JP2023136752A - top seal device - Google Patents

Abstract

To provide a top seal device which improves the sharpness of a top cutter.CONSTITUTION: A top seal device includes: an upper side top sealer 31 and a lower side top sealer 32 arranged by sandwiching a packaging material 16; and a top cutter 41 mounted on the lower side top sealer. At seal surfaces 311, 321 of both top sealers, a protrusion part 45 and a recessed part 46 are provided for forming a longitudinal seal. The protrusion part and the recessed part have a trapezoidal longitudinal section respectively, they are arranged alternately in the orthogonal direction with respect to the conveyance direction, and the protrusion part and the recessed part formed on the opposing seal surfaces are engaged with each other and sandwich the packaging material. On the other hand, a tip side of the top cutter is provided with a blade part 411 formed in a triangular wave-shape. A blade tip of each triangle comes into contact with a mountain portion (flat portion formed along an upper base of the protrusion part) of the packaging material, and cuts to push up the protrusion-like portion. Furthermore, since each blade tip comes into contact with each flat portion simultaneously and pushes it at the same timing, a force is applied to the packaging material uniformly, and the packaging material can be cut beautifully.SELECTED DRAWING: Figure 2

Description

The present invention relates to a top seal device.

A pillow packaging machine, which is a type of packaging machine, continuously supplies a band-shaped packaging material wound around a roll of raw material to a bag making machine, and as it passes through the bag making machine, it is made into a cylindrical bag. do. Then, a center sealing device disposed on the downstream side of the bag making device seals the portion where both side edges of the packaging material are overlapped with each other after being made into a cylindrical bag through the bag making device. Further, a product conveyance and supply device is disposed upstream of the bag making machine, and products conveyed from the product conveyance and supply device at predetermined intervals are supplied into the bag making machine. As a result, when the products pass through the bag making machine, the products are stored in the cylindrical packaging material at predetermined intervals, and the products are transported together with the cylindrical packaging material. Then, by sealing and cutting the cylindrical packaging material horizontally at predetermined intervals using a top sealing device placed on the output side of the pillow packaging machine, the pillow packaging body containing the product is sealed. Manufactured. As this top seal device, there is one disclosed in Patent Document 1, for example.

Japanese Patent Application Publication No. 2009-83883

For example, in the case of a top seal device disclosed in Patent Document 1, in which the sealing process and the cutting process for a cylindrical packaging material are performed together in one device, the sealing surfaces of the tips of a pair of top sealers The material is heated and pressurized to heat-seal the material, and while the material is sandwiched, the tip of the cutter blade built into the top sealer is made to protrude from the sealing surface, and the tip of the cutter blade is pressed against the packaging material. I try to cut it.

However, depending on the type of packaging material, it may not be possible to cut it cleanly. This tendency appears particularly when the packaging material is made of a material that is difficult to stretch, such as paper. Therefore, it is desired to develop a top sealing device that can cut cleanly regardless of the type of packaging material.

The above-mentioned problems are described as independent ones, and the present invention does not necessarily need to be able to solve all of the described problems, but only needs to be able to solve at least one problem. We also have the intention to acquire rights to a structure to solve this problem through divisional applications, amendments, etc.

In order to solve the above-mentioned problems, the top seal device of the present invention is a top seal device that (1) seals and cuts a packaging material containing a product in a direction crossing the conveyance direction of the packaging material. The first top sealer includes a first top sealer and a second top sealer disposed with the packaging material in between, and a top cutter mounted so as to be retractable from a sealing surface at the tip of the first top sealer. The sealing surface of the top sealer is provided with first convex portions extending in the conveying direction and first concave portions extending in the conveying direction alternately in a direction intersecting the conveying direction, and the sealing surface of the second top sealer is , second convex portions extending in the conveying direction and second concave portions extending in the conveying direction are provided alternately in a direction intersecting the conveying direction, and the first top sealer and the second top sealer When the packaging material is sandwiched, the first convex portion and the second concave portion face each other, and the first concave portion and the second convex portion face each other, and the top cutter has a tip on the tip side. A large number of tapered blade portions are arranged at a predetermined pitch in a direction intersecting the conveying direction, and the pitch is configured to be an integral multiple of the arrangement pitch of the first convex portion or the first recessed portion. I made it. In this way, each blade edge of the top cutter comes into contact with the packaging material at the same time and cuts into it, making it possible to cleanly cut the packaging material.

