Ultrasonic sealing method for packaging film and packaging machine

Abstract

To provide a method of forming a sealing part having a predetermined traveling direction length by an ultrasonic sealing method, and to provide a packaging machine using the method.SOLUTION: In a method, continuously traveling two overlapped long packaging films are held between a horn vibrating with ultrasonic waves and an anvil arranged opposing to the horn, and the packaging films are welded with each other by the frictional heat by the vibration of the horn. The opposing horn and the anvil have a horizontal direction length surpassing the full width of the packaging film respectively. The horn and / or the anvil are / is moved in a direction mutually approaching with respect to the continuously traveling packaging films, or the horn and the anvil are fixed adjacently, and in an adjacent position of the horn and the anvil, the traveling packaging films are welded with each other continuously in a traveling direction by the ultrasonic vibration by the horn. Thereby, a sealing part is formed having a predetermined traveling direction length.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] This invention relates to an ultrasonic sealing method in which two continuously running overlapping long pieces of packaging film are placed between an ultrasonically vibrating horn and an anvil positioned opposite the horn, and the packaging films are welded together by the vibrations of the horn, and to a packaging machine that utilizes the ultrasonic sealing method. [Background technology]

[0002] Conventionally, a vertical filling and packaging machine such as that described in Patent Document 1 has been known as an apparatus for continuously manufacturing packages by forming a long length of soft packaging film into a bag shape and filling and packaging liquids, viscous substances, such as food and beverages, liquid seasonings, medicines, cosmetics, or powders, granular substances, or other packaged items. This vertical filling and packaging machine is equipped with a vertical sealing roll that folds a strip-shaped packaging film in two and continuously seals the overlapping side edges in the running direction of the packaging film to form a cylindrical shape, and a horizontal sealing roll that seals the cylindrical packaging film over its entire width at regular intervals while filling it with the packaged items, thereby forming horizontal seals.

[0003] In such filling and packaging machines, the so-called heat sealing method is widely adopted for fusion-bonding the packaging film, in which a sealing plate is provided on each of the peripheral surfaces of a pair of sealing rolls, and two overlapping sheets of packaging film are clamped between the opposing sealing plates and fusion-bonded by applying heat and pressure to the packaging films.

[0004] On the other hand, the automatic packaging machine of Patent Document 2 employs an ultrasonic sealing method in which an ultrasonic oscillator vibrates a vibrator, the vibrations are amplified and transmitted to a horn, the packaging film is clamped between the tip of the horn and an anvil (receiving base), and the packaging film is thermally welded by frictional heat caused by the ultrasonic vibrations and pressure. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2005-96849 A [Patent Document 2] JP 2007-269377 A Summary of the Invention [Problem to be solved by the invention]

[0006] The ultrasonic sealing method has the advantage that it does not cause thermal damage to the packaged items compared to the heat sealing method, and can remove the packaged items that are in the sealing position by ultrasonic vibration, so that it can heat-seal the packaging film while preventing the packaged items from getting caught in the sealed part. In addition, it can be suitably used for thick packaging materials and materials that are not prone to heat generation that cannot be sealed by the heat sealing method, and is also very excellent in that it consumes little power, thereby reducing running costs.

[0007] However, when attempting to form a large, smooth seal using the ultrasonic sealing method, the pressure may disperse, making it impossible to seal as intended, and increasing the pressure may place a high load on the vibration oscillator, causing it to stop. Therefore, the length of the seal formed by ultrasonic sealing in the feed direction of the packaging film (hereinafter referred to as the "seal length") is usually around 1 to 2 mm. For this reason, it is difficult to adopt the ultrasonic sealing method in packaging machines for filled packages of liquids, which require particularly high bag-breaking strength. Also, as in Patent Document 1, the seal length of the sealed part is too short (1 to 2 mm) to separate continuously produced packages into individual packages, making it extremely difficult to cut them at the center, and even a slight deviation in the cutting position could result in the packaged contents leaking out.

