JP7807795B2 - Packaging sheet seal and cut unit - Google Patents

Description

The present invention relates to a unit that seals and cuts packaging sheets.

Extraction bags such as tea bags are manufactured using a form-fill-seal packaging machine that fills a packaging sheet with tea leaves or other contents and seals the opening during the process of making a bag from the packaging sheet.If the form-fill-seal packaging machine is vertical, the cylindrical packaging material is cut when the horizontal seal is applied to separate it from the subsequent packaging sheet.
The current mainstream method for this sealing and cutting is the ultrasonic method, in which ultrasonic vibrations are generated in an ultrasonic horn under pressure to weld and cut the packaging material.As described in Patent Document 1, a cylindrical packaging material sheet is held in a flat, overlapping state, and then sandwiched between an ultrasonic horn and a roll-shaped receiving member, which are placed opposite each other and run in a transverse direction to seal and cut the packaging material sheet.

JP 2011-79536 A

Recently, there has been an increasing demand for stronger seals while at the same time producing cleaner cut surfaces. However, the ultrasonic horn and the receiving member correspond one-to-one, and the receiving member performs both the sealing and cutting functions. Increasing the sealing strength dulls the cutting edge accordingly, and the cut surface does not have a clean cross section.
On the other hand, because the receiving member performs both functions, the structure of the unit can be simplified, and maintenance and replacement are also easier.

The present invention was made in response to the above-mentioned problems with the conventional seal and cut unit, and its purpose is to provide a new and useful ultrasonic seal and cut unit that retains the benefits of a simplified unit structure, while increasing seal strength and simultaneously satisfying the need for a clean cut surface.

The present invention has been made to solve the above-mentioned problems, and the invention of claim 1 is a sealing and cutting unit for packaging sheets, comprising an ultrasonic horn and a receiving rod, the ultrasonic horn moves while opposing a linearly continuous opposing surface of the receiving rod so as to be able to seal and cut, the packaging sheet that has been flattened and laid between the opposing surfaces of the ultrasonic horn and the receiving rod is received from the leading end of the direction of movement, sealed and cut, and then discharged, thereby sealing and cutting the packaging sheet, the ultrasonic horn sealing and cutting is performed as it moves while maintaining a posture that is tilted backward in the direction of movement, the unit comprising a pressing portion that holds the flattened and laid packaging sheet still between a pair of pressure contact surfaces and in a taut state,
The receiving rod is detachably attached to one of the pressure contact surfaces via an adapter, and its opposing surface is configured to be able to move in and out from one of the pressure contact surfaces toward the other pressure contact surface, and is fixed so as not to move relative to one of the pressure contact surfaces during sealing and cutting; the receiving rod is made of a square rod with a polygonal cross section, and multiple corners form opposing surfaces, and the multiple opposing surfaces can be used by changing the attachment angle of the receiving rod relative to the adapter.This seal and cut unit is characterized in that

The invention of claim 2 is a seal and cut unit for packaging material sheets as described in claim 1, characterized in that the ultrasonic horn is coaxially cylindrical and the tip opening is cylindrical .

The invention of claim 2 provides the sealing and cutting unit for packaging material sheets according to claim 1 , characterized in that the sealing and cutting unit is provided as a horizontal sealing and cutting unit.

The invention of claim 3 is a sealing and cutting unit for a packaging material sheet according to claim 1 or 2 , characterized in that it is provided as a horizontal sealing and cutting unit in a vertical bag making, filling and packaging apparatus.

In the seal and cut unit of the present invention, the ultrasonic horn and the receiving member correspond one-to-one, and the requirement to increase the seal strength of the packaging sheet while at the same time making the cut surface clean is satisfied.
In addition, the support rod can be made part of the rigid structure, which reduces vibration.The overall structure is also simplified, making maintenance easier.

FIG. 2 is a perspective view of a horizontal seal and cut unit. FIG. 2 is a perspective view of a portion of FIG. 1; 3 is a perspective view of a pressure contact surface portion on the receiving rod attachment side of FIG. 2. [0023]FIG. FIG. 4 is a perspective view of the adapter with the receiving rod of FIG. 3 attached thereto. 5A and 5B are top and cross-sectional views of FIG. 4; FIG. 5 is an exploded perspective view of the receiving rod and adapter of FIG. 4 . FIG. 7 is a side view of the receiving rod of FIG. 6; FIG. 3 is a diagram showing the relative positions of the ultrasonic horn and the receiving rod in FIG. 2 as viewed from above. FIG. 9 is a diagram showing the arrangement relationship of FIG. 8 as viewed from the side. 9 is a diagram showing the state of the packaging material sheet in the position shown in FIG. 8 when sealing and cutting is performed. 11 is an image diagram of the formation and progression of the horizontal seals and the incisions formed in the packaging material sheet in FIG. 10.

