JP2017081573A - Former and vertical bag making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress friction resistance generated between a former and a film, suppress deviation or meander of a packaging material, and save energy.SOLUTION: A former 4 transports a belt-state continuous film f in a direction where the film f is continuous, and forms the film into an almost cylindrical shape. The former 4 comprises: a cylindrical part 41 which is a cylindrical shape; a guide skirt 42 which is extended from one end of the cylindrical part 41 in an axial direction to an outside of the cylindrical part 41 in a radial direction; air spraying communication holes 51 provided on both sides of the cylindrical part 41 on the guide skirt 42; and pipelines 52 for feeding air to a space between a surface of the guide skirt 42 and the film f fed along the surface of the guide skirt, from the communication holes 51.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a former for forming a continuous belt-like film into a cylindrical shape, and a vertical bag making machine including the former.

  As disclosed in Patent Document 1, in a vertical bag making and filling machine, a film (wrapping material) continuous in a belt shape is conveyed along a bag making cylinder to be formed into a substantially cylindrical shape, and then both ends in the width direction of the film. The part is vertically sealed along the direction in which the film continues. The film formed in a cylindrical shape is fed along a bag-making cylinder by a feeding belt, and the bottom thereof is laterally sealed in the width direction of the film. Then, after filling the contents from the upper opening of the tubular film through the bag making cylinder, the upper opening is laterally sealed to produce a sealed bag filled with the contents.

  In such a vertical bag making and filling machine, a former is used to form a continuous film into a substantially cylindrical shape. As disclosed in Patent Document 2, the former includes a cylindrical portion and a guide portion (election portion) extending obliquely downward from the upper end of the cylindrical portion toward the outer peripheral side. In such a former, the belt-shaped film is fed obliquely upward along the surface of the guide portion from the lower end portion on the outer peripheral side of the guide portion, and is folded back to the inside of the cylindrical portion at the upper end of the cylindrical portion. Molded into a cylindrical shape.

  In the configuration disclosed in Patent Document 2, air is blown out from a hole formed in a boundary portion between the upper end of the cylindrical portion and the guide portion. This air reduces the frictional resistance generated at the portion where the film is folded from the guide portion to the cylindrical portion, and suppresses the occurrence of wrinkles on the film after folding at the upper end of the cylindrical portion.

JP 2008-37427 A JP-A-6-293304

  By the way, in the vertical bag making and filling machine, the film fed from the upstream side of the former may be offset or meander in the width direction perpendicular to the feeding direction of the film due to frictional resistance with the former. If the frictional resistance is unbalanced with the former in the width direction of the film, the film feed speed is not uniform in the width direction of the film, causing deviation or meandering.

  On the other hand, in the former disclosed in Patent Document 2, the air outlet is only at the folded portion at the boundary between the collar portion and the cylindrical portion of the former, and is installed only at the center in the width direction of the film. Further, it was not possible to sufficiently suppress the deviation of the film and the meandering due to the air blowing. Further, the frictional resistance generated between the former and the film causes a loss in power for feeding the film. For this reason, also from a viewpoint of energy saving, it is desired to suppress the frictional resistance generated between the former and the film.

  The present invention has been made in view of such a problem, and includes a former capable of correcting the deviation and meandering of the packaging material while suppressing the frictional resistance generated between the former and the packaging material. An object of the present invention is to provide a vertical bag making machine.

The present invention employs the following means in order to solve the above problems.
A former according to the present invention is a former that is formed into a substantially cylindrical shape while feeding a continuous packaging material in a strip shape, and a cylindrical cylindrical portion, and a radial direction of the cylindrical portion from one end portion of the cylindrical portion A guide portion that is formed to spread outward and travel the packaging material toward the tubular portion; and a communication hole formed on each side of the packaging material on both sides of the tubular portion in the guide portion; And a gas supply unit that sends gas between the surface of the guide unit and the packaging material from the communication hole.
In the present invention, in the guide part spreading radially outward on both sides of the cylindrical part, by sending gas between the surface of the guide part and the packaging material from the communication holes provided on both sides in the width direction of the packaging material, Frictional resistance generated between the packaging material and the guide portion can be suppressed in the entire width direction of the packaging material. As a result, it is difficult for variations in the distribution of frictional resistance in the width direction of the packaging material to occur, and it is possible to prevent the packaging material from being offset or meandering in the width direction when the packaging material is fed. In addition, since the resistance to the force for transporting the packaging material is reduced, the driving force for transporting the packaging material can be reduced.