(2) Each cutting edge of the blade portion may be configured to match the formation position of the first convex portion in a direction along the conveyance direction. In this way, the cutting edge pushes up/down the peaks of the packaging material, resulting in better cutting performance.

According to the present invention, the sharpness of the top cutter can be improved regardless of the type of packaging material.

FIG. 1 is a front view showing a preferred embodiment of a system in which a top seal device according to the present invention is installed. (a) is a view of the top seal device as seen from the upstream side, (b) is a partially enlarged plan view of the lower top sealer, and (c) is a diagram of the top sealer wrapped with the upper top sealer and the lower top sealer. It is a partially enlarged view seen from the upstream side showing a state in which the material is sandwiched. It is a figure showing an effect.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings. Note that the present invention is not to be construed as being limited thereto, and various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art without departing from the scope of the present invention.

1 to 3 show a preferred embodiment of a top seal device according to the present invention and a pillow packaging machine in which it is installed. The pillow packaging machine 10 includes a product conveyance and supply device 11 and a packaging machine main body 12 arranged in this order from the upstream side, and a packaging material supply device 14 above them.

The product conveyance and supply device 11 is formed of a finger conveyor device that conveys the products 13 at regular intervals and sequentially supplies the products 13 to the packaging machine main body 12 at the next stage. That is, it is constructed by attaching pushing fingers 9 at regular intervals to an endless chain 8 that is stretched between sprockets 7 (only the downstream side is shown in FIG. 1) arranged in front and behind each other. By supplying the product 13 between the front and rear pushing fingers 9, the product 13 is conveyed at the finger pitch of the pushing fingers 9.

The packaging material supply device 14 is for continuously supplying a band-shaped packaging material 16 for wrapping the product 13 to the packaging machine main body 12. This packaging material supply device 14 includes means for supporting an original fabric roll 15 obtained by winding up a band-shaped packaging material 16 into a roll shape. The packaging material supply device 14 transports the band-shaped packaging material 16 continuously pulled out from the original fabric roll 15 along a predetermined transport path, and has rollers 17 (one roller in the figure) for guiding it to the loading site of the packaging machine main body 12. ). The rollers 17 include a drive roller that applies drive to the band-shaped packaging material 16, a tension roller that applies tension, and a free roller that changes the conveyance direction of the band-shaped packaging material 16 or guides the conveyance. . Further, the packaging material supply device 14 is disposed above the bag making machine 22 and supplies the packaging material 16 from above. Alternatively, instead of applying a direct drive to the packaging material 16 to draw it out, the supporting shaft of the material roll 15 is linked to a drive motor such as a servo motor, and the material roll 15 is rotated to feed out the packaging material 16. You can do it like this. Further, in this embodiment, the packaging material 16 is made of a material that is difficult to stretch, such as paper, but is not limited to paper or a material that is difficult to stretch, and various films and the like can be used. In the case of paper material, it is preferable to have a sealant layer on the inner surface side when the material is formed into a cylindrical shape.

The packaging machine main body 12 includes a bag making device 22 on the carry-in side. The bag making machine 22 forms the band-shaped packaging material 16 continuously supplied from the packaging material supply device 14 into a cylindrical shape. Here, as the packaging material 16 passes through the bag making device 22, both side edges 16a of the packaging material 16 are overlapped, and the both side edges 16a protrude below the bag making device 22 and the conveying surface. state.

On the other hand, the products 13 that are sequentially carried out from the product transport and supply device 11 are supplied into the bag making machine 22 . As a result, the product 13 is supplied at predetermined intervals into the packaging material 16 that is made into a cylindrical bag, and thereafter, the product 13 is enclosed within the packaging material 16 that is made into a cylindrical bag. The packaging material is transported in its original condition along with the packaging material.

Further, the packaging machine main body 12 includes a center seal device 23 on the downstream side of the bag making device 22. The center sealing device 23 seals a portion where both side edges 16a of the cylindrical packaging material 16 passed through the bag making machine 22 and made into bags are overlapped. This center sealing device 23 has a structure in which an inlet pinch roller 23a, a bar-shaped center sealer 23b, and an outlet pinch roller 23c are arranged in order from the upstream side at predetermined positions below a pair of left and right upper plates constituting a conveying surface. take.