An embodiment of the present invention relates to a vertical bag making, filling and packaging apparatus.
In a vertical form-fill-fill-seal packaging machine, as described in Patent Document 1, both widthwise edges of a continuous sheet of packaging material fed downward are vertically sealed by a vertical sealing unit to form a cylindrical shape, and then the cylindrical body is horizontally sealed by a horizontal sealing and cutting unit, and the horizontal seals are cut in the middle to form a bag, which is then separated from the subsequent sheet of packaging material. The horizontal seals form the top and bottom of the preceding and succeeding bags, and the filling material, such as tea leaves, is filled between the horizontal seals.
A horizontal sealing and cutting unit 1 according to an embodiment of the present invention is applied to this vertical bag making, filling and packaging apparatus.
The packaging sheet is expected to be made of heat-sealable materials such as polyethylene fiber nonwoven fabric, and the seal and cut method uses an ultrasonic method that uses ultrasonic vibrations under pressure to generate frictional heat, thereby welding and cutting the material.

As shown in FIG. 1 , in the horizontal seal and cut unit 1, a pair of unit walls 3A, 3B are fixed to the main body of a vertical form-fill-fill-seal packaging machine in an upright, opposing position. A pair of guide shafts 5A, 5B are installed horizontally and parallel between the unit walls 3A, 3B. A pair of sliding blocks 7A, 7B are slidably supported on the guide shafts 5A, 5B, respectively. A connecting plate 9 is fixed to the upper surfaces of the sliding blocks 7A, 7B, and the sliding blocks 7A, 7B are connected via the connecting plate 9. Therefore, the pair of sliding blocks 7A, 7B slide synchronously between the pair of unit walls 3, 3 while being guided by the pair of guide shafts 5A, 5B.
A main body 11a of a cylinder type linear motion mechanism 11 is fixed to the unit wall 3A, and the tip end of the rod is fixed to the connecting plate 9. The extension and contraction direction of the rod is parallel to the axial direction of the guide shafts 5A and 5B.

An ultrasonic horn 13 of the ultrasonic welding/cutting device is fixed to the underside of the sliding block 7A. As shown in Figure 2, the ultrasonic horn 13 is coaxially cylindrical, its axial direction being approximately perpendicular to the axial direction of the guide shaft 5A, and it is tilted slightly to one side in a horizontal plane. The tip opening 13a faces the guide shaft 5B. To maintain the tilted position of the ultrasonic horn 13, the ultrasonic horn 13 is provided with a guide 14 consisting of a pair of guide pieces.
A receiving rod 15 faces the tip opening 13a of the ultrasonic horn 13. This receiving rod 15 is provided on the sliding block 7B side.

6 and 7, the receiving rod 15 is a cylinder of the same diameter whose outer periphery is cut evenly into flat surfaces from four directions, and a large square cross-section portion 17 is formed in the middle. Each of the four corners 17a of this square rod portion 17 is rounded, and the cross section perpendicular to the axial direction is an R-surface, i.e., a curved surface.
In existing horizontal seal and cut units, as described in Patent Document 1, the receiving member is composed of a receiving roll, the outer circumferential surface of which is rounded. This rounded surface serves as the opposing surface facing the tip opening of the ultrasonic horn, and seals and cuts the packaging material sheet sandwiched between them.

The corners 17a of the square bar portion 17, i.e., the rounded surfaces, also serve as opposing surfaces, just like the rounded surfaces of the receiving roll. However, the rounded surfaces of the receiving roll are continuous and curved like an arc, whereas the rounded surfaces of the square bar 17 extend continuously in a straight line. Furthermore, as described below, in the present invention, the corners 17a that the ultrasonic horn 13 faces are not fixed, and move in a continuous direction during sealing and cutting. Therefore, the entire corner 17a is a facing surface, and the portion that faces the ultrasonic horn 13 becomes the facing surface each time.

