JP4722255B2 - Packaging container forming apparatus and packaging container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a packaging container forming apparatus and a packaging container.
[0002]
[Prior art]
Conventionally, for example, when manufacturing a gable-top type packaging container containing liquid food such as milk and soft drinks, a bottomed carton is formed by forming a cylindrical carton having a square cross section by a packaging container molding device. It is like that.
[0003]
In this case, a plate-shaped packaging material having a multilayer structure, in which an innermost layer and an outermost layer are formed by coating a polyolefin resin resin film on a support material such as paperboard, is folded along a fold, A cylindrical carton is formed by fusing the fused parts. When the cylindrical carton is set on a mandrel that is rotatably arranged in the packaging container forming device, a part of the cylindrical carton that constitutes the bottom wall of the packaging container as the mandrel rotates. That is, the carton bottom part is bent along the crease and the predetermined fusion part is fused, and the cylindrical carton becomes a bottomed carton.
[0004]
Thereafter, the bottomed carton is removed from the mandrel, sent to a filling machine, and filled with liquid food. And the part which comprises the inclination upper wall of the packaging container in a bottomed carton, ie, a carton top part, is bent along a crease | fold, a predetermined melt | fusion part is fuse | melted, and a bottomed carton becomes a packaging container.
[0005]
For this purpose, a mandrel face is attached to the tip of the mandrel.
[0006]
FIG. 2 is a perspective view of a conventional mandrel face, and FIG. 3 is a side view of the conventional mandrel face.
[0007]
In the drawing, 11 is a mandrel face, and 13 is a contact surface of the mandrel face 11.
[0008]
In this case, after injecting hot air from a hot air nozzle (not shown) into a carton bottom portion of a cylindrical carton (not shown), the carton bottom portion is bent along a fold, and an overlap portion formed along with the folding is formed. By pressing against the contact surface 13 with a seal plate (not shown), a bottom wall is formed and the cylindrical carton becomes a bottomed carton.
[0009]
[Problems to be solved by the invention]
However, in the conventional packaging container, when the bottomed carton is filled with liquid food, the overlap portion swells outward.
[0010]
FIG. 4 is a view showing a bottom wall of a conventional packaging container.
[0011]
In the figure, 51 is a packaging container, 52 is a bottom wall of the packaging container 51, and 53 is an overlap portion. In this case, the bottom wall 52 bulges outward due to the filled liquid food, and the overlap portion 53 also bulges outward. Therefore, the packaging container 51 cannot be stood in a stable state.
[0012]
Further, when the packaging container 51 is conveyed by a crate (not shown), the overlap portion 53 is pushed up by the crate, so that the overlap portion 53 or an inner peripheral surface in the vicinity thereof is covered with a support material (not shown). The resin film may break out of the resin film, and when the resin breakage occurs, the liquid food leaks from the bottom wall 52.
[0013]
Therefore, it is conceivable to reduce the hot air blowing holes of the hot air nozzle so that hot air is not blown to the parts that do not need to be heated, or the resin film on the inner peripheral surface side is thickened. It cannot be sufficiently prevented from occurring.
[0014]
The present invention solves the problems of the conventional packaging container, can stand the packaging container in a stable state, and can sufficiently prevent the occurrence of resin shortage and the packaging container The purpose is to provide.
[0015]
[Means for Solving the Problems]
Therefore, in the packaging container forming apparatus of the present invention, a mandrel unit that is rotatably arranged and includes a plurality of mandrels, a processing means for bending a carton bottom portion of a cylindrical carton set on the mandrel, A sealing member that presses and overlaps an overlap portion formed by bending the carton bottom portion against the contact surface of the mandrel.
[0016]
The contact surface is made lower as it gets closer to the center, and is formed in a spherical shape.
The seal surface of the seal member is made higher as it gets closer to the center, and is formed so as to protrude into a spherical shape.
An arcuate line is set near each corner of the seal surface.
In addition, one straight line, a straight line extending in parallel with the one straight line, and a straight line extending in parallel to the arcuate line on the sealing surface. An L-shaped line consisting of a straight line extending in a direction perpendicular to the one end of each is set.
And in the center side from the arcuate line, the one linear line and the L-shaped one of the three regions formed by the one linear line and the L-shaped line. A region formed between the arcuate line and the one straight line to accommodate the overlap portion; and the arcuate line; It is made lower than the two regions of the region formed between the L-shaped line.