Further, in the former according to the present invention, a plurality of communication holes are respectively formed toward the both sides in the width direction of the packaging material in the guide portions on both sides of the cylindrical portion, and a plurality of communication holes are provided in each of the plurality of communication holes. It is preferable to further include a flow rate adjusting unit that individually adjusts the flow rate of the gas to be supplied.
By individually adjusting the flow rate of the gas supplied from the plurality of communication holes, the distribution of the frictional resistance can be made more finely uniform.

In addition, the former according to the present invention includes a sensor for detecting a deviation in the width direction of the packaging material sent to the guide unit, and a flow rate of the gas by the flow rate adjusting unit based on the detection result of the deviation of the packaging material and the meandering by the sensor. And a control unit that corrects the offset of the packaging material by controlling.
When the deviation of the packaging material is detected by the sensor, the deviation of the packaging material and meandering can be reliably suppressed by automatically adjusting the flow rate of the gas blown from the communication hole.

In addition, the former according to the present invention further includes a negative pressure generating portion that is provided on each side in the width direction of the packaging material with respect to the cylindrical portion in the guide portion and places a negative pressure between the guide portion and the packaging material. You may have.
By creating a negative pressure state between the surface of the guide portion and the packaging material by the negative pressure generating portion, the frictional resistance between the guide member and the packaging material is partially increased in the width direction of the packaging material, Deviation and meandering can be suppressed more effectively.

In addition, the former according to the present invention may further include a switching unit that selectively connects the gas supply unit and the negative pressure generation unit to the communication hole.
By providing the switching unit that selectively connects the gas supply unit and the negative pressure generating unit, the degree of freedom in adjusting the frictional resistance between the guide member and the packaging material can be increased.

A vertical bag making machine according to the present invention is a vertical bag making machine for forming a bag body by forming a continuous belt-like packaging material into a substantially cylindrical shape, and is provided below one of the formers described above and the former. A bag-forming tube for forming a packaging material formed into a cylindrical shape by a former, a vertical seal portion for sealing both ends of the packaging material in the width direction within the bag-making tube, and a width of the packaging material And a transverse seal portion that seals in a direction.
In the vertical bag-making machine according to the present invention, the distribution of the frictional resistance in the width direction of the packaging material can be adjusted to prevent the packaging material from shifting or meandering in the width direction. Further, since the resistance to the force for sending the packaging material is reduced, the driving force for feeding the packaging material is small, and energy saving can be achieved.

  According to the former and the vertical bag making machine according to the present invention, the guide portion and the package of the former are formed by feeding gas between the guide portion and the packaging material from the communication holes provided in the guide portions on both sides of the cylindrical portion. While suppressing the frictional resistance generated between the packaging materials and correcting the deviation and meandering of the packaging material, the frictional resistance during traveling of the packaging material is reduced, so that energy saving can be achieved.

It is a mimetic diagram showing the whole vertical bag-making machine composition by a first embodiment of the present invention. FIG. 2 is a front view showing a former formed in the vertical bag making machine shown in FIG. FIG. 3 is a side view of the former shown in FIG. 2. FIG. 3 is a plan view of the former shown in FIG. 2. It is a front view which shows the former | foamer in the vertical bag making machine by 2nd embodiment.

Hereinafter, a former and a vertical bag making and filling machine including the former according to each embodiment of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited only to these embodiments.
(First embodiment)
FIG. 1 is a schematic diagram showing an overall configuration of a vertical bag making and filling machine (vertical bag making machine) according to a first embodiment of the present invention.
A vertical bag making and filling machine 1 shown in FIG. 1 forms a bag body F from a continuous film f in a belt shape, and includes a bag making tube 2, a former 4, a feeding belt 5, a vertical sealer (vertical seal portion). ) 6 and a horizontal sealer (horizontal seal portion) 7.

  The bag making tube 2 has a cylindrical shape extending in the vertical direction, and a former 4 is formed on the outer peripheral surface on the upper side. Between the inner peripheral surface of the former 4 and the outer peripheral surface of the bag making tube 2, a substantially annular space in plan view through which the film f is inserted is formed. The bag making tube 2 protrudes upward from the former 4, and a hopper (not shown) for supplying the contents to be filled in the bag body F is provided at the upper end thereof.