Both axial ends of the receiving rod 15 are tapered outward, and the outer periphery of each end is cut off to form a round rod portion 19 with a small circular cross section. This round rod portion 19 is connected coaxially to the square rod portion 17.
The ultrasonic horn 13 is disposed so that one of the corners 17a of the square bar portion 17 of the receiving rod 15 faces the tip opening 13a of the ultrasonic horn 13. The axial direction of the receiving rod 15 is parallel to the axial direction of the guide shaft 5B, and due to the tilted position of the ultrasonic horn 13, the gap between the ultrasonic horn 13 and the receiving rod 15 increases from one side to the other in the axial direction.

In Fig. 1, reference numeral 21 denotes a pressing portion, which has a pair of horizontally elongated pressure contact surfaces 21A and 21B. As shown in Fig. 2 and Fig. 3, the pressure contact surfaces 21A and 21B stand with their plate surfaces facing each other. Furthermore, horizontally elongated slots 21a and 21b are formed in the pressure contact surfaces 21A and 21B, respectively, so as to face each other.
The body 23a of the cylinder-type linear motion mechanism 23 is fixed to a mounting plate 4 connected to the unit wall 3A, and the tip side of its rod 23b is fixed to the pressure contact surface portion 21A. The pressure contact surface portion 21A is also connected to the pressure contact surface portion 21B via a link mechanism 25. Therefore, as the rod 23b extends, the pressure contact surfaces 21A and 21B approach each other, and when they approach each other again, they press the cylindrical packaging material sheet together in a flat, overlapping state. As the rod 23b retracts, the pressure contact surfaces 21A and 21B move away from each other, releasing the pressure contact state. The holding portion 21 does not move vertically, so it holds the packaging material sheet in a stationary state.

The tip opening 13a of the ultrasonic horn 13 protrudes through the elongated hole 21a of the pressure contact surface 21A and faces the surface, whether in the pressed state or released state due to the pressure contact described above, but the corner 17a of the receiving rod 15 does not protrude just by being pressed down by the pressure contact described above, and by the operation of the protruding mechanism, it protrudes through the elongated hole 21b of the pressure contact surface 21B and faces the surface, thereby achieving a facing state that allows sealing and cutting.
The protrusion mechanism is configured as follows.

As shown in Figures 4 to 6, the receiving rod 15 is detachably attached to the adapter 27. This adapter 27 has a horizontally elongated storage section 29 that is open on one side, with bearing sections 31, 31 provided at both horizontal ends. The cross section of the storage section 29 has a concave inner surface 29a that is in the shape of an inverted triangle, and three communicating holes 29b, 29b, 29b are formed at the bottom of the concave section at intervals in the horizontal direction. The square bar section 17 of the receiving rod 15 and its outer tapered sections are accommodated in this storage section 29, and the round bar sections 19, 19 are supported by the bearing sections 31, 31. The square bar section 17 abuts against the concave inner surface 29a, allowing them to be accommodated in the opposing position described above. The bearings 31, 31 can move back and forth through guides 33, 33. They are protruded toward the opening of the storage section 29, pushed outward, the receiving rod 15 is inserted between them, and the round rods 19, 19 are inserted through the bearings 31, 31 and then returned to their original position, achieving the above-mentioned storage state.

Reference numeral 35 denotes the connecting portion, which is fixed to the pressure-contact surface portion 21B. The connecting portion 35 is gate-shaped, with both ends 35a, 35a abutting against the plate surface on the non-pressure-contact side of the pressure-contact surface portion 21B from the outside, and a screw head accommodating plate 35c is fitted into the concave surface on the pressure-contact side, and is fixed with screws while sandwiching the pressure-contact surface portion 21B from both sides. The middle portion 35b of the connecting portion 35 is plate-shaped, with its plate surface facing the plate surface of the pressure-contact surface portion 21B.