[0008] For this reason, various methods for forming a long-sealed portion using an ultrasonic sealing method have been studied, and for example, a method has been proposed in which the surface of a horn or anvil is knurled (mesh-like, etc.) to reduce the contact area to form a long-sealed portion. However, this method has problems such as the packaged item getting caught between the knurls (mesh) during welding and being pinched into the sealed portion, causing the pinched packaged item to seep out when the sealed portion is cut, or dirt accumulating on the cutting blade causing rust and soiling other packages.

[0009] In addition, the packaging machine in Patent Document 2 is a so-called box motion type packaging machine in which the packaging film is clamped and moved downward by the horizontal heat sealer (horn and anvil) of the horizontal sealing mechanism, and then the horizontal sealing mechanism is returned upward by one packaging bag and horizontal sealing is performed again, thereby intermittently filling and packaging the packaged items.This means that the production efficiency of packaging bags is poor, and if the packaged item is a liquid, the liquid that is interposed at the horizontal seal position cannot be squeezed out, and there is a risk that the liquid will become caught in the horizontal seal section, resulting in poor sealing.

[0010] Therefore, the object of this invention is to provide a method for forming a seal portion having a predetermined seal length on a continuously running packaging film using an ultrasonic sealing method, and a packaging machine utilizing said method, and in particular, to form a seal portion having a predetermined seal length while continuously filling the packaging film with the packaged items and preventing them from getting caught. [Means for solving the problem]

[0011] In the course of research aimed at achieving the above object, the inventor has discovered a method for welding two continuously running overlapping long sheets of packaging film between an ultrasonically vibrating horn and an anvil disposed opposite the horn, and the packaging films are welded together by frictional heat generated by the vibration of the horn. The opposing horn and anvil are At least one of them has a roll shape,Each of the horns and anvils has a lateral length exceeding the overall width of the packaging film, and the horn and anvil are moved toward each other relative to the continuously running packaging film, or the horn and anvil are fixed in proximity to each other; At least one of the horn and the anvil is rotationally driven to assist the running of the packaging film, They discovered that an ultrasonic sealing method for packaging films is effective, which involves sliding the packaging films between the horn and anvil while the horn vibrates the packaging films, forming a seal having a required length in the running direction, and thus developed the invention.

[0012] In the ultrasonic sealing method of the present invention, (1) The horn and the anvil are configured to be rotatable in opposite directions to each other; (2 )before The horn and anvil are ,one The horn and anvil are non-rotating, and an assist roll is provided at least downstream of the horn and anvil. and rotating and driving the assist roll in place of at least one of the horn and the anvil. to assist the continuous running of the packaging film; ( 3 ) an assist roll is further provided at an upstream position of the opposing horn and anvil, The assist roll at the upstream position is rotated in place of the assist roll at the downstream position, Assisting the continuous running of the packaging film; is a more preferable solution.

[0013] The present invention also provides a packaging machine that includes vertical sealing means for folding back a packaging film that runs continuously in a longitudinal direction at the center so that adhesive layers or sealant layers face each other, and forming vertical seals at side edge portions that run continuously in the running direction of the packaging film to form a tubular shape, and horizontal sealing means that, while filling the tubular packaging film with an article to be packaged, extends across the entire width of the packaging film in a direction perpendicular to the running direction of the packaging film and forms horizontal seals at intervals in the running direction of the packaging film to form a package, the horizontal sealing means being positioned to sandwich the packaging film and including an ultrasonically vibrating horn having a lateral length that exceeds the entire width of the packaging film, and an anvil disposed opposite the horn, and the horn and anvil are disposed opposite each other, BiA Nbil said, At least one of them has a roll shape, The sealing member is configured to move in a direction approaching or separating from the packaging film that runs continuously, and when the transverse seal portion is formed, At least one of the horn and the anvil is rotationally driven to assist the running of the packaging film, We propose a packaging machine characterized in that, when the horn and anvil are close to each other, the packaging films are slid between the horn and the anvil and sequentially welded together as the packaging films run by ultrasonic vibrations from the horn, thereby forming a horizontal seal portion having a required length in the running direction.