The former 4 is provided in the vicinity of the upper end of the bag making tube 2, and a belt-like film f fed out from the roll 8 is formed into a cylindrical shape and fed into an annular gap between the bag making tube 2.
The feeding belt 5 is provided with a pair facing the radial direction of the bag-making tube 2. The feeding belt 5 conveys the film f fed into the annular gap between the former 4 and the outer peripheral surface of the bag making tube 2 while adsorbing with air.

  The vertical sealer 6 is provided on the outer peripheral surface of the bag making tube 2. The film f formed into a cylindrical shape and intermittently conveyed downward along the outer peripheral surface of the bag-making tube 2 is overlapped so that both ends in the width direction protrude from the bag-making tube 2. The vertical sealer 6 is pressed by sandwiching a portion where the widthwise opposite ends of the film f are overlapped, and continuously heat-sealed in the vertical direction for welding. As a result, both end portions in the width direction of the film f are welded to form a cylindrical body f ′ that is continuous in a cylindrical shape.

  The horizontal sealer 7 is provided below the bag making tube 2. The horizontal sealer 7 welds the cylindrical body f ′ continuously in the width direction. The horizontal sealer 7 welds portions corresponding to the bottom and top of the bag body F, respectively. Further, the horizontal sealer 7 is provided with a cutter (not shown) for cutting the cylindrical body f ′ in the width direction, and the bottom seal portion of the bag F in which the cylindrical body f ′ is welded by the horizontal sealer 7 with this cutter. It cut | disconnects by cut | disconnecting between top part and a top seal part, and the bag body F is formed.

2 to 4 are views showing the former 4 of the vertical bag making and filling machine 1 in the first embodiment. As shown in FIGS. 2 to 4, the former 4 is folded at the cylindrical portion 41 provided in the vicinity of the upper end portion of the bag-making tube 2 and the upper end portion 41 t having a substantially teardrop shape of the cylindrical portion 41. A guide skirt (guide portion) 42 that extends obliquely downward toward the side is integrally formed.
The cylindrical portion 41 has a cylindrical shape in a plan view, and a slit 41 s that is continuous in the vertical direction is formed on one end in the radial direction.
As shown in FIG. 2, the upper end portion 41t of the cylindrical portion 41 has a substantially teardrop shape formed obliquely, and extends from the upper end position 41t1 of the slit 41s at the lower end in the radial direction to the top portion 41t2 at the other end in the radial direction. A ridge line is formed so as to gradually become higher.

As shown in FIGS. 3 and 4, the guide skirt 42 includes a rear guide portion 43 extending upstream of the substantially teardrop-shaped upper end portion 41 t, and a pair of side guide portions 44 extending on both sides of the upper end portion 41 t, Are integrally formed.
The back guide part 43 forms a substantially isosceles triangular plane extending obliquely downward from the top part 41t2 on the other end side in the radial direction at the upper end part 41t of the cylindrical part 41.

  2 and 4, the side surface guide portions 44 are continuously formed on both sides in the width direction of the back surface guide portion 43 with the cylindrical portion 41 interposed therebetween. The side guide portions 44 on both sides extend symmetrically in a convex curved shape from the ridge line portions 43r on both sides of the back guide portion 43 toward the slit 41s. Each side guide portion 44 is formed such that the length from the inner edge portion 44a on the upper end portion 41t side of the cylindrical portion 41 to the outer edge portion 44b gradually decreases from the back guide portion 43 side toward the slit 41s side. Each side guide portion 44 is gradually inclined inward toward the slit 41s.

In such a guide skirt 42, the film f sent from the roll 8 (see FIG. 1) side is sent obliquely upward from the lower end portion 43b of the back guide portion 43 toward the ridge line portion 43r, When the ridge line part 43r on both sides of the back guide part 43 is exceeded, the back side guide part 43 is shaped so as to be curved along the side guide parts 44 on both sides.
Furthermore, the film f is folded downward at the upper end portion 41t of the cylindrical portion 41, thereby forming a substantially cylindrical shape in plan view. In this way, the former 4 forms the strip-shaped film f into a cylindrical shape.