Further, embossing is formed on the L-shaped line.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0021]
FIG. 5 is a schematic diagram of a packaging container forming apparatus according to an embodiment of the present invention, FIG. 6 is a development view of a cylindrical carton according to an embodiment of the present invention, and FIG. 7 is a schematic diagram of the cylindrical carton according to the embodiment of the present invention. FIG. 8 is a partial perspective view, and FIG. 8 is a diagram showing a state in which the bottom wall of the packaging container in the embodiment of the present invention is formed.
[0022]
In FIG. 5, 17 is a shaft and 18 is a boss. The boss 18 is intermittently rotated in the direction of arrow A by a driving means (not shown). Then, six mandrels 21 are disposed radially outwardly at equal angular intervals on the outer peripheral edge of the boss 18, and each mandrel 21 is rotated as the boss 18 rotates, They are sequentially placed at positions S1 to S6 set in the packaging container forming apparatus. The mandrel 21 has a square shape whose cross section is slightly smaller than the cross section of the cylindrical carton 16. Further, the shaft 17, the boss 18 and the mandrel 21 constitute a mandrel unit.
[0023]
In FIG. 6, reference numeral 15 denotes a packaging material. The packaging material 15 has a multilayer structure, and an innermost layer and an outermost layer are formed by covering a support material such as paperboard with a resin film of a polyolefin-based resin. If necessary, a gas barrier layer made of a gas barrier resin, aluminum foil, or the like can be formed between the support material and the innermost layer.
[0024]
In this case, the packaging material 15 protrudes from the first panel P1, the second panel P2, the third panel P3, the fourth panel P4, the fifth panel P5, and the third panel P3, which are formed adjacent to each other. The sixth panel P6 is formed for manufacturing a gable top type packaging container.
[0025]
The first panel P1 includes a rectangular part a1 that constitutes the side wall of the packaging container, a rectangular part b1 that constitutes the inclined upper wall of the packaging container, a rectangular part c1 that constitutes the bottom wall of the packaging container, and It consists of the rectangular part d1 which comprises the ridge part of a packaging container.
[0026]
Further, the second panel P2 includes a rectangular part a2 constituting the side wall of the packaging container, triangular parts e2, f2, and g2 constituting the inclined upper wall of the packaging container, and triangular parts h2 and i2 constituting the bottom wall of the packaging container. , J2 and rectangular portions k2, m2 constituting the ridge portion of the packaging container.
[0027]
Further, the third panel P3 includes a rectangular part a3 that constitutes a side wall of the packaging container, a rectangular part b3 that constitutes an inclined upper wall of the packaging container, a rectangular part c3 that constitutes a bottom wall of the packaging container, and a ridge of the packaging container It consists of a rectangular part d3 constituting the part.
[0028]
The fourth panel P4 includes a rectangular part a4 that constitutes the side wall of the packaging container, triangular parts e4, f4, and g4 that constitute the inclined upper wall of the packaging container, and triangular parts h4 and i4 that constitute the bottom wall of the packaging container. , J4 and rectangular portions k4 and m4 constituting the ridge portion of the packaging container.
[0029]
Here, x is a mountain fold fold, and y is a valley fold fold. Lines z1 and z2 are valley folds for forming an opening when the packaging container is opened.
[0030]
In the packaging material 15 having the above configuration, when the first panel P1 and the fifth panel P5 are fused, the packaging material 15 becomes a cylindrical carton 16 as shown in FIG. In addition, when it becomes the cylindrical carton 16, the carton top part 22 is rectangular by the rectangular parts b1, b3, d1, d3, k2, k4, m2, m4 and the triangular parts e2, e4, f2, f4, g2, g4. The carton bottom portion 23 is configured by the portions c1, c3, the triangular portions h2, h4, i2, i4, j2, j4 and the sixth panel P6.
[0031]
Subsequently, the cylindrical carton 16 is sent to the packaging container forming apparatus shown in FIG. 5, and a predetermined overlap portion of the carton bottom portion 23 is fused by the packaging container forming apparatus, so that the bottom wall of the packaging container is obtained. Is formed into a bottomed carton.