[0014] In addition, in the packaging machine of the present invention, (1) The horn and the anvil are configured to be rotatable in opposite directions to each other; (2) The horn and anvil are ,one At least downstream of the horn and the anvil, The horn and the anvil are rotatably driven in place of each other. An assist roll for assisting the continuous running of the packaging film is provided. Preparation To do so, (3) versus At a position upstream of the horn and anvil An assist roll that is driven to rotate in place of the assist roll at the downstream position and assists the continuous running of the packaging film. To prepare, (4) The vertical sealing means comprises an ultrasonic sealing device having an ultrasonically vibrating horn and an anvil disposed opposite the horn; is a more preferable solution. Effect of the Invention

[0015] According to the ultrasonic sealing method for packaging films of this invention, two packaging films running continuously between a horn and an anvil positioned opposite the horn can be ultrasonically vibrated by the horn while sliding between the horn and the anvil, allowing the films to be continuously welded in the running direction. This makes it possible to form a seal section with a longer seal length than conventional methods without overloading the film. Furthermore, even when sealing the packaging film while continuously filling it with packaged items, the ultrasonic vibrations of the horn can eliminate (shake off) any packaged items that are interposed at the sealing position, effectively preventing the packaged items from becoming caught in the seal section.

[0016] The packaging machine of the present invention has excellent production efficiency because it can continuously manufacture packages while filling them with packaged materials using the ultrasonic sealing method, and can also weld the packaging film in a short time, reducing power consumption and running costs. In addition, it can weld thick materials such as retort CPP films and mono-materials (PE and PET materials) that are difficult to bond using the heat sealing method. [Brief description of the drawings]

[0017] [Figure 1] 1 is a schematic diagram showing an embodiment of a packaging machine of the present invention. [Diagram 2] 1A to 1C are diagrams illustrating an embodiment of the ultrasonic sealing method of the present invention, in which (a) shows the state of the horn and anvil before lateral sealing, (b) shows the state during lateral sealing, and (c) shows the state of the horn and anvil at the end of lateral sealing. [Diagram 3] FIG. 4 is a schematic diagram showing another embodiment of the packaging machine of the present invention. [Figure 4] 1A to 1D are diagrams illustrating another embodiment of the ultrasonic sealing method of the present invention, in which (a) shows the state of the horn and anvil before lateral sealing, (b) shows the state at the start of lateral sealing, (c) shows the state during lateral sealing, and (d) shows the state at the end of lateral sealing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a schematic diagram showing the configuration of a vertical filling and packaging machine 1 as one embodiment of the packaging machine of the present invention, and the filling and packaging machine 1 is configured to continuously produce packages filled with packaged items consisting of liquids and the like. Note that the present invention is not limited to the vertical filling and packaging machine of Fig. 1, but can be suitably used in various packaging machines such as vertical pillow type packaging machines, horizontal pillow type packaging machines, and multi-row filling and packaging machines. In addition, the packaged items can be preferably fluid substances such as food and beverages, seasonings, medicines, cosmetics, and other liquid or viscous, jelly-like, powdery, granular, solid, and other fluid substances.

[0019] In the figure, R is a raw roll of packaging film in a wound state, and 10 is the packaging film fed from the raw roll R, which is made of a laminated film obtained by laminating a base film layer made of, for example, a biaxially oriented ethylene-vinyl alcohol copolymer resin and a sealant layer made of, for example, a non-oriented ethylene-vinyl acetate copolymer resin.

[0020] While this long packaging film 10 is running in its longitudinal direction, it is folded back in the width direction at the film folding section 20 so that the sealant layers face each other, and both side edges are overlapped, and the both side edges are vertically sealed continuously in the longitudinal direction by the vertical seal forming section 21 to form the vertical seal section 11 into a tubular shape.