In the former 4, a communication hole 51 that penetrates in the plate thickness direction in each side guide portion 44 is formed as an air outlet. For example, a plurality of communication holes 51 are formed at predetermined intervals from the inner edge portion 44a on the upper end portion 41t side of the cylindrical portion 41 toward the outer edge portion 44b. In the example shown in the figure, the plurality of communication holes 51 are linearly arranged substantially parallel to the ridge line portion 43r, but may be non-linear, for example, arcs.
These communicating holes 51 are arranged in the direction along the ridge line portion 43r at the gentle convex curved surface portion that lowers the film f on each side guide portion 44. The arrangement position of the communication holes 51 is set between the ridge line portion 43 r and the slit 41 s in each side surface guide portion 44.

In FIG. 2, one end of a pipe (gas supply part) 52 is connected to each communication hole 51 on the lower surface side of the side guide part 44. The other end of each pipe 52 is connected to an air supply source 61 such as a pump or a compressor, and a gas such as air is supplied from the air supply source 61 through each pipe 52 to each communication hole 51.
Air blows out from each communication hole 51 toward the surface 44 f of the side guide portion 44. The blown-out air is interposed between the surface 44f of the side guide portion 44 and the film f thereon, so that friction generated between the surface 44f of the side guide portion 44 and the film f when the film f is conveyed. Resistance can be suppressed.

  Further, each pipe 52 is provided with an adjustment valve 53 as a flow rate adjusting unit for adjusting the air flow rate. The opening degree of each adjusting valve 53 is automatically adjusted by the control unit 54, and the distribution of the amount of air blown out in the plurality of communication holes 51 that open to the surface 44 f of the side guide portion 44 can be adjusted.

  As shown in FIG. 1, a meandering detection sensor (sensor) 55 that detects a deviation or meandering of the film f is provided upstream of the former 4 in the feeding direction of the film f. The meandering detection sensor 55 detects, for example, the position in the width direction of the film f and outputs a signal to the control unit 54. The control unit 54 detects the deviation or meandering of the film f from the change in the position and angle in the width direction of the film f detected by the meandering detection sensor 55.

The control unit 54 adjusts the distribution of the amount of air blown from the plurality of communication holes 51 by adjusting the opening degree of the adjustment valve 53 of each pipe 52 when detecting the deviation or meandering of the film f, The frictional resistance generated between the surface 44f of the side guide portion 44 and the film f is adjusted.
Specifically, for example, if the frictional resistance is partially large at a position in the width direction of the film f, the feeding speed of the film f may be slower at some parts in the width direction than at other parts. In this case, the frictional resistance can be reduced by increasing the flow rate of the air blown from the communication hole 51 located at that part, and balance with other parts can be achieved.
Further, in a part where the frictional resistance is smaller than other parts in the width direction and the feeding speed of the film f is partially increased, the frictional resistance is increased by reducing the flow rate of the air blown out from the one communication hole 51. It is also possible to balance film travel with other parts.
In this way, the deviation and meandering of the film f are suppressed.

  As described above, according to the former 4 and the vertical bag making and filling machine 1 according to the present embodiment, the guides are provided from the communication holes 51 arranged in the side surface guide portions 44 on both sides in the width direction of the film f with respect to the tubular portion 41. Air is sent between the surface of the skirt 42 and the film f. Thereby, the frictional resistance generated between the film f and the guide skirt 42 can be suppressed in the entire width direction of the film f.

As a result, variation in the distribution of frictional resistance in the width direction of the film f can be adjusted, and when the film f is conveyed, the film f can be prevented from being offset or meandering in the width direction. In addition, the necessity of finishing the surface of the guide skirt 42 of the former 4 with a small amount of labor and cost is reduced, and the former 4 can be manufactured at a low cost.
In addition, since the resistance to the force for conveying the film f is reduced by reducing the frictional force, the driving force required for the roll 8 and the feeding belt 5 is small for feeding the film f, and the drive motor consumes less power and saves energy. Can be achieved.
Further, by individually adjusting the air flow rate supplied from the plurality of communication holes 51 by the adjustment valve 53 provided in the pipe 52, the distribution of the frictional resistance can be adjusted more finely.

  Further, by detecting the deviation of the film f by the meandering detection sensor 55, the flow rate of the air blown out from the plurality of communication holes 51 by the control unit 54 can be adjusted individually and automatically. Accordingly, the former 4 can surely suppress the deviation and meandering of the film f and perform smooth conveyance and molding of the cylindrical body.