The pair of left and right entrance-side pinch rollers 23a apply a conveyance force by pinching from left and right a portion where both side edges 16a of the packaging material 16 protruding downward are overlapped. The pair of left and right center sealers 23b have a built-in heater, for example, and heat the both side edges 16a by sandwiching them from both sides. A pair of left and right exit side pinch rollers 23c pinch the both side edges 16a heated by the center sealer 23b from both sides and apply a conveying force. Further, in order to apply this conveying force, the heated and melted portion is pressurized and cooled by the center sealer 23b to complete the heat sealing in order to sandwich it from both sides with a predetermined pressure. This exit side pinch roller 23c is also called a press roller. Further, the center sealing device 23 uses a bar-shaped center sealer 23b in this embodiment, but may have various structures such as a pair of rotating rollers.

Both side edges 16a of the packaging material 16 made into a cylindrical bag by the bag making machine 22 are sealed by the center sealing device 23, and the wrapping direction of the packaging material 16 perpendicular to the packaging material conveyance direction is sealed by the center sealing device 23. It becomes a closed form.

The packaging machine main body 12 includes a lower belt conveyor device 26 and an upper restraining belt device 28 on the downstream side of the center seal device 23. The lower belt conveyor device 26 constitutes a conveyance path for the packaging material 16 containing the product 13. The upper restraining belt device 28 is arranged at a predetermined position above the lower belt conveyor device 26.

Furthermore, the packaging machine main body 12 includes a top seal device 30 downstream of the lower belt conveyor device 26 and the upper restraining belt device 28. The top sealing device 30 seals and cuts the packaging material 16 in a direction perpendicular to the conveyance direction, that is, in a transverse direction. The area to be sealed and cut is a predetermined position between the front and rear products 13. Through this cutting process by the top sealing device 30, the leading end portion of the packaging material 16 (the portion containing the first product 13) is separated from the following packaging material 16, and a packaging body 29 is manufactured. Then, this package 29 is conveyed on the carry-out conveyor device 27.

The top seal device 30 will be explained below. The top sealing device 30 of this embodiment is of a so-called box motion type, and the upper top sealer 31 and the lower top sealer 32, which are arranged vertically opposite to each other with the cylindrical packaging material 16 in between, have built-in heaters. A predetermined drive mechanism moves the sealing surfaces 311 and 321 along a predetermined trajectory while keeping the seal surfaces 311 and 321 facing each other. In other words, the upper top sealer 31 and the lower top sealer 32 move closer to each other from the reference position and sandwich the packaging material 16 from above and below, thereby applying a predetermined pressure to the parts that are in contact with the sealing surfaces 311 and 321, and Heat. Then, the upper top sealer 31 and the lower top sealer 32 move forward toward each other along the moving direction of the packaging material 16 while maintaining the state in which they approach each other and sandwich the packaging material 16 as described above. The moving speed at this time is made equal to the moving speed of the packaging material 16. When the upper top sealer 31 and the lower top sealer 32 move by a predetermined distance, they move away from each other and move in a direction opposite to the moving direction of the packaging material 16 to reach the reference position.

A drive mechanism for moving the upper top sealer 31 and the lower top sealer 32 along a predetermined trajectory has, for example, the following configuration. The upper top sealer 31 is fixed to the lower surface of the upper sealer mount 33 and moves integrally with the upper sealer mount 33. The lower top sealer 32 is fixed to the upper surface of the lower sealer mount 34 and moves integrally with the lower sealer mount 34. Cam floors 36 are arranged on both sides of the upper sealer mount 33 and the lower sealer mount 34 so as to protrude outward. This cam floor 36 is a groove provided in a cam plate 37 that is rotatably supported by a bearing on the inner surface of a machine frame 35 that basically has a substantially square shape that surrounds the packaging material 16. It matches the cam and moves along the above-mentioned predetermined trajectory according to the shape of the grooved cam.