[0021] Next, the cylindrical packaging film 10' is continuously filled with the packaged item M from the nozzle 22 for supplying the packaged item, and the horizontal seal forming section 23 squeezes out the packaged item M at regular intervals in accordance with the bag length of the package P to be manufactured, while sealing the cylindrical packaging film 10' across the entire width. Hold it The horizontal seal portion 12 is formed by fusion bonding.

[0022] Next, the horizontal seal portion 12 is clamped and cooled again by a cooling unit 25 consisting of a pair of horizontal seal rolls to fix the bond, thereby producing a large number of packages P, and automatically filling and packaging the packaged items M into each package P. The packages P produced as described above are cut at the horizontal seal portion 12 at the center position in the running direction of the packaging film 10' by a cutting unit 26, and shipped as single packages or in batches of multiple packages.

[0023] In the filling and packaging machine 1 configured as described above, the horizontal seal forming section 23 consists of an ultrasonic sealing device and, as shown in Figure 2, is equipped with a horn 30 that resonates ultrasonic energy with a frequency of 20 kHz or more generated from a vibration oscillator (not shown) and transmits it to the tip portion, and an anvil 31 that is arranged opposite the horn 30 across the packaging film 10', receives the pressing force of the horn 30, and generates stress on the horn 30.

[0024] The horn 30 and the anvil 31 have a lateral length that exceeds the overall width of the tubular packaging film 10' to be sealed, and in FIG. 2, in one embodiment, both the horn 30 and the anvil 31 are formed of rotatable rollers.

[0025] A method for forming the transverse seal 12 by the transverse seal forming unit 23 (horn 30 and anvil 31) will be described with reference to FIG. 2(a) is a diagram showing the state of the horn 30 and the anvil 31 before the formation of the horizontal seal portion 12. The pair of horns 30 and anvils 31 are configured so that the horns 30 and / or the anvils 31 can be moved toward and away from each other (in the front-rear direction) by, for example, an air cylinder (not shown), or When not filling the package The horn 30 and the anvil 31 are arranged (fixed) in positions adjacent to each other with the packaging film 10' therebetween. Note that in this embodiment, a case in which only the horn 30 is configured to be movable will be described as an example.

[0026] 2(b) is a diagram showing the state of the horn 30 and the anvil 31 when the horizontal seal 12 is formed. When the formation of the horizontal seal 12 starts, the horn 30 moves (advances) in a direction approaching the anvil 31, and the packaging film 10' is clamped between the horn 30 and the anvil 31. As a result, the packaging film 10' is welded at the clamping position by frictional heat caused by the ultrasonic vibration of the horn 30, and the horizontal seal 12 is instantly formed.

[0027] At this time, since both the horn 30 and the anvil 31 have a roll shape and rotate in opposite directions while sandwiching the packaging film 10', the clamped positions of the packaging film 10' can be continuously (sequentially) welded as the film rotates, and a horizontal seal portion 12 that is long in the running direction of the packaging film 10' can be formed, as shown enlarged in the figure.

[0028] In addition, since both the horn 30 and the anvil 31 are in a roll shape and rotate along the running direction of the packaging film 10', frictional resistance with the packaging film 10' can be reduced, and the running packaging film 10' can be smoothly sent downstream while sliding between the horn 30 and the anvil 31.

[0029] In addition, by rotating at least one of the horn 30 and the anvil 31, the horn 30 and the anvil 31 can function as a conveying auxiliary means for the packaging film 10', and a horizontal seal portion 12 having the desired seal length and strength can be formed.

[0030] When the horizontal seal 12 is formed to a predetermined length, the horn 30 moves (rearwards) in a direction away from the anvil 31 and returns to its original position, as shown in FIG. 2(c), and the formation of the horizontal seal 12 is completed.