  Note that the former 4 and the vertical bag making and filling machine 1 according to the present invention are not limited to the above-described embodiments, and can be appropriately changed or replaced without departing from the gist of the present invention. Other embodiments and modifications of the present invention will be described below, but the same reference numerals are used for members and parts that are the same as or similar to those of the above-described embodiments, and descriptions thereof are omitted.

(Second Embodiment)
Next, the former 4A and the vertical bag making and filling machine 1 according to the second embodiment of the present invention will be described.
FIG. 5 is a front view showing a former 4A according to the second embodiment of the vertical bag making and filling machine 1 described above. In FIG. 5, a plurality of communication holes 51 penetrating in the thickness direction are formed in the pair of side surface guide portions 44 of the former 4 </ b> A provided in the vertical bag making and filling machine 1 at a predetermined interval. The plurality of communication holes 51 are formed, for example, along the ridge line portion 43r from the inner edge portion 44a on the upper end portion 41t side, which has a substantially teardrop shape of the cylindrical portion 41, toward the outer edge portion 44b.
One end of a pipe 52 is connected to each communication hole 51 on the lower surface side of the side guide portion 44.
Each pipe 52 is provided with an adjustment valve 53 for adjusting the amount of air flow. The opening degree of each adjustment valve 53 is automatically adjusted by the control unit 54, and the distribution of the amount of air blown out from the plurality of communication holes 51 provided on the surface 44 f of the side guide part 44 can be adjusted.

  Further, a switching valve 57 is connected to the upstream side of the adjustment valve 53 in each pipe 52 as a switching unit. An air supply pipe (gas supply unit) 58 connected to an air supply source 61 and an air suction pipe (negative pressure generation unit) 59 connected to a negative pressure source 62 such as a vacuum pump are connected to the switching valve 57. Has been. The switching valve 57 selects one of the air supply pipe 58 and the air suction pipe 59 under the control of the control unit 54 to communicate with the pipe 52.

When the air supply pipe 58 communicates with the pipe 52 by the control unit 54, air is supplied from the air supply source 61 to each communication hole 51, and the surface 44 f and the film f of the side guide part 44 are communicated from each communication hole 51. Air is blown out between. Thereby, the frictional resistance between the surface 44f of the side guide part 44 and the film f is reduced.
When the air suction pipe 59 is communicated with the pipe 52, the film f on the side guide portion 44 is sucked by the communication holes 51 by the negative pressure generated by the negative pressure source 62. Thereby, it can adjust so that the frictional resistance between the surface 44f of the side surface guide part 44 and the film f may be raised.
Here, the switching control of the switching valve 57 provided in each pipe 52 can be performed individually.

  When the meandering detection sensor 55 provided on the upstream side in the film f feeding direction with respect to the former 4A detects the deviation or meandering of the film f, the control unit 54 detects the deviation or meandering direction and dimensions thereof. In accordance with the above, the opening degree of the adjustment valve 53 in each pipe 52 and the switching by the switching valve 57 are automatically controlled. In this way, the distribution of the air blowing amount in the plurality of communication holes 51 is adjusted, and the distribution of the frictional resistance generated between the surface 44f of the side guide portion 44 and the film f is adjusted. If necessary, the frictional resistance between the surface 44f of the side guide portion 44 and the film f is partially increased by sucking the film f through the communication hole 51.

Specifically, for example, when the feeding speed of the film f is slower in some parts in the width direction than in other parts because the frictional resistance is partially large, from the communication hole 51 located in that part. By increasing the flow rate of the blown out air, the frictional resistance is reduced and balanced with other parts.
Further, in a portion where the frictional resistance of the film f is smaller than other portions in the width direction and the feeding speed of the film f is partially increased, the amount of air blown from the communication hole 51 is reduced by the adjusting valve 53. The feeding speed of the film f can be adjusted. Alternatively, the switching valve 57 is switched to suck between the side guide portion 44 and the film f through the communication hole 51. Thereby, the frictional resistance in this part can be increased and the balance with the other part of the width direction of the film f can also be taken.
In this way, it is possible to suppress the deviation and meandering of the film f transported on the guide skirt 42 of the former 4A.