[0032]
That is, in the packaging container forming apparatus, as shown in FIG. 8, the triangular portions h2 and h4 are pushed toward the center, the triangular portion h2 and the triangular portions i2 and j2, and the triangular portion h4 and the triangular portion. The bottom wall of the packaging container is formed by combining i4 and j4 and combining the rectangular portion c1, the rectangular portion c3, and the sixth panel P6. At this time, the rectangular portion c1 and the triangular portions i2 and j4, the rectangular portion c3 and the triangular portions i4 and j2, the triangular portion h2 and the triangular portions i2 and j2, and the triangular portion h4 and the triangular portions i4 and j4 are combined. The rectangular part c1, the rectangular part c3, and the sixth panel P6 are fused. Therefore, liquid food does not leak from the bottom wall.
[0033]
Next, the operation of the packaging container forming apparatus will be described.
[0034]
When the mandrel 21 is placed at a position S1 as a loading unit, the cylindrical carton 16 is set on the mandrel 21 in the direction of arrow B by a loading device (not shown). In this case, the cylindrical carton 16 is externally fitted to the mandrel 21 so that the carton top portion 22 faces the boss 18 and the carton bottom portion 23 faces radially outward.
[0035]
Subsequently, when the mandrel 21 is placed at a position S2 as a heating part, hot air is jetted from a hot air nozzle 24 as a heating means disposed at the position S2, and the hot air blows the front and back of the carton bottom part 23. By heating, the innermost layer and the outermost layer of the packaging material 15 in the overlap portion are melted. For this purpose, the hot air nozzle 24 is connected to an air heating device (not shown) through a pipe 25, and hot air is generated by the air heating device.
[0036]
Next, when the mandrel 21 is placed at a position S3 as a processing portion, the carton bottom portion 23 is set in a folding device 26 as a processing means, and is bent along the fold lines x and y. As shown in FIG. 3, the triangular portions h2 and h4 are pushed toward the center.
[0037]
Subsequently, while the mandrel 21 is moved from the position S3 to the position S4 as the seal portion, the carton bottom portion 23 is further bent by the guide 27 disposed between the positions S3 and S4. When the mandrel 21 is placed at the position S4, a seal plate 30 as a seal member is advanced inward in the radial direction, and the overlap portion is pressed against a contact surface (not shown) of the mandrel 21. The bottom wall is formed by fusing. In this way, the cylindrical carton 16 becomes the bottomed carton 31.
[0038]
Thereafter, the overlap portion is cooled while the mandrel 21 is moved from the position S4 to the position S6 through the position S5 as a cooling section.
[0039]
When the mandrel 21 is placed at the position S6 as the take-out portion, a suction device as take-out means (not shown) sucks the bottomed carton 31 and removes it from the mandrel 21. Further, a conveyor 32 is disposed at the position S6, and the bottomed carton 31 removed from the mandrel 21 is sent by the conveyor 32 to a filling machine (not shown).
[0040]
Incidentally, a mandrel face (not shown) is attached to the tip of the mandrel 21, and the overlap portion is pressed against the contact surface of the mandrel face by a seal plate 30.
[0041]
1 is a side view of a seal plate in an embodiment of the present invention, FIG. 9 is a plan view of the seal plate in an embodiment of the present invention, FIG. 10 is a plan view of a mandrel face in the embodiment of the present invention, and FIG. FIG. 12 is a side view of the mandrel face in the embodiment of the present invention, and FIG. 12 is a sectional view taken along line XX of FIG.
[0042]
1 and 9, 30 is a seal plate, 31a is a bottom wall of a bottomed carton 31 set on a mandrel 21 (FIG. 5), and the seal plate 30 is formed to face the mandrel face of the mandrel 21. The sealing surface SL1 is provided. Arc-shaped lines q1 to q4 are in the vicinity of each corner of the seal surface SL1, and straight lines q5 and q6 extending in parallel with each other are substantially at the center of the seal surface SL1. A straight line q7 is set, the area AR1 is between the lines q1, q2, and q5, the area AR2 is between the lines q4, q6, and q7, the area AR3 is between the lines q3, q5, and q7, and the lines q1 to q4 are And regions AR <b> 5 to AR <b> 8 are formed between the outer peripheral edge of the seal plate 30. The regions AR5 to AR8 are reference surfaces of the seal plate 30. Further, the bottom wall 31a is positioned so as to fit within a substantially circular portion surrounded by the lines q1 to q4.
[0043]
Incidentally, as shown in FIG. 1, the seal surface SL1 is made higher as it gets closer to the center, and is formed so as to protrude into a spherical shape. The regions AR1 and AR3 are formed to be higher than the regions AR5 to AR8, the regions AR1 and AR2 are formed to have the same height, and the region AR3 is formed to be lower than the regions AR1 and AR2.