This cam plate 37 is connected to one end of a rotating shaft 38. The other end of the rotating shaft 38 projects outside the machine frame 35 and is connected to a synchronous gear 39. Synchronous gears 39 connected to the upper and lower rotating shafts 38 mesh with each other so that they can rotate in synchronization, and rotate in response to the rotational force of the drive motor 40. Therefore, by rotationally driving the drive motor 40, each cam plate 37 rotates in a predetermined direction, and the upper top sealer 31 and the lower top sealer 32 move using the cam mechanism as described above. Note that the configuration for performing favorable rotation and movement using such a cam mechanism is conventionally known, so a detailed explanation thereof will be omitted. Moreover, instead of using a cam in this way, a plurality of drive motors are provided, such as a drive motor for vertically moving the upper top sealer 31 and lower side top sealer 32, and a drive motor for moving the upper and lower top sealers 32 forward and backward. The upper top sealer 31 and the lower top sealer 32 may be caused to revolve by operating these drive motors at appropriate timings, and various configurations are possible.

A through hole 322 that penetrates vertically is provided on the center line extending in the width direction at the center of the lower top sealer 32 in the direction along the conveying direction, and a top cutter 41 can be moved vertically within the through hole 322. Place it in This top cutter 41 has a blade portion 411 formed at its upper end. The top cutter 41 moves up and down relative to the upper top sealer 31 by receiving force from an air cylinder 42 which is a driving source and is attached to the lower surface of the lower sealer mount 34 . More specifically, the lower end of the top cutter 41 is fixed to a connecting plate 43 and linked to the air cylinder 42 via the connecting plate 43. When the top cutter 41 descends to the standby position, the blade portion 411 is located below the sealing surface 321 and is housed in the lower top sealer 32, and the top cutter 41 rises to the operating position. Then, the blade portion 411 is located above the sealing surface 321 and protrudes to the outside of the sealing surface 321.

On the other hand, a narrow groove 312 is formed on the center line of the upper top sealer 31 at a position facing the top cutter 41. As a result, the air cylinder 42 is operated to move the top cutter 41 in the standby position upward at the timing when the packaging material 16 is sandwiched from above and below between the upper top sealer 31 and the lower top sealer 32 and heat-sealed. A blade portion 411 protruding upward from the surface 321 enters into a groove 312 provided in the upper top sealer 31. As a result, the packaging material 16 is cut laterally along the blade portion 411 thereof.

In this embodiment, each of the seal surfaces 311 and 321 is a seal stitch for forming a vertical seal on the top seal portion of the package 29 formed by the top seal device 30. That is, as shown enlarged in FIGS. 2(b) and 2(c), the sealing surfaces 311 and 321 have a convex portion 45 and a concave portion 46 extending along the conveying direction. The layout is arranged alternately in orthogonal directions. The convex portion 45 formed on the sealing surface 311 of the upper top sealer 31 is opposed to the concave portion 46 formed on the sealing surface 321 of the lower top sealer 32, and the concave portion 46 formed on the sealing surface 311 of the upper top sealer 31 faces In this case, the convex portions 45 formed on the sealing surface 321 of the lower top sealer 32 were made to face each other, and the convex portions 45 and the concave portions 46 were dimensioned to fit together. As a result, when the upper top sealer 31 and the lower top sealer 32 move toward each other by the above-mentioned drive mechanism and the packaging material 16 is sandwiched between the sealing surfaces 311 and 321, the respective convex portions 45 are moved into the opposing recess portions 46. By entering and mating, the sandwiched packaging material 16 deforms along the shapes of the convex portions 45 and concave portions 46. Then, by heating and pressurizing it in that state, it is sealed in the shape, and a wavy shape in which concave portions and convex portions extending from the main body side of the package 29 toward the tip of the top seal portion are repeated alternately in the width direction is formed. This will be the vertical seal.

Furthermore, in this embodiment, the recess 46 and the projection 45 are approximately trapezoidal. The convex part 45 has a tapered shape, and the tip side becomes a flat part 451 corresponding to the upper base (<lower base) which is the short base of the trapezoid, and on both sides of the flat part 451, hypotenuse parts 452 which are the legs of the trapezoid are formed. It becomes the shape in which it is placed. The inner shape of the recessed part of the recessed part 46 is approximately trapezoidal, and the back side is a flat part 461 corresponding to the upper base (<lower base) which is the short base of the trapezoid, and trapezoidal legs are formed on both sides of the flat part 461. This is the shape in which the oblique side portion 462 is arranged. As described above, since the convex portions 45 and the concave portions 46 are arranged alternately, the oblique side portions 452 of the adjacent convex portions 45 and the oblique side portions 462 of the concave portions 46 are the same portion.