As described above, according to the former 4A and the vertical bag making and filling machine 1 according to the second embodiment, in addition to the function and effect according to the first embodiment, the control unit 54 selects either the air supply source 61 or the negative pressure source 62. Is connected to the pipe 52, and the air blown from the communication hole 51 by the adjustment valve 53 and the negative pressure to be sucked can be selected and supplied. Therefore, by setting a negative pressure between the surface of the guide skirt 42 and the film f, the frictional resistance between the material of the guide skirt 42 and the film f is increased, and the offset and meandering of the film f are more effectively performed. Can be suppressed.
In addition, the switching valve 57 switches between air supply and suction by negative pressure, thereby increasing the degree of freedom in adjusting the frictional resistance between the guide skirt 42 and the film f, and making the film f offset and meander more It can be effectively suppressed.

(Other embodiments)
The formers 4 and 4A and the vertical bag making and filling machine 1 of the present invention are not limited to the above-described embodiments described with reference to the drawings, and various modifications can be considered within the technical scope thereof. .
For example, in the second embodiment, by switching the switching valve 57, air blowing and suction are switched in each communication hole 51. However, the blowing communication hole and the suction communication hole are separately provided. You may make it provide.

In the first embodiment and the second embodiment, the control valve 54 automatically controls the adjustment valve 53 and the switching valve 57. However, the adjustment valve 53 and the switching valve 57 can be manually adjusted for opening. An opening / closing operation may be performed.
Further, the automatic control of the adjusting valve 53 and the switching valve 57 by the control unit 54 may be performed continuously as needed while feeding the film f, or depending on the width, thickness, material, etc. of the film f. You may make it switch the opening degree of the adjustment valve 53, and the switching valve 57 for every lot, every kind, etc. FIG.
In addition to this, the number and arrangement of the communication holes 51 can be changed as appropriate.

1 Vertical bag making and filling machine (Vertical bag making machine)
4, 4A former 6 vertical sealer (vertical seal)
7 Horizontal sealer (horizontal seal)
41 Cylindrical part 42 Guide skirt (guide part)
44 Side guide part 51 Communication hole 52 Piping (gas supply part)
53 Adjusting valve (flow rate adjusting part)
54 Control Unit 55 Meander Detection Sensor (Sensor)
57 Switching valve (switching section)
58 Air supply piping (gas supply part)
59 Air suction piping (negative pressure generator)
f Film (wrapping material)

Claims (6)

A former that is formed into a substantially cylindrical shape while feeding a continuous packaging material in a strip shape,
A tubular portion having a tubular shape;
A guide portion that is formed to spread from one end portion of the tubular portion toward the radially outer side of the tubular portion and travels the packaging material toward the tubular portion;
Communication holes formed on both sides of the tubular portion in the guide portion on both sides in the width direction of the packaging material,
A gas supply part for sending gas between the surface of the guide part and the packaging material from the communication hole;
Former characterized by comprising. A plurality of the communication holes are respectively formed toward both sides in the width direction of the packaging material in the guide portions on both sides of the cylindrical portion,
The former according to claim 1, further comprising a flow rate adjusting unit that individually adjusts a flow rate of the gas supplied to each of the plurality of communication holes by the plurality of gas supply units. A sensor for detecting a deviation in the width direction of the packaging material sent to the guide part;
A control unit that controls the flow rate of the gas by the flow rate adjustment unit based on the detection result of the deviation of the packaging material by the sensor, and corrects the deviation of the packaging material;
The former according to claim 2, further comprising:   The guide portion further includes a negative pressure generating portion that is provided on each side in the width direction of the packaging material with respect to the cylindrical portion and places a negative pressure between the guide portion and the packaging material. Item 4. The former according to any one of Items 1 to 3.   The former according to claim 4, further comprising a switching unit that selectively connects the gas supply unit and the negative pressure generation unit to the communication hole. A vertical bag making machine for forming a bag body by forming a continuous packaging material in a strip shape into a substantially cylindrical shape,
The former according to any one of claims 1 to 5,
A bag-making tube that is provided below the former and that molds the packaging material formed into a cylinder by the former;
A vertical seal part that overlaps and seals both ends in the width direction of the packaging material in the bag making tube,
A lateral seal portion for sealing the packaging material in the width direction;
A vertical bag making machine comprising:

Images