[0031] Next, another embodiment of the packaging machine of the present invention will be described with reference to Figures 3 and 4. Figure 3 is a diagram showing the configuration of a vertical filling and packaging machine 1 as a packaging machine of this embodiment, and Figure 4 is a diagram explaining a method of ultrasonic sealing by horizontal seal forming section 23 in filling and packaging machine 1 of Figure 3. Only parts different from the above embodiment will be described, and similar components will be given the same reference numerals and detailed description will be omitted.

[0032] The horizontal seal forming section 23 is an ultrasonic device equipped with a horn 30 and an anvil 31 as shown in Fig. 4. As shown in the figure, the horn 30 is of a non-rotating type, has a horizontal length exceeding the overall width of the tubular packaging film 10' to be sealed, has a flat tip portion 30a, and tapers toward the tip portion 30a so that ultrasonic energy is concentrated. On the other hand, the anvil 31 is of a roll shape, and has the same horizontal length as the tip portion 30a of the horn 30.

[0033] In addition, the horn 30 and the anvil 31 may be of any shape as long as they are capable of clamping the packaging film 10'. For example, the anvil 31 may be formed with a flat tip that is roughly the same shape as the horn 30.

[0034] However, when at least one of the horn 30 and the anvil 31 is non-rotating as in this embodiment (the horn 30 is non-rotating in the figure), the conveyance of the packaging film 10' is hindered by the clamping between the horn 30 and the anvil 31 during lateral sealing, and the running of the packaging film 10' is hindered, and there is a risk of the packaging film 10' meandering or wrinkles being generated. Therefore, as shown in the figure, an assist roll 24 that assists the conveyance of the packaging film 10' is provided downstream of the horn 30 and the anvil 31, so that the packaging film 10' can be smoothly transferred downstream by the assist roll 24, and the film can be sent out at a desired film conveyance speed. The pair of assist rolls 24 are driven and controlled in synchronization with the feed speed of the packaging film 10' so as to achieve a required conveyance speed, and the feed speed of the packaging film 10' is determined, for example, by measuring the speed of the packaging film 10 by an encoder provided on the top roll 27 of the filling and packaging machine, and by driving and controlling the vertical seal roll 21 so as to achieve the desired feed speed.

[0035] 4(a) is a diagram showing the state of the horn 30 and the anvil 31 before the formation of the horizontal seal portion 12. The horn 30 and / or the anvil 31 are configured to be movable in directions approaching and separating from each other by an air cylinder (not shown), and in this embodiment, only the horn 30 is configured to be movable.

[0036] 4(b) is a diagram showing the state of the horn 30 and the anvil 31 at the start of forming the horizontal seal portion 12. When the formation of the horizontal seal portion 12 starts, the horn 30 moves (advances) in a direction approaching the anvil 31, and the packaging film 10' is clamped between the horn 30 and the anvil 31. As a result, the packaging film 10' is instantly welded at the clamping position by frictional heat caused by the ultrasonic vibration of the horn 30.

[0037] As shown in Fig. 4(c), the packaging film 10' is sandwiched between the horn 30 and the anvil 31 and is pulled downward while sliding by a pair of assist rolls 24 provided downstream of the horizontal seal forming section 23. Therefore, as the packaging film 10' travels, the sandwiched positions are continuously (sequentially) welded, and a horizontal seal 12 that is long in the traveling direction of the packaging film 10' is formed as shown enlarged in the figure.

[0038] In addition, when the horizontal seal portion 12 is formed, as described above, the packaging film 10' is assisted in its running by the assist roll 24, and tension is applied to the packaging film 10' by the brake roll (raw roll R, etc.) located upstream in the running direction, keeping the film in a taut state (the film is not slack), so that the film can be transported smoothly without being hindered by the horn 30 and anvil 31.

[0039] When the horizontal seal 12 is formed to a predetermined length, the horn 30 moves (rearwards) in a direction away from the anvil 31 and returns to its original position, as shown in FIG. 4(d), and the formation of the horizontal seal 12 is completed.

