrical body 25 is provided. A large number of pores 23 provided for blowing hot air to each of the opposed side surfaces 18a to 18f of the cylindrical body 25 are provided on the inner sealing surfaces of the panels 5, 6 or the panels 7, 8 inwardly inclined. Are provided obliquely upward so that the hot air 26 can be blown in a direction substantially orthogonal to.

Each of the opposed side surfaces 18a-18 of the cylindrical body 25
At f, orthogonal outlet surfaces 27 are provided at the outlets of the fine holes 23 inclined obliquely upward and orthogonal to the fine holes 23, respectively. This orthogonal ejection surface 27
Even if it is provided individually at the outlet of each of the fine holes 23, or if this orthogonal ejection surface 27 is provided in multiple stages continuously in the horizontal direction, each of the fine holes 2
Each of the outlets 3 may be open or may be opened.

As described above, each of the fine holes 23 is formed in each of the panels 5 and 6.
Alternatively, if the cylinders 25 are inclined and provided so as to be able to blow hot air in a direction substantially perpendicular to the inwardly sealing inner sealing surfaces of the panels 7 and 8, respectively, the hot air 26
Impinges on the inner sealing surfaces of the panels 5, 6 or the panels 7, 8 in a direction substantially perpendicular to the inwardly inclined inner sealing surfaces, so that the heating efficiency for the panels 5, 6, or the panels 7, 8 is made lower than before. Can be improved.

The opposite side surfaces 18a-18 of the cylindrical body 25
f, the outlet surface of each of the pores 23 obliquely inclined is provided with an orthogonal ejection surface 27 in a direction perpendicular to the pores 23. The hot air blows out straight from the outlet of each of the fine holes 23, and heats the panels 5 and 6 or the panels 7 and 8 constituting the lower closing portion 1Ab and the upper closing portion 1At of the carton blank 1A. The efficiency can be further improved. That is, if there is no orthogonal ejection surface 27, the shape of the outlet of each of the fine holes 23 becomes like an overhang when viewed longitudinally, and this overhang generates a downward flow in the hot air 26, thereby reducing the heating efficiency. If the orthogonal ejection surface 27 is provided, the hot air 26 does not flow downward, and the efficiency of heating the panels 5 and 6 or the panels 7 and 8 can be further improved.

[0020]

According to the first aspect of the present invention, in the carton inner surface heating heater block for performing the sealing heating, the hot air is blown in a direction substantially orthogonal to the inwardly inclined inner sealing surfaces of the panels. Since it is provided on each cylinder with a slant so that it can be sprayed, hot air hits each inwardly inclined inner sealing surface of each panel in a direction almost perpendicular to the panel. It can be further improved.

According to the second aspect of the present invention, in the heater block for heating the inner surface of the carton for heating the seal, the opposed side surfaces of the cylindrical body according to the first aspect are perpendicular to the outlets of the obliquely inclined fine holes. Since the orthogonal ejection surfaces are provided, the exit surface of each pore becomes perpendicular to the pores, and hot air blows out straight from the exit of each pore, thereby closing the lower part of the carton blank. The heating efficiency for each panel constituting the section and the upper closing section can be further improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of a carton inner surface heating block according to the present invention.

FIG. 2 is an external view of a gable-top type paper container called a gable-top type.

FIG. 3 is a perspective view of a carton blank in which a container bottom and a container top are open.

FIG. 4 is a perspective view showing a schematic configuration of a filling device dedicated to a paper container.

FIG. 5 is an inner developed view of a lower closed portion of the carton blank heated by the bottom heater.

FIG. 6 is a perspective view of a bottom heater.

FIG. 7 is an inner surface development view of an upper closed portion of the carton blank heated by the top heater.

FIG. 8 is a perspective view of a top heater.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Paper container 1A Carton blank 1Ab Lower closing part 1At Upper closing part 2 Container bottom part 3 Container top part 4 Body panel 4a, 4b Folding 5 Gazette panel 6 Closing panel 7 Wife wall forming panel 8 Gable roof forming panel 8a Top seal panel 9 Filling device 10 Mandrel 11 Shaft 12 Bottom heater 13 Bottom sealing device 14 Conveyor 15 Filling unit 16 Top heater 17 Top sealing device 18 Carton inner surface heating heater block 18a-18f Opposed side surface 19 Void 20 Carton outer surface heating heater block 20a, 20b Opposed side surface 21 Cover 22 Hot Air Duct 23, 24 Pores 25 Cylindrical Body 27 Orthogonal Ejection Surface

Claims (2)

[Claims] 1. A rectangular tube-shaped carton having a four-sided body panel formed of a paperboard material laminated with a thermoplastic resin on both sides, is inserted into the inside of an open end at the bottom or top of the carton.
A pair of opposing gusset panels and a pair of opposing closure panels, each of which is inwardly inclined to form a bottom and is connected to each lower end of the torso panel; Hot air is applied to the inner sealing surfaces of the pair of gable roof forming panels facing each other and inclined inward to form a top and are connected to the upper end, and the pair of facing gable wall forming panels. In the carton inner surface heating heater block for performing heating, the pair of gusset panels facing each other and the pair of closing panels facing each other or each of the pair of closing panels facing each other are inclined inward. A pair of gable roof forming panels and a bottomed cylindrical body having opposing side surfaces respectively opposed to the inner sealing surfaces of the pair of opposing wall forming panels; Each surface is provided with a large number of pores for blowing hot air, and each of the pores is provided obliquely inclined so that the hot air can be blown in a direction substantially orthogonal to each of the inner sealing surfaces inclined inward. A heater block for heating the inner surface of a carton. 2. On each of opposing side surfaces of the cylindrical body, orthogonal outlet surfaces are provided at outlets of the obliquely inclined fine holes, respectively, in a direction orthogonal to the fine holes. The heater block for heating the inner surface of a carton according to claim 1.