A main body 37a of the cylinder-type linear motion mechanism 37 is fixed to the outside of the intermediate portion 35b. A receiving portion 38 that receives the square bar portion 17 is fixed to the tip side of the rod 37b. The receiving portion 38 passes through the intermediate portion 35b and enters the communication hole 29b of the storage portion 29.
A pair of shafts 41, 41 are provided on either side of the main body 37a of the cylinder-type linear motion mechanism 37. One axial end of the shaft 41 is loosely fitted into a guide tube 42 that is fixed to and passes through the intermediate portion 35b of the connecting portion 35, and a receiving portion 38 is fixed to the tip end of the shaft 41. The receiving portion 38 also fits into the communication hole 29b of the accommodation portion 29.
The shafts 41, 41 are arranged parallel to the rod 37b, and the square bar portion 17 is supported by three receiving portions 38, . . .
The other axial end of the shaft 41 is fixed to the surface of the connecting plate 39. The shafts 41, 41 are fixed to the same surface of the connecting plate 39 with a gap between them to form a frame, within which the main body 37a of the cylinder-type linear motion mechanism 37 is located. A stopper bolt 44a is attached to the rear end surface of the main body 37a. A stopper 44b is attached to the surface of the connecting plate 39 on the side fixed to the shaft 41, facing the stopper bolt 44a.

With the receiving rod 15 accommodated in the accommodation portion 29 of the adapter 27, the accommodation portion 29 is fitted into the elongated hole 21b of the pressure contact surface portion 21B, and the connecting portion 35 is fixed to the plate surface on the non-pressure contact side of the pressure contact surface portion 21B, so that the receiving rod 15 side is attached to the pressure contact surface portion 21B. The end face of the accommodation portion 29 is substantially flush with the abutment surface of the pressure contact plate 21B, and the corner portion 17a, which forms the opposing surface, is also substantially flush with the abutment surface of the pressure contact surface portion 21B.
As described above, one end of the bearing portion 31 is ring-shaped for insertion of the round bar portion 19, and one end of the spring 43 is connected to the other end so that the other end of the spring 43 can be appropriately hooked onto the hook portion 39a of the mounting plate 39. After the receiving rod 15 is accommodated in the accommodation portion 29, when the spring 43 is connected to the mounting plate 39, the bearing portion 31 is biased toward the mounting plate 39, and the receiving rod 15 is stably accommodated within the accommodation portion 29. The shafts 41, 41 are also biased toward the accommodation portion 29 via the mounting plate 39.

When the rod 37b is extended by driving the cylinder, its receiving portion 38 protrudes and pushes out the square bar portion 17, and the other two receiving portions 38, 38 also protrude in the direction of pushing out the square bar portion 17 via the accommodation portion 29. However, as the shaft 41 moves, the stopper 44b on the connecting plate 39 hits the stopper bolt 44a on the main body 37a, restricting further movement. Therefore, when the receiving bar 15 is pushed out, the square bar portion 17 is supported by the three receiving portions 38, ...
By this action, the receiving portions 38, 38, ... cooperate to push the receiving rod 15 in parallel out of the communicating hole 29b of the receiving portion 29. Even when pushed out to the maximum extent, as shown in the cross-sectional view of Figure 5, the height at which the corner portion 17a protrudes from the edge surface of the receiving portion 29 is small, but it protrudes to an extent sufficient for sealing and cutting.

The horizontal seal and cut unit 1 is configured as described above, and by driving the cylinder, the ultrasonic horn 13 travels back and forth while maintaining the opposing state with the corner 17a as shown in Figures 8 and 9. During the back and forth travel, the cylinder drives the corner 17a to protrude, keeping the packaging material sheet S in a taut state.
The ultrasonic horn 13 moves back and forth laterally within the lateral range of the elongated hole 29 a. The width of the cylindrical packaging sheet when it is stacked flat is shorter than the lateral dimensions of the elongated holes 29 a, 29 b. When the ultrasonic horn 13 and the receiving rods 15 face each other at both lateral ends, the ultrasonic horn 13 is positioned outward of the packaging sheet S, so that it can completely traverse the packaging sheet in the width direction.

When the ultrasonic horn 13 travels forward, it faces the corner 17a of the receiving rod 15 while maintaining a slightly tilted posture on the rear side in the direction of travel. As shown in Figure 8, when viewed from above, the perpendicular line (L) drawn from the linear tip opening 13a of the ultrasonic horn 13 to the corner 17a is such that the perpendicular line (L1) on one end side is the longest and the perpendicular line (L2) on the other end side is the shortest.
In terms of operation, during the forward travel indicated by the thick arrow, the perpendicular line (L1) side is the receiving port 45 and the perpendicular line (L2) side is the dispensing port 47.