[0040] The pair of assist rolls 24 are preferably disposed so as to sandwich at least the side end portion of the cylindrical packaging film 10' on the side of the vertical seal portion 11. The material of the assist roll 24 is not particularly limited, but may be, for example, a rubber lining, fluororubber, urethane rubber, iron, stainless steel, or the like.

[0041] Furthermore, when the assist rolls 24 are arranged to clamp both ends of the tubular packaging film 10', when performing lateral sealing, both ends of the packaging film 10' are clamped by the assist rolls 24 while being pulled downward, thereby bringing the packaging film 10' into a tensed state at the lateral sealing position, thereby suppressing the occurrence of wrinkles, etc. in the lateral seal portion 12 and preventing sealing defects such as liquid leakage.

[0042] Furthermore, when the horizontal seal section 12 is formed, the packaged goods are continuously filled into the tubular packaging film 10', but at the horizontal seal position the packaged goods are squeezed out by the horn 30 and the anvil 31 and are also removed (shaken off) by the vibration of the horn 30, thereby preventing the packaged goods from getting caught in the horizontal seal section 12 and effectively preventing poor sealing.

[0043] The seal length of the horizontal seal section 12 (the length in the running direction of the packaging film 10') is preferably 2.4 mm or more, and more preferably 2.4 to 30 mm, in consideration of the misalignment that occurs when the continuously produced packages P are cut by the cutting section 26 at the center in the running direction of the packaging film 10' and the bag breaking strength when made into single-packaged packages P. The conveying speed of the packaging film 10', the clamping time of the packaging film 10' between the horn 30 and the anvil 31, the ultrasonic transmission time of the horn 30, etc. are appropriately determined to achieve the required seal length.

[0044] The assist roll 24 may be provided not only downstream of the horizontal seal forming section 23, but also upstream. In this case, for example, the upstream assist roll 24 assists in the transport of the packaging film 10 by controlling its drive so that the packaging film 10 runs at a constant speed at the desired speed, while the downstream assist roll 24 rotates faster than the upstream assist roll 24 to pull the packaging film 10' downward. This keeps the packaging film 10' at the intended horizontal seal position in the horizontal seal forming section 23 in a tensed state, thereby suppressing the occurrence of wrinkles, sagging, etc., and effectively preventing poor sealing due to wrinkles, etc. in the horizontal seal section 12.

[0045] In the above embodiment, the ultrasonic sealing method and packaging machine of the present invention have been described as an example of a case where the packaged items are continuously filled and packaged in the packaging film 10'. When the packaged items are continuously filled and packaged, it is necessary to make at least one of the horn 30 and the anvil 31 movable and seal the packaged items while squeezing them out with the horn 30 and the anvil 31. However, when the packaged items are not filled in the packaging film 10' (when a packaging bag containing unfilled packaged items is produced), the horn 30 and the anvil 31 may be fixed and arranged in close proximity to each other with the packaging film 10' sandwiched therebetween. In this case, the horn 30 is vibrated / stopped in accordance with the timing of the lateral seal, so that the lateral seal portion 12 can be formed at a predetermined position on the traveling packaging film 10' with a predetermined length in the traveling direction.

[0046] Furthermore, in the packaging machine 1 of the present invention, it is preferable that not only the horizontal seal portion forming section 23 but also the vertical seal portion forming section 21 consist of an ultrasonic sealing device, which is effective for packaging films such as thick packaging films (retort CPP films) for which the filling speed could not be increased using conventional heat sealing methods, and effectively improves production efficiency. [Industrial Applicability]

[0047] Although the above embodiment shows a case where a three-sided sealed package is manufactured, the present invention is not limited to a three-sided sealed package, but can be applied to packaging machines for various packages (packaging bags) such as four-sided sealed, back-sealed, etc. Also, the ultrasonic sealing method of the present invention can be widely used not only for packages (packaging bags) but also for various containers using packaging films. [Explanation of symbols]