In this way, the unevenness for forming the vertical seal is made into a substantially trapezoidal shape, and the top of the mountain and the bottom of the valley are made into flat parts 451 and 461, so that the gap between the upper top sealer 31 and the lower top sealer 32 is Even if the packaging material 16 sandwiched between is made of a material that is difficult to stretch, such as paper, it is arranged along the flat portions 451 and 461 (see FIGS. 3(a) to 3(b)). Therefore, the packaging material 16 is brought into contact with the seal surfaces 311 and 321 with almost no gaps. As a result, the packaging material 16 is firmly sandwiched between the peaks and troughs of the sealing surfaces 311 and 321, and the entire packaging material, including the area around the center seal where the thickness is thick, is thoroughly heated and sealed neatly. .

In addition, when a packaging material is sandwiched between a conventional top sealer whose sealing surface has triangular wave-like unevenness, the peaks of the peaks provided on the sealing surface alternately urge the packaging material from above and below toward the other side. If the packaging material is difficult to stretch, it will not be able to follow the uneven shape and a space will be formed between the sealing surface and the packaging material. Then, the space becomes a heat insulating layer, and the heat from the sealing surface of the top sealer is not efficiently transferred to the packaging material, resulting in poor sealing or insufficient sealing. This embodiment can prevent such a situation from occurring.

On the other hand, the blade portion 411 on the tip side of the top cutter 41 is formed in a substantially triangular wave shape, and the arrangement pitch t1 of the vertices of each triangle is formed on the sealing surface 321 of the lower top sealer 32 on which the top cutter 41 is mounted. It is set to an integral multiple of the arrangement pitch t2 of the unevenness of the seal stitches. In this embodiment, since both the tip side of the convex part 45 and the back side of the concave part 46 are flat parts 451, 461, the arrangement pitch t2 is, for example, at a predetermined position (for example, the center, etc.) of the adjacent flat part 451. It is best to use intervals. The integral multiple may be one (same interval), but in this embodiment it is two.

Furthermore, in the present embodiment, each cutting edge of the blade portion 411 of the top cutter 41, that is, each approximately triangular apex, is formed on the sealing surface 321 of the lower top sealer 32 when viewed in the conveying direction of the packaging material. It is configured to be located at the installation position of the flat part 451 of the convex part 45.

With such a configuration, the packaging material 16 sandwiched between the upper top sealer 31 and the lower top sealer 32 as described above is deformed to match the unevenness of the sealing surfaces 311 and 321, and in this state, the lower side Each vertex of the cutting edge of the blade portion 411 of the top cutter 41 in the standby position of the top sealer 32 faces the flat portion 161 of the packaging material 16 that has been deformed into a convex shape (see FIG. 3(b)). Then, when the top cutter 41 moves upward with the packaging material 16 sandwiched between the upper top sealer 31 and the lower top sealer 32, the cutting edge of the blade portion 411 comes into contact with the flat portion 161 of the opposing packaging material 16 ( (see FIG. 3(c)), and when the top cutter 41 further rises and the blade portion 411 protrudes above the sealing surface 321 (see FIG. 3(d)), the cutting edge will move to the convex portion (mountain) of the packaging material 16. The cutting edge is pushed up, resulting in better cutting quality. At this time, the respective triangular cutting edges constituting the blade portion 411 simultaneously contact the respective flat portions 161 and push up and cut at the same timing, so that force is equally applied to the packaging material 16. Therefore, these effects act synergistically, resulting in more clean cutting.

Further, in the embodiment described above, each cutting edge of the blade portion 411 of the top cutter 41, that is, each approximately triangular apex, is formed on the sealing surface 321 of the lower top sealer 32 when viewed in the packaging material conveyance direction. However, more preferably, the shape of each triangle constituting the blade part 411 is arranged so that the blade tip is located at the installation position of the flat part 451 of the convex part 45, but more preferably, the shape of each triangle constituting the blade part 411 is aligned with the central part of the flat part 451. It is recommended to use isosceles triangles (including equilateral triangles). In this way, cutting is started from the center of the flat area 161 of the packaging material 16, and at the same time, cutting is performed on the oblique side areas 162 of the ridge line located on both sides of the flat area 161, resulting in more clean cutting. .