The receiving opening 45 and the dispensing opening 47 are portions for receiving and dispensing the packaging sheet S, respectively, and are formed by the gap between the tip opening 13 a of the ultrasonic horn 13 and the corner portion 17 a.
Sealing begins when the distance between the tip opening 13a of the ultrasonic horn 13 and the opposing corner 17a becomes smaller than a certain size, and cutting occurs when the distance between the tip opening 13a of the ultrasonic horn 13 and the opposing corner 17a becomes closest.
The receiving port 45 corresponds to the distance from the sealing start position to the cutting position, extending from the perpendicular line (L1) to the perpendicular line (L2), and the dispensing port 47 remains at or near the perpendicular line (L2). By tilting the ultrasonic horn 13, a sufficient sealing distance is ensured before cutting.

During operation of the vertical bag making, filling and packaging apparatus, the horizontal sealing and cutting unit 1 operates as follows.
When the downward feeding of the cylindrical packaging sheet S is stopped, the pair of pressure contact surfaces 21A, 21B of the pressing part 21 approach each other and press down on the upper and lower sides of the opposing portions of the ultrasonic horn 13 and the corner 17a of the receiving rod 15, and the packaging sheet S exposed between the opposing elongated holes 21a, 21b is also overlapped and becomes flat and taut. After that, the receiving rod 15 housed in the elongated hole 21B is fitted into the housing part 27 of the adapter 25, and the housing part 27 is pushed out, tensioning the packaging sheet S.
In this way, the packaging sheet S is held so as to be able to be sealed and cut.

In this state, as the packaging material sheet S travels forward, as shown in Figure 10, it is fed toward the gap between the ultrasonic horn 13 and the receiving rod 15, received through the receiving port 45, and the packaging material sheet S sandwiched between the tip opening 13a of the ultrasonic horn 13 and the corner 17a is sealed and cut before being dispensed from the dispensing port 47.
Figure 11 shows an image of the packaging material sheet S being sealed and cut in the transverse direction as it is fed downward. As shown in this figure, the formation of the transverse seal Y comes first, and then the sheet is cut to form the incision K, so that the strength of the seal is ensured and the cutting is given top priority, resulting in a clean cut surface.

As the ultrasonic horn 13 moves, the opposing surfaces constituting the receiving opening 45 and the dispensing opening 47 change sequentially, and the subsequent opposing surface moves toward the sandwiching direction of the packaging sheet S and becomes the opposing surface.
This movement induces foreign objects on the opposing surface on the receiving port 45 side to jump out in the dispensing direction.

When the inner surface of the overlapping side of the packaging material sheet S is melted by ultrasonic vibration, glue residue (N) is generated as shown in Figure 10. However, since the seal strength is ensured by the above-mentioned mechanism, glue residue (N) is particularly likely to be generated on the receiving opening 45 side.
In the past, glue residue (N) would accumulate between the ultrasonic horn and the receiving roll and grow. This grown glue residue (N) would pass through between the ultrasonic horn and the receiving roll at some stage during travel and go in the opposite direction of travel, and in this case, it would easily stick to the part of the packaging material sheet S that was to be sealed, causing a seal failure in that part and a risk of a decrease in seal strength.
However, in the present invention, since the receiving rod 15 moves in the above-mentioned direction relative to the ultrasonic horn 13, the glue residue (N), which is a foreign object, cannot move and adheres to the ultrasonic horn 13, but is left at the location where it is generated. Therefore, the glue (N) does not grow and does not move in the opposite direction of movement.
Therefore, although the generation of glue residue (N) cannot be prevented, the occurrence of sealing defects due to the generation of glue residue (N) can be prevented.

Therefore, if the packaging sheet S is sealed and cut by the horizontal sealing and cutting unit 1 of the present invention, an appropriate seal strength can be stably ensured and at the same time, a clean cut surface can be obtained.
In this horizontal seal and cut unit 1, the characteristic opposing state between the ultrasonic horn 13 and the receiving rod 15 is available only during outward travel. Even during return travel, the opposing state between the ultrasonic horn 13 and the receiving rod 15 is maintained, but at the end of the outward travel, the holding by the pressing portion 21 is released, and the seal and cut that occurs during outward travel is not performed.

When the packaging sheet S reaches the standby position after reciprocating travel, i.e., when the ultrasonic horn 13 faces the corner 17a at one end of the elongated hole 29a, the ultrasonic horn 13 faces the corner 17a so that it can be sealed and cut, but the downward feeding does not interfere.