[0048] R Original roll P package M Packaged item 1 Filling and packaging machine 10, 10' Packaging film 11 Vertical seal part 12 Horizontal seal section 20 Film folding section 21 Vertical seal forming section 22 Packaged material supply section 23 Horizontal seal forming section 24 Assist Roll 25 Cooling section 26 Cut section 27 Ten Roll 30 Horn 31 Anvil

Claims

1. A method for welding two overlapping, long, continuously running packaging films by clamping them between an ultrasonically vibrating horn and an anvil disposed opposite the horn, the packaging films being welded together by frictional heat generated by the vibration of the horn, comprising the steps of: At least one of the opposing horn and anvil has a roll shape and each has a lateral length exceeding the overall width of the packaging film; A method for ultrasonically sealing a packaging film, comprising the steps of: moving the horn and / or anvil in a direction approaching each other relative to the continuously running packaging film; or fixing the horn and the anvil in close proximity; and rotating at least one of the horn and the anvil to assist the running of the packaging film; sliding the running packaging films between the horn and the anvil at a position close to each other, while welding the running packaging films sequentially by ultrasonic vibration from the horn as they run, thereby forming a seal portion having a required length in the running direction.

2. 2. The method of claim 1, wherein the horn and the anvil are configured to be rotatable in opposite directions.

3. 2. The method for ultrasonically sealing a packaging film according to claim 1, wherein one of the horn and the anvil is non-rotating, an assist roll is provided at least downstream of the horn and the anvil, and the assist roll is driven to rotate in place of at least one of the horn and the anvil to assist the continuous running of the packaging film.

4. The ultrasonic sealing method for a packaging film according to claim 3, further comprising providing an assist roll upstream of the opposing horn and anvil, and rotating the assist roll upstream instead of the assist roll downstream to assist the continuous running of the packaging film.

5. a vertical sealing means for folding back the packaging film running continuously in the longitudinal direction at the center so that the adhesive layer or sealant layer faces each other, and forming vertical seal portions at the side edge portions that run continuously in the running direction of the packaging film to form a cylindrical shape; a transverse sealing means for filling the cylindrical packaging film with the packaged product while forming transverse seal portions at intervals in the running direction of the packaging film, the transverse seal means extending across the entire width of the packaging film in a direction perpendicular to the running direction of the packaging film, to form a package; In a packaging machine comprising: The lateral sealing means is positioned so as to sandwich the packaging film and includes an ultrasonically vibrating horn having a lateral length exceeding the overall width of the packaging film, and an anvil disposed opposite the horn; At least one of the horn and the anvil has a roll shape and is configured to move toward or away from each other relative to the packaging film that is continuously running; This packaging machine is characterized in that, when forming the horizontal seal portion, at least one of the horn and the anvil is rotated to assist the running of the packaging film, and at a position close to the horn and the anvil, the packaging films are slid between the horn and the anvil, and the ultrasonic vibrations caused by the horn are used to weld the packaging films sequentially as they run, thereby forming a horizontal seal portion having a required length in the running direction.

6. 6. The packaging machine according to claim 5, wherein the horn and the anvil are configured to be rotatable in opposite directions relative to each other.

7. The packaging machine according to claim 5, characterized in that one of the horn and the anvil is non-rotating, and an assist roll is provided at least downstream of the horn and the anvil, which is rotated in place of at least one of the horn and the anvil to assist the continuous running of the packaging film.

8. A packaging machine as described in Claim 7, characterized in that an assist roll is provided at a position upstream of the opposing horn and anvil, which is rotated in place of the assist roll at the downstream position to assist the continuous running of the packaging film.

9. The packaging machine according to any one of claims 5 to 8, characterized in that the vertical sealing means is an ultrasonic sealing device equipped with an ultrasonically vibrating horn and an anvil arranged opposite the horn.

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