Furthermore, in the embodiment described above, each cutting edge of the blade portion 411 of the top cutter 41, that is, each approximately triangular apex, is formed on the sealing surface 321 of the lower top sealer 32 when viewed in the conveying direction of the packaging material. However, the present invention is not limited to this, and for example, the flat portion 461 of the recess 46 formed on the sealing surface 321 of the lower top sealer 32 is It can be aligned in various locations, such as in the installation position of the oblique side part 462 or in the installation position of the oblique side part 462. In either case, since the arrangement pitch t1 and the arrangement pitch t2 are set to be an integral multiple, each cutting edge of the top cutter 41 contacts and cuts into the packaging material 16 at the same timing, so that clean cutting can be achieved.

In particular, by making the convex portions and concave portions substantially trapezoidal and providing a flat portion as in this embodiment, the packaging material 16 is brought into contact with the sealing surfaces 311 and 321 almost without gaps, as described above. Along with this, each blade edge of the top cutter 41 hits a predetermined part while the packaging material 16 is firmly sandwiched and gripped by the peaks and troughs of the sealing surfaces 311 and 321, so that the part that comes into contact first can be cleaned cleanly at any position. Can be cut. However, it is preferable to match the flat portions 451 and 461.

Further, in the above-described embodiment, an example was explained in which the top cutter 41 was built into the lower top sealer 32, but the present invention is not limited to this, and the top cutter 41 may be built into the upper top sealer 31.

Further, in the above-described embodiment, a top seal device used in a pillow packaging machine has been described, but the present invention is not limited to this. It can be applied to horizontal three-way packaging machines that perform side sealing, four-sided seal packaging machines that overlap two packaging materials, and top seal devices of various packaging machines. Furthermore, the present invention is not limited to horizontal packaging machines that transport packaging materials horizontally, but may be applied to vertical packaging machines that transport packaging materials vertically.

Further, in the above-described embodiment, the uneven shape of the seal eye is approximately trapezoidal, but the present invention is not limited to this. For example, it may be approximately triangular with rounded vertices, or Various shapes may be used, such as a wave-like smooth uneven shape in which arcs with relatively small arcs are arranged vertically alternately.

Although various aspects of the present invention have been described above using embodiments, these embodiments and explanations are not intended to limit the scope of the present invention, but are intended to contribute to an understanding of the present invention. I would like to add that this is what was provided. The scope of the present invention is not limited to the configuration or manufacturing method explicitly described in the specification, but also includes combinations of various aspects of the invention disclosed herein. Of the present invention, the structure for which a patent is sought has been specified in the attached claims, but at present, even if the structure is not specified in the claims, it is not disclosed in this specification. I would like to state this just to be sure that there is a possibility that I may file a patent claim for this configuration in the future.

13 : Product 16 : Packaging material 161 : Flat part 162 : Oblique part 30 : Top seal device 31 : Upper top sealer 311 : Seal surface 32 : Lower top sealer 321 : Seal surface 41 : Top cutter 411 : Blade part 45 : Convex Part 451 : Flat part 452 : Oblique part 46 : Recessed part 461 : Flat part 462 : Oblique part

Claims (2)

A top sealing device that seals and cuts a packaging material containing a product in a direction transverse to the conveying direction of the packaging material,
a first top sealer and a second top sealer arranged to sandwich the packaging material;
a top cutter mounted to be retractable from the sealing surface at the tip of the first top sealer;
Equipped with
The sealing surface of the first top sealer is provided with first convex portions extending in the conveyance direction and first concave portions extending in the conveyance direction alternately in a direction intersecting the conveyance direction,
The sealing surface of the second top sealer is provided with second convex portions extending in the conveyance direction and second concave portions extending in the conveyance direction alternately in a direction intersecting the conveyance direction,
When the first top sealer and the second top sealer sandwich the packaging material, the first convex part and the second concave part face each other, and the first concave part and the second convex part face each other. configure,
On the tip side of the top cutter, a large number of blade portions each having a tapered tip are arranged at a predetermined pitch in a direction intersecting the conveyance direction, and the pitch is determined by the pitch of the first convex portion or the first concave portion. Top seal device configured at an integral multiple of the arrangement pitch. The top seal device according to claim 1, wherein each cutting edge of the blade portion is configured to match a formation position of the first convex portion in a direction along the conveyance direction.

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