[0044]
Therefore, when the seal plate 30 is applied to the bottom wall 31a, the area AR3 includes an overlapping portion of the rectangular portion c1 (FIG. 6), the rectangular portion c3 and the sixth panel P6, and the rectangular portion c1 and the fifth panel P5. Overlapping parts are accommodated.
[0045]
Further, embosses r1 to r4 are adjacent to the lines q1 to q4 in the areas AR1 to AR3, the embosses r5 to r8 are on the line q6, the embosses r9 and r10 are on the line q7, and the line q6 is extended in the area AR3. Embosses r13 and r14 are formed on the line. The embossing r1-r4 can improve the sealing performance of each corner portion of the bottom wall 31a, and the embossing r5-r10, r13, r14 can improve the sealing performance of the overlap portion. In addition, since the embosses r5 to r10, r13, and r14 are formed, even when the bottom wall 31a becomes substantially flat due to the weight of the liquid food after the bottomed carton 31 is filled with the liquid food, it is overlapped. Power to counter the sliding deformation of the part is stored. Therefore, the sealing effect can be increased. Here, δ is a mark for specifying the packaging container.
[0046]
10 to 12, reference numeral 55 denotes a mandrel face. The mandrel face 55 includes a main body portion 56 having an abutment surface SL2 having a shape corresponding to the seal surface SL1 (FIG. 9), and the main body portion 56. A male screw 57 is formed to project from the center toward the boss 18, and is fixed to a mandrel body (not shown) of the mandrel 21 via the male screw 57. Positioning holes 58 and 59 are formed on the back surface of the body portion 56, and the mandrel face 55 is positioned with respect to the mandrel body by inserting protrusions formed on the mandrel body into the holes 58 and 59. be able to.
[0047]
The contact surface SL2 is lowered as it approaches the center from the periphery, and is formed to be recessed in a spherical shape. In addition, a protruding portion 61 having a triangular shape with a height of 0.4 mm is formed as a pressing portion at the center of the contact surface SL2. When the bottomed carton 31 is formed, the protruding portion 61 is set so as to correspond to an overlap portion between the first panel P1 and the sixth panel P6 on the bottom wall 31a. Therefore, when the overlap portion is pressed against the contact surface SL2 by the seal plate 30, it is possible to apply sufficient pressure to the fused portion by the protrusion 61. As a result, it is possible to prevent a sealing failure from occurring.
[0048]
Further, the two edges of the mandrel face 55 are provided with recesses R1 to R4 and are not formed in a straight line. Therefore, the bottomed carton 31 can be easily removed from the mandrel 21 after the bottom wall 31a is formed.
[0049]
Thus, the seal surface SL1 is formed so as to be higher as it is closer to the center, and the contact surface SL2 is formed so as to be lower as it is closer to the center. Does not swell. Therefore, the packaging container can be stood in a stable state.
[0050]
Further, when the packaging container is transported by a crate (not shown), the overlap portion is not pushed up by the crate, so that the resin film coated on the support material on the inner peripheral surface in the overlap portion or its vicinity is used. It is possible to sufficiently prevent the resin from running out. Therefore, it is possible to prevent the liquid food from leaking from the bottom wall of the packaging container.
[0051]
FIG. 13 is a view showing the bottom wall of the packaging container according to the embodiment of the present invention.
[0052]
In the figure, 51 is a packaging container, 52 is a bottom wall of the packaging container 51, and 73 is an overlap portion.
[0053]
In this case, when the bottomed carton 31 (FIG. 5) is formed, the bottom wall 31a (FIG. 9) of the bottomed carton 31 is curved inward by the seal surface SL1 and the contact surface SL2 (FIG. 10). Be made. Accordingly, since the bottom wall 52 of the packaging container 51 is curved in a spherical shape toward the inside, the bottom wall 52 becomes substantially flat even when the weight of the liquid food after filling is added to the bottom wall 52, Does not bulge outward.
[0054]
In addition, this invention is not limited to the said embodiment, It can change variously based on the meaning of this invention, and does not exclude them from the scope of the present invention.
[0055]
【The invention's effect】
As described above in detail, according to the present invention, in a packaging container forming apparatus, a mandrel unit that is rotatably arranged and includes a plurality of mandrels, and a carton bottom of a cylindrical carton set on the mandrel And a sealing member that presses and overlaps an overlap portion formed when the carton bottom portion is bent against the contact surface of the mandrel.