With the conventional backing roll system, the backing roll also moves, and vibrations that inevitably occur as the roll moves can be transmitted to unexpected locations on the vertical form-fill-seal-seal machine. However, the backing rod 15 can be made part of the rigid structure during the seal and cut process, suppressing vibrations. Furthermore, the overall structure is simplified, making maintenance easier.
Furthermore, the receiving rod 15 has a plurality of corners 17a, and as wear progresses, the corners 17a that serve as opposing surfaces can be changed, thereby reducing the frequency with which the receiving rod 15 itself needs to be replaced.

Although the embodiments of the present invention have been described in detail above, the specific configuration is not limited to these embodiments, and the invention also includes design changes within the scope of the present invention without departing from the gist of the present invention.
For example, the present invention relates to an ultrasonic seal and cut unit, and in the above embodiment it was incorporated into a vertical bag making, filling and packaging apparatus as a horizontal seal and cut unit 1, but it is not limited to use as a single unit of the bag making, filling and packaging apparatus.
Furthermore, the tilt angle of the ultrasonic horn 13 is not constant, but is optimally adjusted taking into consideration the material of the packaging sheet S, etc., and based on the idea of the present invention, this adjustment can be made appropriately by a person skilled in the art.
Furthermore, the square bar portion 17 of the receiving bar 15 may have any cross section as long as it has a square cross section, and is not limited to a square.

DESCRIPTION OF SYMBOLS 1...Horizontal seal and cut unit 3A, B...Unit wall 4...Mounting plate 5A, B...Guide shaft 7A, B...Sliding block 9...Connecting plate 11...Cylinder type linear motion mechanism 11a...Main body 13...Ultrasonic horn 13a...Tip opening 14...Guide 15...Receiving rod 17...Square rod portion 17a...Corner portion
19...Round bar portion 21...Pressing portion 21A, B...Pressure contact surface portion 21a, b...Slotted hole 23...Cylinder type linear motion mechanism 23a...Main body 23b...Rod 25...Link mechanism 27...Adapter 29...Storage portion 29a...Concave inner surface 29b...Communicating hole 31...Bearing portion 33...Guide 35...Connecting portion 35a...Both ends 35b...Middle portion 35c...Screw head storage portion 37...Cylinder type linear motion mechanism 37a...Main body 37b...Rod 38...Receiving portion 39...Mounting plate 39a...Hook portion 41...Shaft 42...Guide tube 43...Spring 44a...Stopper bolt 44b...Stopper
45... Receiving port 47... Discharge port L1, L2... Perpendicular lines Y... Horizontal seal section K... Notch N... Glue residue

Claims (4)

The ultrasonic horn and receiving rod are provided, and the ultrasonic horn moves while facing the linearly continuous facing surface of the receiving rod so as to be able to seal and cut. The packaging material sheet that has been flatly stacked between the facing surface of the ultrasonic horn and the receiving rod is received from the forward side in the direction of movement, and is subjected to sealing and cutting, and then the packaging material sheet is discharged, thereby sealing and cutting the packaging material sheet .
The ultrasonic horn is a sealing and cutting unit for a packaging material sheet that performs sealing and cutting while moving while maintaining a posture of being tilted backward in the moving direction ,
The presser section holds the packaging material sheets, which are overlapped flat between the pair of pressure contact surfaces, in a stationary and taut state,
The receiving rod is detachably attached to one of the pressure contact surfaces via an adapter, and its opposing surface is configured to be able to move from one of the pressure contact surfaces toward the other of the pressure contact surfaces, and is fixed to one of the pressure contact surfaces so as not to move during sealing and cutting.
The seal and cut unit is characterized in that the receiving rod is composed of a square rod with a polygonal cross section, and multiple corners are opposing surfaces, and the multiple opposing surfaces can be used by changing the attachment angle of the receiving rod relative to the adapter . 2. The packaging sheet seal and cut unit according to claim 1,
A seal and cut unit characterized in that the ultrasonic horn is coaxially cylindrical and the tip opening is cylindrical . 3. The packaging sheet seal and cut unit according to claim 2,
A seal and cut unit characterized in that it is provided as a horizontal seal and cut unit. The packaging sheet seal and cut unit according to any one of claims 1 to 3 ,
A seal and cut unit characterized in that it is provided as a horizontal seal and cut unit in a vertical bag making, filling and packaging apparatus .