[0056]
The contact surface is made lower as it gets closer to the center, and is formed in a spherical shape.
The seal surface of the seal member is made higher as it gets closer to the center, and is formed so as to protrude into a spherical shape.
An arcuate line is set near each corner of the seal surface.
In addition, one straight line, a straight line extending in parallel with the one straight line, and a straight line extending in parallel to the arcuate line on the sealing surface. An L-shaped line consisting of a straight line extending in a direction perpendicular to the one end of each is set.
And in the center side from the arcuate line, the one linear line and the L-shaped one of the three regions formed by the one linear line and the L-shaped line. A region formed between the arcuate line and the one straight line to accommodate the overlap portion; and the arcuate line; It is made lower than the two regions of the region formed between the L-shaped line.
Further, embossing is formed on the L-shaped line.
[0057]
In this case, since the abutting surface is formed to be recessed and the sealing surface is formed to protrude, the bottom wall of the bottomed carton is formed by the sealing surface and the abutting surface at the time when the bottomed carton is formed. It is curved toward the direction. Therefore, since the bottom wall of the packaging container is curved in a spherical shape toward the inside, even when the weight of the liquid food after filling is added to the bottom wall, the bottom wall becomes almost flat and bulges outward. There is no. As a result, the packaging container can be stood in a stable state.
[0058]
Further, when the packaging container is transported by the crate, the overlap portion is not pushed up by the crate, so that the resin film covered with the support material on the inner peripheral surface in the overlap portion or the vicinity thereof is not cut. Generation | occurrence | production can fully be prevented. Therefore, it is possible to prevent the liquid food from leaking from the bottom wall of the packaging container.
[Brief description of the drawings]
FIG. 1 is a side view of a seal plate according to an embodiment of the present invention.
FIG. 2 is a perspective view of a conventional mandrel face.
FIG. 3 is a side view of a conventional mandrel face.
FIG. 4 is a view showing a bottom wall of a conventional packaging container.
FIG. 5 is a schematic view of a packaging container forming apparatus according to an embodiment of the present invention.
FIG. 6 is a development view of a cylindrical carton in the embodiment of the present invention.
FIG. 7 is a perspective view of a main part of a cylindrical carton in the embodiment of the present invention.
FIG. 8 is a diagram showing a state in which the bottom wall of the packaging container is formed in the embodiment of the present invention.
FIG. 9 is a plan view of a seal plate in the embodiment of the present invention.
FIG. 10 is a plan view of a mandrel face in the embodiment of the present invention.
FIG. 11 is a side view of a mandrel face in the embodiment of the present invention.
12 is a cross-sectional view taken along the line XX of FIG.
FIG. 13 is a view showing a bottom wall of the packaging container in the embodiment of the present invention.
[Explanation of symbols]
16 Cylindrical carton 17 Shaft 18 Boss 21 Mandrel 23 Carton bottom portion 26 Bending device 30 Seal plate 31 Bottom carton 51 Packaging container 52 Bottom wall 73 Overlap portion r1 to r10, r13, r14 Emboss SL1 Seal surface SL2 Contact surface

Claims (2)

(A) a mandrel unit that is rotatably arranged and includes a plurality of mandrels;
(B) processing means for bending a carton bottom portion of a cylindrical carton set on the mandrel;
(C) a seal member that presses and fuses an overlap portion formed by bending of the carton bottom portion against the contact surface of the mandrel;
(D) The contact surface is lowered toward the center, and is formed to be recessed in a spherical shape.
(E) The seal surface of the seal member is made higher as it gets closer to the center, and is formed to project into a spherical shape.
(F) an arcuate line is set near each corner of the sealing surface;
(G) to the center side of the arcuate line in the sealing surface, one straight line, and said one linear straight lines running parallel to the line, and straight extending the parallel An L-shaped line consisting of a straight line extending in a direction perpendicular to one end of the line is set,
(H) at the center side of the arcuate line, the one straight line and of the three regions formed by the L-shaped line, the said one straight line L- region Jo of Ru is formed between the lines, to accommodate the overlap portion, a region that will be formed between the arcuate line and said one straight line, the arcuate lines And a region formed between the L-shaped line and the region formed between the L-shaped line ,
(I) A packaging container forming apparatus, wherein an emboss is formed on the L- shaped line.   The packaging container manufactured by the packaging container molding apparatus according to claim 1, wherein the bottom wall is curved inward when the bottomed carton is formed.

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